Power Transistor BD434 PNP, 8A TO-126

Power Transistor BD434 PNP, 8A TO-126

Transistors

Reference: TRBD434

Part.No: BD434

€1.20

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The BD434 is a high-performance PNP power transistor in a TO-126 package, widely recognized for audio amplification and driver stages. As the complementary counterpart to the BD433 (NPN), it excels in linear amplifier output and pre-driver applications.

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Description
Product Details

BD434 PNP Power Transistor - Audio Amplifier Driver & Output Stage

The BD434 is a complementary PNP power transistor, recognized in audio design circles for exceptional linearity and thermal stability. Whether driving the output stage of a guitar amplifier or functioning as a pre-driver in larger audio systems, the BD434 delivers consistent performance across the audio spectrum.

Functions & Applications

Complementary Pair: Perfect PNP match for the NPN BD433, enabling true push-pull output stages.
Audio-Grade Linearity: Designed specifically for low-distortion amplification across the audio frequency range.
Moderate Power Handling: 8A collector current, suitable for driver and output stages in mid-to-high-power amplifiers.
TO-126 Package: Metal-backed design allows direct heatsink mounting (with mica insulation) for improved thermal performance.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	PNP
Package / Case	TO-126
Collector-Emitter Voltage (Vceo)	−100V
Max Collector Current (Ic)	8A
Power Dissipation (Pd)	40W
Mounting Type	Through-Hole (THT) with Heatsink Tab

Frequently Asked Questions

Q: Can I mount the BD434 directly to a heatsink?
A: Yes, but a mica insulation pad is required between the transistor and the heatsink. The metal back (collector tab) is not grounded—it is internally connected to the collector pin—so electrical isolation is essential.

Q: What is the NPN complementary pair to the BD434?
A: The BD433 is the direct NPN complement, matching voltage and current ratings for true symmetric push-pull output stages in audio amplifiers.

Notes

Metal back tab is internally connected to collector (not grounded). Use mica insulation when mounting to heatsink.

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: PNP
Transistor Case Style: TO-126

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