BD175 NPN Transistor Pinout Datasheet

Introduction

The BD175 is a silicon NPN power transistor designed for medium power switching and audio amplifier applications. It delivers excellent performance in linear and switching circuits, making it ideal for audio frequency amplifiers, driver stages, and voltage regulators. The transistor offers high reliability, good thermal stability, and a robust design suitable for both industrial and consumer-grade electronic circuits.

Encapsulated in a TO-126 package, the BD175 provides efficient heat dissipation and easy PCB mounting for compact circuit designs. It supports a maximum collector current of 2A and a collector-emitter voltage of 60V, which allows it to operate effectively in moderate power amplifier circuits and control systems. The transistor exhibits a high DC current gain (hFE) and excellent linearity, ensuring clean amplification with minimal distortion, which is essential for high-quality audio applications.

BD175 NPN Transistor

The BD175 is commonly used in audio output stages, signal amplifiers, and power driver circuits. Due to its stable frequency response and low saturation voltage, it performs efficiently in DC-DC converters, relay drivers, and power control circuits. It is the NPN complementary device to the BD176 or BD177 PNP transistors, forming a well-matched pair for push-pull audio amplifier configurations or class AB output stages.

Pinout of BD175

Key Features

• NPN silicon power transistor for medium power applications
• High collector current capability
• Wide operating voltage range
• Low collector-emitter saturation voltage for efficient switching
• Excellent linear amplification characteristics
• Good frequency response for audio and signal applications
• Reliable thermal and electrical stability

Specifications/Characteristics

• Collector-Emitter Voltage (VCEO): 45V
• Collector-Base Voltage (VCBO): 45V
• Emitter-Base Voltage (VEBO): 5V
• Collector Current (IC): 3A maximum
• Total Power Dissipation (Ptot): 15W (with proper heatsink)
• DC Current Gain (hFE): 40 to 250 (depending on test conditions)
• Transition Frequency (fT): 3MHz typical
• Operating Junction Temperature (Tj): 150°C max
• Package Type: TO-126 (Plastic or Metal tab)

Pin Configuration

Comparison Summary (BD175, BD177, BD179)

• The BD175 is an NPN transistor rated for 60V and 2A, offering high current gain and medium frequency response suitable for driver and audio stages.
• The BD177 is the PNP complementary of BD175, featuring similar voltage and current characteristics but opposite polarity, ideal for pairing in push-pull amplifier circuits.
• The BD179 is a slightly more powerful NPN version with higher voltage handling (up to 80V) and greater frequency response, making it better suited for higher voltage amplifiers or switching applications requiring more robust performance.

More Circuit Layouts

Key Applications of BD175 NPN Transistor

• Audio power amplifier stages
• Class AB push-pull audio amplifiers
• Driver and pre-driver circuits
• Voltage regulator output stages
• Power control and switching circuits
• Relay and solenoid drivers
• Industrial control modules

PNP Complimentary Transistor

• The PNP complementary transistor to BD175 is BD176.
  They are often paired in push-pull amplifier or class AB output circuits for symmetrical operation, ensuring balanced current flow and low harmonic distortion.

Equivalent Transistors of BD175 NPN Transistor

• BD135
• BD139
• BD179
• 2N6121
• TIP31
• MJE3055
• 2SD882

(Pin configuration of some transistors mentioned here may different from BD175).

Datasheet of BD175 NPN Transistor

Click the following Button below to download the datasheet of BD175 Transistor :

More projects, You may like:

• Video Transmitter DIY Homemade FM Radio Transmitter
• Adjustable Power Supply DIY Battery Charger
• 12V-220V 500 Watt inverter DIY Homemade
• MPPT Solar Charge Controller DIY Homemade
• DIY LA4440 bass amplifier homemade

For more project and circuit diagrams, you can go through the Schematics in the main menu where you can find many interesting projects and circuit diagrams like audio amplifier circuits, voltage booster circuit, battery charger circuit and timer circuits etc., which are all beginner circuit projects. Feel free to check them out!

Thank you for visiting the article.