Electronics Forum: standoff (Page 1 of 27)

QFN standoff, industry standard

Electronics Forum | Thu Mar 28 13:19:14 EDT 2019 | davef

There is no industry standard for BTC stand-off height. "IPC-7093A Design and Assembly Process Implementation for Bottom Termination SMT (BTC) Components" just finished "Final Draft for Industry Review" in December 2018. It mentions stand-off height

Radial Components W/ Standoffs

Electronics Forum | Wed May 06 23:46:31 EDT 1998 | Thomas Nisbet

We want to insert LED's on .100 center's with a UIC Rad 2. The LED must have plastic standoff on the leads before they are inserted. Are there any tape & reel machines that will put the standoff on the LED and then put the component on tape & Reel. A

QFN standoff, industry standard

Electronics Forum | Tue Mar 26 10:30:28 EDT 2019 | pavel_murtishev

Hello, Could you please tell me if there is any industry standard specifying QFN to PCB standoff after soldering? Is any gap allowed? Browsing IPC-A-610, I have found nothing. Any input would be appreciated. Regards

QFN standoff, industry standard

Electronics Forum | Mon Jul 01 04:50:04 EDT 2019 | sssamw

Yes, No standard.Normally QFN supplier suggest 50-75 um (2-3 mil), but it's very hard to achieve and hard to make consistent stand-off in prodution.

QFN standoff, industry standard

Electronics Forum | Thu Mar 28 13:38:35 EDT 2019 | pavel_murtishev

Davef, Thank you for the comprehensive reply. I do really appreciate your help. Regards

QFN standoff, industry standard

Electronics Forum | Wed Jul 03 09:47:39 EDT 2019 | SMTA-Pat

We have seen that vias included in the PCB under the thermal pad will give less voiding.

QFN standoff, industry standard

Electronics Forum | Tue Mar 26 16:36:00 EDT 2019 | charliedci

80% on edge pads and >60% on center pad(s). So with this in mind the component body should stand off a bit.

QFN standoff, industry standard

Electronics Forum | Wed Jul 03 17:23:03 EDT 2019 | davef

Pavel Murtishev: Please click the link under my avatar [to the left of this message] and send me your email address.

Standoff heights for glue syringes

Electronics Forum | Tue Aug 04 11:10:22 EDT 1998 | Chrys

Hi Stoney, Justin is giving you some good advice, unfortunately these kinda' problems sometimes call for the ol' D.O.E...otherwise, you could be chasing your tail for a while until you figure out exactly what's causing your problems. Has

QFN standoff, industry standard

Electronics Forum | Wed Mar 27 04:32:49 EDT 2019 | pavel_murtishev

Charliem, Thank you for the input. Following this logic, in case if there are no soldering issues, pad coverage and voiding levels are within acceptable limits and a gap between BTC and pad let us say 200um, this could be accepted, right? IPC-A-61

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