Electronics Forum: (4) (Page 511 of 630)

Re: problem in micro-BGA assembly

Electronics Forum | Thu Jun 24 18:24:13 EDT 1999 | Christian N.

Dear guys, I have some problem on assembling micro-BGA with solder paste (63/37). The micro-BGA we assmeble is 0.75mm pitch and with 45 pin (solder bump is 96.5/3.5Ag). The stencil is a laser-cut stencil with 5 mil thickness. We are now usin

Re: problem in micro-BGA assembly

Electronics Forum | Thu Jul 01 13:57:57 EDT 1999 | Kris Wiederhold

Dear guys, I have some problem on assembling micro-BGA with solder paste (63/37). The micro-BGA we assmeble is 0.75mm pitch and with 45 pin (solder bump is 96.5/3.5Ag). The stencil is a laser-cut stencil with 5 mil thickness. We are now usin

Re: Pre-baking derating

Electronics Forum | Fri Jun 18 12:11:20 EDT 1999 | John Thorup

A user of one of our components exceeded the floor life of some plastic BGA components. They did do a pre-bake prior to SMT reflow but only 72 hrs at 40C and not the recommended 12 hours at 125C. I've recommended accoustic microscopy to look for po

Re: Metal based PCB reflow.

Electronics Forum | Wed Jun 09 17:29:59 EDT 1999 | Earl Moon

I am starting a new project which involve 3 oz copper layer with 20 mil components on the top of the board and 0.040" thick copper with D2Pak on the bottom of the board. There is anybody has experience on metal-based PCB reflow process? I guess

Re: Metal based PCB reflow.

Electronics Forum | Thu Jun 10 11:23:10 EDT 1999 | Gang Pan

I am starting a new project which involve 3 oz copper layer with 20 mil components on the top of the board and 0.040" thick copper with D2Pak on the bottom of the board. There is anybody has experience on metal-based PCB reflow process? I g

Re: quoting smt

Electronics Forum | Wed Jun 09 17:53:06 EDT 1999 | Tom B.

I am interested in seeing how some of you quote smt work. Currently we quote off a bom without component packages known then look in data books to find out what type of component they are. This job will be mine soon but i really believe there is a

Re: Repair of SMT boards

Electronics Forum | Sat Jun 05 07:23:20 EDT 1999 | Dave F

Where I can find some informations about repairing of SMT boards? Thanks Marcos Marcos: Ya know, repair is that "dirty little" part of the business that all try to ignore, don't want to fund properly, and creats more angst than propa

Re: Multitroniks???????

Electronics Forum | Wed Jun 02 17:52:01 EDT 1999 | Dave F

How do you like you�r Multitroniks machine, Reliable User friendly Support Any info would be helpful Looking for info on the new ones and the old ones UFP 9000, UFP 6000 Thanks MD Cox Mike: To help keep bot

Re: Frameless stencils

Electronics Forum | Sat May 29 22:10:28 EDT 1999 | Earl Moon

We are looking into frameless stencil systems for screen printing. Outside frame size of 29x29. Pros: smaller storage requirements and cheaper stencils. Cons: sharp metal edges, additional change over time required Can anyone relay

Re: Intrusive reflow..from the bottom..????

Electronics Forum | Fri May 21 04:03:46 EDT 1999 | Joe Manzur

John, Were doing an intrusive reflow process on a single sided board, where all the conventional parts are on the "top" of the board. Due to the nature of the board, and the kind of componets on it, we couldn't wave solder it. To keep it contai


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