The BT151 is a medium power 12A silicon-controlled rectifier that comes in a TO-220 package that can be used to switch medium power AC/DC loads and can handle high DC pulses.
Pin configuration
Pin number:
Pin name:
Pin description:
1
Cathode
Conventional current flows out of the cathode.
2
Anode
Conventional current flows into the anode.
3
Gate
Controls conduction between the anode and cathode.