This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) This article may require cleanup to meet Wikipedia's quality standards. The specific problem is: trim down. Please help improve this article if you can. (November 2022) (Learn how and when to remove this template message) This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: "Phone connector" audio – news · newspapers · books · scholar · JSTOR (November 2022) (Learn how and when to remove this template message) This article possibly contains original research. Please improve it by verifying the claims made and adding inline citations. Statements consisting only of original research should be removed. (November 2022) (Learn how and when to remove this template message) Some of this article's listed sources may not be reliable. Please help this article by looking for better, more reliable sources. Unreliable citations may be challenged or deleted. (November 2022) (Learn how and when to remove this template message) (Learn how and when to remove this template message)

A 6.35 mm (14 inch) two-contact phone plug used for various signals including electric guitar, loudspeaker, microphone and line-level audio. The tip is insulated from its adjacent sleeve and body.
TRS connectors have three parts: tip, ring and sleeve
A pair of phone connectors: A plug (right) is inserted in a socket (jack, left). Note the flat open contact spring parallel to and inside the tip contact spring. When the plug is removed, those contacts close to connect a circuit; such a connection is said to be "normal". Inserting the plug connects its tip to one part of that circuit instead.

A phone connector, also known as phone jack, audio jack, headphone jack or jack plug, is a family of electrical connectors typically used for analog audio signals. A plug, the "male" connector, is inserted into the jack, the "female" connector.

The phone connector was invented for use in telephone switchboards in the 19th century and is still widely used.

The phone connector is cylindrical in shape, with a grooved tip to retain it. In its original audio configuration, it typically has two, three, four or, occasionally, five contacts. Three-contact versions are known as TRS connectors (tip, ring, sleeve). Ring contacts are typically the same diameter as the sleeve, the long shank. Similarly, two-, four- and five-contact versions are called TS, TRRS and TRRRS connectors respectively. The outside diameter of the "sleeve" conductor is 6.35 millimetres (14 inch). The "mini" connector has a diameter of 3.5 mm (0.14 in) and the "sub-mini" connector has a diameter of 2.5 mm (0.098 in). The "mini" connector has a length of 14 millimetres (0.55 in).

Other terms

Specific models, and connectors used in specific applications, may be termed e.g. stereo plug, headphone jack, microphone jack, aux input, etc. The 3.5 mm versions are mini-phone, mini-stereo, mini jack, etc.[1][failed verification]

In the UK, jack plug and jack socket are the male and female phone connectors.[2] In the US, a stationary (more fixed) electrical connector is the jack.[3][4] The terms phone plug and phone jack sometimes refer to different genders of phone connectors,[5] but also sometimes refer to the RJ11 and older telephone plugs and corresponding jacks that connect wired telephones to wall outlets.

Phone plugs and jacks are different from phono plugs and phono jacks (or in the UK, phono socket) which are RCA connectors common in consumer hi-fi and audiovisual equipment. The 3.5 mm connector is, however, sometimes—but counter to the connector manufacturers' nomenclature[6]—referred to as mini phono.[7]

Historical development

Phone connectors:
  • 2.5 mm (110 in) mono (TS)
  • 3.5 mm (18 in) mono (TS)
  • 3.5 mm (18 in) stereo (TRS)
  • 6.35 mm (14 in) stereo (TRS)

Quarter-inch size

Modern phone connectors are available in three standard sizes. The original 14 inch (6.35 mm) version descends from as early as 1877, when the first-ever telephone switchboard was installed at 109 Court Street in Boston in a building owned by Charles Williams, Jr.;[8] or 1878, when an early switchboard was used for the first commercial manual telephone exchange[9][10] in New Haven, Connecticut created by George W. Coy.[11][12] The 1877 switchboard was last known to be located in the lobby of 185 Franklin Street, Boston.[8]

In February 1884, C. E. Scribner was issued US Patent 293,198[13] for a "jack-knife" connector that is the origin of calling the receptacle a "jack".[14] Scribner was issued U.S. Patents 262,701,[13] 305,021,[15] and 489,570 relating to an improved design that more closely resembles the modern plug.[16] The current form of the switchboard-plug was patented prior to 1902, when Henry P. Clausen received a patent on an improved design.[17] It is today still used on mainstream musical equipment, especially on electric guitars.

Western Electric was the manufacturing arm of the Bell System, and thus originated or refined most of the engineering designs, including the telephone jacks and plugs which were later adopted by other industries, including the U.S. military.

By 1907, Western Electric had designed a number of models for different purposes, including:[18]

By 1950, the two main plug designs were:

Several modern designs have descended from those earlier versions:

Military variants

U.S. military versions of the Western Electric plugs were initially specified in Amendment No.1, MIL-P-642, and included:

Miniature size

The 3.5 mm or miniature size was originally designed in the 1950s as two-conductor connectors for earpieces on transistor radios, and remains a standard still used today.[21] This roughly half-sized version of the original, popularized by the Sony EFM-117J radio (released in 1964),[22][23][failed verification] is still commonly used in portable applications. The three-conductor version became very popular with its application on the Walkman in 1979, as unlike earlier transistor radios, these devices had no speaker of their own; the usual way to listen to them was to plug in headphones. There is also an EIA standard for 0.141-inch miniature phone jacks.

