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 Post subject: QFNs and Leadless?
PostPosted: Tue Feb 26, 2019 4:03 am 

Joined: Tue Feb 26, 2019 2:43 am
Posts: 4
Are QFNs and DFNs considered ICs to boardsort's standard?


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 Post subject: Re: QFNs and Leadless?
PostPosted: Tue Feb 26, 2019 4:05 pm 
Site Admin

Joined: Tue Feb 03, 2015 6:57 pm
Posts: 5141
Location: Low DOS
Modern chips
as long as it doesn’t have a full fledged spreader yes, IC rate
With a heavy tungsten spreader it goes pinless
—>
If it’s an old ceramic chip like the i286/80286, Motorola, MOS etc
For gold connectors post a picture
Everything else goes as IC

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 Post subject: Re: QFNs and Leadless?
PostPosted: Wed Feb 27, 2019 12:06 pm 

Joined: Tue Feb 26, 2019 2:43 am
Posts: 4
Thanks for the reply! Kinda confused on what you mean by spreader tho? As in a center pad(ground pad)?... Would you mind clarifying if these would be sellable. Obviously after accumulating much more thanks


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 Post subject: Re: QFNs and Leadless?
PostPosted: Wed Feb 27, 2019 12:12 pm 

Joined: Tue Feb 26, 2019 2:43 am
Posts: 4
Might be hard to see but #4 is dfn that has gold pads. Not sure if this would be a different category of ics.


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File comment: #2 these I'm pretty sure are the basic standard? All Soics and and QFPs
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 Post subject: Re: QFNs and Leadless?
PostPosted: Wed Feb 27, 2019 3:37 pm 
Site Admin

Joined: Tue Feb 03, 2015 6:57 pm
Posts: 5141
Location: Low DOS
Everything except 4 is standard IC chips.
#4 would be at Chris’s discretion as to where it would go: you can email him the photo.

By spreader I’m referring to a piece of metal, usually tungsten or tungsten plated copper,
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About 1/8-1/16th of an inch thick that weighs more than the IC it’s attached to.

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-- my grades are my own and do not represent an offer from boardsort, nor are they guaranteed. Please keep that in mind.


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 Post subject: Re: QFNs and Leadless?
PostPosted: Thu Feb 28, 2019 1:01 am 

Joined: Tue Feb 26, 2019 2:43 am
Posts: 4
Awesome! Much appreciated, ill keep qfns with gold contacts separate from now on.

And oh okay! I recognize those, so spreaders are the metal plate typically on larger BGAs and such?


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 Post subject: Re: QFNs and Leadless?
PostPosted: Thu Feb 28, 2019 5:26 am 
Site Admin

Joined: Tue Feb 03, 2015 6:57 pm
Posts: 5141
Location: Low DOS
Typically yes. But on ultra condensed boards, eg embedded systems, they can be found on the tiniest of ICs.
I stole Chris’s photo for the example since I come across the micro minis so rarely I never thought to photo one.

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-- my grades are my own and do not represent an offer from boardsort, nor are they guaranteed. Please keep that in mind.


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