[sdiy] SMT noise generation?

Dave Manley dlmanley at sonic.net
Mon Aug 13 19:10:48 CEST 2012

Should just be the same die in a different package.  The only difference should be due to the package - for example lead inductance - that wouldn't be in play for audio use anyway.


-------- Original Message --------
 From: Joe Grisso <jgrisso at det3.net>
 Sent: Mon, Aug 13, 2012 09:53 AM
 To: synth diy <synth-diy at dropmix.xs4all.nl>
 Subject: [sdiy] SMT noise generation?

>Hello all,
>     I've got an analog noise generator design I'm fleshing out, and
>hit a bit of a wall. I'm reaching out to do a sanity check since my
>discrete engineering expertise is a wee bit rusty. The simple question
>goes: If I have a TO-92 BC547 and replace it with a SOT-23 BC847,
>since they are the same part and have the same parameters, would that
>mean they would generate the same amount of noise? Part of me says yes
>because all the other parameters (Hfe, Vce, Ic, etc) line up, but
>another part of me says that since it's in a smaller package and may
>use less material to achieve those properties that there would be less
>noise. Could anyone clear this up for me?
>Joe Grisso
>Detachment 3, Ltd.
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl

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