Power Transistor BD433 NPN, 4A TO-126

Power Transistor BD433 NPN, 4A TO-126

Transistors

Reference: TRBD433

Part.No: BD433

€1.20

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The BD433 is a medium-power NPN Bipolar Junction Transistor (BJT) in a TO-126 package. Widely used in audio amplifier driver and output stages, offering excellent linearity and thermal stability for small to medium audio applications.

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Description
Product Details

BD433 Medium-Power Audio Transistor - Driver & Output Stage Amplification

The BD433 is a medium-power NPN transistor engineered for audio amplification circuits. As the complementary partner to the BD434 (PNP), it forms the backbone of push-pull output stages in guitar amps, Hi-Fi audio systems, and radio transmitters, delivering robust current handling and excellent linearity across the audible spectrum.

Functions & Applications

Complementary Pair Design: Pairs perfectly with BD434 (PNP) for symmetrical push-pull amplification without crossover distortion.
Audio-Grade Linearity: Optimized for undistorted signal reproduction across voice and music frequencies.
Medium Power Handling: 4A collector current and 60V rating suitable for 1–5W audio output stages.
TO-126 Package: Easy to mount on PCB with integrated heatsink tabs for improved thermal dissipation.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-126
Collector-Emitter Voltage (Vceo)	60V
Max Collector Current (Ic)	4A
Power Dissipation (Pd)	12W
Mounting Type	Through-Hole (THT) with heatsink tabs

Frequently Asked Questions

Q: Can the BD433 drive a small speaker directly?
A: Yes, in low-power circuits (1–5W), the BD433 can function as the final output stage, provided a heatsink is used to dissipate the generated heat.

Q: What is the complementary PNP partner for BD433?
A: The BD434 is the complementary PNP transistor; together they form a balanced push-pull pair for distortion-free audio output stages.

Notes

Audio-grade small-signal pair transistor; heatsink recommended for continuous operation above 2W dissipation.

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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