[sdiy] LM394 vs. MAT02 vs. ?

[James Patchell]

The MPQ3906 is not matched.  It is just four transistors in the same 
package.  It does have the advantage that they are in good thermal contact 
with each other.  And, with todays processing, you actually have pretty 
good odds that the die inside will match up pretty good.

If you want true matched quad 2n3906 or 2n3904 transistors, you need to 
move up to the THAT320 or THAT300 arrays, which are pricey.

At 09:41 AM 11/5/2004 +0200, rizacan wrote:
>There is also MPQ3906 which is 4 times 2n3906 (4 matched PNP). It is a 
>litle bit expensive but good transistor.
>
>
>
>
>Metrophage wrote:
>>
>>--- <mailto:larry at unicode.com>larry at unicode.com wrote:
>>
>>
>>>
>>>I have been looking for LM394's for use in the CGS VCO module and
>>>found a couple of sources at just over $5US each.  I noted from
>>>
>>
>>several
>>
>>>
>>>articles that the MAT02 might be usable as an alternative, however
>>>
>>
>>I've only
>>
>>>
>>>found a few at $15US each!  Is there any significant difference
>>>
>>
>>between these
>>
>>>
>>>two parts?  At there any substitutes that would work just as well but
>>>
>>
>>be
>>
>>>
>>>more available and cost less?  Should I jump on either of the parts
>>>
>>
>>at the
>>
>>>
>>>indicated prices?
>>>
>>>Larry T.
>>>
>>
>>
>>Well, I never see LM394's anywhere. I have tried MAT02's with excellent
>>results on my ASM-1 VCO clone as well as on my (unfinished) real ASM-1.
>>Word on the street is that the MAT0x and THAT units are the best
>>matched. I am not very knowledgable about transistors yet, bet these do
>>seem a lot better than, for instance, the 3046 arrays.
>>
>>I don't know if you need these to be a certain pin format for a PCB, or
>>if you are wiring it yourself - but there are some decent, inexpensive
>>transistor pairs out there.
>>
>>2SC1583         - dual NPN, 5-pin SIP, common emitter, Mitsubishi
>>2SA798          - dual PNP, 5-pin SIP, common emitter, Mitsubishi
>>2SA1349         - dual PNP, 7-pin SIP, Toshiba
>>2SC2291         - dual NPN, common base
>>2SC3381         - dual NPN, 7-pin SIP, Toshiba
>>
>>These can often be found in price ranges from less than a dollar, to
>>two dollars each. I know I have seen them on the pages of MAT
>>Electronics (PA), and electronix.com (OH). Maybe not as accurate and
>>low-noise as the $15 units, but probably still consderably better than
>>the RCA arrays or hand matched (same substrate). If you are interested,
>>there are datasheets online. For years I had no idea that these
>>existed!
>>
>>$5 for LM394 is probably quite good. Some places still carry the Analog
>>Devices SSM2210 matched NPN pair for a comparable price.
>>CJ
>>
>>
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>
>         -Jim
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>http://www.oldcrows.net/~patchell
>
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