Electronics Forum | Wed Nov 29 20:49:14 EST 2006 | davef
According to J-STD-033B, 3.1 Requirements: The levels are determined per J-STD-020 and/or per JESD22-A113 plus reliability testing. Look here: http://www.jedec.org/download/search/jstd020c.pdf
Electronics Forum | Mon Apr 09 14:53:19 EDT 2007 | flipit
Hi, We were running with few defects with lead solder paste. The lead solder paste with stencil 0.010" X 0.020" and 0.004" thick stencil produced near defect free PCB assys. 0.010" X 0.020" (0.004" thick) lead = defect free 0.010" X 0.020" (0.005"
Electronics Forum | Tue Jun 07 19:24:44 EDT 2005 | russ
We use a .010" - .012" gap with .020" square pads.
Electronics Forum | Fri Jan 04 09:01:35 EST 2008 | davef
Here's a link to the article that Loco references in the above post: http://www.smtnet.com/library/files/upload/DevelopingaReliable.pdf The table seems to be taking a simplistic approach. J-STD-020C, Table 4-2 lists nine catagories of MSL classific
Electronics Forum | Thu May 18 15:04:13 EDT 2000 | Dirk McCoy
I have heard the following from various sources (that I believe) that apply to volume manufacturers as of late last year: dpmo with BGAs- 300 dpmo with .020" pitch- 75 dpmo with 0402s and .020" pitch- 40 Our lines run around 90-200, but have some p
Electronics Forum | Fri Sep 11 16:52:00 EDT 1998 | Dave F
0.050" -> 50 mil -> 50 pitch 0.80 mm -> 0.032" -> 32 mil -> 32 pitch 0.64 mm -> 0.025" -> 25 mil -> 25 pitch 0.50 mm -> 0.020" -> 20 mil -> 20 pitch 0.40 mm -> 0.016" -> 16 mil -> 16 pitch 0.20 mm -> 0.012" -> 12 mil -> 12 pitch Dave F
Electronics Forum | Thu Nov 08 19:56:08 EST 2007 | davef
Josh: Your 0.009" [0.228 mm] clearance should be fine. The minimum clearance should be ~0.008" [0.20 mm]. Is the 0.039" [0.99 mm] the measured or the expected hole diameter? While we wouldn't like it, we wouldn't be surprised to see 0.008" [0.20 mm
Electronics Forum | Thu Oct 20 20:44:15 EDT 2011 | davef
Design based on: * IPC-SM-782A: Gap 0.0157", Pad 0.0354"X0.0276" [along gap] * IPC-SM-782A Mod used on 32411A1 & Volvo Smart Switch: Gap 0.0157", Pad 0.020"X0.020" [along gap] * IPC-7351: Gap 0.008", Pad 0.0256"X0.0256" [along gap]
Electronics Forum | Mon Sep 14 09:25:49 EDT 1998 | Dave F
0.050" -> 50 mil -> 50 pitch | 0.80 mm -> 0.032" -> 32 mil -> 32 pitch | 0.64 mm -> 0.025" -> 25 mil -> 25 pitch | 0.50 mm -> 0.020" -> 20 mil -> 20 pitch | 0.40 mm -> 0.016" -> 16 mil -> 16 pitch | 0.20 mm -> 0.012" -> 12 mil -> 12 pitch | Dave F Y
Electronics Forum | Mon Feb 21 17:56:44 EST 2005 | davef
You want approximately 5 particles minimum across the smallest aperture. So in the case of a 0.8mm device, we use .017" pads with a round 0.020" aperture on a 6 thou thick stencil foils. Here, 0.020" diameter equals 0.50mm. This gives us 0.50/5=10
