Electronics Forum | Thu Nov 06 09:10:13 EST 2003 | successmani
hi, NEMI recommends separate solders for reflow sodlering and wave soldering. Reflow soldering- Sn-3.9Ag-0.7Cu Wave sodlering- Sn-0.7CU Wavesoldering- Sn-0.7Ag What will happen if a mixed technolgy PCb board containing both through hole and surface
Electronics Forum | Thu May 12 10:09:11 EDT 2005 | LUPO
HI, What are advantages and disadvantages of selective sodlering process? Does anyone have any experience with selective soldering machines SEHO? Is it possible soldering of through-hole pins on PCB close to high frequency of the SMT componen
Electronics Forum | Wed Feb 04 08:49:52 EST 2009 | milroy
Hi First of all you have to respect the dwell time and the time after the reflow at peak tmeperature.(225�C for Pb and 235�C for Pbf) You can find the reflow profile from manufacturer for majority of parts designed for reflow sodlering. In general t
Electronics Forum | Fri Feb 15 15:37:35 EST 2019 | emeto
Hello, I have a capacitor that doesn't form intermetallic joint with SAC 305 solder paste.The board is ENIG. Solder melts and forms good intermetallic joint with the PCB finish. However, capacitor can be removed with physical force - it looks like a
Electronics Forum | Fri Jul 04 21:09:04 EDT 2003 | ramanandkini
I have a CEM-1 PCB board with 35 microns copper. This is PCB is finished with SMOBC+HALS. We do solder SMT LEDs, but till date we do not have problems that you have listed. The LEDs are good & bright. It even passed high & low temp cycle tests (-40 t
Electronics Forum | Fri Oct 22 19:34:56 EDT 2010 | hegemon
Thanks for the help guys. Nice to think I was basically on the right path. PCB manufacturer has finally conceded the barrel defects and is remaking the PCBs. We are big on pre-tinning the leads of TH connectors as well as providing some good pre
Electronics Forum | Thu Aug 08 10:58:18 EDT 2002 | Tom Gervascio
I'm interested in sharing any information on bumping of LAnd Grid Array (i.e. QFN) packages. due to PCB contraints, it's not possible to stencil paste onto sites for QFNs. That lead to a lot of experimentation with bumping of 6 mm QFN packages.In sum
Electronics Forum | Tue Jun 15 04:55:00 EDT 1999 | Brian Ellis
The other answers on this thread are realistic but it also depends: a) on the quality and finish of the components and PCB (including, of course, solderability) b) the flux type (I would expect lower defect rates with water-soluble than with the less
Electronics Forum | Mon Jan 15 09:19:29 EST 2007 | tk380514
We use Alpha EF-2202 low-VOC No-Clean flux Selective wave soldering cassettes Bottom pre-heating wave soldering machine We have one component that will not solder properly: http://www.epcos.com/web/generator/Web/Sections/ProductCatalog/Capacitors/Ul
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