Electronics Forum | Thu Dec 21 21:09:58 EST 2006 | MFG CAVEMAN
Ditto what Russ said. We are doing the same with the same results. We also will add 10-15mils to the toe end of the pads to have some chance at forming a toe fillet. MFG'r recommended padstacks are not to be trusted. We only process with no-clean
Electronics Forum | Fri Dec 22 11:32:56 EST 2006 | realchunks
We generaly reduce 25% and get great heat sink capability. Mind you that we do not perferate the pad with vias as recommended. Our toe ends are not plated, so getting any toe fillet is impossible.
Electronics Forum | Tue Oct 05 12:29:28 EDT 2010 | mikesewell
It is possible to infer that the lead is lifted based on the toe fillet appearance, but it's not as reliable as say a laser or xray inspection. This is usually done by varying the light source location and or color and looking at the images resultin
Electronics Forum | Mon Dec 01 13:17:43 EST 2008 | realchunks
Jandon, what is wrong with the picture you posted? Looks good to me? The first pix Wewilldoit posted were kinda scetchy except for the one with the bent up lead. It's not the toe fillets people - it's the heel fillets you have to look at.
Electronics Forum | Wed Jul 06 12:25:55 EDT 2005 | HOSS
Bob, We have seen this same issue and haven't found a solution other than touching up to create a toe fillet. Luckily, it's a low volume product, for now. What have you done to combat this? Thanks.
Electronics Forum | Tue Feb 20 09:46:17 EST 2007 | kmeline
Thanks for the info. I will inform the QA department about the lack of a toe fillet. I am sure it will be an issue.
Electronics Forum | Mon Mar 19 11:20:10 EDT 2007 | realchunks
When you say "No wetting" you mean the paste looks the same as it did going in but dried out? Or is it that you are not getting toe fillets?
Electronics Forum | Tue Mar 20 17:53:44 EDT 2007 | diesel_1t
is not getting toe fillet, you can se like a "paste dome" on the pad so the paste is not flowing to the pin...
Electronics Forum | Mon Jan 29 17:25:10 EST 2007 | darby
I'm confused, How can your customer possibly EXPECT a fillet if the pad is smaller than the part? I thought everyone was over the whole toe fillet thing many years ago. Wasn't there some papers from NASA nearly ten years ago that advocated the "less
Electronics Forum | Wed Aug 15 05:19:14 EDT 2001 | hardy boy
Hi, I have a fine pitch QFP (TQFP100) and after reflow soldering, i got less solder ( not enough fillet) on the toe area but have good fillet at the heel. Does this mean that I have a weak solder joint or is my process not too good ? What is importa
