Help identifying a 1383 transistor

[sausage]

I had a newish phone base station blow during a storm. Looking at the TO92 transistor near the RJ45 socket, it took the brunt of the impact and parts of the transistor blew off along with some of the numbering.



The parts I can still read are:

*R
*94
1383

Things I have done:
1. Tried to duckduck 1383 but all results come back with C1383 and I am not sure if this is a similar part.
2. Used https://alltransistors.com/search.php?search=1383 to find an alternative part for a 1384 TO92 (avoiding the C1383 entries in the list)

I end up with no definitive result.

Would anyone have any ideas here?

[wraper]

May be some clone of MPSA94. However normally there should be a quite high voltage present to justify its use.

[sausage]

Thanks, wraper. A possible justification could be for lightning strikes that come up the phone line? We lose a phone or modem a year out here. Would that provide some protection at that rating?

[fzabkar]

Trace the circuit in the vicinity. That will at least tell you if it is NPN or PNP.

[abdulbadii]

might do hard works

- desolder it
- meter it to determine E C B
- then determine polar type, npn or pnp
- reverse engineer the area close to Q schema
- thence might conclude the Q function/characteristic

[PKTKS]

May be some clone of MPSA94. However normally there should be a quite high voltage present to justify its use.

MPSA94 is vintage Motorola plastic case.. for Darlingtons and some mid power types

The best clue is the "R" above which should be a manuf. indicator..

Unfortunately there are way too much combinations for the last 2 digits..
with 3 or 4  numbers... 4 would be a guess for a 2N class.
and 3 if so there is the missing letter to the JIS - best shot if PNP/NPN  AB/CD..
( 2SAxxx or 2SCxxx )

any case just the lasting 2 numbers are not enough for a wild guess...

Paul

[Haenk]

Honestly, at that position I don't think it has any critical specs to be met (other than voltage).

[SoundTech-LG]

2SC1383 was an extremely popular JIS transistor late 70s through the 90s. Note the larger case though. Not sure if they also produced some in the smaller TO-92 style cases.

[PKTKS]

2SC1383 was an extremely popular JIS transistor late 70s through the 90s. Note the larger case though. Not sure if they also produced some in the smaller TO-92 style cases.

That makes sense...  for such a vintage Mitsubishi
THE  "R"  suffix  for the  JIS is the tolerance class...
R - red
O - Orange
B - Blue

usually hfe and other stuff

[BrokenYugo]

MPSA94 makes some sense, telephone dialing is is the suggested use on the first datasheet I found. Reverse engineer enough to see if a PNP with EBC pinout makes sense there.

[sausage]

Thanks everyone for your insight. Clearly a multimeter test is too late for this poor little transistor, but I am tracing the area on the board (a mud map) and will post up.

[Jeff eelcr]

The letter code following the part number on all japanise transistors is the gain group. It makes matching transistors in audio equipment easy (just by looking). An A with no space after the part number is a part revision, not a gain group which would have a space after the A most will be like Q, R, S and T.  I do not remember the hfe these equeate to, it may be different for different transistors. I have never seen a 2SC1383 in a TO-92 case style.
Jeff

[Wallace Gasiewicz]

How about this:

Assume it is an ECB pinout transistor

Turn the unit on
Test the pins with a voltmeter
If pin #1 is positive, it is a PNP
If pin #3 is pos it is an NPN

Probably just a switching or low freq transistor. Put one in and see if it works.

[DavidAlfa]

might do hard works

- desolder it
- meter it to determine E C B
- then determine polar type, npn or pnp
- reverse engineer the area close to Q schema
- thence might conclude the Q function/characteristic

Really? How to you measure a blown transistor?

[wraper]

Really? How to you measure a blown transistor?

If its not totally destroyed (probably it is due to explosion), one of the junctions may still measure fine and you could determine if its npn or pnp.

[DavidAlfa]

Have you seen the 1st post picture?

[SpecialK]

KSP94 - 400V PNP?

[wraper]

Have you seen the 1st post picture?

Are you able to actually read the post?

If its not totally destroyed (probably it is due to explosion)...