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 | Thu Nov 01 13:08:33 EST 2001 | dave231
I am just starting to get into sub 50mil pitch, but from what I can see you are correct. But I can help with solder stencil. I cut the width only half of what the pad is, but the keep the length the same. This has helped but does not fix always. Stil
Electronics Forum | Tue Oct 30 19:42:44 EST 2001 | davef
Jim Blankenhorn [www.smtplus.com] has the best understanding of designing pads for real life. That�s because he designs them like he wants to design them and doesn�t negotiate with a committee of thousands for an IPC standard. Consider doing this
Electronics Forum | Tue Oct 30 08:48:01 EST 2001 | dougie
Hi, Our PCB designers are beginning to send up designs to manufacturing that have increasingly difficult footprints to work with. The footprints have been generated by the IPC-SM-782 calculator but just look wrong to me. The pitch of the devices in
Electronics Forum | Wed Jul 03 14:08:10 EDT 2002 | gbriceno
I' designing a PCB with SMD components to optimize the land patterns for wave soldering. I find that the IPC-SM-782 land patterns are not robust enough for wave soldering, yielding ramdom skips and bridges. This PCB will also give me insight on sha
Electronics Forum | Wed Jul 03 15:58:16 EDT 2002 | davef
Your thinking is correct. Wave soldering pads that were designed for reflow can create problems: * Large pads used for reflow [too much solder] can create reliability problems. * Bridging [too much solder] creates rework. * Skipping & shadowing from
Electronics Forum | Tue Mar 18 12:38:39 EDT 2008 | fsw
Hi! Can anyone tell me what is the min spacing between PCB edge & land pattern to avoid cracking of components due to mechanical stresses caused while depaneling with cookie/pizza cutter. Thnx!
Electronics Forum | Thu Mar 20 16:53:32 EDT 2008 | guhansub
Min spacing will be 0.75'' on all the 4 edges
Electronics Forum | Tue Mar 25 03:28:12 EDT 2008 | lococost
Thanks Steve, that's very clear!
Electronics Forum | Thu Nov 11 11:38:39 EST 1999 | John Thorup
Try the Professional SMT Component and Land Pattern Book from SMT Plus. Link below. John Thorup
