Electronics Forum: solder bridge fine pitch (Page 1 of 87)

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

fine pitch QFP

Electronics Forum | Thu Jun 16 22:14:51 EDT 2005 | davef

16 thou pitch parts: Use a 5 thou laser cut electropolished stencil with 0.008"x0.045" apertures and type 3 solder paste. Bridges Connecting or Partially Connecting Adjacent Leads or Lands * Excessive solder paste * Excessive component placement pre

fine pitch QFP

Electronics Forum | Thu Jun 16 00:24:29 EDT 2005 | mskler

Hi everybody, Can some body tell me that what stencil thicknes is required for the 16mil QFP. I am getting bridging as well as dry at QFP pins. What type of solder 1. Viscocity 2. mesh size 3. flux contents Should be used for this type

fine pitch on thick copper

Electronics Forum | Mon Dec 20 07:58:02 EST 1999 | pascal MATHIEU

hello guys ; we are using a fine pitch component(0.65mm) on a thick copper PCB (Cu = 90�m) ; in this case we notice that we are in the process'limits , because the different supplier of the PCB are not able to ensure a good stability of it's process

Trouble selective soldering fine pitch connectors

Electronics Forum | Thu Dec 06 12:37:14 EST 2012 | deanm

We are having difficulty with bridging on a 2x50 pin 0.050" fine pitch connector using our selective soldering machine. It usually bridges at the end of the row, but sometimes it bridges all the pins together as it drags across (solid bridging). I

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 | Sat Oct 07 11:14:39 EDT 2000 | Aaron

1. It is hard to tell, but your PCB vendor should test the PCB. 2. I think the important thing is the width of the apertures. You should have it laser-cut, and control the width no more than 90% of half pitch. Good luck.

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

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 | 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)

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