TO-72

TO-92

TO-82

TO-102

AC supply function

Forward biased

Reverse biased

Dual supply function

Practically very low

Practically zero

Practically unity

Practically infinity

AC supply connected to drain termin

Main current flows through N-doped material

Main current flows through P-doped material

S-terminal connected to positive

UJT

FET

BJT

IGBT