MOTM

--Where did you buy these?

I've never heard of this problem: same PN and package having different
pinouts!
That's just WRONG!


> 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.
>>
>>
>>
>
>
>


-- 
John Blacet