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qasim424
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Join Date: Jan 2014
Posts: 3

SMD Transistor Code

01/07/2014 12:03 PM

I have 02 SMD Transistors which have Code;

1) SIs

2) V1P

But i didn't get its actual part number, can anybody help me in finding actual part number of these transistors.

Awaiting for the positive response ....
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dj95401
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#1

Re: SMD Transistor Code

01/07/2014 7:54 PM

Have you tried doing any internet searching on your own? Try typing in the info you have posted here, you might be surprised by what you find.

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qasim424
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#2
In reply to #1

Re: SMD Transistor Code

01/07/2014 11:27 PM

I have search a lot but i didn't find any information on internet, can any body has detailed file of smd transistor.
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Randall
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#3

Re: SMD Transistor Code

01/08/2014 5:44 AM

What sort of packages are they in

according to ecadata.de both are 5 pin devices (not transistors).

SIs is an AS1917S

V1P is an R3119N036E

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qasim424
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Posts: 3
#4
In reply to #3

Re: SMD Transistor Code

01/08/2014 1:24 PM

they are SOT23 and they are mosfet becuase i have schematic of circuit on which these transistors are used and by multimeter i have checked there switching by applying gate pulse, but i am unable to identify the actual part number of these transistors for reference i have attached the snap shot of this transistor.
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Randall
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#6
In reply to #4

Re: SMD Transistor Code

01/09/2014 5:56 AM

Have you got a good magnifying glass or a better camera.

I think that might be STs

an Infineon BSS139

A good picture of the V1P might help.

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Carl Van Wormer
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Join Date: Mar 2012
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#5

Re: SMD Transistor Code

01/08/2014 4:54 PM

My experience with this question will not make you happy. The manufacturers "top mark" codes are not consistent. For instance, the common 3904 SMT transistor from Diodes Inc. is marked with K1N (plus date code), NXP marks a 7A (plus a country code), and ON Semi marks with a 1AM (plus a date code). The only thing I've been able to use them for is to make sure a bunch of parts that are supposed to be the same are probably the same (assuming the batch of circuit boards was made with parts from only one vendor). This is the problem with tiny parts. You will probably have to have somebody who is good at circuit troubleshooting guess a valid substitute.

Good luck!
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ci139
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Join Date: Feb 2012
Posts: 595
#7

Re: SMD Transistor Code

01/10/2014 9:31 AM

http://www.s-manuals.com/smd/s1
http://www.s-manuals.com/smd/v1
https://docs.google.com/file/d/0ByNvoX1GE59_ZEtoRFBzSDBSOGlPbElNTmUyZW00Zw/edit?pli=1

(as mentioned already) STs N-SIPMOS // BSS139

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