Electronics Forum | Thu Jul 05 08:11:45 EDT 2007 | naynayno
This is wave soldering process and design question since most folks associated with SMT are processing mixed assemblies. We have a 3-leaded sensor (radial) with such a tight pitch always bridges. Solutions unders disussion are pre-forming and addin
Electronics Forum | Thu Jul 05 19:37:15 EDT 2007 | davef
We assume the three leads are lined-up perpendicular to the wave. Without taking corrective action, we know this: * 50 thou pitch will bridge * DIP do not bridge As a corrective action that doesn't invovle a respin of the board, decrease the solderm
Electronics Forum | Fri Jul 06 15:45:50 EDT 2007 | hussman
I have to agree with the fat green guy. And with Real Chunks too. You should also run a matte mask on your board. This will help in preventing shorts.
Electronics Forum | Thu Jul 05 10:41:37 EDT 2007 | realchunks
Hi BR, Are you screen printing adhesive to the bottom of the board? If so, have your stencil make put openings between the leads of the thru-hole part. SMT adhesive acts as a natural solder resist. So placing a small sliver between the pads works
Electronics Forum | Fri Jul 06 11:00:50 EDT 2007 | shrek
Krikies my friend. A good wave ogre will be able to look at a wave and tweak in a way to minimize contact length (by slowing the conveyor speed), thus improving peelback, and lower it to the bare minimum without disrupting it's backward and forward
Electronics Forum | Sat Jun 25 00:52:31 EDT 2005 | ktron
Hi all, Recently I had problem with printing the lead free solder paste, almost every board has bridging especially on the fine pitch locations. Anyway this problem never happens when we use leaded solder paste. So I would like to ask if there are a
Electronics Forum | Thu Dec 09 04:53:36 EST 1999 | Glen brain
Hi, It is wavesoldering defect, in single- sided copper board, using alcohol-based rosin flux. It is not a bridging between the protruding leads but a metallic (I think, it is solder) link, varies in dia./thickness, connected the basement of solde
Electronics Forum | Thu Aug 12 18:43:49 EDT 1999 | Wayne S.
Hello Having a problem with bridging on 20mil pitch qfp, only on the lead groups where squeegee goes over width of apertures. Using MPM sp-200 semi-auto, chem-etch stencil, 9-10mil width opening 100 durometer blade. Getting "tails" on deposits. Trie
Electronics Forum | Wed Nov 07 11:56:44 EST 2001 | mparker
Pad spacing is just one element to consider. Your pad spacing is determined by the pitch (center to center distance between the leads). There are several good resources to find the appropriate pitch per device. Search the archives here or refer to th
Electronics Forum | Wed Jun 25 11:24:20 EDT 2008 | namruht
I do not have a lot of specs at the moment. I just wanted to get some opinions and some of you thinking. I will get some part specs and add to this post later. WE are running a pretty big PCB and ther are some connectors on the edge of the board. T
