Electronics Forum | Wed Aug 06 10:25:28 EDT 2003 | mleber
Thanks to all who have responded. The boards we are waving are approximately 14X14. SMT bottomside, lots of Dips topside, M39014 caps, and a variety of resistors and diodes. Lead to hole ratio looks good. Board thickness is .090". Picture frame palle
Electronics Forum | Mon Aug 11 17:42:52 EDT 2003 | Kris
How can one go about defining the complexity of a PCB for characterizing reflow profiles A large balanced board may be easier to profile than smaller unbalanced board ? Any ideas how to define an index to calculate the complexity based on size,weig
Electronics Forum | Fri Aug 15 19:52:38 EDT 2003 | Jay
Dave, By Mishandled OSP i meant that it had been touched by bare hands (including pads). Its not like I want to or I donot want to bake these boards. Its just that i want to be sure that the boards will be good to use. And I like your idea to apply
Electronics Forum | Tue Sep 09 18:07:18 EDT 2003 | davef
We would be very wary of allowing 50 uinches, because this will likely result in reduced shelf life due to intermetallic growth. As a guesstimate, at least 10 uinches of that 50 uinches, and maybe more, is already intermetallic when you receive the b
Electronics Forum | Fri Sep 12 09:10:23 EDT 2003 | Norm Morikawa
Around 1989 I had this probelmm with a SMT CCA that would not solder in one area consistently. I had it cross sectioned by the bare board supplier and found that under their metallurgical microscope the thickness of this HASL bare board could not be
Electronics Forum | Wed Oct 01 21:22:37 EDT 2003 | ramanandkini
We have a 1.6 mm thick automotive PCB board of size 35x70mm. One of our vendor has given us a batch with lesser soldermask thickness 5~8 microns. Will this affect the circuit board on a long term. What should be standard for the soldermask thickness?
Electronics Forum | Mon Oct 13 10:30:49 EDT 2003 | markhoch
PCB is 12.25" x 4". There are large MOSFETS on the board. Two large Electrolytic Caps. Two Large Multi-Layer Ceramic Caps. 15 C Size Tantalym Caps. A fair number of IC's, (SO-8's, SO-16's). No BGA's or finepitch of any kind. The board is double sided
Electronics Forum | Tue Oct 28 09:47:50 EST 2003 | woodsmt
It is possible to use a selective wave soldering fixture to "mask" the BGA devices from the wave. Unless you have a very thick board or one that is tough to heat, you should have no problem with BGA. Of course you should run some process experime
Electronics Forum | Wed Dec 10 10:36:42 EST 2003 | russ
I would contact your PCB supplier, they usually have some type of software for panel optimization. Each shop potentially uses different size panels so it is a good idea to ask them what they are using and go from there. Keep in mind that there are
Electronics Forum | Mon Jan 19 09:49:20 EST 2004 | davef
Not as such. Choices are: 1 Cut and epoxy some board foil from your board fabricator. 2 Sacrifice part a pad repair kits from the likes of: * Engineering Lab 905-785-1982 * Circuit Technology Center 978-374-5000 * General assembly suppliers catalog
Major in whole line of SMT equipment, especially in Mounting And printing and AOI SPI, Serve Parts and acceccories.
Training Provider / Manufacturer / Equipment Dealer / Broker / Auctions / Consultant / Service Provider
Floor 1,D Building,B area,Dongsheng Techwin Park,Bao'an District
Shenzhen, 30 China
Phone: 008618566662725
