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  1. #1
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    surface mount diode markings

    I have a shortcircuited (it failed) surface mount component. I'm pretty sure it is a diode.
    Itīs associated to the power supply board area.
    The size of the package (plastic) is 4 x 3 mm (i.e. 160 x 120 mils). Cathode is marked with a line. I believe the package is SMB

    Marks:

    On the top left corner the word "ON" in a circle (this is a logo), to the rigth of this logo 249 and exactly below the "249" is B14


    non code from Onsemi aplies to this diode, but the logo sugest it could be Onsemi...


    Thank you for help me. Itīs saturday night and I'm in a hurry with this stuff.

    •   Alt25th July 2004, 01:32

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  2. #2
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    b14 diode

    249 sounds like a date code.
    I searched ON for "diode marking B14", and found the MBRS140 diode:
    http://www.onsemi.com/pub/Collateral/MBRS140T3-D.PDF

    Hope that helps!



    •   Alt25th July 2004, 07:00

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  3. #3
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    surface mount diode identification

    thanks Echo7! :D

    Nevertheless if you search b14 in the home page of ON Semiconductor you get zener diodes!!!. See yourself: http://www.onsemi.com/site/products/...archString=b14 in SMB packages too.

    Because it is a multilayer board itīs pretty difficult to draw the circuit.

    Edited on July, 30
    Epilog


    The diode was a B14.
    What a mess is to identify a surface mount component identification guys.



    •   Alt25th July 2004, 13:16

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  4. #4
    Advanced Member level 5
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    diode identification

    Search engines!
    I entered "diode marking B14" into the "General" search field at http://www.onsemi.com/
    Hit #5 was the good one.

    Happy troubleshooting. :)



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