Electronics Forum | Wed Jan 02 13:31:55 EST 2002 | PeteC
The rule-of-thumb is to follow the flux mfg.'s recommended profile to achieve their specified top side PCB temperature before making contact with the wave. Typical top side PCB temps are 100-120deg.C. Your wave contact time should be around 2 seconds
Electronics Forum | Mon May 13 10:37:56 EDT 2002 | fmonette
The other important issue relates to moisture sensitive devices (MSD). If you have MSDs on the first side, you need to track the remaining floor life of the components on the partially assembled boards between the first and second reflow. Contrary to
Electronics Forum | Wed May 29 17:17:49 EDT 2002 | wilcoxito
As far as aperture dimensions go, I found a technical note written by Micron that recommends using "square apertures with sides equal in length to the diameter of the PCB pad. The corners of the square should also be slightly rounded, and the apertu
Electronics Forum | Thu May 30 07:28:15 EDT 2002 | jaltland
Ben, Thanks for the input on the apertures and thickness. The side two problem, is not reflow. We have no trouble with reflow. The problem is that our product is high precision crystal oscillators. In order to get the precision needed, we have t
Electronics Forum | Fri Jun 21 12:49:58 EDT 2002 | surinder
Hi Russ, Thanks for your input.My board has SMT Chip components, SOT23,SOIC's & 2QFP (25MIL PITCH). Also,taking consideration that the board is well design for Wave.This board has been designed end of last year. We have latest model of Electrovert ma
Electronics Forum | Tue Jul 30 12:19:38 EDT 2002 | sueph
I am trying to get a profile on a thru-hole board with metalic coating on both sides. My preheaters are about maxed out and my profile is just reaching 200 degeres F. I'm not sure how much I can slow my conveyor down to get more heat. Does any one h
Electronics Forum | Mon Aug 19 20:45:31 EDT 2002 | davef
Bob Willis and Phil Zarrow have had a running commentary on the ability of reflowed solder to hold components on the bottom side during reflow. You can find references to their component weight to pad area rations in the fine SMTnet Archives. The
Electronics Forum | Mon Aug 26 09:50:32 EDT 2002 | zanolli
I want to ascertain the oven profile required for through hole connectors with solder pre-forms. I need to get double sided PCB�s made for that purpose. What is the best way to get these PCB�s made to simulate real world conditions?. Should I leave a
Electronics Forum | Thu Aug 29 12:48:26 EDT 2002 | slthomas
Assuming all things are equal (attention to good DFM guidelines, well trained and capable operators, well maintained equipment, etc.), which would you expect to have the higher process yield, standard SMT/through-hole all topside, or all SMT bottom (
Electronics Forum | Fri Aug 30 17:33:20 EDT 2002 | slthomas
Thanks, guys. Hi Larry, long time no "see". Dave, 60k dots out of a Camalot 2800 does not a "Dispenser Boy" make. :P I'd print them in a heartbeat if the proximity to radial leads didn't necessitate me placing radials first. Oh, wait, I'd have to
