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Lead frame which has a high thermal conductivity and high mechanical strength is one of core technology for ultra-thin electronics such as LED lead frames, memory devices of semiconductors, smart phone, PDA, tablet PC, notebook PC etc. In this paper, we fabricated a Cu/STS/Cu 3-layered clad metal for lead frame packaging materials and characterized the mechanical properties and thermal conductive properties of the clad metal lead frame material. The clad metal lead frame material has a comparable thermal conductivity to typical copper alloy lead frame materials and has a reinforced mechanical tensile strength by 1.6 times to typical pure copper lead frame materials. The thermal conductivity and mechanical tensile strength of the Cu/STS/Cu clad metal are 284.35 W/m·K and 52.78 kg/mm 2 , respectively. Key Words : Clad metal, Lead frame, LED, Semiconductor 1.   ‘’  LED(light emitting diode)   . LED           1962 GaAsP     GE(general electric) Nick Holonyak Jr.   .   LED, 1995      LED    LED . LED      (  10%), (5),  ,  ()

Study on the Mechanical Properties and Thermal Conductive Properties of Cu/STS/Cu Clad Metal for LED/semiconductor Package Device Lead Frame