[sdiy] Cannot find % of precision of 2N2223 matched pair ..

Neil Johnson neil.johnson71 at gmail.com
Tue Jan 14 16:02:24 CET 2014


On 14 January 2014 14:48, Tom Wiltshire <tom at electricdruid.net> wrote:
> Hohoho. Does hfe within 20% even count as matched? I could probably do better pulling random trannies out of a box.
>
> The other figure it gives is Vbe to within 15mV. How does that rate? Sounds pretty poor to me - it's the biggest number on the list. The better ones manage <5mV.

The 'A' variant is better, as you'd expect from being sorted.  The
corollary being the non-A parts are probably worse than the A parts
(otherwise they'd be marked as 'A' parts).  You could almost guarantee
the Vbe mismatch would be at least 5mV for the non-A parts.

Neil
--
http://www.njohnson.co.uk



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