Electronics Forum | Thu Sep 26 20:43:51 EDT 2002 | davef
"OK. If the connection doesn't look like I expect it to look, how do I know that the metallurgy is correct?" Comments are: * There are no pictures that will get you though this. * You should expect that gold that is dissolved in Pb/Sn solder to make
Electronics Forum | Thu Sep 26 11:44:23 EDT 2002 | abelardo
Hello everyone out there in the SMT world. I have a dilema I'm currently running a board that has 3 csp's with a .75 mm. ball pitch and .3mm ball size. And 2 qfp's-160. The stencil is 4 mils thick and I'm using a 63/37 solder paste. My reflow prof
Electronics Forum | Wed Oct 02 16:13:05 EDT 2002 | babe
Have you had your solder pot tested? I find that levels of contaminants can rend a solder joint that dull look.
Electronics Forum | Wed Oct 02 18:18:58 EDT 2002 | davef
The steadfast rule of thumb is: In order to get reliable reflow, you need to be at or higher than [liquidus + 20�C] for about 5 to 10 seconds, rather than those old "60 seconds above 183�C" guideline. This provides for setting your peak based on the
Electronics Forum | Thu Sep 26 14:43:43 EDT 2002 | Jim M.
unsure of what solder spec. your working to?.IPC/EIA J-STD-001C, Section 9.2.4 clearly states dull, matte, gray or grainy appearing solders are accpetable depending on your process and if the acceptability of the neaxt paragraph is met.IPC 610 and J-
Electronics Forum | Wed Oct 02 15:20:55 EDT 2002 | Eric
Is there a steadfast rule of thumb for a good solder joint on an Enig Gold board. I come across this number 217C when discussing BGA profiles. Is this a published number? I sure could use a reference. Anybody feedback is appreciated.
Electronics Forum | Thu Jan 27 11:23:45 EST 2005 | russ
Well first off I wouldn't evaluate paste for a wave process. I would use solder bar instead. Flux - top side fillets and no shorting on the solder side, does it clean well after processing if using water soluble flux. How wide is the process win
Electronics Forum | Wed Nov 29 11:46:57 EST 2006 | slthomas
IPC 610 *C* states that the solder thickness requirement is a properly wetted termination is evident. Fillet height is another aspect and is usually specific to the package but is some function of solder thickness plus a percentage of lead height. D
Electronics Forum | Tue Jul 09 15:20:19 EDT 2002 | pjc
When you look at the capabilities of Combo machines they tend to sacrifice performance when compared to separate X-ray and AOI machines, meaning they don't do either the X-ray or AOI operations as well as a machine that was designed to do only one. A
Electronics Forum | Fri Mar 03 14:40:22 EST 2006 | amol_kane
i think a more important issue here would be the reduction ratio. as LF solders have a higher surface tension, they do not flow as well as their leaded counterparts. therefore the stencil design may have to be changed (hence a new stencil) if the red