Electronics Forum | Fri Mar 25 10:50:01 EDT 2011 | grahamcooper22
3 deg / sec) then the flux can slump from the paste and solder is carried with it off the pad and will form balls. Finally, are your pcbs dry ? Pass a bare one through the reflow oven before you print any paste on it, let it cool and then process as
Electronics Forum | Thu May 05 08:14:45 EDT 2011 | kahrpr
Where black pad exists, it is not a common problem. When I read it is totally random I doubt that. You have defiantly something going on that is unique with the process. It is either your board manufacturer or your solder paste or your profile. It c
Electronics Forum | Tue Jul 19 09:14:49 EDT 2011 | kahrpr
All I can tell you about what people do with solder paste at the end of the day or for the weekend is. What the manufacturer recommends. What people say in public? What companies actually do as far as reusing it? I am not passing judgment on 1 or 3
Electronics Forum | Mon May 07 10:42:09 EDT 2012 | saju86ece
Hi, I need one clarification about solder paste printing height tolerance. How to define and fix the solder paste height tolerance after screen printing for inspection purpose. Currently we are using 5mils thickness of stencil, in that we are gave
Electronics Forum | Fri May 11 10:59:39 EDT 2012 | 14367
Thank very much for the feedback. I was asked why mixing the paste was not a good idea. Could you provide the answer please? It's always better to hear from an outside expert:) The SOT23 - some of them have actually flipped upside down ; plus we hav
Electronics Forum | Thu Aug 02 09:56:57 EDT 2012 | mccabekev
We currently operate a procedure of keeping fresh tubes of solder paste in a fridge. When it is required we remove the required quantity from the tube and return the tube to the fridge before it warms up to room temperature. We then store this at r
Electronics Forum | Fri Aug 10 18:06:52 EDT 2012 | mfergus
Anyone have experience printing solder paste for a Toshiba SSM3K15CT(TPL3) FET with CST3 package? Using 1 to 1 rectangular apertures with a 4 mil stencil and Alpha OM 338 #4 powder size lead free solder paste. Print head speed is 15 mm/sec and solven
Electronics Forum | Mon Dec 03 16:05:55 EST 2012 | emeto
Hi all, We are going to evaluate new LEAD-FREE solder paste. We stopped our attention on 3 manufacturers but the variety of products is so big. What would you recommend for a daily basis use? Is SAC305 the most commonly used alloy? We are a subcontr
Electronics Forum | Fri May 31 12:50:42 EDT 2013 | spoiltforchoice
Is this a "thermal balance" issue? In the 2nd image you have a group of pads blobbed together as one giant pad. IMHO this is a bad idea, QFN's rely heavily on the magic of your paste and good PCB design to get good alignment. When your solder paste i
Electronics Forum | Thu May 30 12:27:25 EDT 2013 | ericrr
I was more interested to read up on paste, As for the short run of 50 panels was finished, the panels dribbled out slowly. about three times the second day I took off the paste, mixed it up and put it back on, seems to do the trick. Also I gave ea
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