Non p diodes anti an n-channel depletion mode IGFET have been made on InSb using a proton bombardment technique. Extending the technique one step further has made it possible to fabricate a lateral npn transistor on 

 cm
-3germanium doped InSb. Small signal betas of 

 have been obtained at collector currents of approximately 200 microamperes and a collector emitter voltage of about 0.2 volt. The base region is optically active. By increasing the base drive, the optical response can be increased by about a factor of three over the open base case before noise becomes significant.