crystals: HC49/US cans, or cylinders?

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mojojojo
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Posted by mojojojo: Fri. Jun 8, 2007 - 03:44 AM
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I can buy a couple different kinds of non-SMT crystals, and I'm wondering what the practical difference is. Most products seem to use the HC49/US low profile cans. But the cylinders will involve shorter leads on the protoboard, hence presumably less scope for noise and so on. The cylinders will take less space on the board.

These xtals will be 12 MHz, and comparing specs didn't show me any differences of much node ... 18pf, same accuracy in PPM, and so forth.

My question: is there a strong reason to choose one package over the other? Other than the ones I mention, which make me think the cylinder will be better.

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Learning and Information, General Electronics
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c_hirst
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Posted by c_hirst: Fri. Jun 8, 2007 - 06:16 AM
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Most cylinders have to be laid down & stuck to the board to avoid vibration causing wire breakage due to metal fatigue (applies to caps/xtals/inductors etc. - anything that's high off the board)

C. H.
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It's only waste if you don't use it!

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dl8dtl
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Posted by dl8dtl: Fri. Jun 8, 2007 - 09:48 AM
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Yeah, had to replace the crystal in my oldish wrist-watch a few
months ago, for the very same reason: Casio forgot to solder the
cylinder itself to the PCB, so eventually one of the wires broke.

Jörg Wunsch

Please don't send me PMs, use email if you want to approach me personally.

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