Electronics Forum | Wed Jul 13 17:50:26 EDT 2016 | davef
From "Assembly" magazine, "Moisture-Sensitive Devices" [ http://www.assemblymag.com/articles/85082-moisture-sensitive-devices ] ... a description of the moisture sensitive device problem. I agree with Evtimov * During board assembly solder process,
Electronics Forum | Mon Jul 12 20:26:10 EDT 2021 | stephendo
A test that I would like to see is, expose parts for 24 hours 40%-60% RH, 25C for 24 hours. Then seal with a HIC and minimum desiccant that Jstd 33 requires. Five to seven days later open and see if HIC says good but parts have excess moisture. I t
Electronics Forum | Tue Jul 07 13:05:43 EDT 1998 | Bruce Carnegie
We're running mixed technology boards with moisture sensitive devices on the top side thru our wave machine. Should I be worrying about "popcorning" these devices if they have been sitting out collecting moisture between the application of SM devices
Electronics Forum | Thu May 09 17:28:33 EDT 2002 | davef
There is no IPC specification, nor should there be. * There are just too many peculiarities in the design and fabrication of PWB. * The issue is not defining how to store boards. The issue setting expectation for reliable products and allowing you th
Electronics Forum | Mon Nov 19 09:04:21 EST 2007 | rgduval
We determined moisture more as a diagnosis based on omission. We eliminated the other variables, noted that the parts were cracking in reflow, and deducted that it was trapped moisture. As the moisture expands, the component can be cracked/destroye
Electronics Forum | Mon Nov 24 07:36:15 EST 2008 | davef
No, but we find discussions about relative humidity fairly short sighted, because relative humidity is such an imperfect measure of the amount of moisure in the air. Dew point is much more appealing. R.H. = (amount of moisture)/(maximum amount that
Electronics Forum | Thu Dec 09 10:40:45 EST 2010 | grahamcooper22
MSL 3 means you can have the devices open for a maximum of 168 hours in an atmosphere of less then or equal to 30 C and 60% RH. If the humidity is less then 60% then it means the devices will absorb less moisture in a given time, but even at 40% RH y
Electronics Forum | Thu May 20 15:07:12 EDT 1999 | JohnW
Earl, your colourful impressive descrptions are a joy to read..well lighten's up my day but maybe it's just me...ummmm..? anyhoo, Omat, as Earl has said ..this is a moisture sensative problem basically the reason you blow the shit out of the compon
Electronics Forum | Sat May 22 19:38:59 EDT 1999 | Omat Marasigan
| Earl, | | your colourful impressive descrptions are a joy to read..well lighten's up my day but maybe it's just me...ummmm..? | | anyhoo, Omat, as Earl has said ..this is a moisture sensative problem basically the reason you blow the shit out of
