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Service manuals & datasheets => LCD TV forum => Topic started by: Turnip on October 17, 2011,09:37:37

Title: Semiconductor codes
Post by: Turnip on October 17, 2011,09:37:37

Hi folks,

Got what looks like a standard NPN SM transistor coded W1A - any idea what it is  ?  Thanks - Chris.

Title: Re: Semiconductor codes
Post by: AGC on October 17, 2011,11:03:50

Hi
You no show type case.It is very significant.
Usually index W- made in China.

Title: Re: Semiconductor codes
Post by: Turnip on October 17, 2011,11:31:18

Hi AGC and thanks,

What you suggest accounts for my problem - will attach a picture - Semi in question Q28

Many thanks - Chris.

Title: Re: Semiconductor codes
Post by: Keith on October 18, 2011,04:44:30

Hi Chris,

If the one next to it measures like an NPN you could try a general purpose BC846 or BC847.

Keith

Title: Re: Semiconductor codes
Post by: Turnip on October 18, 2011,07:49:36

Hi Keith and thanks,

Gather it's equivalent to 2N3904 - thanks again - Chris.

Title: Re: Semiconductor codes
Post by: AGC on October 18, 2011,11:23:19

Look this site, it convenient for search.
 http://www.ecadata.de/suchneu/such.php?F_SPRACHE=2&DATASHEET=casenorm&F_JEDEC=all&F_SEARCHFOR=JEDEC&PATH=/ddv/jedeccreatelist.php
 Example for you transistor with marking W1A:
 http://www.ecadata.de/suchneu/such.php?F_SPRACHE=2&DATASHEET=casenorm&F_JEDEC=all&F_SEARCHFOR=JEDEC&PATH=/ddv/jedeccreatelist.php

Title: Re: Semiconductor codes
Post by: AGC on October 18, 2011,11:34:01

Not correct second address.
Need mark in sector "SMD-Code".

Title: Re: Semiconductor codes
Post by: Keith on October 20, 2011,03:50:33

Hi Chris

2N3904 isn't smd, I'd try a BC846, and stand back :)

Keith

Title: Re: Semiconductor codes
Post by: Turnip on October 22, 2011,12:58:59

Hi Keith,

You're right of course, could have been a 2N3904U (SMD) admit wasn't my problem transistor but for a Quuq chap with Megmeet MLT668 troubles - now well sorted - we hope - Chris