Electronics Forum | Tue Dec 29 11:40:24 EST 1998 | Michael Allen
I don't have answers...just comments. We're just starting to assemble CSPs on protos, and I've got the same concerns you have. The MicroBGA package I'm working with has a ball diameter of 0.325mm (0.0128") and a standoff of just 0.010" BEFORE solde
Electronics Forum | Mon Jan 04 23:15:35 EST 1999 | Kris Ewen
Where I worked, we used 0.014" square aperatures (several mfgs. have proven the benefits of square & I've seen a better transfer efficiency myself). Some mfgs use smaller edge lengths & have had success. 0.005" thick stencils give better transfer e
Electronics Forum | Mon Dec 28 15:03:14 EST 1998 | Earl Moon
| We have a Vitronics SMR400N oven and many times need to use N2 inerting. My problem is that it takes close to an hour of operation to purge the system to achieve the desired O2 levels (~40PPM). This is not only time consuming but results in an inor
Electronics Forum | Tue Dec 22 14:29:08 EST 1998 | Earl Moon
| | I have a mixed technology board ranging from 50 mil pitch devices to 20mil Qfp's to PBGA-352 at 1.27mm, and 6 Intel uBGA-48 at 30 mil pitch. With all these different package types i'm torn between using a 4 or 5mil thick stencil. The ball dia. is
Electronics Forum | Fri Dec 18 22:37:09 EST 1998 | phillip hunter
| Okay here is the deal. I am fairly new to the company here, but one thing I have noticed is that we read way to many fiducials, in my opinon anyway. One for example is this. One assembly was reading 17 fids. Smallest pitch was .25mil I say you
Electronics Forum | Sat Dec 05 17:41:07 EST 1998 | Earl Moon
| | | Have either one of you seen or used a SRS machine? I had | | | one in for a demo - very impressive. The original model was | | | a little too awkward for production to use, however, the newer | | | model is a little easier to use. The big
Electronics Forum | Mon Dec 07 18:52:23 EST 1998 | Jason
| | | | Have either one of you seen or used a SRS machine? I had | | | | one in for a demo - very impressive. The original model was | | | | a little too awkward for production to use, however, the newer | | | | model is a little easier to use.
Electronics Forum | Wed Nov 25 01:43:40 EST 1998 | Erhard
| Can anyone tell me why Philips would obsolete my feeders. I am trying to add a newer machine to my line and I am told that the feeders from my 84VZ no longer work. Is this true? | The feeders were all compatible from the Philips CSM 66 up to the
Electronics Forum | Thu Nov 19 11:06:40 EST 1998 | Earl Moon
| We have some PCB�s in our warehouse in Manaus - Brazil. They are stored for more than 2 years , in a condition of 25 degrees centigrades and a humidity ranging from 60% to 90%. | Do these conditions cause the PCB�s to deteriorate over time? If so ,
Electronics Forum | Wed Nov 18 12:59:49 EST 1998 | Earl Moon
| Our company has been building high rel military products for over 15 years. Over that time we have reduced our bare board suppliers to two companies that specilize in 55110 QPL product. | | I am now faced with a requirement for 6000 4 layer boa
.gif)
