B & O transistor from about 1985

[N Cook]

From a Beocenter 2100, type 2442 , TR7 in the ps for the protection circuit/
output relay driver circuit, but I don't have the manual for this one.
It is between TO92 and E-line, slightly smaller than TO92 with a small flat
on the curved surface
It in pnp , marked
115
4XF
so not BC115 or 1154
or 2SB115 or 1154
Would it be short for B&0 number sequence preceding with 8320 so 8320115 ?
and 4XF as date/batch code for 1984 perhaps

 

[Eeyore]

From a Beocenter 2100, type 2442 , TR7 in the ps for the protection circuit/
output relay driver circuit, but I don't have the manual for this one.
It is between TO92 and E-line, slightly smaller than TO92 with a small flat
on the curved surface
It in pnp , marked
115
4XF
so not BC115 or 1154
or 2SB115 or 1154
Would it be short for B&0 number sequence preceding with 8320 so 8320115 ?
and 4XF as date/batch code for 1984 perhaps

Any reasonably specified general purpose TO-92 type should be a perfect
substitute.

Graham

 

[Tim Schwartz]

From a Beocenter 2100, type 2442 , TR7 in the ps for the protection circuit/
output relay driver circuit, but I don't have the manual for this one.
It is between TO92 and E-line, slightly smaller than TO92 with a small flat
on the curved surface
It in pnp , marked
115
4XF
so not BC115 or 1154
or 2SB115 or 1154
Would it be short for B&0 number sequence preceding with 8320 so 8320115 ?
and 4XF as date/batch code for 1984 perhaps

Nigel,

This sound suspiciously like a 'digital switching transistor' which is
usually just a bi-polar device with built in resistors. For example, a
DTA115 (pnp) or a DTC115 (npn). You can do a google search on either
number, or try www.alldatasheet.com and try either number to see if they
are similar to what you are looking for.

Unfortunately, this type of device seems to have become quite popular
in recent years, and they are so small that the full number is not
marked on them. Also it is hard to know which series of device you have
from looking at them, as each manufacturer seems to have its own
numbering system.

Regards,
Tim Schwartz
Bristol Electronics

 

[N Cook]

Nigel,

This sound suspiciously like a 'digital switching transistor' which is
usually just a bi-polar device with built in resistors. For example, a
DTA115 (pnp) or a DTC115 (npn). You can do a google search on either
number, or try www.alldatasheet.com and try either number to see if they
are similar to what you are looking for.

Unfortunately, this type of device seems to have become quite popular
in recent years, and they are so small that the full number is not
marked on them. Also it is hard to know which series of device you have
from looking at them, as each manufacturer seems to have its own
numbering system.

Regards,
Tim Schwartz
Bristol Electronics

Its that sort of size but about half the transistors in this music centre
are of that size so unlikely.
Also that one and the others check out "double diode" test with DMM as
normal pnp transistors.
Agreed any old, correct pinned, 30 to 100mA Ic pnp TO92 would do but I would
like to establish some sort of generality

The other ones npn etc, in this unit, of this small format, are lablelled
603 and M21 instead of 115.
Looking in the Beocenter manuals that I have, I cannot see this package in
the the gallery of transistor packages used in those units.

Perhaps they were a Danish manufacturer of mid 1980s

 

[Eeyore]

This sound suspiciously like a 'digital switching transistor' which is
usually just a bi-polar device with built in resistors. For example, a
DTA115 (pnp) or a DTC115 (npn). You can do a google search on either
number, or try www.alldatasheet.com and try either number to see if they
are similar to what you are looking for.

Unfortunately, this type of device seems to have become quite popular
in recent years, and they are so small that the full number is not
marked on them.

Usually the number is there but the DTA/C isn't.

Graham