Tuesday 18 April 2017

Does the polarity of this crystal matter?


I am using TXC 7B 16.0 mghz crystal for my design. I just received photo proofs from my PCB assembly house and it appears they soldered this crystal 180.0 degrees reversed.


https://www.digikey.ca/products/en?keywords=887-1104-1-NDdiagram


Edit: the real datasheet



Answer




No, the polarity does not matter.


Crystals do not have a polarity.


Watch out with Crystal oscillators in a similar housing though (also 4 pins) as their polarity does matter.


But since this is a crystal only (no oscillator) polarity does not matter. It will work mounted either way. I speak from experience with similar crystals from the same manufacturer.


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