diffused mesa transistor

diffused mesa transistor

[də¦fyüzd ¦mā·sə tran′zis·tər]
(electronics)
A diffused-junction transistor in which an n-type impurity is diffused into one side of a p-type wafer; a second pn junction, required for the emitter, is produced by alloying or diffusing a p-type impurity into the newly formed n-type surface; after contacts have been applied, undesired diffused areas are etched away to create a flat-topped peak called a mesa.