[sdiy] MPQ2907 Quad Transistor Info?

[James Patchell]

29 cents would put it in the worthwhile category for me...I have been 
tempted to try such arrays myself, but have never gotten around to it.  It 
will be interesting to hear your results...

At 09:02 PM 10/20/2003 -0700, Scott Stites wrote:
>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
> > ***************************************************
> > I'm a man
> > But I can change
> > If I have to
> > I guess.
> >
> > Man's Prayer
> > Red Green
> >
> > ***************************************************
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> >
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> >
> >
> >

         -Jim
***************************************************
I'm a man
But I can change
If I have to
I guess.

Man's Prayer
Red Green

***************************************************
http://www.oldcrows.net/~patchell

http://members.cox.net/patchell

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