Electronics Forum | Tue Sep 19 14:40:13 EDT 2000 | Erick Russell
It is always a good idea to heat the entire board to 100C to 140C prior to reflowing the site to be reworked to reduce warp and localized stress. (Thermal uniformity of the preheater is key here). For a BGA, the laser is programmed to heat only the
Electronics Forum | Tue Nov 09 16:12:17 EST 2004 | davef
Thermally conductive epoxies are rarely used to hold components in-place. They are more likely used as fillers between two surfaces. Yes, single part glues without an activator are available that are suitable for screen printing or dispensing. Som
Electronics Forum | Wed Aug 12 22:28:20 EDT 2009 | boardhouse
When choosing materials, do you specify your > thermal PCB needs? For instance, are you > specifying temperature or are you selecting > materials by brand name? With this type of product I would call out the material Manufacture and brand - Such
Electronics Forum | Thu Dec 14 19:38:28 EST 2000 | Dave F
OK, now let me ask the really dopey question ... so if the irregularity of the HASL surface is punching holes in the thermal gasket and causing shorts to the heat sink, why are you putting solder on that surface? I wonder how the thermal conductivit
Electronics Forum | Fri Aug 03 19:03:32 EDT 2001 | seand
Hello John, What is the key reason requiring that this unknown material be injected from below vs. dispensed prior to placement. Is it an issue with reflow temperatures, effect on placement/thermal expansion? Is this a true requirement or specul
Electronics Forum | Tue Apr 17 09:19:11 EDT 2001 | Terry Burnette
Dave, I use Dexter Hysol epoxy 9340 gray. It's a two part epoxy kit. Thermally conductive and electrically insulative. Cures in about 10 minutes at 100C. Terry
Electronics Forum | Mon Dec 18 09:42:44 EST 2000 | floydl
When designing high performance circuit boards are there methods that can be used to improve thermal conductivity without using heat sinks? Can boards be designed in a way that reduces or eliminates the need for sinks?
Electronics Forum | Mon Dec 18 10:50:14 EST 2000 | Charles Harper
Thermagon,Inc,in Cleveland,OH has a product line of high thermal conductivity circuit boards which you should investigate.Check www.thermagon.com and/or call Paul Klouda at 216-939-2310.The 216 area code might have changed to 440.
Electronics Forum | Wed Aug 01 11:57:55 EDT 2001 | mparker
It's amazing the eclectic applications that Silly Putty works for, what the heck, give it a shot! One question, seriously, what are the QFP dimensions? x, y, z? can you stand for the injected material to flow past the leads?
Electronics Forum | Wed Aug 01 12:34:12 EDT 2001 | JohnW
The material has to be injected from beneath the component, it's a 240 pin QFP, ideally I wouldn't want the material gong past teh leads as I have to have the option to rework the thing if, perish the thought, it fail's and need's fixed.....