Electronics Forum: aqfn (Page 1 of 2)

Nordic aQFN73 stencil design

Electronics Forum | Wed Apr 11 09:04:06 EDT 2018 | emeto

Try one aperture 60x60mil

Nordic aQFN73 stencil design

Electronics Forum | Tue Apr 17 08:57:05 EDT 2018 | dleeper

Thanks for the update! I guess whoever designed the package knew what they were doing.

Nordic aQFN73 stencil design

Electronics Forum | Tue Apr 17 16:34:25 EDT 2018 | slthomas

I attributed it to luck, but whatever keeps you up and running!

Nordic aQFN73 stencil design

Electronics Forum | Tue Apr 10 10:21:06 EDT 2018 | slthomas

Dave, that's a cool idea and sounds like something that would actually work. I'd be tempted to go with oversized pads to increase the holding force. Unfortunately as an EMS we would have to work that through the customer approval system and as usual

Nordic aQFN73 stencil design

Electronics Forum | Tue Apr 10 10:33:08 EDT 2018 | davef

Oh, I just remembered the other thing that I wanted to mention ... Do the pads match the component leads?

Nordic aQFN73 stencil design

Electronics Forum | Wed Apr 11 11:55:54 EDT 2018 | slthomas

Yes - every dimension that I measured on the gerbers checks out against datasheet. Presumably the parts match it as well....?

Nordic aQFN73 stencil design

Electronics Forum | Mon Apr 16 16:24:20 EDT 2018 | slthomas

Amazingly enough, every one of these held fast where we placed them with a paste brick sized 1:1 with the thermal pad, no sectioning. Yes, there were voids, but we can live with that in this application.

Nordic aQFN73 stencil design

Electronics Forum | Wed Apr 18 14:17:48 EDT 2018 | esoderberg

Further divide the ground block into more than 4 panes. Also think about using, assuming you have good placement of using Loctite chip bonder on two opposing corners. Lots of ways to get good results

Nordic aQFN73 stencil design

Electronics Forum | Mon Apr 09 16:00:46 EDT 2018 | slthomas

Yes. I'm at a loss as to how to best approach this. I think the giant blob of solder is just going to behave more like a lubricant than anything else. The thing is, I would like to at least try the manufacturer's recommendation once (and this bui

Nordic aQFN73 stencil design

Electronics Forum | Tue Apr 10 08:37:36 EDT 2018 | davef

Hi Steve ... I found nothing in the manufacturers "paper" to help. Comments are: * I agree. No blobs. Solder on the thermal pad should me minimized. Too much solder will float the component. Old timers used to talk about 50-80% coverage. * If you'

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