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July 28, 2010

Soldermask Insulation Issue

We have an unusual component situation. A long lead on an SMT component is overhanging the pad.

Can solder mask in this area provide an acceptable level of insulation between the overhanging component lead and a circuit conductor running below?

F. A.

Experts Comments

No. Solder masks are not designed as dielectric insulators.

Dr. Craig D. Hillman
CEO & Managing Partner
DfR Solutions
Dr. Hillman's specialties include best practices in Design for Reliability, strategies for transitioning to Pb-free, supplier qualification, passive component technology and printed board failure mechanisms.
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