AEI Semiconductors

AEI Semiconductors Avalanche Diodes
British Thomson Houston established a semiconductor manufacturing facility in Carholme Road, Lincoln, England in 1956 with a focus on power devices. In 1963 it became part of AEI, and the AEI Rugby R&D team were transferred in 1966.
In 1967 GEC acquired AEI, and in 1975 further semiconductor research activities in CMOS and RF were transferred from GEC Central Research to Lincoln.
In the early 1980s a new facility was built in Doddington Road with ICs and RF devices transferred to the new facility. Carholme Road continued to produce power devices including general purpose and fast recovery diodes, GTOs and thyristors.
Doddington Road produced standard, semi custom and full custom CMOS ICs and SOS devices for Space. RF devices included GaAs products, SAW filters and passives.
Together with Hybrid facilities in Swindon and Portsmouth the company changed its name to Marconi Electronic Devices Ltd (MEDL).
MEDL became uncompetitive in digital CMOS but the SOS and power devices remained under the name of Dynex Semiconductors. Dynex still exist at Doddington Road producing power semiconductors (now with a Chinese owner).

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