The 2.5 mm or sub-miniature sizes were similarly popularized on small portable electronics. They often appeared next to a 3.5 mm microphone jack for a remote control on-off switch on early portable tape recorders; the microphone provided with such machines had the on-off switch and used a two-pronged connector with both the 3.5 and 2.5 mm plugs. They were also used for low-voltage DC power input from wall adapters. In the latter role they were soon replaced by coaxial DC power connectors. 2.5 mm phone jacks have also been used as the headset jacks on mobile telephones (see § PDAs and mobile phones).

The 3.5 mm and 2.5 mm sizes are sometimes called 18 in and 332 in respectively in the United States, though those dimensions are only approximations.[24] All sizes are now readily available in two-conductor (unbalanced mono) and three-conductor (balanced mono or unbalanced stereo) versions.

Four-conductor versions of the 3.5 mm plug and jack are used for certain applications. A four-conductor version is often used in compact camcorders and portable media players, providing stereo sound and composite analog video. It is also used for a combination of stereo audio, a microphone, and controlling media playback, calls, volume and/or a virtual assistant on some laptop computers and most mobile phones,[25] and some handheld amateur radio transceivers from Yaesu.[26] Some headphone amplifiers have used it to connect "balanced" stereo headphones, which require two conductors per audio channel as the channels do not share a common ground.[27]

Broadcast usage

By the 1940s, broadcast radio stations were using Western Electric Code No. 103 plugs and matching jacks for patching audio throughout studios. This connector was used because of its use in AT&T's Long Line circuits for distribution of audio programs over the radio networks' leased telephone lines.[citation needed] Because of the large amount of space these patch panels required, the industry began switching to 3-conductor plugs and jacks in the late 1940s, using the WE Type 291 plug with WE type 239 jacks. The type 291 plug was used instead of the standard type 110 switchboard plug because the location of the large bulb shape on this TRS plug would have resulted in both audio signal connections being shorted together for a brief moment while the plug is being inserted and removed. The Type 291 plug avoids this by having a shorter tip.[28][page needed]

Patch bay connectors

Professional audio and the telecommunication industry use a 0.173 in (4.4 mm) diameter plug, associated with trademarked names including Bantam, TT, Tini-Telephone, and Tini-Tel. They are not compatible with standard EIA RS-453/IEC 60603-11 1/4-inch jacks. In addition to a slightly smaller diameter, they have a slightly different geometry.[29] The three-conductor TRS versions are capable of handling balanced line signals and are used in professional audio installations. Though unable to handle as much power, and less reliable than a 6.35 mm (0.250 in) jack,[30] Bantam connectors are used for mixing console and outboard patchbays in recording studio and live sound applications, where large numbers of patch points are needed in a limited space.[29] The slightly different shape of Bantam plugs is also less likely to cause shorting as they are plugged in.[citation needed]

Less common

A dual 310 patch cable, two-pin phone plug

A two-pin version, known to the telecom industry as a "310 connector", consists of two 14-inch phone plugs at a centre spacing of 58 inch (16 mm). The socket versions of these can be used with normal phone plugs provided the plug bodies are not too large, but the plug version will only mate with two sockets at 58 inches centre spacing, or with line sockets, again with sufficiently small bodies. These connectors are still used today in telephone company central offices on "DSX" patch panels for DS1 circuits. A similar type of 3.5 mm connector is often used in the armrests of older aircraft, as part of the on-board in-flight entertainment system. Plugging a stereo plug into one of the two mono jacks typically results in the audio coming into only one ear. Adapters are available.

A short-barrelled version of the phone plug was used for 20th century high-impedance mono headphones, and in particular those used in World War II aircraft. These have become rare. It is physically possible to use a normal plug in a short socket, but a short plug will neither lock into a normal socket nor complete the tip circuit.

Less commonly used sizes, both diameters and lengths, are also available from some manufacturers, and are used when it is desired to restrict the availability of matching connectors, such as 0.210-inch (5.3 mm) inside diameter jacks for fire safety communication in public buildings.[a]

Aviation and US military connectors

Further information: List of aviation headset connectors

The US military uses a variety of phone connectors including 932-inch (0.281 inch, 7.14 mm) and 14-inch (0.25 inch, 6.35 mm) diameter plugs.[32]

Commercial and general aviation (GA) civil aircraft headsets often use a pair of phone connectors. A standard 14-inch (6.3 mm) 2 or 3-conductor plug, type PJ-055, is used for headphones. For the microphone, a smaller 316-inch (0.206 inch / 5.23 mm) diameter 3-conductor plug, type PJ-068, is used.

Aviation plug type U-174/U or Nexus TP120, commonly used on military aircraft and civil helicopters

Military aircraft and civil helicopters have another type termed the U-174/U (Nexus TP-101),[33] also known as U-93A/U (Nexus TP-102)[34] and Nexus TP-120.[35] These are also known as US NATO plugs. These have a 0.281 in (7.1 mm) diameter shaft with four conductors, allowing two for the headphones, and two for the microphone. Also used is the U-384/U (Nexus TP-105), which has the same diameter as the U-174/U but is slightly longer and has 5 conductors instead of 4.[36][37]

There is a confusingly similar four-conductor British connector, Type 671 (10H/18575), with a slightly larger diameter of 7.57 mm (0.298 in)[38] used for headsets in many UK military aircraft and often referred to as a UK NATO or European NATO connector.[39]

Mono and stereo compatibility

Old-style male tip-sleeve connectors. The leftmost plug has three conductors; the others have two. At the top is a three-conductor panel jack.
Modern profile 2-conductor male 14 in TS connectors

The original application for the 6.35 mm (14 in) phone jack was in manual telephone exchanges.[40] Many different configurations of these phone plugs were used, some accommodating five or more conductors, with several tip profiles. Of these many varieties, only the two-conductor version with a rounded tip profile was compatible between different manufacturers, and this was the design that was at first adopted for use with microphones, electric guitars, headphones, loudspeakers, and other audio equipment.

