GDR transitors from 1987

30/09/2009 - 16:49 von N_Cook | Report spam
Enquiry from England
How to read TO92 package transistor type numbers, marked
EW4 C37
EW3 C39
EW3 C38

I assume C is a year letter and EW number the type numbers

Any site for basic details/ cross-references for those and others like
SF118B, metal cased
SF828D , TO92
SD339, TO126
KD606, TO3

My 1987 ECA - Munchen databooks do not list anything like them

The above collection in a Sound City 30R amplifier , previously I've found
similar in a Bullet VM30 amp
 

Lesen sie die antworten

#1 Heiko Nocon
30/09/2009 - 17:52 | Warnen spam
N_Cook wrote:

Enquiry from England
How to read TO92 package transistor type numbers, marked
EW4 C37
EW3 C39
EW3 C38

I assume C is a year letter and EW number the type numbers



You failed. The C is the last letter from the part name. For instance
C37 is an SC237.

In the GDR nomenclature for semiconductors the first letter discribes
the used material, most important: "S" is silicon.
The second letter determines the desired application for the part, most
important: "C" is low power, low frequency, "S" is switching, "D" is
high power, low frequency and "F" is low power, high frequency.

A list of GDR transistors (in german) with some western spare parts too
you can find here:

http://www.elektron-bbs.de/elektron...ransis.htm


KD606, TO3



This is not a transistor made in GDR. It's made by TESLA brand,
Czechoslovakia.

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