BD177 NPN Transistor Pinout Datasheet

Introduction

The BD177 is a silicon NPN power transistor specifically designed for medium power linear and switching applications. It is widely used in audio amplifiers, driver circuits, voltage regulators, and control systems where high current and voltage handling capabilities are required. The transistor offers high reliability, excellent linear amplification, and low saturation voltage, making it a popular choice for both industrial and consumer electronics.

Packaged in the durable TO-126 case, the BD177 provides efficient heat dissipation and mechanical stability, suitable for PCB mounting and amplifier designs. With a maximum collector current of 2A and collector-emitter voltage of 60V, it delivers strong performance in push-pull audio output stages and signal amplifier configurations. Its wide gain range (hFE) ensures good performance across varying load conditions, maintaining stable operation even under temperature fluctuations.

BD177 NPN Transistor

This transistor is commonly used in audio power output stages, medium power amplifiers, and switching regulators. Due to its high voltage tolerance and stable frequency response, it performs effectively in class AB amplifier circuits. The PNP complementary transistor to BD177 is BD178 (or BD176 in some cases), allowing designers to build symmetrical push-pull configurations for clear, distortion-free sound output in audio amplifiers and radio frequency systems.

Pinout of BD177

Key Features

• NPN silicon power transistor with high current capability
• Suitable for medium power audio and switching circuits
• High voltage tolerance up to 60V
• Low collector-emitter saturation voltage for improved efficiency
• Excellent linearity and gain stability
• TO-126 package for easy mounting and thermal control
• Reliable under wide temperature ranges
• Complementary to BD178 or BD176 (PNP)

Specifications/Characteristics

• Collector-Emitter Voltage (VCEO): 60V
• Collector-Base Voltage (VCBO): 60V
• Emitter-Base Voltage (VEBO): 5V
• Collector Current (IC): 3A
• Total Power Dissipation (Ptot): 15W (with proper heatsink)
• DC Current Gain (hFE): 40 to 250 (depending on collector current)
• Transition Frequency (fT): 3MHz typical
• Junction Temperature (Tj): up to 150°C
• Package Type: TO-126 (Plastic, heat-tab package)

Pin Configuration

Comparison Summary (BD175, BD177, BD179)

• The BD175 is an earlier NPN transistor version designed for 45V and 3A applications, primarily suited for driver stages and general-purpose medium power circuits.
• The BD177, also an NPN transistor, shares similar current and voltage ratings but provides improved frequency response and enhanced thermal performance, making it ideal for push-pull amplifiers and higher fidelity applications.
• The BD179 is the upgraded member of this family, offering a higher voltage rating (up to 80V) and superior gain performance at higher frequencies, making it more suitable for demanding audio and high-voltage switching designs.

More Circuit Layouts

Key Applications of BD177 NPN Transistor

• Audio frequency power amplifiers
• Push-pull amplifier output stages
• Power control and voltage regulation circuits
• Relay and motor driver circuits
• Switching power supplies
• Industrial and consumer-grade electronic equipment

PNP Complimentary Transistor

• The PNP complementary transistor of BD177 is BD178 (or in some references BD176).
  Both are frequently paired together in push-pull amplifier designs and class AB output circuits for balanced current delivery and efficient linear amplification.

Equivalent Transistors of BD177 NPN Transistor

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

(Pin configuration of some transistors mentioned here may different from BD177).

Datasheet of BD177 NPN Transistor

Click the following Button below to download the datasheet of BD177 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.