关键词: 微波管, 壳温, 电老炼, 导热硅胶

Abstract: In the paper，functions of each part of the anti-self-oscillation aging circuit for 35 micro-x packaged microwave transistors are introduced in detail.And the method of determining whether the transistor is in stable state or not is discussed.In order to simulate the actual aging state，an aging circuit is built in the test room.In this way，the values of case temperature under different cooling conditions are compared，and the temperature difference between the top and the bottom of the case is figured out by infrared thermal imager. Results show that the junction temperature is controlled by using aluminum block and thermally conductive silica gel during the aging process of 35 micro-x package.

Key words: microwave transistor, case temperature, electrical aging, thermally conductive silica gel