Electronics Forum | Thu Feb 24 11:05:53 EST 2000 | Russ
I usuallly like to have the pad size the same size as the ball up to +2mil, the pcb solder mask opening to be +4 mil from the pad size (I have found this to aid in Xray inspection for opens since you can see the little tail of the solder wicking up t
Electronics Forum | Wed Oct 01 13:39:13 EDT 2003 | arturoflores
They take the solder in a dip and look solderability test but when in normal reflow process we got some pins that do not get wet and the appearance is as follows: -Pillow effect on the toe(no front fillet is formed) -There is a sheet of flux between
Electronics Forum | Thu Jun 16 18:19:05 EDT 2005 | Jason Fullerton
If the uBGA has aperatures that are 0.25mm square, you need to use a laser cut foil no thicker than 3.75 mils to get an area ratio of 0.67, which is the minimum rule of thumb - that's too thin! Electroform would probably work up to 4.5 mils thick.
Electronics Forum | Fri Sep 30 19:14:35 EDT 2005 | DasonC
The stencil is 5 mil thick and the aperture is 12 mil sq. We found open but can't detect by x-ray. The process which we are using is no clean TIN/LEAD. Just thinking the ball size variance from 0.35~0.45mm per IPC-7095, in worst case scenarios, th
Electronics Forum | Sun Apr 25 18:25:10 EDT 1999 | Steve Gregory
Hey Guys! Look what I get to try and do this week! I got handed a cardboard box on Friday afternoon with the parts and 20 of these little jewels! That's both sides of the board by the way... Whoever laid this out, I'd like to go and do a "Back to t
Electronics Forum | Sun Apr 25 20:24:03 EDT 1999 | Bubba
| Hey Guys! | | Look what I get to try and do this week! I got handed a cardboard box on Friday afternoon with the parts and 20 of these little jewels! That's both sides of the board by the way... | | Whoever laid this out, I'd like to go and do a
Electronics Forum | Mon Apr 26 11:37:48 EDT 1999 | Chrys Shea
| | Hey Guys! | | | | Look what I get to try and do this week! I got handed a cardboard box on Friday afternoon with the parts and 20 of these little jewels! That's both sides of the board by the way... | | | | Whoever laid this out, I'd like to go
Electronics Forum | Mon Apr 26 16:24:35 EDT 1999 | JohnW
| | | Hey Guys! | | | | | | Look what I get to try and do this week! I got handed a cardboard box on Friday afternoon with the parts and 20 of these little jewels! That's both sides of the board by the way... | | | | | | Whoever laid this out, I'd
Electronics Forum | Mon Apr 26 22:40:27 EDT 1999 | Dean
| | | | Hey Guys! | | | | | | | | Look what I get to try and do this week! I got handed a cardboard box on Friday afternoon with the parts and 20 of these little jewels! That's both sides of the board by the way... | | | | | | | | Whoever laid this
Electronics Forum | Thu Jun 29 09:29:46 EDT 2000 | JAX
sree, You might want to check the archives. If not, I found this just a few questions below yours!! [Back to thread listing at top] Posted by Igmar on June 22, 2000 at 10:27:26 AM EST Can someone please help with the aperture size on a Micro BGA st
