Electronics Forum | Thu Jul 05 15:13:46 EDT 2007 | joeherz
We've seen non-functional QFNs cured by touching up the toe fillets. Especially with parts that are not plated on the edge/face where you get minimal/no wetting due to oxidation of bare copper. I'm not suggesting that you touch everything up but th
Electronics Forum | Wed Mar 31 20:34:03 EST 2004 | davef
We have not used this specific package. We agree on your toe fillet idea. Toe fillets add no strength to solder connections. This part is a MicroLeadFrame�, which is similar to QFN, BCC, LGA, and whatnot. Consider: * Searching the fine SMTnet Arch
Electronics Forum | Thu Jan 08 14:33:50 EST 2004 | dwzeek
Toe fillets are not required per IPC. Toe fillets could be used as a process indicator, if you desire; I would not. Gull wing leads are typically cut off on the ends when manufactured; this exposes the non-plated material in the lead, typically coppe
Electronics Forum | Mon Jan 12 08:56:09 EST 2004 | Paul F
Is anyone having issues with fillet inspection on AOI machines due to poor toe fillets caused by exposed base metal? We're just getting into AOI now and QFP inspection is proving difficult.
Electronics Forum | Tue Jun 28 12:12:17 EDT 2005 | Paul
I'm with DaveF on this one. I think you'll be trying solve this one for a long time. Alloy42 just doesn't like to be soldered. What exactly is the issue? Lack of a toe fillets at on the cropped lead? There is no spec for a toe fillet other than to
Electronics Forum | Wed Apr 11 08:36:23 EDT 2007 | davef
IPC-A-610D refers to 'toe down configuration' several times, beyond the 8.2.5.6 that you question. Although none will add to your understanding of 'toe down'. A lead that is 'toe down' is one where the foot of the lead is not parallel to the pad. T
Electronics Forum | Thu Jan 08 16:24:15 EST 2004 | Dean
I agree 100% The strength of the joint is contained at the interface. Ever seen a fillet on a mail stamp?
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
Electronics Forum | Mon May 17 22:46:02 EDT 2010 | qaace
IPC also states that side overhang on a gull wing of 50% is acceptable for Class 2. Does anyone know if that interprets to only one side having a fillet? Also with toe overhang acceptable, there need not be a toe fillet.
Electronics Forum | Wed Aug 15 08:05:44 EDT 2001 | wbu
Oh boy, I prefer the fillet at heel of course, the toe you can�t trust. The solderable finish of the leads is applied and than the leads are cut leaving the toes without this so much loved finish. guess how that looks after you�ve finished your job.
