Electronics Forum | Sat Dec 02 10:23:47 EST 2017 | tomh
Have you ever heard of "Solder Mask Defined Thermal Pads"? I wrote a short blurb on this here - https://www.pcblibraries.com/forum/ipc7093a-btc-qfn-solder-mask-defined-thermal-pad_topic2154.html This technology saves fabrication costs by not havi
Electronics Forum | Fri Jan 18 14:39:07 EST 2013 | davef
Main issues with LGA voiding are: * Design * Material selection * Thermal recipe For design, loo here http://blogs.smtnet.com/smt/other/qfn-btc-design-guidelines-thermal-pads-etc/ BR, davef
Electronics Forum | Fri Oct 16 14:11:16 EDT 2009 | davef
thermal and pad
Electronics Forum | Mon Dec 06 10:32:35 EST 2021 | jineshjpr
Hi Everyone, Can you please suggest how to achieve 100% solder coverage of two Thermal pads on BRD1260C component..??? Surface finish is OSP Copper & Solder Paste is Sn/Pb 63/37. Component is Gullwing leads type. PCB having 1.60 mm Thickness.Peak Tem
Electronics Forum | Fri May 17 14:56:21 EDT 2013 | davef
There's not supposed to be any effin 'drain hole.' Where's you get that from? Read this: http://blogs.smtnet.com/smt/other/qfn-btc-design-guidelines-thermal-pads-etc/ BR davef
Electronics Forum | Mon Jul 24 09:29:14 EDT 2017 | emeto
Precisely! Your reflow profile is what proves temperature on the pad is right. X-ray is your visual representation of the result - customers love to see that you are correct.
Electronics Forum | Tue Jan 13 22:43:11 EST 2004 | davef
We have seen this in reflowed parts, where there is flux res collected in the dimple in the solder, where the lead 'presses' in the solder. Generally, we attack this as a thermal issue: * Thermal pads sucking the heat away from the leads. * Leads no
Electronics Forum | Thu Aug 18 20:10:06 EDT 2016 | souldierann
Hi SweetOldBob, how did you say then?
Electronics Forum | Fri Jul 27 09:47:20 EDT 2018 | davef
Adding to Rob's suggestions ... One of the theories about voiding in thermal / ground pads of BTC is: Solder starts melting at the edge of the pad and moves inward towards the center of the solder mass. This traps flux volatilizes. So, there needs t
