Electronics Forum | Thu Mar 02 15:20:13 EST 2000 | Glenn Robertson
Dave - You certainly have a good point regarding the multiple part numbers and board suppliers, but a rework process for black pad has been reported. See the SMTAI 1999 Proceedings article by Zequn Mei (page 407). It involves flux and solder wi
Electronics Forum | Wed Mar 01 16:59:44 EST 2000 | Dave F
Robert: Expect a 0.033" raw ball to be within 0.022" of the pad, after reflow. To be clear, that�s not a matter of shrinking by 33%. The volume of solder on the pad is the same as the volume of solder in the raw ball. It�s just that the solder is
Electronics Forum | Wed Mar 01 17:29:30 EST 2000 | Eldon Sanders
Thanks Dave for your reply. I have found a supplier that can cut it, but I am trying to save the tooling cost and the minimum purchase dollar ammount imposed by the supplier. If an off the shelf item existed I could buy what I wanted when I wanted.
Electronics Forum | Sat Feb 26 09:22:19 EST 2000 | Dave F
Jason: Assuming you wantto reuse the TSOPs, two things come to mind: 1 Don't bend the leads. This can be caused by not melting the solder on all leads at the same time. 2 Don't break the body. This can be caused by moisure absorbed by the case ex
Electronics Forum | Fri Feb 25 16:04:18 EST 2000 | Dave F
Sze-Pei: Are talking BGAs here? Flux type? Profile? Pad material? Aperture size? We won�t want to give people too many hints on what the problem is would we? BGA voiding is a function of materials, methods, environment, and human factors. Con
Electronics Forum | Thu Feb 24 21:47:22 EST 2000 | Dave F
Interesting, Gary. Try this: 1 Assess candidate solders by reviewing J-STD-006 (http://canfieldmetals.com/j-std006.htm) to determine solder formulations that have liquidous temperatures in the desired range. 2 Request recommended profiles from supp
Electronics Forum | Thu Feb 24 13:12:38 EST 2000 | Dave F
Ver: The best thing I could do is send you to Bob Willis' site (www.bobwillis.co.uk or something like that), suggest that you root-around there and find one of his procedures that will help you, and come back and we'll refine your process. Good luc
Electronics Forum | Mon Feb 21 22:36:19 EST 2000 | Dave F
Cedric: I know you said "5KE36CA." Motorola, Fairchild, and some others make a zener transient suppressor 1.5KExxCA. The CA suffix makes it bidirectional. Actually, Motorola is no longer in the business. On Semiconductor (www.onsemi.com) sells t
Electronics Forum | Thu Feb 15 08:21:48 EST 2001 | CAL
Dave F. I would like to take that a step further. When I go to the Industry Directory and search by category it bring back the original "Newest Additions" page. It does not allow me to search by manufacturers,consultants....and so on. If I search by
Electronics Forum | Wed Feb 07 12:56:00 EST 2001 | jax
I' ll have to agree with Dave on this one. Just get the information from the Suppliers. The Glass plate, Aluminum board, Glass slugs, etc... are all used to determine if a calibration is needed or if it was succesful.( they can also give you offset i
