Author Topic: Will Itead be able to manufacture PCB with a .5mm pitch 100 pin QTFP footprint?  (Read 3596 times)

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Offline jabramoTopic starter

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I'm starting a design for a new project using a bunch of 100 pin .5mm pitch pic32mx460's in a TQFP package that we were throwing away at work.

I was hoping that I could use Itead or Seeed to manufacture my boards because the fab we use for prototypes at work would charge 100+ bucks per piece!

Has anyone designed a board with a .5mm pitch? I've been searching online for peoples experiences but so far I haven't found anything conclusive.

I don't care if the yield isn't 100% working. I have 6 or 7 chips and apparently Itead will send you 12 if you opt for the open source option so 75% working yield would be good enough (I know desoldering each chip will be a pain but it still beats paying 100 bucks a board).

I don't really want to waste my time designing only to get 1 or 2 working boards when I need 6 or 7... Also it'd be a waste of 50 bucks.

Edit: I may be wrong about get shipped 12 boards. Rather they make 12 and send 2 out to random people and you get 2 random boards from other people. If anyone could confirm that'd be great :-+
« Last Edit: November 09, 2013, 03:28:02 am by jabramo »
 

Offline Hideki

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0.5 mm QFP. Yes, several times and I never had a problem. Make sure you have at least 0.1 mm of solder mask between the pins or they may simply remove the thin lines.

Even 1 mm BGA is possible. 0.8 mm not so much, because the minimum hole size is 0.3 mm, which leaves little room for the annular ring.
 

Offline Dago

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0.5mm pitch TQFP is nothing special and every PCB fab house should be able to make a PCB for that kind of package, even chinese ones...
Come and check my projects at http://www.dgkelectronics.com ! I also tweet as https://twitter.com/DGKelectronics
 

Offline Hideki

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You get two random boards from other people. Not 12 of your own boards.
 

Offline M. András

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well i got 22 boards instead of 20 from seed none of them marked bad. i will check them when i assemble it
 

Offline Dago

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They sometimes send extras, I've even gotten 14 instead of 10. I guess it has something to do with panelization or something and they sometimes have extras left over.
Come and check my projects at http://www.dgkelectronics.com ! I also tweet as https://twitter.com/DGKelectronics
 

Offline poorchava

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I've gotten extras on multiple occasions too. I think they simply run a few boards more in case some of them have manufacturing faults. If they made the exact number you've ordered and one would be faulty, then they would have to re-run the process. This ways they have a safety margin. Since boards are useless to them they simply send them too :).
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