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prevalence of 4 pin crystal chips

Discussion in 'Electronic Design' started by Kelvin Chu, May 22, 2005.

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  1. Kelvin Chu

    Kelvin Chu Guest

    Hi Group,

    I was ordering parts the other day (well today) and I noticed that there're
    alot of 4-pin crystal chips out there now... indeed, there seem to be more
    of these than the normal 2-pin ones for SMT

    But 2 of the pins are unused anyway...

    I was reading up on it, and it seems that these 4-pin crystals are easier to
    mount using machines, is this the only reason for their prevalence?

    (Searching on Farnell for 32khz crystals)


  2. Tam/WB2TT

    Tam/WB2TT Guest

    Here are my guesses:
    1. The 4 pin results in using a standard SO package.
    2. They use 4 pins because of the weight.

  3. Rich Grise

    Rich Grise Guest

    That's the one. Standard packaging, pick & place, that sort of thing.
  4. Kelvin Chu

    Kelvin Chu Guest

    Learn something every day :)

    Thanks to both of you!

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