wat r the causes of transistor failures?

Discussion in 'Homework Help' started by appoos, Sep 18, 2006.

  1. appoos

    Thread Starter Member

    Sep 18, 2006
    12
    0
    wat can cause BJT,MOSFET failures?
    for me all the time MOSFET is failing an hour.
    wat cud b the problem?
    ESD (static charge) ll affect it very much?
     
  2. Gadget

    Distinguished Member

    Jan 10, 2006
    613
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    Please supply a circuit, values, load, supply, and any other circumstances
     
  3. appoos

    Thread Starter Member

    Sep 18, 2006
    12
    0
    its just a switching circuit..
    out put is goin to a motor drive..details i donno..
    wat are all the general cases of failures?
     
  4. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Greetings appoos,

    There are many scenarios that could potentially be causing your failure. I agree with gadget. Without a diagram of the section of circuitry that is failing it is difficult to narrow down the cause.

    hgmjr
     
  5. appoos

    Thread Starter Member

    Sep 18, 2006
    12
    0
    anyways plz post some docs abt things that can cause failure..
    plz
    or lemme know abt the scenarios..

    thanks
    appoos
     
  6. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    If this is for an assignment, we would be happy to relocate the thread to the "Homework Help" forum.
     
  7. appoos

    Thread Starter Member

    Sep 18, 2006
    12
    0
    ok u can relocate..
    but u ddnt give any datas...
    plz
     
  8. mozikluv

    AAC Fanatic!

    Jan 22, 2004
    1,437
    1
    i think the circuit is an H-bridge

    moz
     
  9. appoos

    Thread Starter Member

    Sep 18, 2006
    12
    0
    that i donno..
    but wat are the possibilities?
    any docs?
     
  10. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    3,280
    1,070
    Post your circuit and the readings you've taken so far.

    Otherwise, the failure analysis for individual components can be opens, shorts, leakage ... caused by exceeding component specifications which could include just about anything up to a nearby lightning strikes travelling through the earth connection.

    You can visit the microwave mortuary and see some examples of component failures at http://www.microwaves101.com/content/microwavemortuary.cfm
     
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