Signetics Corporation
IndustryIntegrated circuits
FounderDavid Allison, David James, Lionel Kattner, and Mark Weissenstern
FateAcquired by Philips

Signetics Corporation was an American electronics manufacturer specifically established to make integrated circuits.[1] Founded in 1961, they went on to develop a number of early microprocessors and support chips, as well as the widely used 555 timer chip. The company was bought by Philips in 1975 and incorporated in Philips Semiconductors (now NXP).[1]


Logo used from the 1960s to 1971
Logo used from the 1960s to 1971

Signetics was started in 1961, by a group of engineers (David Allison, David James, Lionel Kattner, and Mark Weissenstern) who had left Fairchild Semiconductor.[1] At the time, Fairchild was concentrating on its discrete component business (mostly transistors), and its management felt that by making integrated circuits (ICs) it would lose its customers. Signetics founders believed that ICs were the future of electronics (much like another contemporary Fairchild spinoff, Amelco) and wished to commercialize them. The name of the new company was coined from Signal Network Electronics.

The venture was financed by a group organized through Lehman Brothers, who invested $1M. The initial idea was to design and manufacture ICs for specific customers. In order to facilitate this goal, Signetics did not have a separate R&D lab; instead, the engineering was all done in technical development department, and was closely tied to marketing.

Signetics first developed a series of standard DTL ICs, which it announced in 1962. However, it was struggling to sell custom-made circuits, which was the original goal, and was quickly exhausting the initial investment money, so new investors had to be found. In November 1962, Corning Glass invested another $1.7M in Signetics, in exchange for 51% ownership. This money enabled Signetics to survive, and much of the funding was put into a marketing and sales campaign.

In 1963, the Department of Defense made a decision to begin a shift towards microelectronics and ICs, due to their small size, higher reliability, and lower power consumption. As a result, military contractors began to explore the field, and as Signetics was one of the few firms selling custom circuits, it benefited greatly. In the fall of 1963 and throughout most of 1964, sales grew quickly, and the company finally became profitable. Signetics also grew rapidly, hiring more engineers and increasing its manufacturing space. In 1964, Signetics opened a large new fabricating plant ("fab") in Sunnyvale, California. At this time, it was by far the largest manufacturer of ICs in Silicon Valley. It later expanded also to factories in Orem, Utah and Albuquerque, New Mexico, where there were two fabs, FAB22 (4-inch) and FAB23 (6-inch).

In 1964, Fairchild began to muscle its way into the IC business. Since Signetics circuits were the de facto standard in the market, Fairchild decided to copy them. However, it used its superior cash position, marketing power, and manufacturing strength to undercut its competitor by slashing prices and flooding the market. Signetics was struggling to compete, and began losing money again. Corning saw this as proof of poor management, and used its controlling interest to drive out most of the founders and take complete control of the company.

Signetics managed to stabilize and become profitable again, but it never regained its market leadership, which was now firmly held by Fairchild. Its engineers continued to innovate in IC technology, and remained a significant force. Around 1971, the Signetics introduced the innovative 555 timer IC, which it called "The IC Time Machine".[2] This was the first and only low-cost commercial IC timer available at the time, and soon became a best-seller. Signetics was known for creating innovative ICs for both analog electronics and the rapidly-growing digital electronics applications.

Logo used from 1981 until its closure
Logo used from 1981 until its closure

In 1975, the company was acquired by Philips, who continued the brand for some years. In the United States, Signetics reached its manufacturing height at around 1980. Later it was fully integrated into Philips Semiconductors (now NXP).[1]

In 1995, Philips spun off the assembly and test operation in South Korea, which was started by Signetics in 1966, as an independent subcontract service provider. They continue to use the name "Signetics". Since 2000, the Signetics brand is primarily used by the Young Poong Group.[3]

Notable devices

Signetics introduced a number of innovative analog and digital integrated circuits which became de facto standard products widely used in mass-produced electronics. Freely-distributed application notes published by Signetics were key in educating students and practicing engineers in the usefulness and simplicity of their ICs. Some designs remain iconic and are still used today in basic electronics lab exercises.[2]

See also


  1. ^ a b c d "NXP Semiconductors: Company History". Silicon Valley Historical Association. Retrieved 2013-02-08.
  2. ^ a b Cimbala, John M. "The 555 Timer IC" (PDF). ME345. Penn State University. Retrieved 2022-02-27.
  3. ^ Levine, Bernard (2000-06-12). "Signetics Korea Changes Hands". EDN. Retrieved 2023-03-29.
  4. ^ "Emerson Arcadia 2001". Retrieved 2013-02-08.
  5. ^ 2513 text display ROM
  6. ^ "Datasheet Archive 2513 datasheet download".
  7. ^ Lancaster, Don (September 1973). "TV Typewriter" (PDF). Radio-Electronics. New York: Gernsback Publications. 44 (9): 43–52.
  8. ^ "FPLA's give quick custom logic". EDN. Boston, MA: Cahners Publishing. 20 (13): 61. July 20, 1975. Press release on Signetics 82S100 and 82S101 field programmable logic arrays. Sixteen inputs pins, 8 output pins and 48 product terms. NiCr fuse link programming.
  9. ^ Birkner, John (8 December 2021). "How the FPGA came to be, Part 2". Electronic Engineering Journal. Retrieved 10 April 2022.
  10. ^ Electronic Musician. Polyphony Publishing Company. 1993. p. 51.
  11. ^ Yu. K. Rybin (2011). Electronic Devices for Analog Signal Processing. Springer Science & Business Media. p. 21. ISBN 978-94-007-2205-7.
  12. ^ Mark A. Haidekker (2013). Linear Feedback Controls: The Essentials. Newnes. p. 227. ISBN 978-0-12-405513-1.

Further reading