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prevalence of 4 pin crystal chips

K

Kelvin Chu

Jan 1, 1970
0
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
 
T

Tam/WB2TT

Jan 1, 1970
0
Kelvin Chu said:
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
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
 
R

Rich Grise

Jan 1, 1970
0
Here are my guesses:
1. The 4 pin results in using a standard SO package.

That's the one. Standard packaging, pick & place, that sort of thing.
2. They use 4 pins because of the weight.

Cheers!
Rich
 
K

Kelvin Chu

Jan 1, 1970
0
Learn something every day :)

Thanks to both of you!

Kelv
 
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