GDR transitors from 1987

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:

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

Am Wed, 30 Sep 2009 15:49:39 +0100 schrieb N_Cook:

I think

SC237 = BC237 SC238 = BC238 SC239 = BC239

Lutz

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Thanks for the link, I'll note it down

I'd previously come across this sort of cross-coding , for ICs eg ones marked "X2 080" ,"X8 761" ,"TL 761" (not opto) ,"X8 082" ,"X6 081" ,"X6 082" , V4007D

B080D = TL080 B081D = TL081 B082D = TL082 B761D = TAA761 V4007D = CD4007UBE

but not the transistor version

"N_Cook" schrieb:

Your translation is OK. Just as a side note, the X2, X8 etc. you've got there is the date code (but offhand, I can't tell you the exact encoding) -- so it can vary quite a bit.

Heiko Nocon schrieb:

A copy of the respective datasheets can be found here:

Note that this is displaying pages from a small (pocket-size) datasheet handbook; the full datasheets have each been published in a national standard (TGL). These standards are usually still available in many East German university libraries -- no idea whether you could access them from England. (But that's probably not very important for just a transistor or industry-standard IC only.)

N_Cook schrieb:

NPN, complementary KD616

snipped-for-privacy@uriah.heep.sax.de meinte am 30.09.09:

Das Herstellungsdatum kann man dann hier entschlüsseln:

MfG Udo

Thanks for the link

on the table for KD501 KD502 KD503 KD605 KD606 KD616 KD607 KD617

is there a row for hFE/beta/gain or Ft/frequency where gain is 1 ?

N_Cook schrieb:

Regards, Dieter