Electronics Forum | Sun Jul 31 10:06:51 EDT 2011 | davef
Try the NASA Workmanship Standards Inspectors Pictorial Reference document: http://workmanship.nasa.gov/lib/insp/2%20books/frameset.html Look at Section 7.08 SURFACE MOUNT TECHNOLOGY (SMT) BUTT "I" LEADED PACKAGES
Electronics Forum | Wed Feb 06 17:24:04 EST 2008 | blnorman
We had a vent block up not too long ago ourselves. Saw multiple solderjoints, especially on fine pitch micros, that looked like they had alligator toes. We solder bump, so it was obvious that area didn't get hot enough to liquify the solder and hav
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 | Tue Apr 10 20:54:09 EDT 2007 | raychamp007
Dear Friend, Can any one explain what is 'toe down configuration' stated in 8.2.5.6 IPC-A-610D? Can any one here to explain in more details. Thanks
Electronics Forum | Thu Apr 12 08:16:19 EDT 2007 | davef
Toe down solution: * Land pattern design * Solder stencil design * Proper component fabrication Normal gull wing lead solder requirement: Solder must extend to the mid-point of the outside of the lead bend.
Electronics Forum | Thu Apr 12 00:25:25 EDT 2007 | raychamp007
Thanks davef! We found some SOIC & QFP with all leads having toe down problem. The heel fillet unable extend to the mid point outside bend. Do you have solutions for the problem? I have a question: How about the normal gull wing lead which is flat &
Electronics Forum | Thu Apr 12 01:35:13 EDT 2007 | Haris
IPC-A-610D is a Acceptability of the Electronic assemblies so all your questions depends on the product classes either 1,2,or 3 and it is given in this standard about the acceptablity criteria of the soldering of any type of the components i.e. it h
Electronics Forum | Mon Jun 30 10:02:37 EDT 2003 | Steve Gregory
Hi Russ! An "R" QFP is what Altera calls their Plastic Quad Flatpacks that have a heatsink in the top...they actually call them Power Quad Flatpacks. I'm familiar with the formula, of how one can figure out if there's enough surface tension for a p
Electronics Forum | Fri Sep 02 10:27:49 EDT 2005 | Rob
One of our customers picked up an assembly, dropped it on a concrete floor, then kicked it down the corridor. Broke his toe on the steel enclosure, & suffice to say never tried it again. Nothing like decent, documented & controlled scientific testi
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
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