Electronics Forum | Thu Mar 16 03:45:51 EDT 2017 | rob
It's the same thermal issue whether it's a die or package. It's different if it is just a signal trace, but if it's a heatsink pad (LED, FET, Motor driver, PSU IC etc). I think the voiding issue boils down to what the part is actually doing. The or
Electronics Forum | Thu Mar 16 22:19:38 EDT 2017 | deanm
First, reflow does not reset the clock for MSL exposure. The best solution is to run the second side before the exposure time expires. I am curious to know why they must sit for 40 hours. If that cannot be done, then store the assemblies in a dry c
Electronics Forum | Wed Aug 09 20:03:22 EDT 2017 | ttheis
We're having problems with Kester pastes (NP545 pb free and EP265 60/40 no clean pastes.) All of our other components reflow just fine with either paste, but for some reason this QFN chip doesn't wick to the QFN's pads well. It seems like some type
Electronics Forum | Wed Sep 20 00:31:32 EDT 2017 | v037022
Dear, Now we have some problems related to flux inside Reflow oven (Tamura oven, 7 zones). Flux drop on PCB so much. It has 2 kind of flux: wet and dry. We did maintenance cleanly reflow oven but it still happen. We are planning to test new setting o
Electronics Forum | Mon Oct 30 12:07:42 EDT 2017 | slthomas
One thing that most of the sites I've worked in did NOT have was a room dedicated to SMT and the result is almost always a potentially dirty environment, even if you try hard to keep it clean. The one place I worked where they built a room specific
Electronics Forum | Fri Feb 09 14:04:22 EST 2018 | ameenullakhan
Hi Justin, The solder paste we are monitoring well. And there is thawing machine to make sure solder paste is not opened early, before it reaches its ambient temperature. we have got a suggestion that , it might be from PCB enig surface finish. Mig
Electronics Forum | Mon Mar 26 19:22:22 EDT 2018 | tey422
First of all, shouldn't allow SMT operators to edit/create recipes, only grant access to the well-trained only. You will put yourself at risk if you don't have good process rule of oven recipes. Newer oven models should come with software that has m
Electronics Forum | Sun Mar 25 08:45:00 EDT 2018 | jacobidiego
Normally some random components of size 0604 or below and may be due to a thermal mass being close like a transformer or AC electrolytic caps. We tried changing fan speed, but this will change the thermal profile and avoid the thermal mass from bein
Electronics Forum | Tue Mar 27 01:52:23 EDT 2018 | buckcho
Hello Diego, are the components missing on the first side or the second side. Like Mr. Evtimov said, you can check before the oven the pcbs's visually and see what happens after the oven. In this way you can see if it is the oven for sure. Then there
Electronics Forum | Wed Nov 21 06:01:57 EST 2018 | premkumar_haribabu
Hi Davef, Thanks for your quick reply , just my inputs - we using 99.99 % pure nickel strip for soldeirng & when we do manual soldering this nickle stips its working well but when coming to SMT reflow even after high peak temperature ,its removes ev
