BD434 PNP Transistor Pinout Datasheet

Introduction

The BD434 is a silicon epitaxial-base PNP medium-power transistor engineered for linear amplification and switching applications. It belongs to a complementary pairing family, designed to work alongside NPN devices like BD433 in push-pull and audio output stages. Its PNP polarity enables it to handle negative-half cycles or high-side switching in amplifier circuits.

BD434 PNP Transistor Datasheet
BD434 PNP Transistor Datasheet



This transistor is housed in a TO-126 (SOT-32 / JEDEC SOT-32) plastic package, offering moderate thermal dissipation when mounted on a heatsink or circuit board. Its construction delivers good balance among gain, saturation voltage, and robustness, making it suitable for moderate-power circuits.

BD434 PNP Transistor

BD434 PNP Transistor Pinout
BD434 PNP Transistor




In practice, BD434 is widely used in audio amplifier output stages, complementary driver circuits, and general power switching roles where symmetrical PNP conduction is needed. Because it complements BD433 (its NPN counterpart), it ensures symmetrical performance in push-pull layouts, helping to reduce distortion and balance output.

Pinout of BD434

BD434 PNP Transistor Pinout
BD434 PNP Transistor Pinout



Key Features

  • PNP polarity for negative conduction / high-side switching
  • Matched for complementary pairing with NPN devices
  • Reliable performance in moderate-power amplifier / driver circuits
  • Plastic package suitable for moderate heatsinking
  • Good thermal and mechanical stability
  • Widely used in audio and push-pull applications

Specifications/Characteristics

  • Collector-Base Breakdown Voltage, VCBO = –22 V
  • Collector-Emitter Breakdown Voltage, VCEO = –22 V
  • Collector-Emitter Sustaining Voltage, VCE(sus) = –22 V
  • Emitter-Base Breakdown Voltage, VEBO = –5 V
  • Collector Current, Continuous IC = –4 A
  • Collector Peak (Pulse) Current, ICM = –7 A
  • Total Power Dissipation, Ptot = 36 W (case temperature = 25 °C)
  • Maximum Junction Temperature, Tj = 150 °C
  • Storage Temperature Range, Tstg = –65 to +150 °C
  • DC Current Gain, hFE = 85 (at IC = 0.5 A)
  • DC Current Gain, hFE = 40 (at IC = 10 mA)
  • DC Current Gain, hFE = 50 (at IC = 2 A)
  • Collector-Emitter Saturation Voltage, VCE(sat) = –0.58 V (IC = –2 A, IB = –0.2 A)
  • Base-Emitter On Voltage, VBE(on) ≈ –1.1 to –1.2 V
  • Transition Frequency, fT = 3 MHz

Pin Configuration

Pin#Pin NamePin Description
1EmitterOutput / current source terminal
2CollectorMain current sink terminal
3BaseControl / bias input terminal
BD434 Pin Configuration



Comparison of BD434 (PNP) vs BD433 (NPN) Complementary

  • BD434 is a PNP transistor intended to complement BD433 (NPN), used in symmetrical amplifier or driver circuits. It conducts for negative polarity or high-side segments in push-pull operations.
  • BD433, on the other hand, is the NPN side of the pair. It conducts positive cycles or lower-side segments in complementary stages.
  • Because they are designed as complements, BD434 and BD433 share similar current, gain, power, and thermal characteristics (with reversed polarities), allowing them to operate together symmetrically in push-pull or class-AB amplifier designs.

More Circuit Layouts




Key Applications of BD434 PNP Transistor

  • Push-pull amplifier output stages
  • Audio amplifier driver circuits
  • Complementary driver / output stage designs
  • Switching / power regulation circuits requiring PNP conduction
  • General-purpose PNP transistor applications in medium-power systems



NPN Complimentary Transistor

  • The complementary NPN transistor for BD434 is BD433.

Equivalent Transistors of BD434 PNP Transistor

Possible equivalents or substitution options for BD434 include:

  • BD436 (higher voltage PNP in same series)
  • BD438 (even higher-voltage PNP sibling)
  • Other PNP medium-power transistors such as TIP32C, MJE2955, or devices with matching current/voltage specs
  • PNP power transistors in TO-126 / TO-220 packages with similar ratings

Datasheet of BD434 PNP Transistor

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BD434 PNP Transistor Pinout
BD434 PNP Transistor Datasheet

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