Electronics Forum: 0402 land patterns (Page 1 of 24)

SMD land patterns design for wave soldering

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

SMD land patterns design for wave soldering

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

PCB land pattern for RC0402 and CC0402

Electronics Forum | Mon Oct 06 02:24:35 EDT 2008 | gang

thank you very much

PCB land pattern for RC0402 and CC0402

Electronics Forum | Wed Sep 24 04:18:12 EDT 2008 | gang

we have some problems in soldering joints such as insufficient solder and misalignment on some RC0402 and CC0402,i don't have a pic here. our SMT enginner doubts the PCB land pattern is at the fault.here is what we measured results.pad length:0.9mm,

PCB land pattern for RC0402 and CC0402

Electronics Forum | Fri Sep 26 12:19:09 EDT 2008 | davef

For the IPC Land Pattern Viewer, look here: http://landpatterns.ipc.org/default.asp

Min spacing for land patterns from PCB edge

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!

Min spacing for land patterns from PCB edge

Electronics Forum | Thu Mar 20 16:53:32 EDT 2008 | guhansub

Min spacing will be 0.75'' on all the 4 edges

Min spacing for land patterns from PCB edge

Electronics Forum | Tue Mar 25 03:28:12 EDT 2008 | lococost

Thanks Steve, that's very clear!

Min spacing for land patterns from PCB edge

Electronics Forum | Wed Mar 19 09:54:44 EDT 2008 | davef

Here's what we suggest: * Keep a 5-mm space between a board edge and a ceramic capacitor. * Mount the capacitor parallel relative to the edge. * Design pads about a half of the termination. * Fixture the board when using your pizza cutter.

Min spacing for land patterns from PCB edge

Electronics Forum | Thu Mar 20 10:59:59 EDT 2008 | fsw

Thnx Dave! I have not seen anyone as yet using fixtures to support brds while using Pizza cutters. Will check it out.

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