[sdiy] What do people use for matched transistors these days?

Mike Bryant mbryant at futurehorizons.com
Sat Sep 9 10:17:23 CEST 2023


Nxperia also do dual transistors without the base resistors e.g. BC856S.  They are on the same die so will be well matched.

________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Scott Bernardi via Synth-diy <synth-diy at synth-diy.org>
Sent: 09 September 2023 00:33
To: SDIY List <synth-diy at synth-diy.org>
Subject: [sdiy] What do people use for matched transistors these days?

Right now I'm looking at matched pnp's, suitable for a VCO.  Something like the THAT-320 quad pnp would be ideal, but they are kind of pricey. The quad is nice because you have an extra matched transistor you can use for high frequency tracking adjustment.

I ordered some BCM856's to see how they will pan out.  I think the VBE match will be good enough, I'm wondering about the base resistance that causes deviation from ideal log conformance.

For npn's, THAT-300 or MAT14 are the best, also pricey.

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