Electronics Forum | Tue Mar 30 17:52:15 EDT 2010 | cusackmusic
They are very finiky. If you have good solder paste, and a slight down pressure, to make sure the LED is "stuck" to the board, you should be able to place it. Pick it up on the center of the flat, NOT the lens. Even with the vacuum turned off, t
Electronics Forum | Wed Apr 16 01:40:17 EDT 2003 | praveen
Hi , We are using water wash solder paste to solder the SMT LED's manufactured by Chicago Miniature lamp (CMD93-21 & 22)and Kingbright. Achieving the solder fillet , wetting has no issue but we observe high fallout at the functional testing. If we do
Electronics Forum | Mon May 05 11:35:00 EDT 2003 | Grant
Hi, This is an interesting point. I use Koki paste from Japan, and it's wonderful, however what properties of solder paste would make it "anti tombstone" paste? How does led free effect tomb-stoning? That would be interesting to know. We might go
Electronics Forum | Tue Aug 23 08:43:35 EDT 2005 | SuMoTe
Hello all, I am using a led base past on a very thick board. Profiles are 260c in final zone. Currently I am using Biral "NoMelt" grease. This is not good enough for my process. After 1-2 shifts all of the grease is gone. What are you all using?
Electronics Forum | Tue Feb 24 12:45:30 EST 2004 | esoderberg
Contact Kittner equipment supply Ph#607.757.9711 and talk to Walt or Dick. They have modified a unimod in the past to insert the four legged leds.
Electronics Forum | Sun Jun 13 07:57:15 EDT 2004 | Grant
Hi, We have been offered some lead free BGA parts in place of normal lead solder BGA parts in our process, and because we can get them faster it would be a good option. However does anyone know if we can use them as normal. I assume the balls won't
Electronics Forum | Thu Dec 26 12:41:53 EST 2019 | emeto
We agree with your statements. 1. Having manually printed board will compromise your print and you don't know how much paste you have on each pad. 2. LEDs falling off that easily might be related to contamination, considering that your profile is not
Electronics Forum | Thu Apr 17 10:25:42 EDT 2003 | davef
You'd think 219*C should be warm enough, but we'd go higher just to get the part to stick. What is: * LED terminations material? * Alloy and flux type of your solder paste? Is you solder sticking to the pad and not to the component? Or what?
Electronics Forum | Mon Apr 25 14:44:26 EDT 2022 | dwl
You could try putting a dot of adhesive like Loc tight chip bonder or similar between the pads. The adhesive will cure before the solder paste hits the reflow temp and hold the LED in place.
Electronics Forum | Thu Jan 30 11:21:18 EST 2014 | emeto
Hi, we do that for some of our assemblies(the only difference is that our cut in the PCB is bigger and the LED leads step on the paste right away). we place these manually. I assume that you can send them for tape and reel, and if they can find the r
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