When a three-conductor version of the 6.35 mm plug was introduced for use with stereo headphones, it was given a sharper tip profile in order to make it possible to manufacture jacks that would accept only stereo plugs, to avoid short-circuiting the right channel of the amplifier. This attempt has long been abandoned, and now the convention is that all plugs fit all sockets of the same size, regardless of whether they are balanced or unbalanced, mono or stereo. Most 6.35 mm plugs, mono or stereo, now have the profile of the original stereo plug, although a few rounded mono plugs are still produced. The profiles of stereo miniature and sub-miniature plugs have always been identical to the mono plugs of the same size.

The results of this physical compatibility are:

Because of a lack of standardization in the past regarding the dimensions (length) given to the ring conductor and the insulating portions on either side of it in 6.35 mm (14 in) phone connectors and the width of the conductors in different brands and generations of sockets, there are occasional issues with compatibility between differing brands of plug and socket. This can result in a contact in the socket bridging (shorting) the ring and sleeve contacts on a phone connector.

General use

A 3.5 mm phone connector
A 3.5 mm 4-conductor TRRS phone connector
A 3.5 mm 5-conductor TRRRS phone connector

In the most common arrangement, consistent with the original intention of the design, the male plug is connected to a cable, and the female socket is mounted in a piece of equipment. A considerable variety of line plugs and panel sockets is available, including plugs suiting various cable sizes, right-angle plugs, and both plugs and sockets in a variety of price ranges and with current capacities up to 15 amperes for certain heavy-duty 14 in versions intended for loudspeaker connections.[41]

Common uses of phone plugs and their matching sockets include:

Computer sound

See also: Intel High Definition Audio and AC'97

3.5 mm jacks for microphone, audio out, and line-level audio in
A 3.5 mm plug for computer audio
A 3.5 mm headphone socket (TRS) on a computer

Personal computer sound cards, such as Creative Labs' Sound Blaster line, use a 3.5 mm phone connector as a mono microphone input, and deliver a 5 V bias voltage on the ring to power the FET preamplifier built into electret microphones. Adjustments may be required to achieve compatibility between different manufacturers.[42]

The Apple PlainTalk microphone jack used on some older Macintosh systems is designed to accept an extended 3.5 mm three-conductor phone connector; in this case, the tip carries power for a preamplifier inside the microphone. It cannot accept a standard microphone without a preamp. If a PlainTalk-compatible microphone is not available, the jack can accept a line-level sound input.

Normally, 3.5 mm three-conductor sockets are used in computer sound cards for stereo output. Thus, for a sound card with 5.1 output, there will be three sockets to accommodate six channels: front left and right; surround left and right; and center and subwoofer. 6.1 and 7.1 channel sound cards from Creative Labs, however, use a single three-conductor socket (for the front speakers) and two four-conductor sockets.[b] This is to accommodate rear-center (6.1) or rear left and right (7.1) channels without the need for additional sockets on the sound card.

Some portable computers have a combined 3.5 mm TRS-TOSLINK jack, supporting stereo audio output using a TRS connector, or TOSLINK (stereo or 5.1 Dolby Digital/DTS) digital output using a suitable optical adapter. Most iMac computers have this digital/analog combo output feature as standard, with early MacBooks having two ports, one for analog/digital audio input and other for output. Support for input was dropped on various later models[43][44]

Some newer computers, such as Lenovo laptops, have 3.5 mm TRRS headset sockets, which are compatible with phone headsets and may be distinguished by a headset icon instead of the usual headphones or microphone icons. These are particularly used for voice over IP.


Different length 3.5 mm TRRS connectors

Equipment requiring video with stereo audio input or output sometimes uses 3.5 mm TRRS connectors. Two incompatible variants exist, of 15 millimetres (0.59 in) and 17 mm (0.67 in) length, and using the wrong variant may either simply not work, or could cause physical damage.

Attempting to fully insert the longer (17 mm) plug into a receptacle designed for the shorter (15 mm) plug may damage the receptacle, and may damage any electronics located immediately behind the receptacle. However, partially inserting the plug will work as the tip/ring/ring distances are the same for both variants.

A shorter plug in a socket designed for the longer connector may not be retained firmly and may result in wrong signal routing or a short circuit inside the equipment (e.g. the plug tip may cause the contacts inside the receptacle – tip/ring 1, etc. - to short together).

The shorter 15 mm TRRS variant is more common and physically compatible with standard 3.5 mm TRS and TS connectors.

Recording equipment

Stereo devices which use "plug-in power": the electret capsules are wired in this way.

