Electronics Forum | Mon May 27 18:16:28 EDT 2002 | Carol Stirling
Hi, I'm looking for Temporary Stencils to assist placement using a Sniper Rework Station. The PBGA is a MPC555 Motorola with 272 pins. The ball map shows 4 populated outer rows, then 16 balls in the centre of an open, unpopulated area. Could I g
Electronics Forum | Tue May 28 08:34:00 EDT 2002 | Hussman69
Hello, I know I will probably get a dozen "check the archives" answers, but what the heck. What is YOUR typical polarity mark for SMT devices? Do you use silk screen or cut a corner off a pad? How do you identify pin one on ICs? Let me know and
Electronics Forum | Mon Jun 03 22:16:49 EDT 2002 | alex_kirichenko
Hi Jim! Just an idea.... There are some reflow ovens which use cooling on the bottom side of pcb during reflow for doublesided boards. It prevents solder on the bottom side to melt. You might try cooling your BGA while reflowing parts on opposit s
Electronics Forum | Thu May 30 20:09:58 EDT 2002 | myu
Thank you very much, Dave and Steve. I got paste and wire from Indium and Qualitek. Are there anybody with high-temperature reflow experience (330 degree C)? Is it OK to use Regular Convection Reflow Oven (We have a Conceptronic HVC 70, 5 zones) ?
Electronics Forum | Wed May 29 15:44:59 EDT 2002 | Jacob Lacourse
Hi, All Our board design requires us to selectively plate some connector pads with gold. The problem is we have changed board houses and they charge a heafty amount to mask the rest of the board. One option is to allow them to plate the whole bo
Electronics Forum | Wed May 29 19:12:25 EDT 2002 | russ
If Gold gets to thick you will end up with brittle joints that break! Hard gold plating is usually about 50 microns thick (is that right?) whereas gold immersion is around 7-13 from what I have seen. i once use gold plating on an entire board and ha
Electronics Forum | Wed May 29 19:17:17 EDT 2002 | russ
We are starting to see a large increase in the use of through board gold plated connectors that require hand soldering with the limitation of .o6" encroachment up the pin. What is the best way to accomplish this? we currently scrap about 5-10% of t
Electronics Forum | Fri May 31 09:09:21 EDT 2002 | russ
Dave, you would be correct in this application. I wish I could prevent these products from coming into our shop, but... I do like the idea of press fit and I will have to research on the availability and persuade the customers to change. I was wond
Electronics Forum | Fri May 31 14:02:23 EDT 2002 | dougt
Russ We decided to use a PC-104 brd for a piece of equipment and had to make a "PC-104 Adaptor Brd" as it is affectionately known. The actual PC104 connectors came with what they called a solder system, a flat piece of solder with holes in it that w
Electronics Forum | Thu Jun 06 13:17:33 EDT 2002 | Hussman69
Don't forget squeegee type and angle. (Am I an Ian wanna be or what?) I'd leave out different types of solder paste. For measurement, use something like a Cyber Centry. It may cost a little, but if you're serious, it's worth it. Other wise you m
