LEAD FRAME SURFACE FINISHING

The present disclosure is directed to a lead frame design that includes a copper alloy base material coated with an electroplated copper layer, a precious metal, and an adhesion promotion compound. The layers compensate for scratches or surface irregularities in the base material while promoting adhesion from the lead frame to the conductive connectors, and to the encapsulant by coupling them to different layers of a multilayer coating on the lead frame. The first layer of the multilayer coating is a soft electroplated copper to smooth the surface of the base material. The second layer of the multilayer coating is a thin precious metal to facilitate a mechanical coupling between leads of the lead frame and conductive connectors. The third layer of the multilayer coating is the adhesion promotion compound for facilitating a mechanical coupling to an encapsulant around the lead frame. 本公开涉及引线框架设计，其包括涂覆有电镀铜层、贵金属以及粘合促进化合物的铜合金基材。这些层补偿在基材中的划痕或者表面不平整，同时促进从引线框架到导电连接件的粘合，并且通过将它们耦合到引线框架上的多层涂层的不同层来促进从引线框架到包封剂的粘合。多层涂层的第一