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 | Sat Mar 06 17:45:29 EST 2010 | isd_jwendell
Unfortunately, what you are calling a good fillet is not a good fillet. Solder on the top of the IC lead does not help to make a good connection. The most important fillet is the one located at the heel (think of the IC lead where it meets the PCB as
Electronics Forum | Thu Mar 22 17:31:08 EST 2001 | davef
Hold off on the sharp knife for little bit. [Yano, I get "queasy" when I see much of my blood, but other people�s blood doesn�t bother me much. Weird, eh?] [Oh bye-da-bye, I didn�t win the bar bet on "Ground Hog Day". I didn�t loose it either. T
Electronics Forum | Wed Mar 22 01:24:54 EST 2006 | Joseph
Dear all, Referring technical report from Vitronics Soltec, "Pad lifting, fillet lifting and fillet tearing issues in LF soldering". The use of LF solder alloys today has brought about a recurrence of this crack formation, called fillet tearing. The
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 | Fri Jan 26 16:24:10 EST 2007 | Bob R.
Whether there's a fillet or not depends on the component type. Most have a fillet but some, such as QFN's, don't necessarily have one. Have a look at IPC-610D Workmanship Standards to understand when you should expect one and when you shouldn't. T
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 | Thu Dec 12 12:54:25 EST 2013 | jaimebc
For selective soldered components, or even hand soldered, with vertical bend components, the body of the component, in this case a resistor, is making contact with the surface of the PCB, making it impossibe to visually see the solder fillet. Or to d
Electronics Forum | Fri Jul 19 13:02:01 EDT 2019 | davef
Double-check me on this, but I don't believe that A-610 [IPC-A-610] requires side fillets on QFN solder connections, because the sides of most terminations are not plated. Plating on the bottom of the termination is sufficient for a proper solder con
Electronics Forum | Wed Dec 18 16:21:54 EST 2019 | jrow
Hello! We are having field failures due to cracking of the solder on our SMD micro switch components. I have been reading the IPC standards, and the only thing that it states regarding the solder profile/amount for Gull Wing component is "wetted fill
