Patent ID: 9472480
Filing Date: 2016-10-18
CPC Classification: H01L

Claim Text:
1. A transistor package comprising: a lead frame; a wide band-gap semiconductor device attached to the lead frame using a die attach material with a bulk thermal conductivity greater than about 40 W/m-K and less than about 200 W/m-K and a flexural modulus less than about 20 GPa, and an over-mold that is molded at least part way around the lead frame and that substantially surrounds the wide band-gap semiconductor device, the over-mold having a glass transition temperature greater than about 135° C. and a flexural modulus less than about 20 GPa, wherein the over-mold has a thermal coefficient of expansion less than about 50 ppm/° C. at temperatures above the glass transition temperature and a coefficient of thermal expansion less than 18 ppm/° C. at temperatures below the glass transition temperature.