BDX53B,BDX53C --> NPN
BDX54B,BDX54C --> PNP

DARLINGTON 8 AMPERE COMPLEMENTARY SILICON POWER TRANSISTORS 80–100 VOLTS 65 WATTS

. . . designed for general–purpose amplifier and low–speed switching applications.
• High DC Current Gain —hFE = 2500 (Typ) @ IC = 4.0 Adc
• Collector Emitter Sustaining Voltage — @ 100 mAdc
VCEO(sus) = 80 Vdc (Min) — BDX53B, 54B
VCEO(sus) = 100 Vdc (Min) — BDX53C, 54C
• Low Collector–Emitter Saturation Voltage —
VCE(sat) = 2.0 Vdc (Max) @ IC = 3.0 Adc
VCE(sat) = 4.0 Vdc (Max) @ IC = 5.0 Adc
• Monolithic Construction with Built–In Base–Emitter Shunt Resistors
• TO–220AB Compact Package