SGS logo

I have little original information about the early manufacture of semiconductors in Italy. However, there are some sources:

Google Books contains 'A History of the World Semiconductor Industry' by P.R.Morris. The pages on early Italian efforts state that the history of the Italian industry 'is largely that of one company', the SGS (Società Generale Semiconduttori) founded in 1957. In 1960 SGS developed a strategic relationship with Fairchild creating Fairchild-SGS. This lasted until 1968, after which they ran into financial difficulties. Fairchild sold its interest to Olivetti and the company reverted to being just SGS.

Morris's statement is perhaps unfair because the company Ates Componenti Elettronici (Aziende Techniche Elettroniche del Sud) was formed in the 1950’s to provide electronic components for the Italian government-operated telecommunications company S.T.E.T. (Societa Finanziara Telefonica). Ates was a subsidiary of Siemens, licensed to use RCA technology, and produced many germanium transistors in the standard pro Electron series AC, AD, AF, AL and AU.

In 1971 the Italian government decided to merge SGS with Ates to form SGS-Ates. To further confuse those searching for early devices, SGS subsequently dropped the 'Ates' and merged in 1987 with the French company Thomson Semiconducteurs, to form SGS-Thomson.

Rather oddly, the oldest italian databook that I possess - 'Manual Transistor', a supplement of 'La Technica Illustrata' dated 1960, contains no devices by either SGS ot ATES. It does list a very limited number of transistors by the manufacturers:

Two useful sources of early device data (and dates) are the books by Derivation and Tabulation Associates (D.A.T.A):

You can view and download those in full from the links above. The transistor book has an entry for MISTRAL that just says "SAME TYPES AS COSEM".


I do not know which were the first devices that SGS made. They may have started, like most others, with silicon point-contact microwave diodes for radar. If so, I have not found evidence or data for them. The 1961 D.A.T.A. book listed above shows three groups of products:

1G58 diode
  • germanium diodes in the 1G series. The image on the right shows 1G58, a miniature glass type. The letters SGS are printed under a geometric shape described below.
1S538 diode
  • many silicon diodes in the 1S series. The image on the right shows 1S538, a rectifier.
  • 1SV120 and 1SV130 diodes, about which I know nothing.

If you have information about any of these three groups of diodes, please


I'm also unsure of SGS' first transistors. The 1962 D.A.T.A. book listed above shows:

SGS 2G108 transistors

This image shows the 2G108. It has the same geometric shape above the letters SGS as the 1G58 diode. I have not found any reference to this being an early SGS logo.

SGS 2G271 transistors

Here is what I believe to be 2G271, although the '2G' is missing.

If you have original data for SGS transistors, please


SGS EF1 transistor

I have come across other transistors such as this EF1 that I suspect are SGS 'hobbyist' types, although they are unbranded. There are a number of types: EC1, ED1, ED2, EF1, EF2, EIF1, EIF2, EIF11, EIF12.

If you have information about these, please


I have little original Ates data, and oddly, they do not appear in the D.A.T.A. books listed above. A fairly early, quite comprehensive, but badly organised data source is the 1966 Romanian book "Catalog de Dispozitive Semiconductoare" by Veronica Vătăşescu and Şerban Epure, which you can download from the Web. It lists the following ATES types:

  • AC134, AC135, AC136, AC137, AC138
  • AF146, AF147, AF148, AF149, AF150, AF168, AF169, AF170, AF171, AF172
  • AF142, AF143, AF144, AF164, AF165, AF166
  • AD142, AD143, AL100, AL101, AL102, AL103
AC191 transistor

I only have a few ATES devices, here is an AC191 in the standard TO-1 package. It is a germanium PNP AF type, possibly an output driver transistor.

AUY35 transistor

And here is a rather corroded AUY35 which is a germanium PNP medium-power AF type in the TO-8 package.

AD142 transistor

This AD142 is a germanium PNP high-power AF type in the TO-3 ooutline. The high dome and the printed ATES in large letters cause me to suspect it is early production.

Condor logo

There was an Italian radio manufacturer called Condor Radioelettromeccanica S.p.A., Via Ugo Bassi, 23a - Milano. Their logo (shown) was the word "Condor" in an italic script. Occosionally, ATES power transistors can be found branded with this logo.

If you have original data for Ates devices, please


AY105K diode

The only SGS-ATES germanium device that I possess as this AY105K diode. It uses a TO-1A can inside an aluminium cuboid heatsink, more often used by Telefunken for their transistors. In fact, the subscript K is short for the German word Kühlkörper meaning heatsink.


I possess few SGS-Fairchild devices: only the TO-18 transistor types C111, CS4 and V405A for which I have no data (or images).

If you have data for any of these, or other early SGS-F types, please


I possess no devices made by MISTRAL, also called 'microfarad'. As far as I know, they made the following:

If you know where I might find any of these, please