Electronics Forum | Fri Mar 19 15:44:35 EDT 2010 | cisridn
Coins are sometimes used on PCB's with RF Power Field Effect Transistors. These boards are usually mounted in an housing. They provide a ground path for the transistor to the PCB and thermal path to the housing. The coins are usually made of aluminu
Electronics Forum | Mon Dec 20 14:44:30 EST 2004 | JohnS
I had identical issue with CBGA's. I also found stress fractures at the sphere/substrate interconnect. The supplier had data to support their acceptability but we persisted and they reworked them,
Electronics Forum | Thu Aug 13 07:53:40 EDT 1998 | Earl Moon
| | Couple of questions. | | 1) Are we talking alumina substrates as the ceramic material? | | 2) Are we co-firing gold as the conductors on the substrate surface? | | 3) In other words, is this a hybrid thick film circuit? | | 4) If so, how large or
Electronics Forum | Fri Sep 26 08:15:01 EDT 2003 | Gabriele
Forced gas (hot air or N2 according to solder paste or flux) will be the solution. To rework Ceramic (Aluminum lid Heat Sink)BGA (32 mm square ) or Ceramic Colum Grid Array C-CGA 1,25 and 1,00 mm colum (pitch 42,5mm square), also them capped with a
Electronics Forum | Thu Jul 13 02:30:29 EDT 2017 | jandon
We are using hot-plate. It is the safest method to rework aluminum substrate PCB's. http://www.martin-smt.de/en/rework/products/pre-heater-hotbeam.html "For efficient rework on heavy electrical systems with flat bottom surface and LED PCBs the pow
Electronics Forum | Fri Jun 23 09:11:06 EDT 2017 | jchris
I have a few LED pcb's that have an aluminum substrate that are ridiculous to rework. They heat-sink like crazy and I can't reflow the bad LED's, no matter how much heat I apply. Any suggestions on techniques or equipment to use?
Electronics Forum | Wed Jul 12 08:49:38 EDT 2017 | williamaxler
I have a few LED pcb's that have an aluminum > substrate that are ridiculous to rework. They > heat-sink like crazy and I can't reflow the bad > LED's, no matter how much heat I apply. Any > suggestions on techniques or equipment to use? > I ha
Electronics Forum | Fri Jul 07 09:22:17 EDT 2017 | westshoredesign
Are you reflowing them and they are coming out of the oven bad? If so, what kind of oven are you using? What kind of LEDs? What kind of solder? Mass of substrate? Have you ran a profiler through your oven and compared the plot to the solder's spec
