Electronics Forum | Fri Nov 09 10:49:09 EST 2007 | hussman
Try raising the part off the board a little. I bet this will help.
Electronics Forum | Thu Nov 08 10:05:04 EST 2007 | pjc
I have not seen hold size as an issue when switching Sn/Pb to Pb Free wave soldering. Trying increasing your dwell time in the wave- typical for Sn/Pb is 2 to 3 seconds. Try 5 seconds to see what you get.
Electronics Forum | Thu Nov 08 13:15:30 EST 2007 | russ
60% ratio would be great start. that is what we typically shoot for with all leaded for the most part. 25 mil diameter in a 40 mil hole, works great for auto insertion as well Russ
Electronics Forum | Thu Nov 08 22:27:52 EST 2007 | jkhiew
Did the PTH barrel ends in massive copper clad ? If yes this type of poor thermal layout topside heating is often recommended.
Electronics Forum | Fri Nov 09 15:21:34 EST 2007 | jdumont
Are you thinking for the soon to be displaced air to be able to escape out the top? Raising components wouldn't be ideal from a process standpoint.
Electronics Forum | Sat Nov 10 07:33:51 EST 2007 | davef
Josh: 2222 will meet your requirements. 2221 is a companion to 2222. So, if you're going to try to get your engineers to follow an accepted standard, you might need both. Although, they probably already have both and are just playing dumb with you.
Electronics Forum | Sun Mar 14 19:23:30 EST 1999 | Al
Can sombody help me with this?? When applying solder paste, what factors determine how high off the PCB the stencil is? We use no fine pitch devices. (mostly 603 and 1206 size components) Any help would be greatly appreciated. As you could probably g
Electronics Forum | Thu Nov 08 19:56:08 EST 2007 | davef
Josh: Your 0.009" [0.228 mm] clearance should be fine. The minimum clearance should be ~0.008" [0.20 mm]. Is the 0.039" [0.99 mm] the measured or the expected hole diameter? While we wouldn't like it, we wouldn't be surprised to see 0.008" [0.20 mm
Electronics Forum | Fri Nov 09 00:40:59 EST 2007 | cadcopac
We design and assemble PCB's and use a min of .015 thou over the component lead diameter without incident but if your component pad is in a copper mass either top or bottom this can create other problems especially if you don't have top heating as th
Electronics Forum | Wed Nov 07 13:36:20 EST 2007 | jdumont
Hello all, we are having issues with some specific package type aluminum caps we use while running lead free. We used to run these leaded with none of these issues. Basically we are not getting more than 25% hole fill on these parts. I have tested di
