trying to repair my car radio, need some help identifying a surface mount component

Thread Starter

sedemdeh

Joined Nov 18, 2004
11
my camera is busted but I not sure if I could have gotten a clear pic anyway..
the component in question has the markings as displayed in the pic..
I'm not sure if its a transistor or something else and I've tried to search but I don't have much to go on..

any help would be great, I just need to find something comparable
 

bloguetronica

Joined Apr 27, 2007
1,371
my camera is busted but I not sure if I could have gotten a clear pic anyway..
the component in question has the markings as displayed in the pic..
I'm not sure if its a transistor or something else and I've tried to search but I don't have much to go on..

any help would be great, I just need to find something comparable
It is an SMD component, but I can't really guess what it is. Besides the markings, can you see any sequence of characters?
 

Thread Starter

sedemdeh

Joined Nov 18, 2004
11
the circuit controls the lcd display on the radio. the leg on the side that looks like a Q is positive, and I can get the display to work by jumping that positive leg to the center leg..
My problem is that when that is done the radio draw more current even when turned off and could possibly drain the battery..
 

SgtWookie

Joined Jul 17, 2007
22,210
good call on lightingman's part.

If you can't find an MMBT5088, you might be able to use a 2N5088; that's the same transistor in a TO-92 case. I had to do that when I was visiting my folks in July for a week; couldn't find a SMT version of a 2n3904 to fix their cordless phone locally, and didn't have time to wait for one to be delivered. Took some careful lead bending and trimming to make it work, but work it did.
 

SgtWookie

Joined Jul 17, 2007
22,210
There are quite a few tables out there. In the past, standardization of markings was a huge problem, but it's getting better.

Here is a very useful site:
http://www.educypedia.be/electronics/datacomponent.htm

You'll still have "rummaging around" to do, but at least you'll have lots of stuff to look at ;)

One of the really nice things about that site is that it'll give non-ROHS compliant equivalents (that is, parts that may contain lead and other elements heinous to the environment) if available - very handy for those with well-seasoned "treasure boxes"

For example, a quick check shows that MPSA18 is a non-ROHS compliant but otherwise equivalent replacement for the OP's part.
 

bloguetronica

Joined Apr 27, 2007
1,371
There are quite a few tables out there. In the past, standardization of markings was a huge problem, but it's getting better.

Here is a very useful site:
http://www.educypedia.be/electronics/datacomponent.htm

You'll still have "rummaging around" to do, but at least you'll have lots of stuff to look at ;)

One of the really nice things about that site is that it'll give non-ROHS compliant equivalents (that is, parts that may contain lead and other elements heinous to the environment) if available - very handy for those with well-seasoned "treasure boxes"

For example, a quick check shows that MPSA18 is a non-ROHS compliant but otherwise equivalent replacement for the OP's part.
Very good resource! You should put this in the "Electronic Resources" section, if you didn't.

O.K. Fellas (and maybe girlies)..I cheated !!!!.... This is a good site for SMT identification...www.tkb-4u.com/code/smdcode/indexsmdcode.phpSo I don't know every SMT marking of the top of me head..Daniel.
I can't open the link! I think it is malformed. I think this is the link:
www.tkb-4u.com/code/smdcode/indexsmdcode.php

Everyone cheats, but of course, some cheat more (like Bill MS).
 
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