Electronics Forum | Wed Jan 09 15:24:49 EST 2002 | mregalia
Thanks Chris. As I was writing my last message our mailperson dropped off the latest issue of Circuit Assembly. It has an article on mixing SMT and COB on the same board. The author recommends as a compromise 10-20 micro inches of gold over 70-100 of
Electronics Forum | Wed Jul 31 13:19:38 EDT 2013 | anvil1021
Does anyone know how to test for hard gold on a PCB? We are in a challenging situation with a PCB provider and we need some objective evidence other than wire bond failure to present to them. Any comments could help ....Thank you Anvil
Electronics Forum | Fri Oct 06 04:23:06 EDT 2006 | David
What is the solder finish of the board?. If this is gold, maybe you should check the reflow profile and max temperature which can easely kill your gold coating so problems with bonding. Also we are using Prozone Multicore with ultrasonic to clean
Electronics Forum | Tue Nov 15 09:31:27 EST 2005 | arclightzero
I have been reading a good deal about IMC (purple plague in particular) in gold wire/aluminum pad wire bonds. My company uses ultrasonic wedge bonding, and for the most part all of our bonding is gold/gold, however we have one particulr part that has
Electronics Forum | Mon Aug 02 11:44:49 EDT 2004 | jbabson1
If you do wire bond before printing, Photo Stencil (www.photostencil.com)can help you design a stencil with relief on the pwb side for the wirebonding.
Electronics Forum | Wed Jun 25 06:43:06 EDT 2003 | cyber_wolf
We are currently producing a board for a customer that has about 400 gold fingers that get wire bonded after the assy. leaves our facility. We have tried many different approaches to ensure that we are not getting solder on the gold fingers. Nothing
Electronics Forum | Wed Jul 02 03:24:35 EDT 2003 | ramanandkini
did you check with lackwere peters? My frined told me that they have some coatings for this application.
Electronics Forum | Wed Jul 02 19:20:43 EDT 2003 | teamcanada
Have you looked into Kapton tape as a protectant?
Electronics Forum | Sun Apr 05 00:23:53 EDT 2020 | researchmfg
1. To protect the nickel and copper under gold plating from oxidization before soldering. Gold plating can extend the PCB self-life and improve the solderability for 2nd re-flow. 2. Provide a good bonding strength. For Chip on Board process that Gol
Electronics Forum | Thu Jul 03 11:36:57 EDT 2003 | Ron
Have you considered a temporary water washable solder mask. Elvaway solder mask tapes have been protecting Gold Fingers during soldering and simply wash away in a water wash process and leaves no residue.
