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Ask the Experts

January 19, 2009 - Updated
January 19, 2009 - Originally Posted

Reflow Solder Process Issue

We have a "solder robbing" issue with our reflow process. We feel it is related to the temperature uniformity of the reflow oven? Are there other conditions that would create this problem?

Q.N.

Expert Panel Responses

Why do you believe it is related to temperature uniformity? Typical drivers for solder robbing is overprinting or slump of the solder paste. Is this under a BGA?

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.

To minimize the occurrences of solder robbing during reflow, the profile should be modified to have a longer low temperature soak time to drive off the lower boiling point volatiles. Additionally, the boards could be reflowed in an inert atmosphere to preventany additional oxidation. The nitrogen level should be between 20 to 200 ppm of oxygen.

Terry Jeglum
President/CEO, Electronic Technology Corporation

Mr. Jeglum has 35+ years experience and is the founder of Electronic Technology Corporation. He is responsible for 22 years of program management for the Company.

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