Electronics Forum | Tue Jun 13 13:42:34 EDT 2006 | Bob R.
Also be careful in assuming you have black pad. A nice straight crack along the Sn-Ni intermetallic is probably just overstress at some process (most likely ICT). The better board suppliers figured out how to avoid black pad years ago.
Electronics Forum | Mon Jun 19 21:40:52 EDT 2006 | davef
While underfilling BGA "mounted" on blacked pad boards could improve the reliability by attaching the BGA to the board, you should believe that all components soldered to the board will be affected by the black pad, not only BGA.
Electronics Forum | Tue Dec 05 07:00:05 EST 2006 | Jack
It is very common to relate ENIG pad surface finishing with BLACK PAD defect. However, is anyone know why BLACK PAD defect only happen on fine pitch pad areas suach as BGA, QFP? Why this defect did not or seldom happen on capacitor @ resistor pad??
Electronics Forum | Mon Oct 20 13:34:10 EDT 2008 | patrickbruneel
Picture (img133) sure looks like black pad. Maybe you can compare the pic's yourself with the pictures in the ITRI Report on black pad. http://www.pwbrc.org/members/pdf/works99/Houghton.PDF
Electronics Forum | Mon Oct 20 17:06:43 EDT 2008 | davef
Patrick You're correct that black pad analysis is a distructive test. Kicking the lead-free dog certainly is easy [and somewhat fun] to do, but black pad is an equal opportunity defect. It affects leaded boards as well as it does with lead-free.
Electronics Forum | Wed Aug 17 21:29:25 EDT 2011 | davef
If looks were the measure, we'd say, "Hail yes, it looks like black pad." The determination of black pad or not is best done in a laboratory.
Electronics Forum | Fri Aug 19 11:13:40 EDT 2011 | eezday
I'm still sold on the "black pad" model. The price of gold should be a good indicator of what is happening. The gold plating solution is being used well past its life and plating times are stretching. Extended time in the plating solutions is a lo
Electronics Forum | Fri May 23 23:58:48 EDT 2014 | edriansyah
Hi Hege. I was not also too confident with the black pad (coz no black residue on the remaining pad). But based on my search on the internet regarding black pad. Most of them shows a very clean BGA Pad after peel off the BGA as the picture reference
Electronics Forum | Tue Jan 10 08:50:07 EST 2006 | Amol Kane
I read a paper somewhere that outlines a non destructive test for black pad detection. it showuld be on my hard drive. Black pad is as a result of impurities in the plating bath and poor process control. I shall dig up the paper and mail it to you if
Electronics Forum | Tue Jan 10 17:10:35 EST 2006 | mdemos1
JAX: Thanks for the reply. We did send one of the boards back to the bare board supplier and they do concede that it is black pad. When you inspect the assembled board under a microscope, you can easily move the entire solder joint away from the p
