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Thermistor ID

Discussion in 'General Electronics Discussion' started by Dpc5, Apr 3, 2016.

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  1. Dpc5

    Dpc5

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    Apr 3, 2016
    I want to repair a Bose PS51, it appears that the thermistor exploded the numbers on the part were PTC C850 9451. There appears to be several references C850 thermistors, but different temps referenced. Not sure what the 9451 references. Finally any suggestions on sourcing - thanks for any help.
     
  2. AnalogKid

    AnalogKid

    2,375
    661
    Jun 10, 2015
    What is a Bose PS51?
    How old is it?
    Which thermistor?
    In what part of the device is the failed thermistor located?
    Did it split down the middle or fly apart?
    What shape was it before it failed?
    What color was it before it failed?
    Are the leads staggered or inline?
    Is there a logo on the part?
    How big is it?
    Photos-?

    9451 could mean the thermistor was manufactured in late December, 1994. That makes your device over 20 years old. Is this even remotely possible?

    http://www.epcos.co.jp/inf/55/db/PTC/PTC_OC_Leaded_230V_C850_C883.pdf

    ak
     
  3. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    Welcome to EP.
    You have a PTC ,it is used in the input (mains circuit) for over-current protection.
    It exploded because of an over-current condition (possibly a short ,check that this isn't the case).

    If your unit is 110V the part you probably need is:
    TDK(EPCOS is a part of them nowadays) B59850C0160A070
    It is rated at 250mA .
    The 9451 is the date code
     
  4. Dpc5

    Dpc5

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    0
    Apr 3, 2016
    Thank you dorke, I will give that a try!
     
  5. Dpc5

    Dpc5

    4
    0
    Apr 3, 2016
    Dorke sorry to bother you again - can steer me in the right direction on sourcing? Thanks
     
  6. Dpc5

    Dpc5

    4
    0
    Apr 3, 2016
    1990's
    ptc c850 9451
    next to the transformer
    broke in half across
    round
    Blue
    inline
    no logo
    3/4 in diameter
     
  7. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    You can find the part (may be hard to get just one) at:
    digikey
    Mouser
    octoPart

    Make sure you know why the part blew before you replace it.
    No short circuit or other defective device.
     
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