[sdiy] MPQ2907 Quad Transistor Info?

[Scott Stites]

Thanks, Jim!  It never occurred to me that they would actually not be on the
same substrate, but they sure look worth a try, and the thermal tracking
would be a plus.

They're certainly cheap enough (29 cents apiece at Hosfelt).

Cheers,
Scott

----- Original Message -----
From: "James Patchell" <patchell at cox.net>
To: "Scott Stites" <scottnoanh at peoplepc.com>; <synth-diy at dropmix.xs4all.nl>
Sent: Monday, October 20, 2003 6:13 PM
Subject: Re: [sdiy] MPQ2907 Quad Transistor Info?


> The MPQ2n2907 might be useful...but, the transistors are not on the same
> substrate (they are individual die), and so you cannot guarantee any sort
> of matching at all....however...you would probably find that they are
> matched more than good enough.  Most likely, the die all came from the
same
> wafer (but you cannot count on that), so, they are probably better matched
> than you would think.  Even when I purchase 2n3906's and set about to
match
> them...I am amazed at how often a batch of 20 or so will all be within
> about 2 mV or so.  So, if they are cheap (like maybe 20 cents a dip, or in
> that range), give them a try.  Even though they are not on the same
> substrate, they are in the same package and will probably thermal track
> good enough.  However, they are not cheap (say $2 a dip)...I would say
> forget it...and look into transistor arrays from THAT corporation...
>
> At 07:54 PM 10/20/2003 -0700, Scott Stites wrote:
> >Hi list,
> >
> >I received my most recent Hosfelt catalog and ran across the quad PNP
> >package MPQ2907N.  Since apparently the transistors are on the same
> >substrate, could I assume they're reasonably matched?  I couldn't really
> >find much information on them on the web.  Any info would be appreciated.
> >
> >Thanks,
> >Scott
>
>          -Jim
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