RE>ASSY: PQFP pull test 12/13/96 William, I seem to remember that for 25 mil pitch PQFPs, we were getting about 1-2 pounds, and for 50 mil pitch devices about 3-6 pounds. I seem to remember them as "typical". In my opinion, you start to run into problems when you try to classify them as "good" or "bad" without comparing them to a baseline. I don't believe that you can use this kind of test as a means of predicting reliability, although I realize that others don't share this view. I believe that this test is helpful as a process development or process control tool. This is where the baseline comes in. This leads to the second part of your question. It's vital that your test method be consistent to obtain valid data. You should be careful with package excision (be careful not to disturb the solder joints - we found that either a slow speed, oil-cooled diamond saw or a laser worked well), lead clamping method, angle of pull (we opted for 90 degrees, and this was kept constant throughout the test), and crosshead speed (we opted for 0.2 inch/minute). Good luck! Greg Bartlett Mercury Computer Systems Chelmsford, MA [log in to unmask] -------------------------------------- Date: 12/11/96 7:17 PM To: Greg Bartlett From: William Hart/HNS What should be typical pull test results on PQFP leads (160 pin). Good? Marginal? Bad? How does one do this test (where do you pull, & at what angle to the lead do you pull, etc)? *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************