Re: Future: 0603 versus 0402 parts

John Larkin wrote:

On Tue, 13 Mar 2007 21:01:41 GMT, Joerg
<notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote:


Ok, have to decide whether to default to 0603 or 0402 for resistors and stuff on a new design. Wow, this time I am not size constrained.

Looking at Digikey it comes up with 143 pages (has risen) for 0402 resistors and 218 pages for 0603. Looking at prices 0603 still has a leg up, around $0.003 for a 10K while its 0402 counterpart runs about twice that. Is 0603 going to be a good choice for the next years? Or better stick to 0402?

Of course from a debug point of view I hate to deal with 0402. With chips the situation seems to be more clear cut. Things definitely seem to be going TSSOP there.


My production people hate 0402's... they tombstone a lot. We still use
0805's when there's plenty of room, 0603's for tight stuff, occasional
0402's for picosecond stuff where it matters.


Hmm, I never had tombstoning with those. OTOH nearly all my clients contract out circuit board stuffing so they don't have to bother with that. Sometimes even the whole production. Sometimes I have a chat with the contract producers and they'd tell me if they weren't happy with parts of a design. Like when zeners began to miss data sheet limits I had an instant email from China about it.


You can still buy lots of 1206's and 2010's and such. They're not
going away.


Good to know, thanks.


Looks like some parts are appearing only in those drecky
leadless/chipscale packages. Yuk.


I really hate it when there is a cooling pad that must be soldered, on parts that consume less than 20mW. Arrgh. I have begun to shun parts that don't come in TSSOP. Too much trouble. And when they stop the migration path for a part at the SOIC level that is a red flag in terms of remaining product life.

--
Regards, Joerg

http://www.analogconsultants.com
.

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