Full Site - : aperture plated (Page 13 of 17)

Voiding in CSP Ground pad

Electronics Forum | Mon Feb 03 22:48:00 EST 2003 | vinesh

Hi all, We are using small CSPs (10x10mm) in one of our products which has a big ground pad in the center (7x7mm). The maximum voiding allowed on this big pad is also no greater than 25% which we are finding very hard to achieve. The centre pad ha

Soldering issues lately!!

Electronics Forum | Thu Sep 11 20:32:08 EDT 2008 | diesel_1t

I know that most of the problems are called solder issues, this is why i put "solder related" quoted because i have seen more than usual "solderability issues" posted on this forum lately. I had a tombstoning issues with 0603 resistors, on some mat

Solder mask and fine pitch devices

Electronics Forum | Tue Jan 08 09:23:18 EST 2013 | lock_2002

This is a question regarding soldermask between pins of fine pitch devices. The majority of our production designs end up with at least 2-3 mils of copper thickness on the external layers due to blind vias, wrap plating requirements, etc. Our curre

Re: Solder Wetting

Electronics Forum | Tue Dec 14 17:02:04 EST 1999 | John Thorup

Hello Kris If you do have and OSP coating I'd say Curtis has nailed it. But you seem to have references to gold. Does this board have a standard nickle/gold finish. If so what sort of "solder on gold" problems were you having? Reading between the

Re: problem in micro-BGA assembly

Electronics Forum | Thu Jul 01 13:57:57 EDT 1999 | Kris Wiederhold

| Dear guys, | | I have some problem on assembling micro-BGA with solder paste (63/37). The micro-BGA we assmeble is 0.75mm pitch and with 45 pin (solder bump is 96.5/3.5Ag). The stencil is a laser-cut stencil with 5 mil thickness. We are now usin

Re: Solder Beading Solder Balling

Electronics Forum | Fri Aug 06 06:13:37 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

Paste in hole (sate of the art)

Electronics Forum | Tue Feb 21 11:59:56 EST 2006 | dannyleach

We design a broad range of DC/DC power supplies for various telecom, internet, and computor applications and have been succesfully using intrusive reflow for ~7 years now. Our pcbs range from 0.065 to 0.090 in thickness and are moslty dense 4 to 8 la

Solder Ball Attach (BGA)

Electronics Forum | Mon Sep 24 12:58:31 EDT 2018 | vincentl

We are attaching 0.50mm diameter SAC 305 solder balls onto 0.38 diameter Au plated pins placed at a 0.80mm pitch (pins are pressed into a plastic insulator). A tacky flux is then stenciled onto the pins using a stencil with.a 0.38mm diameter aperture

Solder flow thru via on pad

Electronics Forum | Tue Sep 25 14:08:59 EDT 2001 | davef

Oooo, the solder on the pad and PGA ball is flowing during reflow down the via to the secondary side? Why didn�t you say so?? ;-) Why would you expect that gravity and capillary action wouldn�t force solder to flow down the solder plated via to the

PIHR Inspection Criteria

Electronics Forum | Thu May 17 07:36:40 EDT 2001 | Bob Willis

Here is a copy of a draft document on PIHR Inspection I have jotted down on a flight to Scotland yesterday, any comments suggestions etc ? I have already most of the photos for the standard but as you know there is nothing in the IPC document it just


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