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Solitron Devices


Solitron Devices, Inc. is an American semiconductor manufacturer.



In 1971, Unisem advertised model UA3533, a single-chip keyboard encoder with 4608 bits of look-up table ROM capacity. The next year, it was advertised as a Solitron Devices product, following the 1971 acquisition of United Aircraft’s Unisem semiconductor division by Solitron Devices.

The product was specified as follows:

As a static encoder, this will not be matrix scan. Consequently, this may be a two-of-N encoder, requiring switches with dual isolated outputs. There seems to be no other documented mention of this chip, although it does appear on surplus part sites.


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