[sdiy] 2n3904 transistor matching stats

Pete Hartman pete.hartman at gmail.com
Wed Jun 8 05:30:20 CEST 2016


They aren't matched for Hfe anyway.

Pete

On Tue, Jun 7, 2016 at 9:04 PM, Michael E Caloroso <
mec.forumreader at gmail.com> wrote:

> Hfe and other parameters can't be controlled during the fabrication
> process.  There is no way that a series on the same tape will be
> matched.
>
> MC
>
> On 6/7/16, Pete Hartman <pete.hartman at gmail.com> wrote:
> > I haven't noticed, but I haven't done rigorous checking either
> > On Jun 7, 2016 4:18 PM, "Mike Beauchamp" <list at mikebeauchamp.com> wrote:
> >
> >> On 06/07/2016 07:12 PM, Pete Hartman wrote:
> >>
> >>> I've found that transistors on a tape almost always have very close
> >>> matching between adjacent devices.  To the point where I only bother to
> >>> check if I have some other reason to want them to be extra precise
> (e.g.
> >>> If I'm building for someone other than myself)
> >>>
> >>
> >> Did you ever notice any that weren't matched?
> >>
> >> These were just ordered in a loose bag, so maybe the outliers were from
> a
> >> different manufacturing run.
> >>
> >> Mike
> >>
> >
>
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