[sdiy] Matched Transistor Specs

Miles Stevens milesstevens89 at gmail.com
Tue Sep 1 10:24:48 CEST 2020


My experience with dual transistors is mainly the NXP BCM series, they are
incredibly handy for tight layouts in general, but I don't find them up to
snuff for an expo pair.

On Tue, 1 Sep 2020 at 14:50, Aa Bb <alfa.rpar.as at gmail.com> wrote:

> Dear Aaron
>
> For exponential circuit must be used transistors for wich some parameters
> (H21,...)  are defined in conditions Ucb=0 V.  Number of available
> transistors for such purposes is small.
>
> On Tue, 1 Sep 2020, 01:23 Aaron B., <aaron at zadzmo.org> wrote:
>
>>
>> I've been looking at dual transistors for exponential circuits. If I'm
>> okay with surface mount, there seems to be a bewilderingly large number
>> of parts available.
>>
>> Besides the maximum voltage/current ratings, what should someone look
>> for in a good exponential converter pair? Do any of the typically
>> published specs like Vceo, Is, beta, etc matter much in this use case?
>>
>> --
>> Aaron B. <aaron at zadzmo.org>
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