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NEED HELP!! Cant find this little part

Discussion in 'Troubleshooting and Repair' started by adam_lumpkins, Oct 11, 2015.

  1. adam_lumpkins

    adam_lumpkins

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    Oct 11, 2015
    It is a 6-pin device, for a SMPS out of a battery charger
     

    Attached Files:

  2. Martaine2005

    Martaine2005

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    May 12, 2015
    Hi Adam,
    It could be an AP3103 sot23-6 package.
    The datasheet is here.
    Might not be though too....

    Martin
     
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  3. adam_lumpkins

    adam_lumpkins

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    Oct 11, 2015
    Thank you for the reply!! but the one in question has 160 v on the input and that one looks like it is rated for 30
     
  4. dorke

    dorke

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  5. 73's de Edd

    73's de Edd

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    Aug 21, 2015
    .
    Sir Adam . . . . .

    With that high of a voltage being across it and if it is close to the AC line portion of the unit.
    The dee-vice it might be a VISHAY SCMG150 "Transzorb" Transient voltage suppressor, as they also offer
    it in a gull wing package, with it being marked as GHL.

    To confirm, you might lift it out of circuit and test by using a variable source of up to 200VDC, with its + lead then being voltage and current limited thru a 1 meg series resistor.

    That makes a non destructive test set up and then you use a DVM to read the/any avalanche voltage thus being presented by the device.

    Its middle of the road crunch voltage is 150V.

    I like to raise the voltage in progressive 25V increments, while being constant DVM monitored, and THEN touch the device into circuit.
    That manner lets you see the PREEECISE engagement of its initial voltage clamping action .


    Here is its Da-Da sheet:

    On Chapter Two . . . Verse 126
    http://images.vishay.com/books/VSE-DB0002-1102_Transient Voltage Suppressors_INTERACTIVE.pdf





    73's de Edd



    .
     
  6. dorke

    dorke

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    Jun 20, 2015
    Edd,
    No way,100% it is not a Transzorb(all of them have only 2 pins - look at page 16) !!!

    Adam,
    don't try what Edd suggested!
    If you do, you may end up with a burnt IC ...
     
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  7. davenn

    davenn Moderator

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    agree with dorke on that one

    Edd, you seem a long way off base on that advice


    Dave
     
  8. Martaine2005

    Martaine2005

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    May 12, 2015
    I think The OP needs to zoom out on his board picture to see other components around it.
    Also, it would be good to find out how the OP knows it has 160v on the input.

    Martin
     
  9. 73's de Edd

    73's de Edd

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    Sirs . . . . . . .Oh . . .Please forgive me . . . . .for I have sinned . . . . .

    Yeah, definitely DON'T YOU EVAH DO DAT.

    But that simply and diabolically clever procedure is JUST fine if you ever want to do a NON DESTRUCTIVE
    PIV test on an unknown diode, Transzorbs, zeners or VCBO junctions of bipolar transistors.


    I was merely looking thru all my SMD codes but there is one different manufacturer
    supplier that offers a variant of this in gull wings.

    But your tiny supplied photo shows the different 6 paths that the IC's leads route to.

    The mentioned 160 VDC present is going to be the power for the switched FET, with
    the chip voltage probably being dependent upon a series resistor to its VCC and a zener
    clamp inside the chip.

    Looking back to the photo a close up covering more area would be a help to pinpoint nearby ancillary devices used.
    That photo was only good for one SMD 100? resistor.


    I see no similarity of BCD's and the very distindtive Diodes logo . . .

    but with the clearer RIGHT logo of these two 5V regulators , doesn't that seem to be the logo used on the chip, or
    can you use a magnifier . . . . .Adam . . . to verify on your unit.

    To me it certainly looks like an open bottomed triangle, with a reversed "comma" dropping down.

    It's Logo a looka-like-a dis:


    [​IMG]

    Origin at:
    http://i01.i.aliimg.com/wsphoto/v0/1676466129/Original-AS7805A.jpg


    73's de Edd



    .
     
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  10. Martaine2005

    Martaine2005

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    Yes, definitley the correct logo Edd.

    [​IMG]
     
  11. dorke

    dorke

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    A picture worth a thousand words:

    BCD LOGO.jpg
    The site is no longer active=it is part of Diode now
     
    Martaine2005 likes this.
  12. dorke

    dorke

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    Just to clarify,
    the above link is just for showing where the Logo came from ......
     
  13. Arouse1973

    Arouse1973 Adam

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  14. davenn

    davenn Moderator

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  15. Arouse1973

    Arouse1973 Adam

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    Duh, missed that......What a gimp.... Sorry Martin! :)
     
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  16. Martaine2005

    Martaine2005

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    Never mind darling.
    HOW? It was the first!!!!!!
    :) Thanks Dave..
     
  17. davenn

    davenn Moderator

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    hahaha its all good .... I do that sort of thing all the time ;)
     
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  18. Arouse1973

    Arouse1973 Adam

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    I think I had one eye shut while picking my nose sweet pea!
     
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  19. Martaine2005

    Martaine2005

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    How can you even think of peas while picking your nose? Never mind, END of story.
     
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  20. 73's de Edd

    73's de Edd

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    .


    Sir Adam . . . . .


    For what help it might be, here is a internal function layout of the BCD AP3103K family and its typical
    application circuit at the left and your possible PCB foil circuit tie in at the top.
    Confirm if your found 160 VDC was to that pin 5.
    Confirm the pin 6 ending up at the Power Mosfets front yard gate.
    Confirm the pin 2 ending up at an optical isolator and its adjunct XX431.
    Only a timing resistor being connected to pin 3.

    The Kay Extension Electronics supplier has referred to that GHL as being their AP3103 product.
    With parts in stock.

    Moresonevernosomewhatever . . .their customer relations department will definitely woo you with their :

    " To protect your interests, your online transactions, precious baby, please use Alipay ."

    Thasssittt. . .

    Referencing :
    (Clickee-clickee make-a Bigga -bigga )
    [​IMG]


    BTW what is this end products brand and final voltage and current output from any relevant labeling on it ?

    Pee Ess . . . .Sir Arouse1973 . . .please expect absolute minimal consequential effect from your . . . . .
    " Duh, missed that......What a gimp.."
    Since you didn't experience a monumental gimp . . . a . . . la . . . . my initial # 5 post above.

    73's de Edd


    .
     
    Last edited: Oct 12, 2015
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