Re: Future: 0603 versus 0402 parts

<snip>

One of the problems with a mixed design (where there are also some large
devices on the PCB) seems to be the paste. Too much and you get
tombstoning, too little and the big parts won't solder reliably.


I have never seen this problem, and have produced a lot of boards with a
large variety of parts. Ever see 1206's, 0603's, 0402's, a few 2220
caps,
QFN's fine pitch QFP's and BGA's all on the same board? Or fine pitch
BGA's
with all 1206's? We just did a fairly complex board with 0.4 mm pitch
parts
(those are not nice), tons of 0.5 mm pitch parts including large QFP's,
SOIC's, DPAK's, littered with 1206's a few 0805's and some 0603's. It's
all
in designing the footprints and solder paste stencil correctly.


If enough care is taken, yes, it can work well. Most of my boards are
also rather mixed. The extreme was a board with 0603 on there but also a
DIP because the LM331 doesn't come any other way.


It's common to use dip parts and SMT!




Like
those pellet stoves where they haven't figured out how to automate
intake air. Throttle too high and it'll go out on "1". Throttle too low
and it'll smoke on "3" or higher.


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


Good to know, thanks.


You may not like the price, though.


Actually a 1ohm 1206 costs roughly the same as a 10K in 0402, around
$0.007. A 2010 size can pop to several cents. Still, I don't see a
reason for anything larger than 0603 unless it is in a current sense
path or RF bridge.


See comments in other post! 1206's are about 1.5 to 2 times as expensive
as
an 0603. Don't use Digikey prices for production prices. 1210's are for
specialty purposes, eg voltage / wattage / capacity issues.


I know but Digikey price ratios for reel qties are usually a pretty good
indicator when weighing one technology against another.

I used similar tactics when designing in components. I really like it when
companies include a unit price @ say 1 k on their website - it really helps
when making that part decision. TI has won a few design ins from me, just
from this alone.

Sometimes they
even beat distributor "pre-haggling" prices.


We typically only get that with new suppliers! they quickly learn, or we
don't do business with them. It's typically a problem with the smaller
suppliers, or the brokers that are trying become distributors.

There are a few cases however where in "low volumes" Digikey can't be beat.
Digikey excels at the prototype and low volume stuff, but for anything of
any volume, it's expensive.



--
Regards, Joerg

http://www.analogconsultants.com


.

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