Electronics Forum: qfn and solder and void (Page 2 of 4)

No Clean and Underfill

Electronics Forum | Wed Mar 04 14:35:16 EST 2009 | clampron

Good Afternoon Everyone, I have a customer who is inquiring as to the use of a no clean solder paste on their RoHS assembly. We are currently building this with OA, cleaning and then underfilling the QFN, BGA comonents after a sucessful ICT. Does any

QFN's and LGA's

Electronics Forum | Tue May 26 14:39:40 EDT 2009 | boloxis

QFN or MLFs are mainstream now, QFNs already evloved to much more complex versions now like matrix pins, stacked dice and flipchip versions. IPC 610D already includes them, just make sure the pins have solder plating, the PWB pads have soldermask in

Lead-free and Leaded solder in the same reflow

Electronics Forum | Fri Feb 03 16:40:24 EST 2006 | Mike

At my last employer, we ran a number of tests to make a "Hybrid" profile work (same profile Joe lists) . It worked great for everything but BGAs. The problem (6 months ago) was using parts not rated for lead free reflow temps. As the market fills wit

Lead-free and Leaded solder in the same reflow

Electronics Forum | Wed Feb 01 06:02:59 EST 2006 | joe

Hi, SAC BGA's in a SnPb reflow process can be achieved by ensuring the temp. on the BGA is at a peak min of 220�C and a time above 207-210�C for 60 - 90 Sec. Lower temperatures have shown incomplete mixing of alloys and some voiding.

"Gap" in completed solder joint between lead and pad

Electronics Forum | Tue Nov 28 15:10:50 EST 2006 | M. Sanders

Unfortunately, I don't have a copy of IPC-A-610 D on hand, however, I believe in IPC-610, this �floating height� between lead and pad has no maximum specification restriction. As long as there is no voiding, it is still acceptable for all 3 classes.

Pb free BGA and Sn Pb solder paste

Electronics Forum | Wed Jun 02 05:40:35 EDT 2004 | johnwnz

Is there not an issue with reflowign the SAC ball's in term's of drivign up the lead contect in a lead free joint that increases the risk of failure in them? certainly dramatically increases voiding... have some pictures of soem that a customer tried

BGA rework and inspection

Electronics Forum | Thu May 30 10:31:03 EDT 2002 | robbied

Hi Yannick. This is an issue that we are just recently getting into but here is some ifo that I have gathered so far. I have seen/ used 2 different rework machines. The one we have bought is a 'PACE TF2000' which was at the lower cost end of the mar

voids- leaded and chip components

Electronics Forum | Fri Jan 23 10:39:35 EST 2004 | patrickbruneel

Kris, I assume with voids you mean acceptable solder coverage of pad and lead. As Dave mentioned I also have not seen any specific studies on voids, but workman ship standards exist about acceptable coverage of pad and lead (both consumer and MIL)

BGA ball and PCB pad

Electronics Forum | Fri Feb 13 11:46:23 EST 2004 | Jack

Is your customer trying to reduce voiding? If the device is using Sn90 / Pb10 and the paste is Sn63/Pb37 the board will melt first. However, if both solders are 183C eutectic, it's a tossup? PCB design, copper weight, bga type (pbga, micro bga, Tbg

BGA ball and PCB pad

Electronics Forum | Fri Feb 20 13:01:26 EST 2004 | Jay

First, it depends on the alloy composition of the solder. As you might know, eutectic Sn/Pb solder has the lowest melting point among available conventional solder systems. (except those based on Sn-In and Sn-Bi systems.) For example, 63Sn/37Pb - 183


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