Crystal SMD packaging...

[alank2]

Hi Everyone,

Is there a benefit in terms of reliability between a can type crystal modified for SMD, or one that looks like other SMD parts?

http://www.digikey.com/product-detail/en/ABLS-8.000MHZ-B4-T/535-10212-1-ND/2184247
http://www.digikey.com/product-detail/en/NX8045GB-8.000000MHZ/644-1018-1-ND/1128890

Thanks,

Alan

[marshallh]

Have used both with no difference detected in both reflow and hand soldereing

[rob77]

they might have different stability ? according to my experience (talking about cheap xtals) : the smaller the package - the higher the ppm is. but i might be wrong

[theatrus]

You can even get crystals in polymer packages as well, instead of the more usual metal can. The main advantage is cost.

[alank2]

What do you guys think about longevity.  The metal can they've been doing for decades, do you think it is tougher and has a longer mtbf vs the smd style ones?

[SirNick]

I was wondering the same thing recently, since I started looking for SMD equivalents to all the PTH stuff I keep in personal inventory.  Then I started noticing SMD crystals everywhere.  I guess I just didn't notice before because I didn't know what I was looking for.

For e.g., I have a stack of Juniper hardware behind me... router chassisesses, interface cards, routing engine cards, you name it.  There are a ton of SMD crystals on those.

If it's good enough for production telco equipment, it's good enough for me, and probably for you.  I say: Match the part specs to the requirements as usual and sail on.

[dannyf]

Is there a benefit in terms of reliability between a can type crystal modified for SMD, or one that looks like other SMD parts?

I have used both and I don't think there is much difference. The metal can allows you to ground it to minimize emi.