Power Transistor BD945 NPN, 10A TO-220

Power Transistor BD945 NPN, 10A TO-220

Transistors

Reference: TRBD945

Part.No: BD945

€1.40

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The BD945 is a high-performance NPN Power BJT in a TO-220 package. Designed for moderate to high current switching and amplification, it is ideal for audio amplifiers, PWM motor control, and general-purpose power applications in industrial and DIY electronics.

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Description
Product Details

BD945 Power Transistor – High-Current NPN for Audio & Motor Control

The BD945 is a robust NPN power transistor widely used in audio amplifiers and DC motor control circuits. With its solid Safe Operating Area (SOA) and moderate current capability, it provides reliability and ease of integration in both amplification stages and PWM switching applications.

Functions & Applications

High Current Capability: Handles up to ~10A collector current, suitable for driving speakers, relays, and small motors.
TO-220 Thermal Design: Standard power package with mounting lug, enables effective heat dissipation via heatsink.
Robust Safe Operating Area (SOA): Provides stability across a wide range of voltage and current combinations.
Audio & Industrial Ready: Proven in amplifier output stages, motor control, and general-purpose switching applications.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-220
Collector-Emitter Voltage (Vceo)	60V
Max Collector Current (Ic)	10A
Power Dissipation (Pd)	65W
Mounting Type	Through-Hole (THT) with heatsink mount

Frequently Asked Questions

Q: Can the BD945 replace the TIP31 or TIP32 series?
A: Partially. The BD945 has similar voltage ratings (60V Vceo) and current capability (~10A), but always verify your circuit's specific Ic and Vceo requirements before substituting. Check the complementary PNP variant (BD946) for push-pull stages.

Q: Do I need a heatsink for the BD945?
A: It depends on your power dissipation. For continuous operation above ~5W, a heatsink is recommended. The TO-220 case is designed for easy mounting to standard heatsinks via the through-hole fastener.

Note: Price refers to one (1) piece. The component is shipped in bulk without individual packaging.

Transistor Type: BJT (Bipolar Junction Transistor)
Transistor Polarity / Channel: NPN
Transistor Case Style: TO-220

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