Letter 24125

Corrosion Issue on Pure Copper Lead frame  

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I am investigating "pure copper lead frame" as potential substitute for preplated copper lead frame in transistors. Does this not pose a risk of corrosion considering Aluminum wire will be bonded to it?

Aniceto V. Idjao Jr.
semiconductors - Quezon City, Metro Manila, Philippines

Hi, Aniceto. Galvanic corrosion is a phenomenon that occurs on exposed surfaces. As such, if the environment was sufficiently benign that there was no objectionable galvanic corrosion with copper plated pins, I think there will be none with solid copper pins. Good luck.

Regards,

Ted Mooney, P.E.  finishing.com Brick, New Jersey