View bt152b datasheet:

Philips Semiconductors Product specification Thyristors BT152B series GENERAL DESCRIPTION QUICK REFERENCE DATA Glass passivated thyristors in a plastic SYMBOL PARAMETER MAX. MAX. MAX. UNIT envelope suitable for surface mounting, intended for use in BT152B- 400R 600R 800R applications requiring high VDRM, Repetitive peak off-state 450 650 800 V bidirectional blocking voltage VRRM voltages capability and high thermal cycling IT(AV) Average on-state current 13 13 13 A performance. Typical applications IT(RMS) RMS on-state current 20 20 20 A include motor control, industrial and ITSM Non-repetitive peak on-state 200 200 200 A domestic lighting, heating and static current switching. PINNING - SOT404 PIN CONFIGURATION SYMBOL PIN DESCRIPTION mb 1 cathode ak 2 anode 3 gate 2