Electronics Forum | Thu Jun 19 14:44:53 EDT 2008 | guqing
Did you ever run big electrolytic caps on your board?
Electronics Forum | Fri Sep 07 12:19:20 EDT 2007 | guqing
We are having problem to develop lead-free (SAC305) reflow profile for big SMT electrolytic caps. The delta T of the joint of the cap with the rest of the board is too big to fit in the tighter lead-free window. Any suggestions regarding the total pr
Electronics Forum | Thu Jun 19 14:33:57 EDT 2008 | realchunks
My board reaches 240 C for 45 seconds. Most of my lead free parts require 230 C for a minimum of 30 seconds.
Electronics Forum | Mon Jan 26 04:13:48 EST 2004 | patthemack
First of all, did you profile this board with a mole, such as a KIC? Is the solder flowing, or just not wetting to the part or pad? I work with RF boards as well, but the main problem is tombstoning due to the ground plane side being larger because o
Electronics Forum | Fri Nov 11 03:19:29 EST 2022 | angela t
There is a big difference between SMD and SMT. One term denotes a device and the other a process.SMD, or surface mount devices, are electronic resistors that sit on a printed circuit board (PCB).SMT, or surface mount technology, is a method of placin
Electronics Forum | Wed Jan 28 20:58:16 EST 2004 | davef
Vinny: From a thermal standpoint, your choices are: * Get your customer to design thermal relief in the board. * Set your thermal recipe to assure that the grounded pad reaches reflow temperature. This may require a long soak at a single temperature
Electronics Forum | Tue Feb 10 15:13:06 EST 2004 | patthemack
Hey Vinny, Sorry I haven't looked at this for a while. 3 things to try: Tombstoning- The ground plane side is larger because the solder mask allows for a little slop at the board shop (clearance around a pad of a few mils). Since there is not a defi
Electronics Forum | Thu May 23 13:00:51 EDT 2002 | cyber_wolf
One more thing I want to add. Don't turn this into some big deal. Its not atom splitting, or black majic.Bottom line is that you are going to be doing some experiments to prove it to yourself and whomever else requires the data. Profiling is time con
Electronics Forum | Mon Aug 27 15:50:05 EDT 2001 | seand
Hello Everyone, The MPM UP 3000 may be a good bet for your Screenprinting application and I am aware that there are a few in inventory at Speedline Technologies (MPM) that you should be able to get with a warranty for a good price. I know wide vers
Electronics Forum | Mon Mar 02 10:23:46 EST 2009 | wrongway
You may need a glue despinser if you populate bottom side then wave. maybe a board deatacker at front of the line how about a multifunction pick and place machine so you can process all parts out there. we cleaned our stencils for years then we got a
