Darlington Transistor BDX33C 100V 10A NPN

The Darlington Transistor BDX33C is an NPN Darlington power transistor rated for 100 V and 10 A, in a TO-220 package. Two transistors in one package give a DC current gain of at least 750, so a small base current from a microcontroller or driver stage can switch heavy loads such as DC motors, solenoids, lamps and relays.

Darlington Transistor BDX33C Specifications

• Type: NPN Darlington
• Collector-emitter voltage (VCEO): 100 V
• Collector current: 10 A continuous
• DC current gain (hFE): 750 minimum
• Power dissipation: 70 W with the case at 25 °C (heatsink needed)
• Built-in parts: collector-emitter protection diode and base-emitter resistors
• Package and pinout: TO-220, pins base, collector, emitter (B-C-E); the tab is the collector
• PNP complement: BDX34C

Darlington Transistor BDX33C Applications

• Driving DC motors and pumps from Arduino or ESP32 outputs
• Switching solenoids, relays and lamps
• Pass transistors in linear power supplies
• Audio amplifier output stages with the BDX34C

What's in the Box

• 1 × BDX33C NPN Darlington transistor

Tip: Use a base resistor of about 1 kΩ from the microcontroller pin, connect the load between the supply and the collector, and connect the emitter to ground. A Darlington drops around 2 V when fully on, so it heats up at high currents: fit a heatsink, and add a flyback diode across motors and coils.

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