Electronics Forum: 16 mil pitch csp stencil opening (Page 1 of 20)

Re: 16 mil pitch QFP solder bridge

Electronics Forum | Sat Oct 07 16:31:56 EDT 2000 | Elfego

Tray the electroform stencil.

Re: 16 mil pitch QFP solder bridge

Electronics Forum | Sun Oct 08 00:18:05 EDT 2000 | Arturo

We are working with a 16mil TSOP Land width=0.2mm(8mil) and use: 1.Type 4 particle size solder paste. 2.Laser cut electropolished stencil: Aperture width=0.19mm (we tried lower than this but had solder insufficiency). Thickness=0.005"(130 microns)

Re: 16 mil pitch QFP solder bridge

Electronics Forum | Tue Oct 10 20:14:01 EDT 2000 | Dason C

Hi! CJ. Please advise what is your pitch size ie 15.7 mil or what is your capabiliy can you build the board with pitch 15.75 mil (please note that the actual dimension of the package is 0.4mm), and how many lead on the package. The pad width of Ind

Re: 16 mil pitch QFP solder bridge

Electronics Forum | Mon Oct 09 19:56:41 EDT 2000 | Dave F

CJ: Arturo and the others make good suggestions. Consider: IPC-7525 Stencil Design Guidelines

16 mil pitch QFP solder bridge

Electronics Forum | Sat Oct 07 04:02:50 EDT 2000 | C.J. Long

Good morning, All: I am from PCB shop and one of our customer is experiencing solder bridge on 16 mil pitch QFP( immersion gold finish). Land width requirement is 8 +/- 1 mil measured over top of of land and our mean is 7 mil. Bottom land width is 8

mirco bga stencil opening

Electronics Forum | Thu Sep 12 01:49:28 EDT 2002 | ck

Hi all, Any stencil opening recommendation for 20mils pitch mirco BGA. Currently, using 12mils round opening, 5 mils thickness. Seen to have weak joints as it crack after Ict testing. thks

16 mil pitch QFPs / solder paste type 4 & 5?

Electronics Forum | Mon Apr 07 13:02:30 EDT 2003 | kmorris

Sorry, I forgot to include the stencil thickness. It is 5 mil. Thanks for the input, everbody. I just checked with our stencil supplier & I thought that Electro-polish was standard with lazer, but I now find out it is not. Our stencil did not get

16 mil pitch QFPs / solder paste type 4 & 5?

Electronics Forum | Mon Apr 07 11:39:55 EDT 2003 | russ

How thick is your stencil? We print 16mil every day with type 3 paste 2 of which you have tried (Alpha and Kester) Stencil should be 5 mil. Russ

16 mil pitch QFPs / solder paste type 4 & 5?

Electronics Forum | Mon Apr 07 12:21:02 EDT 2003 | davef

Russ is correct. A 5 thou thick stencil should give good release. Here's how you run through it: * You want at least 5 solder particles across the smallest aperture. So in your case, 8 thou wide, which equals to 0.20mm gives us 0.20/5=40 microns.

16 mil pitch QFPs / solder paste type 4 & 5?

Electronics Forum | Mon Apr 07 09:52:07 EDT 2003 | kmorris

I have just started an assembly which uses a 16 mil pitch QFP. We ran on Saturday, using a type 3 solder paste. (working Sat's really sucks) We really struggled with paste release after the stencil sat for 15 minutes without printing. Apertures clog

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