Electronics Forum: aperture shape (Page 4 of 16)

Re: Solder Beading Solder Balling

Electronics Forum | Thu Aug 05 11:15:39 EDT 1999 | John Thorup

| | | | | | | | | Hello, | | If you are using no-clean and they are entrapped in the flux it is also IPC accepted but i havent found a customer yet who agrees with that. Im sure you have checked your profile. I had the same problem with chip compon

Printing problem, water soluble paste with gold plating PCB..

Electronics Forum | Wed Aug 01 06:52:25 EDT 2001 | Mark

please look at trying lazer cut stencils. They have trapozoidal shaped apertures and this could assist with the paste releasing onto y the PCB

BGA Assembly

Electronics Forum | Wed May 29 10:11:50 EDT 2002 | wilcoxito

Thanks for your input, Alex. I appreciate it. I'd still like some input on diamond-shaped apertures if anyone has had experience with them.

BGA Assembly

Electronics Forum | Wed May 29 10:52:56 EDT 2002 | slthomas

Just wondering why you'd use a diamond shaped aperture? Seems like it'll just fill in the corners and be pretty much round anyway, so why not just start out that way and keep the volume you want?

Reliability of U-shape appetures

Electronics Forum | Tue Jul 09 08:29:10 EDT 2002 | r_sturdevant

I agree with others here who have questioned the amount of solder and reliability of the joint when using this aperture shape. I have had experience with these with MELFS, and the main issue I've seen comes when cleaning the stencil - all those littl

Tombstoning 0306's

Electronics Forum | Fri Sep 09 11:37:27 EDT 2005 | ???

Try home-plated the stencil apertures, and make "V" shape home-plated outside edges of two pads instead of between two pads.

Re: Solder Beading Solder Balling

Electronics Forum | Thu Aug 05 11:51:44 EDT 1999 | Wolfgang Busko

| | | | | | | | | | | | Hello, | | | If you are using no-clean and they are entrapped in the flux it is also IPC accepted but i havent found a customer yet who agrees with that. Im sure you have checked your profile. I had the same problem with chi

Tombstoning 0306's

Electronics Forum | Fri Sep 09 14:03:06 EDT 2005 | Mei

Nomorely the V-shape home-plated apertures look like two opening mouth facing each other. But this time just opposite way. And make 30% home-plated. Hope you can understand.

type 3 vs type 4 paste

Electronics Forum | Thu Nov 07 10:59:11 EST 2002 | pjc

IPC-7525 "Stencil Design Guidelines" is a good reference document to have. Here are notes from a Tessera, (a major mBGA mfg.), study- "Application Note Solder Stencil Requirement for mBGA" The stencil aperture is to be square, equal in size to the l

uBGA PCB design and stencil design

Electronics Forum | Mon Oct 21 23:48:13 EDT 2002 | harris

Hi: If anyone have the experience with the PCB pad design and stencil design for the uBGA? We meet the problem for it. The component data is 0.3mm diameter and 0.5 pitch. Could anyone tell me the PCB pad dimension, the stencil type and aperture dimes


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