Electronics Forum | Fri Sep 15 05:48:11 EDT 2000 | carsonho
Have any experience that Sn/Pb plated integrated circuit products will appear some rainbowbridge-like substance after exposing at conditions of 121degC, 100%RH and 15psi for 48hours or above? The rainbow bridge substance was analyzed by EDAX and fou
Electronics Forum | Thu Jul 20 16:56:38 EDT 2000 | Bob Willis
What do you mean good morning, my wine bottle is empty and I feel like sleeping. When will some one invite me back to your country to work again ? I need to do some more diving ? The most common cause is simpley the flux on the surface of the joint.
Electronics Forum | Mon Jun 18 21:21:25 EDT 2001 | davef
Two things: 1 A flat surface will probably help the "balls on the socket sliding off the ridge of HASL" problem, but possibly consider less risky choices for your flat surfaces that immersion silver, like: OSP, ENIG, and immersion tin. 2 Don�t throw-
Electronics Forum | Sun Jul 29 23:58:08 EDT 2001 | Frank
Hi Dave Thanks for your information. The problem that I found is paste not stick well on pads ( solder paste printing process). When the table move down (PCB saperate from stencil) some of paste stick on aperture instead pads. Solder paste : Delta
Electronics Forum | Tue Oct 05 02:47:01 EDT 1999 | Eric
| Hi everyone, I need some help on the whole process of double sided surface mount. We have been doing surface mount for about 3 months and we're getting ready to take on our first doule sided board. I just need some step by step process regarding so
Electronics Forum | Fri Oct 01 14:16:15 EDT 1999 | Rick
I know there are a ton of variables that affect the overall height of a BGA after soldering to a PWB but... I'd like to know if anyone has done an analysis of (or if it's documented) as to what the pre and post reflow height dimension as measured fr
Electronics Forum | Tue Aug 03 17:44:34 EDT 1999 | Earl Moon
| We're getting field failures in a high impedance portion of the circuit. Think the unpopulated pc card has contaminates because we were able to grow dendrites by applying a 9 volt battery across the suspected pad, placed a drop of de-ionized water
Electronics Forum | Wed Jun 16 15:44:52 EDT 1999 | Jagman
| WOULD LIKE TO DO RELOW OF 2 SIDED SMT BOARDS. USUALLY THE BOTTOM SIDE HAS RESISTORS AND CAPS ONLY. WHEN THE BOTTOM OF THE BOARD HEATS UP, THE PARTS ARE FREE TO MOVE AND ONLY SURFACE TENSION WILL KEEP THE COMPONENT FROM FALLING OFF. | CAN BOARDS BE
Electronics Forum | Wed Jun 16 14:14:07 EDT 1999 | Dave F
| Hello, | I am looking for the surface resistivity and volume resistivity of standard fr4 as a function of temperature and /or humidity . can any one help? | Frank: Sorry I'm so late getting back to you. 1 Use either ASTM D5109-94 or IPC-TM-6
Electronics Forum | Fri Jun 18 03:31:38 EDT 1999 | Frank
| | Hello, | | I am looking for the surface resistivity and volume resistivity of standard fr4 as a function of temperature and /or humidity . can any one help? | | | | Frank: Sorry I'm so late getting back to you. | | 1 Use either ASTM D5109-
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