277 0.5mm results

Electronics Forum: 0.5mm (Page 1 of 28)

0.5mm pitch BGA

Electronics Forum | Wed Dec 05 17:44:25 EST 2001 | LloydG

we are in the process of design, plan to use a 0.5 mm pitch BGA. does someone has a recommended footprints. thx!

0.5mm CSP Reliability

Electronics Forum | Fri Apr 25 07:15:50 EDT 2008 | davef

Please post a picture of your cross section.

0.5mm CSP Reliability

Electronics Forum | Wed Apr 23 21:34:24 EDT 2008 | fowlerchang

It is CSP reliability issue, which is the mobile CPU from Spreadtrum. All the tests passed and shipped to customer. They assembly them and tested but failed. After they reflow this CSP with hot air gun, some of the boards passed. We got some board

0.5mm CSP Reliability

Electronics Forum | Thu Apr 24 20:52:03 EDT 2008 | davef

Use of a hot air gun to reflow solder that passes tests [after failing those tests] seems to indicate the standard process reflow was inadequate. To understand this better, we'd want to measure temperatures at various points on the board during reflo

0.5mm CSP Reliability

Electronics Forum | Thu Apr 24 21:52:18 EDT 2008 | fowlerchang

We have measured the temperature of CSP solder joint. The peak temperature is 232oC and the wetting time above 217oC is 30s. But we use leaded solder paste instead of lead free solder paste. I doubt why no crack of solder joint was observed after cr

alignment requirements for 0.5mm pitch

Electronics Forum | Sun May 05 08:13:14 EDT 2002 | andysi

I am curreently in my final year of my HNC Mechatronics course. In the project section I am reviewing several screen printers for their suitability to run a new product containing 0.5mm pitch components. I would be interested in anyones opinion in

alignment requirements for 0.5mm pitch

Electronics Forum | Tue May 07 08:18:12 EDT 2002 | Sir Alexandr

Almst quality of PCB with this pitch defined on used boards. Good board produses Fullmarks , look up to it , stencil parametrs isnt so critical but board material and layouts.

alignment requirements for 0.5mm pitch

Electronics Forum | Thu May 09 17:22:56 EDT 2002 | davef

I have no opinion on the accuracy and repeatability tolerances you should be looking for on the vision system and the actual alignment of the stencil. I expect Cp=2 from my printer.