QFN-16 Package standards

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genifycom
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Joined: Sat Dec 10, 2016 9:40 am

QFN-16 Package standards

Post by genifycom » Sat Dec 10, 2016 9:59 am

Forgive my ignorance please. If I look at QFN-16 ICs, there are (at a minimum) two different pin layouts. A 4 pins per side arrangement and a 2x5 and 2x3 pin arrangement.

What is the industry standard to distinguish between these two?

I ask because parts.io lists my IC as "Package Description VQCCN, LCC16,.12SQ,20". NXP lists it as Case 2094-01. Searches seem to show that these are manufacturer or distributor specific.

When looking for an adapter, they all just list QFN-16 (3 x 3 mm body, 0.5 mm pin pitch) which could be either pin arrangement.

Thank you for any guidance.

FredC
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Joined: Fri Jan 13, 2017 8:05 am
Location: Tampa, Florida

Re: QFN-16 Package standards

Post by FredC » Thu Jan 19, 2017 6:55 am

QFNs are usually complicated because their connections are usually at the bottom of the chip.

n1ist
Support Volunteer
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Joined: Wed Mar 22, 2006 11:02 am

Re: QFN-16 Package standards

Post by n1ist » Thu Jan 19, 2017 8:39 pm

I have only seen the 4x4 arrangement. I'd guess a 3x3mm body would be for the 4x4 pad version and the other version would be a rectangular package.
/mike

mattylad
Posts: 230
Joined: Sat Sep 25, 2010 3:49 pm

Re: QFN-16 Package standards

Post by mattylad » Sat Jan 21, 2017 2:10 am

Unfortunately the manufacturers rarely standardize.

Take SOT23 for instance, there are about 50+ variations on it.

Take your parts datasheet, enter the component dimensions into the PCB libraries Library Expert and produce a footprint for your CAD package. The free version should enable you to do this quickly and easily.

FredC
Posts: 14
Joined: Fri Jan 13, 2017 8:05 am
Location: Tampa, Florida

Re: QFN-16 Package standards

Post by FredC » Mon Jan 23, 2017 9:10 am

mattylad wrote:Unfortunately the manufacturers rarely standardize.

Take SOT23 for instance, there are about 50+ variations on it.

Take your parts datasheet, enter the component dimensions into the PCB libraries Library Expert and produce a footprint for your CAD package. The free version should enable you to do this quickly and easily.
Good idea. A free version will simplify the process for you. But in the datasheet some revisions may differ depending on the current version.

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