Many small video cameras, laptops, recorders and other consumer devices use a 3.5 mm microphone connector for attaching a microphone to the system. These fall into three categories:[citation needed]

PDAs and mobile phones

All iPhone models from the first generation to the 6S and SE (first generation) use a four-conductor (TRRS) phone connector (center) for a wired headset.

Three- or four-conductor (TRS or TRRS) 2.5 mm and 3.5 mm sockets are common on older cell phones and newer smartphones respectively, providing mono (three conductor) or stereo (four conductor) sound and a microphone input, together with signaling (e.g., push a button to answer a call). These are used both for handsfree headsets and for stereo headphones.

3.5 mm TRRS (stereo-plus-mic) sockets became particularly common on smartphones, and have been used by Nokia and others since 2006. These sockets are often compatible with standard 3.5 mm stereo headphones. Many computers, especially laptops, also include a TRRS headset socket compatible with the headsets intended for smartphones.

The four conductors of a TRRS connector are assigned to different purposes by different manufacturers. Any 3.5 mm plug can be plugged mechanically into any socket, but many combinations are electrically incompatible. For example, plugging TRRS headphones into a TRS headset socket, TRS headset into a TRRS socket, or plugging TRRS headphones from one manufacturer into a TRRS socket from another may not function correctly, or at all. Mono audio will usually work, but stereo audio or the microphone may not work, or the pause/play controls may be inactive, as is common when trying to use headphones with controls for iPhones on an Android device, or vice versa.

TRRS standards

Two different forms are frequently found, both of which place left audio on the tip and right audio on the first ring (for compatibility with stereo connectors). Where they differ is in the placement of the microphone and return contacts.

The first, which places the ground return on the sleeve and the microphone on the second ring, is standardized in OMTP[45] and has been accepted as a national Chinese standard YDT 1885–2009. It is mostly used on older devices, such as older Nokia mobiles, older Samsung smartphones, and some Sony Ericsson phones,[46] and products meant for the Chinese market.[47][48] Headsets using this wiring may be indicated by black plastic separators between the rings.[49][48]

The second, which reverses these contacts, with the microphone on the sleeve, is used by Apple's iPhone line until the 6S and SE (1st), and has become the de facto TRRS standard, to maintain compatibility with these products.[50][51][52] It is now used by HTC devices, recent Samsung, Nokia, and Sony phones, among others. This is referred to as CTIA/AHJ, and has the disadvantage that the mic will be shorted to ground if the body of the device is metal, and the sleeve has a flange that contacts it. Headsets using this wiring may be indicated by white plastic separators between the rings.[49][48]

If a CTIA headset is connected to a mobile phone with OMTP interface, the missing ground will effectively connect speakers in out-of-phase series, resulting in no voice on typical popular music recordings where the singers are in the center; in this case, if the main microphone button is held down, shorting across the microphone and restoring ground, the correct sound may be audible.[48]

Standard Tip Ring 1 Ring 2 Sleeve Devices using this standard
CTIA, AHJ Left audio Right audio Ground Microphone Most Android devices.[53] Apple, HTC, LG, BlackBerry, latest Nokia (including 1st generation Lumia as well as later models[clarification needed]), latest Samsung, Jolla, Microsoft (including Surface, and Xbox One controller), Sony Playstation 4 (DualShock 4[54]), Google Pixel 4a, Librem 5
CTIA-style AV[55] Left audio Right audio Ground CVBS video Apple iPod (up to 6th generation), Raspberry Pi (2014 onwards), Xbox 360 E, Zune (defunct), some older mobile phones (including Nokia N93, Nokia N95,[56] Samsung Galaxy S GT-I9000,[57] T-Mobile Sidekick 4G)
OMTP Left audio Right audio Microphone Ground Old Nokia and also Lumia starting from the 2nd generation),[58] old Samsung (2012 Chromebooks), some old Sony Ericsson smartphones (2010 and 2011 Xperias),[59] Sony (PlayStation Vita), OnePlus One.
OMTP-style radios Speaker Clone Microphone / PTT Ground Yaesu FT-60R amateur radio hand-held.[60][61][62]
Video/audio 1 Left audio CVBS video Ground Right audio Sony and Panasonic camcorders. On some early Sony camcorders, this socket doubled up as a headphone socket. When a headphone plug was inserted, ring 2 was shorted to the sleeve contact and the camcorder output the right audio on ring 1.[63]
Video/audio 2 CVBS video Left audio Right audio Ground Unknown camcorders, portable VCD and DVD players, Western Digital TV live!, some newer LG TVs.
Video/audio 3 CVBS video Left audio Ground Right audio Toshiba TVs
Video/audio 4 Left audio Right audio CVBS video Ground Grandstream GXV-3500[64]

The 4-pole 3.5 mm connector is defined by the Japanese standard JEITA/EIAJ RC-5325A, "4-Pole miniature concentric plugs and jacks", originally published in 1993.[65] 3-pole 3.5 mm TRS connectors are defined in JIS C 6560. See also JIS C 5401 and IEC 60130-8.


