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Recommendations on low temperature thru-hole 32768 xtal

Discussion in 'Electronic Basics' started by Bob E., Aug 8, 2003.

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  1. Bob E.

    Bob E. Guest


    I have been looking through catalogues tyring to find an oscillator
    crystal @32.768kHz for use in serial communications timing
    (synchronous, and asynchronous), and real time clock at low
    temperatures (needs a -40 C temperature spec), as well as having low
    power consumption.

    There are several SMT devices that fit the the bill, but all of the
    thru-hole components seem to have a 0, -10, or -20 C operating
    temperature specs.

    Can anyone make some recommendations? Will using an oscillator below
    its operating range be a fatal mistake?

    Thanks for the help,

  2. John Larkin

    John Larkin Guest

    Condensation could be bad news; the Q can be killed by frost. So you
    may need a nitrogen-filled gadget, or the ultimate: Micro Crystals
    makes vacuum versions, but those are surface mount, too. 32K crystals
    usually have a parabolic TC that peaks around room temp, so expect big
    frequency errors.

    LapTech makes truly beautiful, vacuum, glass packaged crystals, but
    only AT cuts in glass HC18 cans.

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