BD201 NPN Transistor Pinout Datasheet

Introduction

The BD201 is a high-power NPN silicon transistor designed primarily for audio amplifier output stages, power switching, and linear amplifier applications. It is widely recognized for its excellent thermal stability, robust performance, and reliable operation under high-voltage and high-current conditions. With its durable TO-202 or TO-220 package, the BD201 is well-suited for applications that demand efficient power handling and heat dissipation.

Engineers and hobbyists often use the BD201 transistor in class AB and class B amplifier designs, where it delivers smooth signal amplification with minimal crossover distortion. Its high collector-emitter voltage rating and strong current handling capability make it ideal for use in audio amplifiers, power supplies, and motor driver circuits. It performs exceptionally well in environments requiring stability, gain consistency, and dependable performance across a wide temperature range.

BD201 NPN Transistor

The BD201 transistor is the NPN counterpart of the BD202 or BD203 PNP transistor, forming a complementary pair that can be used in push-pull output stages. This complementary configuration enhances efficiency and linearity, which is crucial in high-fidelity audio and industrial amplifier circuits. Overall, the BD201 offers a balance between power, performance, and reliability, making it a trusted choice in both vintage and modern electronic designs.

Pinout of BD201

Key Features

• Designed for audio and power amplifier applications
• Suitable for high-voltage and high-current operation
• Strong linear amplification and thermal stability
• Ideal for use in push-pull complementary configurations
• Reliable switching and power handling capability
• Durable package with efficient heat dissipation

Specifications/Characteristics

• Collector-Emitter Voltage (Vce): 45V
• Collector-Base Voltage (Vcb): 60V
• Emitter-Base Voltage (Veb): 5V
• Collector Current (Ic): 8A
• Collector Power Dissipation (Ptot): 60W
• DC Current Gain (hFE): 30
• Transition Frequency (fT): 3 MHz
• Operating Junction Temperature: -65°C to +150°C
• Transistor Type: NPN
• Package Type: TO-220

Pin Configuration

Comparison Summary of BD201 (NPN), BD202 (PNP)

• The BD201 is an NPN power transistor optimized for high-current and high-voltage amplifier and switching applications, offering strong gain and fast response.
• The BD202, on the other hand, is its PNP complementary transistor, designed to operate in conjunction with the BD201 in push-pull amplifier stages.
• While both share similar voltage and current ratings, the BD201 conducts with positive polarity, and the BD203 operates with negative polarity in circuits.
• In essence, the BD201 handles the upper side of the signal waveform, whereas the BD202 amplifies the lower side, creating a balanced and distortion-free output in class AB audio amplifiers.

More Circuit Layouts

Key Applications of BD201 NPN Transistor

• Audio amplifier output stages
• Power switching circuits
• DC motor control systems
• Linear and class AB amplifiers
• Power regulation and control systems
• Industrial and consumer electronic equipment

PNP Complimentary Transistor

• The PNP complementary transistor of the BD201 is BD202.
  Both transistors are paired in push-pull output configurations and class AB amplifier stages, ensuring symmetric current handling and clean signal reproduction.

Equivalent Transistors of BD201 NPN Transistor

• BD203
• 2N3055 (similar NPN power transistor)
• BD237
• TIP31A
• MJ802
• NTE152

(Pin configuration of some transistors mentioned here may different from BD201).

Datasheet of BD201 NPN Transistor

Click the following Button below to download the datasheet of BD201 Transistor :

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