Transistor BD142 NPN, 45V, 15A, TO-3

Power Transistor BD142 NPN, 15A TO-3

Transistors

Reference: TRBD142

Part.No: BD142

€1.90

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The BD142 is a NPN Bipolar Junction Transistor (BJT) in a rugged TO-3 metal package, rated for up to 15A and 45V. Designed for high-current switching and power amplification in motor drivers, power supplies and audio output stages.

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Description
Product Details

BD142 Power Transistor - High-Current NPN Switching in TO-3

The BD142 is a power NPN BJT housed in a TO-3 metal case, built to handle demanding switching and amplification tasks where high current and voltage headroom are required. Its rugged package and 15A rating make it a solid choice for motor control, power regulation and audio power stages that need reliable heat dissipation.

Functions & Applications

High Current Handling: Rated for up to 15A, suitable for motors, solenoids and high-power loads.
45V Collector-Emitter Rating: Provides voltage headroom for power supply and industrial control circuits.
Rugged TO-3 Metal Package: Excellent heat spreading and easy mounting to heatsinks for sustained high-power operation.
Power Amplification: Well suited to audio power stages and other linear amplification duties requiring high output current.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-3
Collector-Emitter Voltage (Vceo)	45V
Max Collector Current (Ic)	15A
Mounting Type	Through-Hole, Bolt-Down (TO-3)

Frequently Asked Questions

Q: Does the BD142 require a heatsink?
A: Yes. Given its 15A rating and TO-3 metal case, a properly sized heatsink is necessary to keep junction temperature safe under sustained load.

Q: Is the BD142 suitable for driving DC motors or relays?
A: Yes, its high collector current rating of 15A makes it well suited for switching motors, solenoids and other inductive loads, provided a flyback diode is used.

Notes

This is a high-power part in a TO-3 metal case - always mount it on an adequate heatsink for continuous high-current operation.

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-3

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