The USB Type-C Cable and Connector Specification specifies a mapping from a USB-C jack to a 4-pole TRRS jack, for the use of headsets, and supports both CTIA and OMTP (YD/T 1885–2009) modes.[66] Some devices transparently handle many jack standards,[67][68] and there are hardware implementations of this available as components.[69] This is accomplished in some cases by applying a voltage to the sleeve and second ring to detect the wiring. The last two conductors may then be switched to allow a device made to one standard to be used with a headset made to the other.[70]

TRRRS standards

A TRRRS standard for 3.5 mm connectors was developed by ITU-T.[71] The standard, called P.382 (formerly P.MMIC), outlines technical requirements and test methods for a 5-conductor socket and plug configuration. Compared to the TRRS standard, TRRRS provides one extra conductor that can be used for connecting a second microphone or providing power to or from the audio accessory.

P.382 requires compliant sockets and plugs to be backward compatible with legacy TRRS and TRS connectors. Therefore, P.382-compliant TRRRS connectors should allow for seamless integration when used on new products. TRRRS connectors enable the following audio applications: active noise canceling, binaural recording and others, where dual analog microphone lines can be directly connected to a host device. It was commonly found on Sony phones starting with the Xperia Z1-XZ1 and Xperia 1 II.

Another TRRRS standard for 4.4 mm connectors following JEITA RC-8141C was introduced in 2015 and is used for balanced audio connections, in particular for headphone cables. This connector is often called a Pentaconn connector following the brand name of Nippon DICS (NDICS). It is used by some Sony products like the M1Z Walkman of their Signature series and by some Sennheiser products like the HD 820 headphone or the HDC 820 DAC headphone amplifier.[72][73]

Switch contacts

This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. (August 2007) (Learn how and when to remove this template message)
Miniature phone plugs and jacks. All are 3.5 mm except the gold-plated plug, which is 2.5 mm. One of the 3.5 mm jacks is two-conductor and the others are three conductor. In this collection the tan-colored jacks have normally-closed switches.

Panel-mounted jacks may include switch contacts. Most commonly, a mono jack is provided with one normally closed (NC) contact, which is connected to the tip (live) connection when no plug is in the socket, and disconnected when a plug is inserted. Stereo sockets commonly provide two such NC contacts, one for the tip (left channel) and one for the ring or collar (right channel). Some jacks also have such a connection on the sleeve. As this contact is usually ground, it is not much use for signal switching, but could be used to indicate to electronic circuitry that the jack is in use. Less commonly, jacks may feature normally open (NO) or change-over contacts or the switch contacts may be isolated from the connector signals.

The original purpose of these contacts was for switching in telephone exchanges, for which there were many patterns. Two sets of change-over contacts, isolated from the connector contacts, were common. The more recent pattern of one NC contact for each signal path, internally attached to the connector contact, stems from their use as headphone jacks. In many amplifiers and equipment containing them, such as electronic organs, a headphone jack is provided that disconnects the loudspeakers when in use. This is done by means of these switch contacts. In other equipment, a dummy load is provided when the headphones are not connected. This is also easily provided by means of these NC contacts.

Other uses for these contacts have been found. One is to interrupt a signal path in a mixing console to insert an effects processor. This is accomplished by using one NC contact of a stereo jack to connect the tip and ring together to affect a bypass when no plug is inserted. A similar arrangement is used in patch panels for normalization (see Patch panel § Normalization).

Where a 3.5 mm or 2.5 mm jack is used as a DC power inlet connector, a switch contact may be used to disconnect an internal battery whenever an external power supply is connected, to prevent incorrect recharging of the battery.

To eliminate the need for a separate power switch, a standard stereo jack is used on most battery-powered guitar effects pedals. The internal battery has its negative terminal wired to the sleeve contact of the jack. When the user plugs in a two-conductor (mono) plug, the resulting short circuit between sleeve and ring connects an internal battery to the unit's circuitry, ensuring that it powers up or down automatically whenever a signal lead is inserted or removed.


Examples of jack configurations, oriented so the plug enters from the right. The most common circuit configurations are the simple mono and stereo jacks (A and B); however there are a great number of variants manufactured.[74]
  1. A two-conductor TS phone connector. The connection to the sleeve is the rectangle towards the right, and the connection to the tip is the line with the notch. Wiring connections are illustrated as white circles.
  2. A three-conductor TRS phone connector. The upper connector is the tip, as it is farther away from the sleeve. The sleeve is shown connected directly to the chassis, a typical configuration for a balanced connection. Some jacks use plastic, to isolate the sleeve from the chassis, and provide a separate sleeve connection point, as in A.
  3. This three-conductor jack has two isolated SPDT switches activated by a plug going into the jack, which disconnects one throw and connects the other. The white arrowheads indicate a mechanical connection, while the black arrowheads indicate an electrical connection. This configuration is useful for a device that turns on when a plug is inserted, and off otherwise, with the power routed through the switches.
  4. This three-conductor jack has two normally closed switches connected to the contacts themselves. This is useful for patch panel normalization. Aother common use is as stereo headphone jack that shuts off the default output (speakers) when the connector is plugged in.
  1. Sleeve: Usually ground
  2. Ring: Right-hand channel for stereo signals, negative polarity for balanced mono signals, power supply for power-using mono signal sources
  3. Tip: Left-hand channel for stereo signals, positive polarity for balanced mono signals, signal line for unbalanced mono signals
  4. Insulating rings

The connector assembly is usually made by one or more hollow and one solid pin. The jack is then assembled with pins separated by an insulating material.

