2N3440 NPN Bipolar Low Power Transistor 250V 1A TO-39 Metal Package

2N3440 NPN Bipolar Low Power Transistor 250V 1A TO-39 Metal Package

The 2N3440 is a high-voltage, low-power NPN bipolar junction transistor (BJT) designed for switching and small-signal amplification in applications requiring high voltage tolerance with moderate current. It features a collector-emitter voltage of 250V and a collector current of 1A, making it ideal for analog circuits, voltage regulation, and control systems.

Encased in a TO-39 metal package, the transistor provides excellent thermal dissipation, mechanical strength, and long-term reliability. Its low leakage current, stable gain, and efficient switching performance make it suitable for industrial, educational, and hobby electronics, as well as replacement in legacy high-voltage designs.

The 2N3440 is often used in high-voltage amplifiers, driver stages, and signal processing circuits, where high voltage handling, durability, and stability are critical. Its robust metal casing allows it to safely handle high-voltage transients, ensuring consistent operation under demanding conditions.

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Features

• NPN Bipolar Junction Transistor (BJT) – high-voltage, low-power operation
• Collector-Emitter Voltage (Vce): 250V
• Collector Current (Ic): 1A
• Collector-Base Voltage (Vcb): 250V
• Emitter-Base Voltage (Veb): 5V
• Power Dissipation (Ptot): 20W
• DC Current Gain (hFE): 20–70
• Transition Frequency (fT): 20 MHz (typical)
• TO-39 Metal Package: Durable, thermally efficient
• Low Leakage Current: Efficient and reliable operation
• Rugged Construction: Handles high-voltage operation reliably
• RoHS Compliant

Applications

• High-voltage switching circuits
• Linear and small-signal amplification
• Driver stages for medium/high-voltage power transistors
• Voltage regulators and power supply circuits
• Relay and solenoid drivers in industrial applications
• Audio and RF amplification requiring high-voltage operation
• Educational and laboratory electronics projects
• Replacement for legacy high-voltage transistor designs

2n3440-transistor-datasheet