Electronics Forum: 0201 and bga and layout (Page 1 of 1)

0201 and uBGA

Electronics Forum | Wed Jun 05 17:13:58 EDT 2002 | Yannick

Hello! I have a strage problem, we made some production with uBGA, BGA, 0201, 0805, and other type of component. We didn't put the uBGA and 0201 and BGA on the board at the end of the line we look a our solder joint and surprise the solder made a

0201 and uBGA

Electronics Forum | Wed Sep 25 13:38:35 EDT 2002 | finepitch

Yannick, If we leave the 201 issue aside; have you checked where those BGA pads are connected to? Could those be power/ground balls connected to large (difficult to heat up) planes by any chance? Erhan

0201 and uBGA

Electronics Forum | Wed Sep 25 06:56:16 EDT 2002 | CH

U may check your profile ramp rate. The flux may evporated and look like cold joint

0201 and uBGA

Electronics Forum | Wed Jun 05 21:33:12 EDT 2002 | davef

Tough to say based on what you have told us. Things to Determine are: * Is the heat at the solder connections that are not reflowing properly adequate? * Is the pad surface of the solder connections that are not reflowing properly solderable?

0201 and uBGA

Electronics Forum | Mon Sep 23 18:11:10 EDT 2002 | steveb

On an assembly reflowed in air saw the same thing: 0201's with a grainular solder joint, but 0402's and above with perfectly formed joints. Reflow profile all within acceptable tolerances. Reflowing in nitrogen solves this problem, but increases t

0201 and uBGA

Electronics Forum | Wed Sep 25 10:56:27 EDT 2002 | xrayhipp

Yeah, perhaps lean more towards a ramp-to-spike profile - reducing the soak time and add a littel heat to your temp above liquid. This has worked for us with water soluable paste as we are not required to use no-clean and utilizing a 6-zone oven. G

BGA lands and ICT

Electronics Forum | Tue Mar 19 17:30:46 EST 2002 | rculpepp

Does anyone have or know of any published guidelines for BGA layout on PWB's so that they can be tested. Specifically using micro vias? If anyone has any input regarding other test considerations for BGA devices I'd like to hear from you as well. W

Water wash flux and cleaning

Electronics Forum | Mon Jun 19 09:47:23 EDT 2017 | georgetruitt

You have a lot to think about! What does the flux manufacturer recommend as far as specifics like water temp or pressure? Do they recommend high temp di-water a detergent or saponifier? Do you currently have a cleaning machine, batch cleaner or inl

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