Electronics Forum | Mon Jun 14 14:39:12 EDT 2004 | davef
HASL Thickness: * HADCO DFM manual specifies a nominal thickness of 50-1500uin with an option for 100-1000uin * Merix DFM manual specifies 30-200uin IPC-6012, Class 1, 2, 3 do not spec a HASL thickness at all but only require that full coverage is m
Electronics Forum | Wed Jun 16 16:04:42 EDT 2004 | hulbert
An issue just came up concerning the color of FR-4. By accident we received a prototype board that was blue. We like the looks of it but can not justify a change because it looks cool. My questions are: 1: Why are most common PCB's green? 2: What are
Electronics Forum | Thu Jun 17 06:39:41 EDT 2004 | davef
Q1: Why are most common PCB's green? A1: Tradition Q2: What are the tradeoffs, ie electrical characteristics, etc for changing board colors? Q2: None. We use different colored solder mask on boards to indicate different development stages. See you
Electronics Forum | Mon Jun 21 07:48:23 EDT 2004 | BobL
Contact Jim Marquis at Kimchuk, Inc. (203) 790-7800. They are marketing a rack and stack product that allows you to store the pc boards flat. It is esd safe and eliminates damage from handling boards. I have been in electronic manufacturing for 20 ye
Electronics Forum | Fri Jun 25 18:57:21 EDT 2004 | Pete
One word of caution, depending on the complexity of the boards and package, the Xray on Jewel Box may not be powerful enough to show the voiding defects within the solder sphere. We ran a board side by side against a high end system and find that out
Electronics Forum | Tue Jul 06 10:46:12 EDT 2004 | blnorman
We have now switched to Kester EP256. During our solder paste evaluation, resistance to humidity was one of the selection criteria. We printed multiple boards, then exposed them to 85�F/65% RH. At 30 minutes, 1 hour, 2 hours, and 4 hours exposure
Electronics Forum | Sat Jun 26 15:20:56 EDT 2004 | russ
Are you saying that immediately after the initial assembly process the boards work and then after these same boards sit for 15 days they don't? If that's the case I would suspect contamination maybe. what type of flux are you using and what is your
Electronics Forum | Tue Jul 27 06:08:18 EDT 2004 | C Lampron
Good Morning Everyone, Could someone please tell me what the acceptable range is for HASL plating thickness. We have some raw boards with plating thicknesses ranging from 3-4 mils on a fine pitch QFP. We are expeiencing bridging at this location an
Electronics Forum | Tue Jul 27 11:34:05 EDT 2004 | C Lampron
Nippy, This is exactly what we are seeing. The exessive pads are all on one side of the board. This is a 10 up panel 5x2. All of the QFP's on one side on the panel are not releasing or are not gasketing and causing bridging. So the defects are rangi
Electronics Forum | Wed Aug 04 16:46:40 EDT 2004 | davef
We assume this is different discussion that the discussion about "crystallized flux under BGA". Correct? Milky residue with water washing makes us think "noclean flux res that just got washed". We know what you said, but we can't help ourselves.