Connectors that are tarnished, or that were not manufactured within tight tolerances, are prone to cause poor connections.[75] Depending upon the surface material of the connectors, tarnished ones can be cleaned with a burnishing agent (for solid brass contacts typical) or contact cleaner (for plated contacts).[75]

Audio signals

Pin Unbalanced mono Balanced mono
in/out (simplex)[76][A][B]
In/out (simplex) Insert[80]
Tip Signal Send or return signal Positive, hot Left channel
Ring Ground, or no connection Return or send signal Negative, cold Right channel
Sleeve Ground[C]
  1. ^ The first version of the popular Mackie 1604 mixer, the CR1604, used a tip negative, ring positive jack wiring scheme on the main left and right outputs.[77][78]
  2. ^ Early QSC amplifiers used a tip negative, ring positive input wiring scheme.[79]
  3. ^ Whirlwind Line Balancer/Splitters do not use the sleeve as a conductor on their unbalanced 6.35 mm/14 in TRS phone input. Tip and ring are wired to the transformer's two terminals; the sleeve is not connected.[81]

Balanced audio

When a phone connector is used to make a balanced connection, the two active conductors are used for differential versions of a monaural signal. The ring, used for the right channel in stereo systems, is used instead for the inverting input.


Where space is a premium, TRS connectors offer a more compact alternative to XLR connectors, and so are common in small audio mixing desks.

Another advantage offered by TRS connectors used for balanced microphone inputs is that a standard unbalanced signal lead using a TS phone jack can simply be plugged into such an input. The inverting input on the ring contact gets correctly grounded when it makes contact with the plug body.

The Sony Walkman NW-ZX300 has a balanced 4.4 mm Pentaconn output alongside a standard 3.5 mm unbalanced output.


When using non-switching phone connectors to make balanced audio connections, the socket grounds the plug tip and ring when inserting or disconnecting the plug, and the ground mates last. This causes bursts of hum, cracks and pops and may stress some outputs as they will be short circuited briefly, or longer if the plug is left half in.

This problem does not occur when using the 'gauge B' (BPO) phone connector (PO 316)[82] which although it is of 0.25 in (6.35 mm) diameter has a smaller tip and a recessed ring so that the ground contact of the socket never touches the tip or ring of the plug. This type was designed for balanced audio use, being the original telephone 'switchboard' connector and is still common in broadcast, telecommunications and many professional audio applications where it is vital that permanent circuits being monitored (bridged) are not interrupted by the insertion or removal of connectors. This same tapered shape used in the 'gauge B' (BPO) plug can be seen also in aviation and military applications on various diameters of jack connector including the PJ-068 and 'bantam' plugs. The more common straight-sided profile used in domestic and commercial applications and discussed in most of this article is known as 'gauge A'.

Alternatively, some switched audio jacks contain built-in isolated switches that only activate when the plug is fully inserted.[83] This can be used to avoid the insertion issue, for instance by wiring the connectors through a double pole double throw switch that activates only upon full insertion. Or for instance by having the switch control a circuit that gracefully ramps up the audio once the plug is fully-inserted and mutes the audio when not fully-inserted.

XLR connectors used in much professional audio equipment mate the ground signal on pin 1 first, which also avoids this issue.

Unbalanced audio

Phone connectors with three conductors are also commonly used as unbalanced audio patch points (or insert points, or simply inserts), with the output on many mixers found on the tip (left channel) and the input on the ring (right channel). This is often expressed as "tip send, ring return". Other mixers have unbalanced insert points with "ring send, tip return".

One advantage of this system is that the switch contact within the panel socket, originally designed for other purposes, can be used to close the circuit when the patch point is not in use. An advantage of the tip send patch point is that if it is used as an output only, a 2-conductor mono phone plug correctly grounds the input. In the same fashion, use of a "tip return" insert style allows a mono phone plug to bring an unbalanced signal directly into the circuit, though in this case the output must be robust enough to withstand being grounded. Combining send and return functions via single 14 in TRS connectors in this way is seen in very many professional and semi-professional audio mixing desks, because it halves the space needed for insert jack fields which would otherwise need two jacks, one for send and one for return. The tradeoff is that unbalanced signals are more prone to buzz, hum and outside interference.

In some three-conductor TRS phone inserts, the concept is extended by using specially designed phone jacks that will accept a mono phone plug partly inserted to the first click and will then connect the tip to the signal path without breaking it. Most standard phone connectors can also be used in this way with varying success, but neither the switch contact nor the tip contact can be relied upon unless the internal contacts have been designed with extra strength for holding the plug tip in place. Even with stronger contacts, an accidental mechanical movement of the inserted plug can interrupt signal within the circuit. For maximum reliability, any usage involving first click or half-click positions will instead rewire the plug to short tip and ring together and then insert this modified plug all the way into the jack.

The TRS tip return, ring send unbalanced insert configuration is mostly found on older mixers. This allowed for the insert jack to serve as a standard-wired mono line input that would bypass the mic preamp. However tip send has become the generally accepted standard for mixer inserts since the early-to-mid 1990s. The TRS ring send configuration is still found on some compressor sidechain input jacks such as the dbx 166XL.[84]

In some very compact equipment, 3.5 mm TRS phone connectors are used as patch points.

