Decoupling capacitors size 0402 or 0603

Technical discussions around xCORE processors (e.g. General Purpose (L/G), xCORE-USB, xCORE-Analog, xCORE-XA).
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octal
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Decoupling capacitors size 0402 or 0603

Postby octal » Tue May 03, 2011 6:17 am

I have seen that the decoupling capacitors have to be as close as possible from the XMOS chip package (with short path to ground condition).
Does it "really" matter if we replace the 0402 decoupling capacitors with 0603 ones?
ale500
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Postby ale500 » Tue May 03, 2011 8:13 am

0603 are small enough as to be put really close, imho. and they are easier in the (my) eyes !
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Andy
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Postby Andy » Tue May 03, 2011 12:51 pm

Yep, 0603 are fine... 0402 are bit of a pain.
Corin
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Postby Corin » Tue May 03, 2011 1:11 pm

Personally I find 0402 are not too bad to solder... although you have to remember to not sneeze when fitting them!

If it's for an L2 - we recommend 0402, otherwise 0603 should be fine. With a L1-48 I found it easier with 0402, as I was space constrained.

Cheers,
Corin
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octal
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Postby octal » Tue May 03, 2011 1:14 pm

Corin,
the problem is not with prototyping. I can solder them. The problem is that the factories I found (chineese) that accept to do assembly for little quantities of boards have a lot of problems and defects when they deal with 0402. So I try to use the biggest parts possible to avoid diving in infinite problems (I think you understand how contracts and work goes with chineese companies ;) ).

Regards
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leon_heller
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Postby leon_heller » Tue May 03, 2011 5:15 pm

I saw some 01005 resistors on a Siemens stand at a show a couple of years ago, they really are small. They look like dust particles!
vanjast
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Postby vanjast » Tue May 03, 2011 11:26 pm

There are different quality grades when dealing with china, and in the end good quality is the same price domestically - you choose :D
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octal
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Postby octal » Tue May 03, 2011 11:47 pm

vanjast wrote:There are different quality grades when dealing with china, and in the end good quality is the same price domestically - you choose :D
The problem is that you can'y easily find factories that does assembly at affordable prices here in France :(
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leon_heller
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Postby leon_heller » Wed May 04, 2011 10:27 am

We have one or two here in the UK which you could use. ASK Technology is excellent for prototypes, and their charges are reasonable:

http://www.asktechnology.co.uk/

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