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US 5,343,073 AGranted
Lead frames having a chromium and zinc alloy coating
AssigneeOlin Corporation
InventorsArvind Parthasarathi, Deepak Mahulikar
Life of this patent
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Abstract
There is provided a lead frame with enhanced adhesion to a polymer resin. The lead frame is coated with a thin layer of containing a mixture of chromium and zinc. A mixture of chromium and zinc with the zinc-to-chromium ratio in excess of about 4:1 is most preferred. The coated lead frames exhibit improved adhesion to a polymeric resin.
Claims14
A leadframe comprising:
- an electrically conductive metal substrate being a copper base alloy and formed into a plurality of leads, said substrate coated with at least one metallic layer, the outer most layer containing a mixture of chromium and zinc.
Dependencies are inferred from the claim text.