Electronics Forum | Thu May 09 17:16:16 EDT 2002 | davef
Russ makes a good point. While your profile probably meets your paste supplier recommendations, it may not be proper for the component. * Paste suppliers offer general recommendations for tin / lead interconnects. You need to modify that for board
Electronics Forum | Wed May 19 07:38:42 EDT 2004 | Bob L.
I'm trying to help one of our remote sites solve a problem with a warped PBGA. The corners are lifted, creating columnar joints and the central balls are sometimes shorting. I've verified that it's not popcorning and I've got samples going to the l
Electronics Forum | Thu Jun 02 11:01:28 EDT 2005 | davef
Xilinx recommended reflow ||Sn-Pb Eutetic||Sn-Pb Eutetic ||Pb-Free||Pb-Free Profile Feature||Large Body||Small Body||Large Body||Small Body Average ramp-up rate (TL-TP), *C/seconds max||3||3||3||3 Preheat - Temperature Min (Tsmin), *C||100||100||150|
Electronics Forum | Wed Jan 17 09:32:09 EST 2007 | Jeff
Hi, I am having problems reworking a lead free PBGA (23mm x 23mm, 1mm pitch). The board is relatively small (5" X 4" X 0.063"). During the removal stage, a thermocouple was placed at the solder ball level (between the board and underneath of compo
Electronics Forum | Wed Nov 19 20:07:05 EST 2008 | davef
First, it's GREAT to have a long-term lurker posting here on SMTnet. Maybe this will encourage other lurkers to join us. [We'll try to be on our best behavior.] Second, while Stephen Pence's explanation of 'equivalence factors' is accurate, your con
Electronics Forum | Thu Nov 20 06:43:42 EST 2008 | sjpence
I'm not sure I completely agree with you regarding the smoke screen factor. I have found many times confusion around bulk ionic testing comes down to people not understanding your point about it not being a "standard or absolute value". Most people
Electronics Forum | Thu Nov 20 19:47:04 EST 2008 | davef
Steve In response to your comments: SP: I'm not sure I completely agree with you regarding the smoke screen factor. I have found many times confusion around bulk ionic testing comes down to people not understanding your point about it not being a "
Electronics Forum | Fri Nov 22 10:38:30 EST 2002 | slthomas
The follwing is from the Technet archives, per IPC's Jack Crawford. I dug it up during some investigation of a supplier's issues with humidity in an Asian plant: There is support for this in IPD-HDBK-001 w/Amendment 1 Handbook and Guide to Suppleme
Electronics Forum | Sat Nov 22 09:27:18 EST 2008 | davef
IPC-HDBK-001 w/Amendment 1 Handbook and Guide to Supplement J-STD-001 (Includes J-STD-001B to C Comparison). During fabrication and storage, both components and PWBs will often absorb water. If left in the device, this water will vaporize at solderi
Electronics Forum | Fri Jan 24 09:52:08 EST 2014 | davem
Hi Guys, So I work for a small contract manufacturer which caters mainly to the defense sector. As such, our customers haven't (yet) had a great need to incorporate 01005's into their designs. Looking forward, we decided to "take the plunge" and dia
