Patent ID: 6194777
Filing Date: 2001-02-27
Classification: H01L,H05K

Abstract:
A leadframe having a die paddle and plurality of leads; wherein said leads have a portion which is to be internal to a plastic package encapsulating a semiconductor device, and a portion of the leads to be external to the encapsulation, said lead frame comprising:a) a copper base material,b) a flash layer of nickel conveying said base material;c) a thin layer of palladium/nickel covering said flash layer;d) a thick layer of nickel covering said thin layer;e) a one microinch coating comprising palladium covering said thick layer on the internal leads and die paddle, andf) a three microinch coating comprising palladium covering said thick layer on the external leads which are designed to be solder contacted during assembly to the next level on intercomnection.