Electronics Forum | Mon Mar 22 07:40:01 EDT 2010 | emanuel
Are you absolutely sure the problem is with the humidity? We had a problem with 3528 size leds, damaged by the pick and place nozzle because a 0.2mm mistake in the height measurement. Also, we found that several suppliers are using fake desiccant ba
Electronics Forum | Mon Sep 20 11:21:48 EDT 2010 | tony1
I have this NiPdAu small QFN packge sizes less than 2x2. I tried to do solderability Dip And Look test and there's always some units no wet on either ground pad and small I/O. Can someone help to explain why is this so difficult to set on this surfac
Electronics Forum | Wed Dec 01 09:44:26 EST 2010 | patrickbruneel
Hegemon, Thank you for the acknowledgment. Jacki, There are 3 rosin flux categories: R – Pure rosin (no cleaning required) RMA – Rosin mildly activated (can be used without cleaning in non critical applications) RA – Rosin highly activated (due t
Electronics Forum | Thu Oct 20 19:13:21 EDT 2011 | eadthem
When you get in to a 30 spindle lightning head or the dual and single beam 7 spindle flexjets from UIC, there generally really solid machines. The only flakeyness we have is with a GC120 (4 beams in 1 box). and of that most of the issues are purely b
Electronics Forum | Fri Mar 20 07:42:44 EDT 2015 | eezday
Dendrite growth is not typically associated with a flux reation but rather is a result of mechanical stress. The stress can be from any source including stress induced by other components, environment, plating or even bimetallics. Dendrites are most
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
Electronics Forum | Tue Mar 07 21:28:30 EST 2023 | stephendo
What purity? To get 99.999% pure you will need dewers of liquid nitrogen or a two stage system. (and a dewer will last about a month and a half even if you don't use it as it outgasses.) But you can get reasonable purity with a wall mounted single s
Electronics Forum | Tue Oct 05 06:03:37 EDT 1999 | Graham Naisbitt
| Hi, | | Help! Could anyone help to enlighten me on this? | | Question: | | If I have a CSP/BGA package of size X by Y and the standoff gap between the component and PCB is Z, What is the maximum allowable Y/Z or X/Z that using a normal water cl
Electronics Forum | Sat Nov 14 08:00:34 EST 1998 | Earl Moon
| Also the preheating of the board is done to help evaporate any water/alcohol that is in the flux - water is a big problem in No-clean processes. From our experience, a temp range around 200f - no more than 220f is ideal for the bigger boards, but t
Electronics Forum | Tue Apr 29 09:43:30 EDT 2003 | davef
With a nickel barrier and 'tin' plating, reconsider your reflow recipe to reduce the leaching of the termination into the solder during reflow. Points are: * In designing a reflow temperature recipe, it is important that the temperature be raised at
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