Electronics Forum: thermal pad (Page 7 of 49)

QFN PCB Pad no Drain Hole

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

Thermal Pads Soldering Worry, can anybody help?

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.

QFP soldering issue

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

Thermal Relief Pad causes bad solder

Electronics Forum | Thu Aug 18 12:18:44 EDT 2016 | horchak

Yep

Thermal Relief Pad causes bad solder

Electronics Forum | Thu Aug 18 20:10:06 EDT 2016 | souldierann

Hi SweetOldBob, how did you say then?

Void under QFN TI LMZ20502SILT

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

BGA shorting

Electronics Forum | Fri Dec 27 01:26:08 EST 2002 | haran

Currently we are running a BGA with a big thermal pad in the middle of the package and encountered high defect of solder shorts.I would like to check whether anyone has experience this problem and how this can be rectified?.

Best way to ensure max solder load on SOIC w Thermal Pad

Electronics Forum | Tue Nov 09 23:32:11 EST 2010 | bising

Stencils are 5mils thickness, SS material. Printer is Accela.

Best way to ensure max solder load on SOIC w Thermal Pad

Electronics Forum | Fri Nov 12 13:41:02 EST 2010 | scottp

I wouldn't count on solder bridging that kind of gap. I've never used solder preforms, but I wonder if that would be worthwhile to try?

LGA... where to start?

Electronics Forum | Fri May 09 09:31:04 EDT 2014 | jorge_quijano

we are placing small QFNs with no major issues, but this one may not seem like a QFN with thermal pad... I'm attaching a picture of the component.


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