Electronics Forum | Thu Jun 10 06:15:45 EDT 2010 | muarty
We currently have a project requiring us to place multiple QFN devices (of various sizes). The pick an place is not a problem at all, where we are seeing 'problems' is that 3 of the devices are being place on locations where the ground pad have plugg
Electronics Forum | Mon Jun 14 08:50:56 EDT 2010 | whitewing
Just been quoted GBP500 for 5kg (2.7L) of Galden LS-230. Don;t know if the lower temp non-leadfree stuff is cheaper If anyone in the UK has a small qty they'd sell me for experimentation, (e.g. old non-leadfree stuff they no longer use) please get in
Electronics Forum | Mon Jun 14 15:18:49 EDT 2010 | jmedernach
Hi Phil, If the areas that are "turning gray" are masked, it would lead me to believe that you're simply oxidizing the SnCuNiGe finish on those areas. It's unsightly but not an actual defect. I think it's simply the biproduct of using SN100C as a s
Electronics Forum | Mon Jun 14 21:22:16 EDT 2010 | mag10
does anyone have experience with SACX0107 solder from Alphametals in Wave compared to SN100 or SAC305? I see better price and good features like less dross. However, the alloy looks like non-eutectic and it has 10 degree difference between liquidus a
Electronics Forum | Wed Jun 16 11:49:55 EDT 2010 | tim_wright
A customer wants to coat a no-clean assembly to cut cost and cycle time. I know what wave flux I can use to make it work, but the Indium SMQ92J paste we use causes dewets. Any other no-clean pastes out there that play nice with acrylic?
Electronics Forum | Wed Jun 30 19:31:40 EDT 2010 | jry74
Tim, try and incorporate an inline wash system. We use one with a surfactant and it cleans the "NO CLEAN" fluxes well. If you dont have an inline system, you can manual clean the boards with an surfactant and IPA. You can also do an ionic contamin
Electronics Forum | Wed Jul 07 11:40:32 EDT 2010 | daxman
Huh... Can you maybe explain a bit more? Are you getting this error on the IP3 monitor or on the programming computer? Do you use MCS, Fuji Cam or Flexa? Will the machine start up and zero-set? At which point of the power-up does the error arise? Are
Electronics Forum | Fri Jun 18 12:33:02 EDT 2010 | bob2000
Davef, Thanks for the reply. I do not know if a radial capacitor needs to be secured with adhesive. The board in question is a class 2 device where high reliability needs to be achieved. I can not find any book references where adhesive application i
Electronics Forum | Fri Jun 25 15:04:39 EDT 2010 | siddharth
Thanks for you suggestions, guys. davef, I am gonna get with my PCB suppliers and talk to them about copper balancing and checking the Tg of the materials they use. SC, I am working towards designing wave pallets for my boards and try your suggesti
Electronics Forum | Tue Jun 29 14:44:26 EDT 2010 | rgduval
There are some good suggestions here...reflow pallets, and copper balancing. We would also suggest verifying that your problem is not caused by moisture. How much time passed between first side and second side reflow, and how humid is the environme
