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TO92 marked F422 = BF422 ?
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N_Cook
Jul 24, 2010, 3:07:35 AM7/24/10
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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
(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
ian field
Jul 25, 2010, 4:39:31 PM7/25/10
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"N_Cook" <div...@tcp.co.uk> wrote in message
news:i2e3d6$hlp$1...@news.eternal-september.org...
That marking style is fairly common.
N_Cook
Jul 26, 2010, 9:09:11 AM7/26/10
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ian field <gangprob...@ntlworld.com> wrote in message
news:8i13o.319199$k15.160568@hurricane...
news:8i13o.319199$k15.160568@hurricane...
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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