Electronics Forum | Tue Sep 23 10:06:29 EDT 2008 | Sean
Hello Vlad, Davef, Your valuable inputs are much appreciated. Many thanks, Sean.
Electronics Forum | Fri Jan 18 12:42:42 EST 2019 | ameenullakhan
Hi, Thanks for the valuable feedback. Thanks ALL. Regards, Ameen
Electronics Forum | Sat Jan 19 12:39:16 EST 2019 | bane016
Have you tried to reduce the temperature for the second side of pcb?Try to reduce it to the minimum below the regulations by datasheet...
Electronics Forum | Sat Sep 20 07:11:28 EDT 2008 | Sean
Hello All, I used to hear that PCB with immersion silver finishing, its non component location pads, tend to be discolour (Yellowish) after went through heat cycle, such as reflow oven. However, if the component solderbility on the PCB is OK, can w
Electronics Forum | Thu Apr 22 10:57:20 EDT 1999 | Jack Coia
On various PCB's after building processes,such as reflow, flowsolder and wash. The soldermask on the PCB's have become discoloured, like a 'marble' effect all along the solder side of the board, it is lighter in contrast than normal, although when ot
Electronics Forum | Mon Oct 24 17:56:57 EDT 2005 | Ali
Hello all: A couple of queries on matte Sn plating: My Application: 2 Reflows in subassembly reflow+ 8 Hr Steam age+ Solderability (Dip and look) for sub assembly to mother board soldering. Queries on Matte Sn: 1- Different plating vendor
Electronics Forum | Sun Sep 21 10:55:52 EDT 2008 | vladig
As long as the surface is solderable, you should be fine. Silver tarnish a well0-known thing. Make sure, though, there is no sulfur (S) "around". Regards, Vlad
Electronics Forum | Fri Jan 04 07:44:37 EST 2019 | bane016
Try to measure the profile again by datasheet..with the result that you will reduce the temperature in the areas below...increase the upper temperatures as needed according to the properly measured profile...I hope you can solve the problem like this
Electronics Forum | Fri Jan 04 08:02:03 EST 2019 | ameenullakhan
Hi, Thanks for the valuable feedback. We are at lower spec : ( TAL )Reflow time : Around 50 Sec ( Above 217 deg C) Peak Temp : 240- 245 deg C. Any other suspects. And your English is fine :) Regards, Ameen
Electronics Forum | Fri Jan 18 12:05:47 EST 2019 | SMTA-Timothy
It's unlikely to be a reliability issue. It looks like tin oxide. Nothing to be too concerned about. Otherwise your process controls sound robust.
