How to bond heavy component to PCB

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February 10, 2012

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March 9, 2009

How to bond heavy component to PCB

Can you recommend epoxy to bond a surface mount transformer, 7.5 grams, to a PCB?

The board needs to pass 20G vibration and 40G shock tests.

What steps do you recommend and in what order should they occur - solder paste, then epoxy, then pick and place, then reflow?

Also, how would this process be specified on a drawing, 65% coverage under part, or by volume? Should epoxy pattern under part be dot, striped pattern or solid mass?

C. B.

Experts Comments

I'm sorry we work with many vendors and cannot recommend a formulation or a particular vendor. However I would suggest you contact several vendors and ask to see if they have any test data that would suggest one of their materials meets your requirements.

Steven Adamson
Market Specialist
Nordson ASYMTEK
Market Specialist for Nordson ASYMTEK. Mr. Adamson worked for Kodak, Motorola and Plessey, ICL in the UK with 5 US and 2 UK patents. He was awarded a HNC in electrical engineering and was 2008 President of IMAPS. Mr. Adamson was a respected mentor in the electronics industry. He passed away October, 2011. Learn about the Steve Adamson Memorial Annual Scholarship Fund.

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