Electronics Forum | Thu Nov 02 17:15:34 EST 2000 | Erdem Bilaloglu
We are using semi-circular land pattern and 0.004" smaller appertures on screen. With stable rising slope (max:2.6degC/sec)we have not experienced any tombstonning so far.
Electronics Forum | Wed Oct 31 11:01:02 EST 2001 | dougie
Hi Dave, Thanks for the suggestions. To clarify a couple of the points... - What do you qualify as "small" & "large" parts? - Do not make the pad narrower than the lead width. The nominal or the maximum? If I use the maximum width I'll be back to s
Electronics Forum | Thu Nov 01 17:32:13 EST 2001 | davef
"small" versus "LARGE" parts? Jeez, what do I know? We don�t have a formal definition. They�re the ones that make you say: �Now, that�s a BIG-ass part!!!� �nominal� versus �maximum�? Yes, yer correct.
Electronics Forum | Fri Nov 16 10:22:51 EST 2001 | Steve
Try IPC-SM-782A,Surface Mount Design and Land Pattern Standard. Go to http://www.ipc.org
Electronics Forum | Fri Dec 14 08:31:51 EST 2001 | PeteC
For a reference check out IPC-SM-782A Amendment 2 "Surface Mount Design and Land Pattern Standard" BGA. It can be found at http://www.ipc.org
Electronics Forum | Mon Apr 29 00:15:30 EDT 2002 | GregH
If IPC-SM-782 is for Surface Mount Land Pattern, what is the Standard used for Through Hole Guide (eg. Component Lead Thickness versus Hole diameter etc.), where can I find them? thanks
Electronics Forum | Tue May 04 13:11:17 EDT 2004 | Rob
Does any one can send me land pattern recommendation for package TSOP44 type II please. Rob
Electronics Forum | Fri Jan 14 12:59:07 EST 2005 | Dan Mendoza
I have used the rectangle shapes and round shapes with no noticible difference. The idea is to design the pads to accept the same solder volume per component. Components over two size pads will favor the higher solder volume side during reflow.
Electronics Forum | Fri Jan 14 14:59:52 EST 2005 | russ
We use a 25 x 25 mil square pad with a 18-20mil GAP with great success. Russ
Electronics Forum | Mon Jan 17 12:23:47 EST 2005 | Dan Gosselin
Thanks for your input. What would you say is the biggest defect condition you see with 0402's? ANy difference with 0402 caps vs. resistors? Dan
