Hi Paul,
Is it possible these are "counterfeit / reject" transistors that have
been badged
as 2N3904.....Seems highly unlikely there are 2 versions with
different pinouts.
Graham
On 27 Feb 2009, at 06:47, Paul Schreiber wrote:
> I had a ∗long∗ debugging session with a customer building a MOTM-300
> VCO
> from parts. Was dead in the water (no outputs). He had previously
> replaced
> ∗all∗ op amps, the MAT-02EH and the LM319. To no avail.
>
> Them we started on the transistors. He noticed that he had 2
> 'batches' of
> 2N3904s:: 2N3904 - CJ22 and others marked 2N3904 - J04.
>
> It turns out these have ∗different pinouts∗. It's still an "2N3904"
> but not
> the proper EBC pinout! Which is...errr...NOT per JEDEC standard (the
> 2N
> means the part is supposed to be in a registered database) but I
> guess no
> one gives a rat's ass about JEDEC, JAN-TX and all those 'old fart'
> transistor specs.
>
> So, ∗be very careful∗ buying 2N3904s, you want EBC pinouts. CHECK
> THE DATA
> SHEETS!
>
> Paul S.
>
>
>