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

Tom Wiltshire tom at electricdruid.net
Tue Jan 14 15:48:47 CET 2014


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.


On 14 Jan 2014, at 13:58, Jean-Pierre Desrochers <jpdesroc at oricom.ca> wrote:

> Hhhmmmm.... Not a very good NPN match for DIY..
> 
> Thanks Tom.
> 
> Le 2014-01-14 08:47, Tom Bugs a écrit :
>> First google search for "2N2223 Datasheet"
>> http://www.alldatasheet.com/datasheet-pdf/pdf/99265/CENTRAL/2N2223.html
>> Suggests 20%
>> On 14/01/2014 13:40, Jean-Pierre Desrochers wrote:
>>> Can any body come with the percentage of precision
>>> of a 2N2223 NPN matched pair can ?
>>> I could find some specs on that part but nothing
>>> is said about the precision of the NPN transistors pair..
>>> For example SSM2210 trannys are 0.5%, LM394 are 2% matched.
>>> Any finds welcome.
>>> J-Pierre
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