Electronics Forum | Fri Jun 10 09:02:58 EDT 2005 | ktron
Hi Guys.. Does anybody had experienced with designing the stencil for Right Angle LED without any dewetting problem on the LED termination? Currently our stencil opening is 1:1 and we still got so high reject due to this problem. Pls Advise, thanks
Electronics Forum | Fri Jun 10 19:42:46 EDT 2005 | ktron
Thank D.B. Cooper, actually this LED has 3 sides termination but no termination at underneath of LED. So this LED tends to float rather than performing solder joint during reflow process.
Electronics Forum | Fri Jun 10 13:15:17 EDT 2005 | chunks
Hard to tell, but it looks as if this LED has no side termination, so it may only look like dewetting. If everything around this part is reflowing, I'd bet that's all this is.
Electronics Forum | Thu Jan 14 15:22:14 EST 1999 | Earl Moon
| Steve, | Whoa, take a breath! That was at least a dollar three-eighty answer. I've got to agree that nothing can replace a qualified, concientious operator for assuring quality. When I too worked at a small shop there in SillyCone Valley, my
Electronics Forum | Fri Sep 15 10:00:15 EDT 2006 | Joe C.
Hello Everyone, Does anyone have any experience with an SMT right angle LED from Panasonic, part number LNJ123W8PRZ. In our experience the pattern design from the vendor was not very effective (the part swam around on the pads & flipped backwards dur
Electronics Forum | Tue Sep 24 11:10:07 EDT 2002 | Gregg Temkin
I�d appreciate assistance in trying to resolve a placement/soldering problem. My company has designed a board which uses a large number of 0402 LED�s that are .028� high. The LED�s need to be soldered so that they point straight up and are not til
Electronics Forum | Tue Sep 24 12:49:43 EDT 2002 | dragonslayr
Aperture reduction @ 5 mils thickness is your best bet. It may take several attempts to get just the right paste volume. What aperture reduction was specified to the stencil house for these specific LEDS? or was the stencil blindly produced using a
Electronics Forum | Tue Aug 14 16:26:21 EDT 2007 | slthomas
So it's a C-n-C clearance issue? Could you go with the other cutnclinch unit...which ever you have, get the other one (one's right angled, one's offset at 45�)? Yeah, I know, they're not cheap. Other than that, hand place some of the SMT in chip bon
Electronics Forum | Thu Dec 07 19:20:28 EST 2006 | ganoi
Most likely there is movement during reflow. How about conduction oven over convection oven for reflow? This is a small PCB with the LED sitting on a Flex-Rigid extension from the PCB. I was thinking if the stencil aperature for the LED was to be cu
Electronics Forum | Fri Dec 08 11:30:19 EST 2006 | ganoi
We discussed about applying 2 dots of glue on either sides of the LED body, but have yet to try it out. Other discussions include conductive adhesive, using fixturing with weight, different stencil aperature design, hand soldering.
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