std03n.pdf datasheet:

Darlington Transistor with built-in compensation diodes STD03N March, 2006 Package--- MT-105 (TO3P 5-pin) Features High collector power dissipation: Pc=160W (with TO-3P) Low internal impedance by means of thinner die structure Built-in temperature compensation diode Complementary to STD03P Applications Audio output Equivalent circuit C(3) B(1) K(2) E(5) Absolute maximum ratings (Ta= 25C) Parameter Symbol Rating UnitCollector-Base Voltage VCBO 160 VCollector-Emitter Voltage VCEO 160 VEmitter-Base Voltage VEBO 5 VCollector Current IC 15 ABase Current IB 1 ACollector Power Dissipation PC 160 (Tc= 25C) W Diode Forward Current Di VF 10 mA Junction Temperature Tj 150 CStorage Temperature Tstg -55 to 150 C. Sanken Electric Co.,Ltd. http://www.sanken-ele.co.jp/en/T01-001EA-0603091/8Dar