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From: N_Cook on 24 Jul 2010 03:07
I'm aware that in some situations TO92 transistors marked C556 mean BC556
(not 2SC556), can the same be for BF...?
I have a board with dozens of BF422, HV transistors on. These agree with the
schematic but someone has previously replaced 2 with a pair marked F422 and
one of them has failed B-C-E short. Diode testing (Vb-c < Vb-e) the
remaining one shows correct pinout for BF422


From: ian field on 25 Jul 2010 16:39

"N_Cook" <diverse(a)tcp.co.uk> wrote in message
news:i2e3d6$hlp$1(a)news.eternal-september.org...
> I'm aware that in some situations TO92 transistors marked C556 mean BC556
> (not 2SC556), can the same be for BF...?
> I have a board with dozens of BF422, HV transistors on. These agree with
> the
> schematic but someone has previously replaced 2 with a pair marked F422
> and
> one of them has failed B-C-E short. Diode testing (Vb-c < Vb-e) the
> remaining one shows correct pinout for BF422


That marking style is fairly common.


From: N_Cook on 26 Jul 2010 09:09
ian field <gangprobing.alien(a)ntlworld.com> wrote in message
news:8i13o.319199$k15.160568(a)hurricane...
>
> "N_Cook" <diverse(a)tcp.co.uk> wrote in message
> news:i2e3d6$hlp$1(a)news.eternal-september.org...
> > I'm aware that in some situations TO92 transistors marked C556 mean
BC556
> > (not 2SC556), can the same be for BF...?
> > I have a board with dozens of BF422, HV transistors on. These agree with
> > the
> > schematic but someone has previously replaced 2 with a pair marked F422
> > and
> > one of them has failed B-C-E short. Diode testing (Vb-c < Vb-e) the
> > remaining one shows correct pinout for BF422
>
>
> That marking style is fairly common.
>
>

I don't remember coming across it before for BF... , a few times I've seen
it with Philips TO92 BC... types


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