you mean something like this? http://www.cree.com/~/media/Files/Cree/LED%20Components%20and%20Modules/XLamp/XLamp%20Application%20Notes/XLamp_PCB_Thermal.pdf filled via vs partially filled do have difference. you might need x-ray inspection... my 1.4 cents. jk > Maybe I should know better than to ask two questions in the same email, > but > they're related... > I got into a discussion about the hole fill requirement for some large > through-hole power devices and connectors. The supplier is worried about > using a "percentage" hole fill measurement, because he says that even if > the hole is 75% full (or whatever percentage we want to use) the hole wall > will not be WETTED 75%. He maintains that the cold solder can extend up > farther than the actual portion that makes a good joint. So he is looking > at the TOP PAD WETTING for verification of a good solder joint, even > though > we don't require it. > > Q1) It seems like an inspection procedure looking for WETTING instead of > HOLE FILL is not what is intended in IPC, but does he have a point? The > hole fill problem is with Selective Soldering, not Reflow > > Q2) Wanting to provide bare board designs using good DFM practices, I > would > be willing to reduce my thermal spoke widths so the solder will flow > better, but I can't find a calculation that would tell me what I need for > something like 10A. There is nothing about this in the IPC-2152 Current > Carrying standard. Is there a rough guideline I can use for current > through > planes using thermal relief?? > > thanks > Jack > > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or [log in to unmask] > ______________________________________________________________________ > ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________