Electronics Forum | Sat Apr 22 13:54:02 EDT 2000 | JAX
What's Up Big Man, Although I agree with a few things Dean said, personally I like back-light. But since you probably won't listen to me here's is the suggested info: Lead_check area= 60% Vision type= 120 P_pattern= 34 This rest is part dependant
Electronics Forum | Thu Apr 06 08:31:13 EDT 2000 | D Scott
Angela Do you see this problem on other .5mm pitch devices or is it only on the QFP? Check placement height, too low or to high can cause you problems Pad co-planarity, are your boards HASL? Is your board sagging during placement(board supports) An
Electronics Forum | Sat Mar 25 12:13:13 EST 2000 | JAX
Robert, Have you checked for any form of contamination that might cause the solder not to adhere to the balls? From the pictures you have on the net it appears that you have too much solder on the pads. What thickness is your stencil? If it is to sp
Electronics Forum | Sat Mar 18 07:33:34 EST 2000 | Dave F
Jack: Two concerns with column devices: 1 Coplaniarity of the device and the board. 2 Adequate solder that you mentioned, becuase the columns will not be reflowing and you need to cloatthem with solder. You didn't describe your aperture, but even
Electronics Forum | Mon Mar 20 10:54:36 EST 2000 | Glenn Robertson
Jack - The last time I checked IBM was specifying a minimum of 4800 cubic mils of paste for each pad. This is required for acceptable reliability, not just to make the connection. There is no way you are getting that volume with a 5 mil stencil
Electronics Forum | Fri Feb 25 10:23:46 EST 2000 | K3 Equipment
Greg, If you are having a problem, i would first check board manufacturers process. Also are they shipping boards to you in seal packages (a must if you are in a humid part of the country.) Most of the time with a few simple process controls moistur
Electronics Forum | Tue Jan 16 14:10:14 EST 2001 | bdoyle
what was the error message you were receiving? I just did a search for BGA in the forum using the search on the gray bar at the top and it yielded 71 results. I didn't have any errors when I clicked on them. Email me if you have continued troubles
Electronics Forum | Tue Jan 30 15:30:17 EST 2001 | dason_c
Please check what is the actual pitch size. I found some of the designer use 15.7 mil pitch and no accumulate ie 15.7, 15.7 and 15.8...... Also, I recommended the pad width should be 10 - 11 mil for 0.4mm pitch. You can open the 10 - 10.5 mil aper
Electronics Forum | Tue Feb 13 06:31:48 EST 2001 | jackofalltrades
I have been tasked with the job of developing Fiber Optic Repair procedures, most importantly cutting and splicing. Cleaning and checking, we have procedures for already. Now for my question, does anyone know of a "How To" site that may be able to gi
Electronics Forum | Thu Mar 08 01:19:16 EST 2001 | Mike Moninger
The environment essentially defines the need for coating. "Inside" may mean inside a men's locker room with attendant high humidity or inside a climate-controlled clean environment. Conformal coatings offer protection against moisture, fungus, chemi
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