Germanium material used

Silicon material used

Antimony material used

Indium material used

Energy

Current

Voltage

Frequency

Complex design

Higher thermal stability

Requires complicated bias arrangement

Silicon transistor needs low cut-involtage

NPN has lower switching speed

NPN has good bias stability

NPN has higher switching speed

Low operating voltage

Low power transistors

Medium power transistors

High power transistors

Epitaxial versa watt transistors