Electronics Forum | Thu Mar 15 10:28:46 EDT 2007 | cecil
Just askin but why would someone even want to subject an assembly to even 6 reflow cycles? As far as how many cycles that an assembly can be subjected to, wouldn't that be determined my your components?
Electronics Forum | Wed Aug 07 16:06:48 EDT 2024 | SMTA-64386252
Hello, You should contact your PCB suppliers and ask them. Most of PCB suppliers did not recommend exposing PCBs to more than 5 thermal cycles.
Electronics Forum | Fri Jul 12 07:15:45 EDT 2024 | murtaza
Use high tg material on pcbs. Like tg170 or higher. Its a bit more expensive. Board shops usually quote cheapest material just to win the order. When you see fr4 on the quote it usually means tg135-tg140.
Electronics Forum | Tue Aug 17 16:14:31 EDT 2010 | davef
heat cycl*
Electronics Forum | Tue Aug 17 18:54:02 EDT 2010 | rob_thomas
Latest and greatest after discussing w colleagues w experience in commercial electronics. According to the 'Printed Circuits Handbook' by Clyde F Coombs JR, the number of "SMT solder rework cycles per component per board is kept to two-three. Beyond
Electronics Forum | Tue Oct 15 20:33:43 EDT 2002 | davef
First, this is a very interesting question. Second, there is no specification. Third, companies develop guidelines for rework based on their expectations for their product reliability. Things to consider are: * Motorola allows no product shipments
Electronics Forum | Tue Aug 18 17:49:16 EDT 2009 | dyoungquist
Is there a limit to how many times a pcb with components can be run through a reflow oven before the components start to degrade? Example: We load the SMT components on the bottom side of the pcb and run it through the reflow oven. Next we load the
Electronics Forum | Mon Jan 23 19:48:27 EST 2012 | gaz
This make me curious how many people are using sn100 versus how many using sac305. The sn100 seemed to generally cover the pads and flow a little better, and looked nicer, but SAC305 overall was easier. Is this normal or do I need to work more on sa
Electronics Forum | Wed Jan 04 13:59:14 EST 2006 | chunks
Ask your customer why they need this? Show them your process. Then bury them in their own unknowledgeable requests. It is pretty scary how many papers are also written about how easy it is to reflow a lead-free BGA with regular leaded paste. ht
Electronics Forum | Wed Jan 04 10:34:04 EST 2006 | DannyJ
I don't believe you are missing anything, Amol. Mainly, you just need to make sure that your oven handles the higher temperatures needed for reflow. Also, there has been a lot of discussion on how many zones are needed to properly reflow lead-free
winsouce.jpg)