Some sound recording devices use a three-conductor phone connector as a mono microphone input, using the tip as the signal path and the ring to connect a standby switch on the microphone.

See also

Explanatory notes

  1. ^ 0.210 inch inside diameter jacks are also found in discontinued Bell & Howell 16 mm projector speakers.[31]
  2. ^ Creative's documentation uses the word pole instead of conductor to describe connector contacts.


  1. ^ International Library of Technology: ... Principles of Telephony ... International Textbook Company, Scranton, PA. 1907. p. 36. tip ring sleeve 0-1922.
  2. ^ Robert McLeish (2005). Radio Production. Newnes. ISBN 0-240-51972-8.
  3. ^ Standard Reference Designations for Electrical and Electronics Parts and Equipments: IEEE 200-1975 (Reaffirmed 1988): Section IEEE and ANSI, New York, NY. 1975.
  4. ^ Reference Designations for Electrical and Electronics Parts and Equipment: ASME Y14.44-2008 (Replaced IEEE 200-1975): Section ASME, Fairfield, NJ. 2008. Archived from the original on 2010-03-13.
  5. ^ Gary D. Davis and Ralph Jones (1989). The Sound Reinforcement Handbook. Hal Leonard. ISBN 0-88188-900-8.
  6. ^
  7. ^
  8. ^ a b "The Birthplace of the Telephone | Thomas Sherwin Chapter #14".
  9. ^ "When Phone Operators Were Unruly Teenage Boys". The Atlantic. 19 September 2014. Retrieved 2017-10-25.
  10. ^ "Chapter 3 Local Manual Systems" (PDF).
  11. ^ "First Commercial Telephone Exchange – Today in History: January 28". 28 January 2020.
  12. ^ "A History of the Telephone".
  13. ^ a b "Patent Public Search | USPTO".
  14. ^ Chapuis, Robert J. (2003). 100 Years of Telephone Switching. Amsterdam, the Netherlands: IOS Press. p. 51. ISBN 9784274906114.
  15. ^ "U.S. Patent 305,021, September 1884".
  16. ^ Scribner, C. E. "U.S. Patent 489,570: Spring Jack Switch".
  17. ^ "Telephone switchboard-plug".
  18. ^ "Western Electric Telephonic Apparatus and Supplies (1907)".
  19. ^ "MIL-DTL-642/5B". 3 March 2021.
  20. ^ "MIL-DTL-642F: Plugs, Telephone, and Accessory Screws" (PDF).
  21. ^ "All-right jack: Simple but effective plug-in has endured for more than a century". Retrieved 2016-09-11.
  22. ^ "Sony history 1960s". Sony official website.
  23. ^ Description of 3.5 mm earphone jack in described model: "Vintage Sony 1960'S EFM-117J Radio". WorthPoint. Retrieved 2016-01-25.
  24. ^ 3.5 mm Stereo Plug, CUI Devices, retrieved 2021-09-01
  25. ^ "3.5 mm Headset: Accessory Specification". Android Open Source Project. Retrieved 2019-06-15.
  26. ^ "Build a Data Cable for the Yaesu VX-6".
  27. ^ "Geek Out V2+ User Manual".
  28. ^ Chinn, Howard (July 1947). "Single Jacks for Broadcast Application" (PDF). Audio Engineering. 31 (6).
  29. ^ a b "The Low-down On Analogue Interfacing -". Retrieved 16 August 2018.
  30. ^ Gibson, Bill. (2007) The Ultimate Live Sound Operator's Handbook, p. 202. Hal Leonard Corporation. ISBN 1-4234-1971-5
  31. ^ "Switchcraft Telephone Jack and Telephone Plug Mating Chart" (PDF). Archived from the original (PDF) on 2014-04-13. Retrieved 2013-06-24.
  32. ^ MIL-J-641
  33. ^ "Item # TP-101, Telephone Plug". Amphenol NEXUS Technologies. Retrieved 7 March 2023.
  34. ^ "Item # TP-102, Telephone Plug". Amphenol NEXUS Technologies. Retrieved 7 March 2023.
  35. ^ "Item # TP-120, Telephone Plug". Amphenol NEXUS Technologies. Retrieved 7 March 2023.
  36. ^ "Item # TP-105, Telephone Plug". Amphenol NEXUS Technologies. Retrieved 7 March 2023.
  37. ^ "Bose A20 Aviation Headset Owner's Guide" (PDF). 2022. Retrieved 5 March 2023.
  38. ^ "Type 671 datasheet" (PDF). Retrieved 5 March 2023.
  39. ^ "British Aircrew 671-Type Plug / NATO Plug". Retrieved 5 March 2023.
  40. ^ Ranjan Parekh; Ranjan (2006). Principles of Multimedia. Tata McGraw-Hill Education. pp. 225–. ISBN 978-0-07-058833-2.
  41. ^ "Switchcraft Z15J 1/4" High Power Speaker Jack". Full Compass. Retrieved October 24, 2011. High power 2-conductor speaker jack carries 15A (continuous) audio speaker current levels.
  42. ^ "Computer microphones". Retrieved 2021-12-11.
  43. ^ "Questions Answered 4: Optical Output on the Mac".[permanent dead link]
  44. ^ "Which one is the microphone jack?". MacRumors Forums.
  45. ^ "Wired Analogue Audio" (PDF). Retrieved 2012-06-01.
