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the effect of ice on electronics

Discussion in 'Electronic Design' started by [email protected], Apr 3, 2006.

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  1. Guest

    I'm designing a product that involves freezing of every day car keys.
    The keys that will be frozen are obviously likely to include
    electronics.

    Are there any components inside modern day electronic keys that are
    likely to be damaged by freezing?
     
  2. Luhan

    Luhan Guest

    Last I heard, the only electronic component in car ignition keys was a
    resistor. Unlikely to be damaged by freezing.

    Luhan
     
  3. Robert Baer

    Robert Baer Guest

    Yes and no.
    The semiconductors, resistors and PCB can withstand -55C, the
    capacitors might do that also; the stresses between parts mounted on the
    PCB and the board itself may be too great.
    However, the worst part is the *moisture*, which may cause problems
    by creating conductive paths.
     
  4. Ian Stirling

    Ian Stirling Guest

    It's been a while, I suggest you check again.
     
  5. Ian Stirling

    Ian Stirling Guest

    Err, why?
    Anyway.
    Define 'frozen'.
    Presence or absence of water.
    Pressure.
    Cycles?
     
  6. Joerg

    Joerg Guest

    wrote:


    Will Usher? Hey, we still need one more usher during Easter at church
    :) (SCNR)

    I'd watch the battery. Many of them don't like too deep of a freeze.
    Electrolytic capacitors are another concern but I doubt there are any in
    the body of a car key.

    Regards, Joerg
     
  7. Luhan

    Luhan Guest

  8. At least mine has a button which opens the
    car remote. This is not doable with just a
    resistor.

    Rene
     
  9. Ian Stirling

    Ian Stirling Guest

    You'll notice that it refers to one specific brand of car.
    Most recent cars use some sort of RF ID in the key.
    This is of various sophistication, from a simply key that only
    broadcasts one unchanging number, when it's queried by the car, and can
    be fairly easily copied (but costs under $1 to buy in bulk), to keys
    that can unlock the car at a distance, start the engine, and act as a
    nifty remote control, with integrated display.
    (oops, the last two bits were James Bond)
     
  10. EE123

    EE123 Guest



    When I worked for Ford, we had situations where PCB boards (FR 4) had
    cracked due to temperature cycling - above freezing, then below.
    This cycling would occur several during the day as the car would start
    cold, warm up, cool down, turned on so the car would warm up, cool down
    etc.

    Good Luck,
    Dave
     
  11. EE123

    EE123 Guest



    When I worked for Ford, we had situations where PCB boards (FR 4) had
    cracked due to temperature cycling - above freezing, then below.
    This cycling would occur several during the day as the car would start
    cold, warm up, cool down, turned on so the car would warm up, cool down
    etc.

    Good Luck,
    Dave
     
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