Hirose U.FL
Male U.FL connector
Type RF coaxial connector
Production history
Designed 1991[1]
Manufacturer Hirose Electric Group
General specifications
Diameter 2.0 mm (0.079 in)
Cable Coaxial
Passband Typically 0-6 GHz
An embedded RouterBoard 112 with U.FL-RSMA pigtail and R52 mini PCI Wi-Fi card.

Hirose U.FL, I-PEX MHF I[a], AMC[2] or UMCC[b] is a miniature RF connector for high-frequency signals up to 6 GHz manufactured by Hirose Electric Group,[3] I-PEX,[4] and others.

U.FL connectors are commonly used in applications where space is of critical concern, such as in smartphones and laptop Wi-Fi cards. U.FL connectors are commonly used inside laptops and embedded systems to connect the Wi-Fi antenna to a Mini PCI, Mini PCIe or M.2 Wi-Fi card. Another common use is connecting GPS antennas.

Female U.FL connectors are not designed with reconnection in mind, and they are only rated for a few reconnects (approximately 30 mating cycles[5]) before replacement is needed. The female U.FL connectors are generally not sold separately, but rather as part of a pigtail with a high-quality 1.32 mm doubly shielded cable, which allows for a low-loss connection, insulated with fluorinated resin.

The male connectors are surface-mounted (SMT) and soldered directly to the printed circuit board (PCB). They are designed to have a characteristic impedance of 50 ohms. The mated connection is only 2.5 mm high and takes as little as 9 mm2 (3.0 × 3.1 mm2) of board space.[6][7]

Much like many other electronic components, Hirose U.FL connectors were protected by patents[1] and trademarks. However, compatible third party connectors are available under many other names, such as Sunridge MCB.

Hirose W.FL

Hirose W.FL
Type RF coaxial connector
Production history
Manufacturer Hirose Electric Group
Cable coaxial
Passband 0-6 GHz

The Hirose W.FL, also known as Amphenol AMMC,[8] is an ultra-small RF connector used in handheld electronic products. It is manufactured by Hirose Electric Group and has a frequency range up to 6 GHz.[9] Compared to its predecessor U.FL it occupies even less area (2.0 mm diameter) and height (1.4 mm).[7]

Like U.FL, W.FL also has many more names assigned to it by those producing compatible connectors.[10]


  1. ^ occasionally written "MHF1" or "IPEX1"
  2. ^ Ultraminiature Coax Connector and Cable Assembly Style A Series, Tyco Electronics


  1. ^ a b Surface-mounted, high-frequency coaxial connector. US Patent 5180315 (1993)
  2. ^ "AMC Ultra Miniature Connectors | Amphenol RF". www.amphenolrf.com. Retrieved 2018-10-15.
  3. ^ Ultra Small Surface Mount Coaxial Connectors - Low Profile 1.9 mm or 2.4 mm Mated Height U.FL Series. Hirose data sheet.
  4. ^ MHF I - 9 GHz, 2.5 mm mated height
  5. ^ SMT Ultra-Miniature Coaxial Connectors - Product Specifications
  6. ^ IPX datasheet
  7. ^ a b "U.FL and W.FL Series Connectors - Hirose │ DigiKey". www.digikey.hk. Retrieved 7 November 2019.
  8. ^ AMMC series datasheet
  9. ^ "Hirose W.FL Coaxial Cable Connector". Wellshow Technology. Retrieved 28 January 2015.
  10. ^ "IPEX MHF3 Mini Coax Connector". Wellshow -RF Connector, RF Coaxial Cable Assembly, GSM, GPS, WiFi Antenna Manufacturer. IPEX MHF3 RF coaxial connector is compatible to Hirose W.FL series, Sunridge MCD series, and Amphenol MHC251/ MHC250 series.