Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.

class 3 filet height

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class 3 filet height | 26 October, 2005

We have a class 3 assembly we will be doing soon and I was wandering since the fillet heighth required for class 3 is 50% more than class 2, should I have my stencil thickness increased from 6 mil. to 7 mil.? This assembly is made up of 31 mil. pitch qfp's and chip components and sma diodes.What do ya think?

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Bob R.


class 3 filet height | 27 October, 2005

Nearly all of our assemblies have to meet class 3 requirements and we regularly use 5 and 6 mil stencils. If you've got reasonably well controlled processes you won't have any trouble getting class 3 joints on QFPs and discretes.

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