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

Mike Bryant mbryant at futurehorizons.com
Fri Sep 15 20:53:08 CEST 2023


They will be very well matched and also held at the same temperature.
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Pete Hartman via Synth-diy <synth-diy at synth-diy.org>
Sent: 15 September 2023 19:34
To: SDIY List <synth-diy at synth-diy.org>
Subject: Re: [sdiy] What do people use for matched transistors these days?

Hm.
- can these still apply the same logic of "two transistors on the same strip are probably close enough" ?
- I'm curious what the use case is for a dual transistor where they're not matched.... I mean these cases are a *little* smaller than two individual SOT-23's but there are also smaller packages that could be used.

Pete

On Fri, Sep 15, 2023 at 11:56 AM Neil Johnson via Synth-diy <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>> wrote:
Hi,

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

Umm, no, they're not, according to Nexperia:

"these dual are all 2 die solution where we take them from the same wafer.
No plans to develop these parts using a single die unfortunately since
the main goal is to maximize volumes of the single die version."

A shame as it would be a great option to replace the long-gone
2SC1583, etc.  I remember years ago asking Philips about the PUMX1 and
got a similar response:
http://synth-diy.org/pipermail/synth-diy/2001-April/013380.html

Neil
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