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Need help Identifying a TVS diode

Discussion in 'General Electronics Discussion' started by mharrouchi, Apr 19, 2019.

  1. mharrouchi

    mharrouchi

    2
    0
    Apr 19, 2019
    Hello everyone

    I had a power surge on my vehicle which caused one of the TVS diodes on my PCM to blow up.
    I must replace it in order to get the vehicle to start again but so far I have been unsuccessful to figure out which one of the many models I should get.
    All I know is that this Diode is unidirectional and has the number 14 and 37 written on it (on top of each other).
    The vehicle is an 02 Dodge Ram Van 3500 with a 5.9L V8
    Does anyone know what those numbers mean? And would it be Ok to if I get a replacement diode with a slight difference in specs?

    Thank you all

    PS: The image is of a similar Diode on the same circuit board.
     

    Attached Files:

  2. Martaine2005

    Martaine2005

    2,233
    604
    May 12, 2015
    That looks pretty catastrophic.
    The numbers don’t appear to reveal any satisfactory results. It’s possible they are either in-house codes or date codes ie 14 (2014) and 37 being 37th week.
    If it was my vehicle, I would replace it with any or jump it temporarily to get my vehicle going. But I would check that there were no other components damaged by the surge first.

    Martin
     
    mharrouchi likes this.
  3. mharrouchi

    mharrouchi

    2
    0
    Apr 19, 2019
    Thank you Martin. I was told by a company that make similar type of diodes for automotive that they’re called surface mount TVS diodes and they believe that the first number referring to the incoming voltage from the alternator (which is 14 in my case) and that the 37 is possibly the Clamping voltage, however they did not have anything like that (the closest was 14/35.5).
    I’m going to replace it with that and see what happens.
    Thanks again.
     
  4. Martaine2005

    Martaine2005

    2,233
    604
    May 12, 2015
    That is interesting what you found out. If it’s correct, the only difference will be 1.5 volts so your pcm will live again!.

    Martin
     
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