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

Mattias Rickardsson mr at analogue.org
Tue Jan 14 16:09:31 CET 2014


It just says "Dual Transistors", not "Matched Transistors"... and the
"matching" data is probably just an indication of what differences to
expect, not that they have been matched. :-)

/mr

PS: Tom B, thanks for the mineral water, hope you had a safe journey. ;-)


On 14 January 2014 15:48, 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.
>
>
> 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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