Wireless transistor outline package structure

Abstract

A wireless transistor outline (TO) package structure includes a carrying module, a chip and a lead frame both mounted on the carrying module, a sheet-like bonding module mounted on the chip and the lead frame in a flip chip manner, and an encapsulant that covers the above components therein. A connection pad of the chip and a connection segment of the lead frame are coplanar with each other. The sheet-like bonding module includes a ceramic substrate and a plurality of circuit layers that are stacked and formed on the ceramic substrate in a direct plated copper (DPC) manner. Areas of the circuit layers gradually decrease in a direction away from the ceramic substrate, and thicknesses of the circuit layers gradually increase in the same direction. The circuit layer arranged away from the ceramic substrate connects the connection pad and the connection segment for establishing an electrical connection therebetween.