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TO92 marked F422 = BF422 ?

N

N_Cook

Jan 1, 1970
0
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
 
I

ian field

Jan 1, 1970
0
N_Cook said:
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.
 
N

N_Cook

Jan 1, 1970
0
ian field said:
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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