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Ask the Experts

July 28, 2010 - Updated
July 26, 2010 - Originally Posted

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.

Expert Panel Responses

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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