Power Transistor BD437 NPN, 8A TO-126

Power Transistor BD437 NPN, 8A TO-126

Transistors

Reference: TRBD437

Part.No: BD437

€1.20

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The BD437 is a high-current NPN Power Transistor in a TO-126 package. With a maximum collector-emitter voltage of 45V and collector current up to 8A, it is ideal for medium-power amplification stages and output drivers in audio and switching applications.

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Description
Product Details

BD437 NPN Power Transistor – Medium-Power Amplification & Output Stage Driver

The BD437 is a robust NPN power transistor designed for medium-power applications. With its 45V maximum collector-emitter voltage and 8A collector current capability, it excels in audio amplifier output stages, relay drivers, and DC motor control circuits. The TO-126 package provides excellent heat dissipation for sustained operation.

Functions & Applications

High Voltage Rating: Vceo up to 45V allows operation in higher-voltage circuits without reliability concerns.
Substantial Collector Current: 8A continuous current capability drives substantial loads, including speakers and motor windings.
TO-126 Package: Metal tab for secure heatsinking; through-hole mounting for easy integration into PCBs.
Complementary Pair Available: Works seamlessly with the BD438 PNP transistor for push-pull output stages.
Audio & Power Applications: Purpose-built for Hi-Fi amplifier output stages and medium-power switching circuits.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-126
Collector-Emitter Voltage (Vceo)	45V
Max Collector Current (Ic)	8A
Power Dissipation (Pd)	12.5W
Mounting Type	Through-Hole (THT) with Metal Tab

Frequently Asked Questions

Q: Is a heatsink necessary for the BD437?
A: If continuous collector current exceeds 500mA, a small heatsink is highly recommended to maintain safe junction temperature and ensure reliability over time.

Q: What is the complementary PNP pair for BD437?
A: The BD438 is the complementary PNP transistor, designed to work harmoniously with the BD437 in push-pull output stages and balanced amplifier configurations.

Notes

Requires heatsink for sustained currents above 500mA. Use flyback diode when driving inductive loads (relays, motors).

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-126

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