LEAD FRAME THAT HAS EXCELLENT ADHESION PROPERTY

摘要

PROBLEM TO BE SOLVED: To provide a metal lead frame of reinforced adhesiveness with a polymer resin. SOLUTION: A metal layer 20 on the outermost side contains a mixture of chromium and zinc having a zinc-to-chromium ratio of about 4:1 or greater and having chromium of zinc characteristic deposited thereto. The metal layer 20 on the outermost side is adhered to a polymer resin. An inner conductor 16 of a conductive metal substrate 14 is sealed in a molded plastic package 10. The conductive metal substrate 14 is made of a copper-based alloy.