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Vintage threads from the first ten years

C557B? transistor

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5/21/1999 3:53 AM
aron	C557B? transistor A pedal I am trying to trace has a C557B transistor in it. Is anyone familiar with this transistor? Is it PNP or NPN and does anyone have a pinout? Thanks, Aron

5/21/1999 5:19 AM
gfr	It's a BC557 witha different label. It's PNP. With the "flat" side facing you: ----------- ~p~ ~p~ ~p~ C557B ~p~ ~p~ ~p~ ----------- ~p~ ~p~ ~p~ C B E It's just a general purpose Si PNP transistor like the 2N3906. You may want to try a BC559 (low-noise verion). GFR

5/21/1999 7:17 AM
R.G.	You sure it's not a 2SC557B? I'm very used to the Japanese transistors having the "2S" left off, but I've never seen a BCxxx series with the "B" left off. This is probably just my inexperience with the BC series, as I don't get a lot of them.

5/21/1999 7:59 AM
Anders Westerberg	I recently dealt with a BC series transistor (don't remember which one) with the B left out. I also thought it was a 2SC series at first, but the number didn't even exist in the 2SC series. Anders

5/21/1999 8:13 AM
R.G.	OK, that begins to make sense then. I just had never run into one of those.

5/21/1999 9:55 AM
gfr	The BC series is the most commom small signal transistor series here (Brazil). In fact it's impossible to get a 2N3904/2N3906 here and the 2N2222 is a little hard to find... I've never seen a label on a schematic with the "B" dropped but I've seen lots of actual transistors labelled this way. Right now on my bench there's a bunch of C237B (BC237).

5/24/1999 8:39 AM
Gus	R.G. this is a first for me all cxxx have been 2scxxx.

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