Electronics Forum | Tue Sep 18 16:48:55 EDT 2001 | jschake
Why do you think that assembling the BGA, QFP, and fine pitch parts will solve your bridging problem? I would think doing this may cause you more grief by having these more massive components being reflowed upside down fall off during the second pas
Electronics Forum | Mon Nov 19 20:15:39 EST 2001 | davef
Now, that is one thickass board!!! The rant first: If our �board supplier changed our board surface finish on� anything without our approval, the board supplier would be an �X�. Life has enough surprises. And of all the flat finishes available, h
Electronics Forum | Mon Mar 04 17:52:59 EST 2002 | davef
Yes, providing the surface of the via is solderable. * If so, how much paste? => Vias come in various sizes. Boards vary in thickness. So, the amount of paste to fill a via varies. Roughly, you�ll need twice as much paste as the volume of the via
Electronics Forum | Wed Mar 06 21:16:17 EST 2002 | davef
�What does 5 micrograms of chloride mean to me?� * With SIR testing, you can show no detrimental leakage currents under humid conditions, no corrosion, no metal migration, which are the big factors in figuring out electrochemical reliability. People
Electronics Forum | Fri Apr 04 09:28:59 EST 2003 | davef
Q1: Anyone has any ideas on how this post-SMT reflow solder joint could have changed to whitish joint? A1: Dunno. You need to tell us more. For instance: * What is the appearance of this white residue? [eg, glassy / coarse, milky colored / opaque,
Electronics Forum | Sat May 24 21:49:24 EDT 2003 | ramanandkini
We have an electronic circuit with a miniature stepper motor, quartz crystal, Electrolytic capacitor,chip resistors and few smt LEDs. The PCB material is CEM1 with SMOBC and HALS finish. This circuit is assembled in a plastic casing and goes in to a
Electronics Forum | Fri Jul 18 10:46:43 EDT 2003 | davef
If you are saying that you have discolored white tin at in-bound inspection, you have bad boards. The boards are fabricated incorrectly. Your fabricator is deficient. That is the GREAT thing about imm coatings. You can look at them and determine
Electronics Forum | Mon Oct 03 22:16:58 EDT 2005 | Ken
If that's the case, let your customer go. I have run into this situation recently. Q. Why do you not run a dedicated line for lead free? A. You (the customer) give less than 12 weeks forcast and expect us to have a dedicated line for your product?
Electronics Forum | Fri Feb 17 13:10:34 EST 2006 | amol_kane
I have Immersion Ag and Immersion Sn LF boards that were waved using SAC305 alloy. I have a lot of tears/shrink voids in the waved connections. I am aware that SAC305 in wave has a propensity of shrink tears/voids due to the non eutectic property of
Electronics Forum | Tue Oct 03 17:04:07 EDT 2006 | cuculi54986@yahoo.com
Glenn, What alloy are you using for Pb-free HASL? You say tin copper nickel, but is it SN100C? Against manufacturing engineering's recommendation, my company specified simply "Pb-free HASL" as the finish for our Pb-free PCBs. One of our suppliers
