prevalence of 4 pin crystal chips

May 22, 2005 3 Replies
K

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)



Thanks



Kelv


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R

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

Cheers! Rich

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T

Here are my guesses:

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

Tam

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K

Learn something every day :-)

Thanks to both of you!

Kelv

more

easier

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