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Subject: Transistors circuits by the thousands
X-Newsreader: Forte Agent 1.91/32.564
Date: Wed, 01 Jan 2003 22:24:29 GMT
NNTP-Posting-Date: Wed, 01 Jan 2003 15:24:29 MST
I'm looking at the datasheets for a 2n3904. It specifies an hfe of at
least 20 at ic=.1ma. The "typical" performance curve show a gain of
I need the hfe to be at least 50.
If I was designing a circuit to be manufactured by the thousands, how
risky would it be if I do not use worst case values? Am I really
likely to end up with a batch of transistors that stray far from the
My alternative is to use another transistor (more cost, higher parts
Does anyone have experience with this? Do you always use worst case
values for high volume designs? I've looked at designs from far east
manufacturers and they often seem to get away with simply using
Your comments would be appreciated.
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