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US 5,449,951 AGranted
Lead frames with improved adhesion to a polymer
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 chromium, zinc or 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.
Claims8
A leadframe, comprising:
- an electrically conductive iron based alloy substrate formed into a plurality of leads, said substrate coated with a dilute sulfuric acid soluble metallic layer having a thickness of from about 10 angstroms to about 1000 angstroms and containing a mixture of chromium and zinc.
A leadframe, comprising:
- an electrically conductive nickel based alloy substrate formed into a plurality of leads, said substrate coated with a dilute sulfuric acid soluble metallic layer having a thickness of from about 10 angstroms to about 1000 angstroms and containing a mixture of chromium and zinc.
Dependencies are inferred from the claim text.