  46. ^ "MEElectronics – P version headset earphone compatibility". Archived from the original on 2010-12-27. Retrieved 2013-07-14.
  47. ^ "iphone - Why do Chinese EarPods not work with German MacBook Pro?". Ask Different. Retrieved 2020-04-24.
  48. ^ a b c d "Linx:What is your mobile phone headset jack standard: OMTP or CTIA?-Headset OEM|Earphone Factory|Headphone Supplier —China LINX CO,.LTD". Retrieved 2020-04-24. In order to fit the Chinese national conditions, Apple China released Earpods with some changes, specifically for the Chinese market, to make it in line with the Chinese domestic OMTP standard. ... Therefore, iPhone original headsets sod in China are different from Earpods sold in other regions.
  49. ^ a b "IPhone国行耳机不兼容问题 - Apple 社区". Retrieved 2020-04-24.
  50. ^ "Headphone inline controls – how they differ on Apple iOS vs. Android/Nokia | Hacker News". Retrieved 2020-04-24.
  51. ^ "Xiaomi In-Ear Headphones Pro HD (2 +1 Hybrid)". Headphone Reviews and Discussion - Retrieved 2020-04-24.
  52. ^ "Smartphone Headset Standards: Apple iPhone, AHJ (CTIA), & OMTP". Headset Buddy Help. Retrieved 2020-04-24.
  53. ^ "3.5 mm Headset Jack: Device Specification". Android Open Source Project.
  54. ^ "Smartphone Headset Standards: Apple iPhone, AHJ (CTIA), & OMTP". Retrieved 15 August 2021.
  55. ^ "Understanding TRRS and Audio Jacks – Cable Chick Blog". Retrieved 16 August 2018.
  56. ^ "TV Out on the Nokia N95". All About Symbian. Retrieved 6 October 2019.
  57. ^ "Singtel Group, first in the world to launch breakthrough Android 2.1 Samsung Galaxy S". Retrieved 6 October 2019.
  58. ^ "Jays AB headset for Windows Phone and a note on headset standards". Retrieved 26 March 2017.
  59. ^ "2012 Xperia range uses different 3.5mm headset standard | Xperia Blog". 27 February 2012. Retrieved 2017-08-17.
  60. ^ Yaesu FT-60R Technical Supplement (PDF). VERTEX STANDARD CO., LTD. 2005. pp. 10, 13.
  61. ^ "Radio Wiring - ArgentWiki". Retrieved 2020-05-29.
  62. ^ "MH-37A4B wiring diagram". Retrieved 2020-05-29.
  63. ^ Sony and Panasonic camcorder service manuals
  64. ^ "Grandstream Blog". Retrieved 2023-03-05.
  65. ^ "RC-5325A".
  66. ^ "USB Type-C Cable and Connector Specification Release 2.1". See Audio Adapter Accessory Mode (Appendix A)
  67. ^ FAQ – What type of wired headsets can I use with my Nokia Lumia phone? – "Nokia Lumia 820 and 920 support both American Headset Jack (AHJ) headsets and standard Nokia OMTP headsets."
  68. ^ Jays AB headset for Windows Phone and a note on headset standards – "Nokia's Windows Phone 8 devices (Nokia Lumia 520, 521, 620, 720, 810, 820, 822, 920, 925, and 928) use a new universal connector, enabling the use of both AHJ and OMTP headsets."
  69. ^ "TS3A227E Autonomous Audio Accessory Detection and Configuration Switch".
  70. ^ Digital Silence (earphone manufacturer): explanation of TRRS connectors and availability of adapter.
  71. ^ "ITU-T Work Programme". Retrieved 26 March 2017.
  72. ^ Sauerborn, Denis (2019-04-12). "Pentaconn – Das steckt hinter der 4,4 Millimeter-Kopfhörerverbindung" [Pentaconn - About the 4.4 millimeter headphone connector]. mobile fidelty magazine (in German). Archived from the original on 2022-05-25. Retrieved 2022-11-28.
  73. ^ "About Us". Pentaconn Global. Subang Jaya, Selangor, Malaysia: Nippon DICS SDN BHD. 2016. Archived from the original on 2022-11-11. Retrieved 2022-11-28.
  74. ^ "Jack Schematics table" (PDF).
  75. ^ a b "Q. What's wrong with my patchbay? -".
  76. ^ "Frequently Asked Questions". Retrieved 2012-05-28.
  77. ^ Sweetwater (2000-01-13). "Sweetwater inSync". Retrieved 2013-07-14.
  78. ^ "Silent Way's recording tricks- Mackie CR-1604 mixer". Retrieved 2013-07-14.
  79. ^ "Frequently Asked Questions". QSC Audio Products.
  80. ^ "Diagrams" (PDF). Retrieved 2012-05-28.
  81. ^ [1] Archived November 10, 2006, at the Wayback Machine
  82. ^ "Neutrik mil-b-gauge-type plugs".
  83. ^ Smoot, Ryan. "Understanding Audio Jack Switches and Schematics". CUI Devices. Archived from the original on 2023-04-01. Retrieved 2023-06-07.
  84. ^ "dbx 166XL compressor with balanced TRS tip send input and output jacks and one TRS ring send sidechain jack".