BC237 NPN Transistor Pinout Datasheet

Introduction

The BC237 transistor is a widely used NPN bipolar junction transistor (BJT) designed for low noise and low current applications. It is commonly used in audio frequency amplifiers, signal processing circuits, and switching circuits where reliable performance and low distortion are required. Manufactured by several semiconductor brands, the BC237 belongs to the BC23x transistor family, which also includes BC238 and BC239, known for their similar characteristics but slightly different voltage ratings.

The BC237 transistor operates efficiently in low to medium current and voltage circuits, making it ideal for general-purpose signal amplification, sensor interface circuits, and electronic control boards. It has a maximum collector current of around 100mA and a collector-emitter voltage of 45V, offering sufficient range for most small signal applications. Its low noise figure allows it to be used in sensitive stages of preamplifiers and input amplifiers in audio equipment.

BC237 NPN Transistor

With a TO-92 package, the BC237 is compact and easy to mount on PCBs. It exhibits good gain stability across temperature variations, ensuring consistent operation even in demanding environments. Because of its robust electrical performance, it’s a reliable choice for both educational projects and professional electronic designs that require durable, high-quality components.

BC237 Pinout

Pin Configuration

Key Features

• General-purpose NPN transistor with low noise and stable gain.
• Suitable for both switching and signal amplification applications.
• Compact TO-92 plastic package for easy PCB mounting.
• Reliable performance over a wide temperature range.
• Compatible with many equivalents in the BC23x transistor family.
• Low collector leakage current for high circuit efficiency.
• High DC current gain (hFE) for improved amplification accuracy.

Characteristics

• Collector–Base Voltage (VCBO): 50V
• Collector–Emitter Voltage (VCEO): 45V
• Emitter–Base Voltage (VEBO): 5V
• Collector Current (IC): 100mA
• Power Dissipation (Ptot): 500mW
• DC Current Gain (hFE): 110 to 800
• Transition Frequency (fT): 100MHz
• Operating Junction Temperature (Tj): -65°C to +150°C
• Package Type: TO-92

Comparison : BC237 vs BC238 vs BC239

The BC237, BC238, and BC239 transistors are all part of the same low-noise, small-signal NPN family. They share the same TO-92 package, current handling capability, and general-purpose nature. The main difference lies in their maximum voltage ratings and noise performance.

The BC237 offers a moderate collector-emitter voltage rating of 45V, making it versatile for most signal applications. The BC238 supports slightly higher voltage levels (up to 50V), while the BC239 is optimized for ultra-low noise audio applications, making it a preferred choice in high-fidelity amplifiers and sensitive input stages. In general, they are electrically interchangeable for most low-power circuits, with the BC239 offering the best noise performance, followed by BC238 and BC237.

More Circuit Layouts

Key Applications of BC237 Transistor

• Audio preamplifier and amplifier stages
• General-purpose low-noise signal amplification
• Low current switching circuits
• Sensor and detector interface circuits
• Analog and digital control circuits
• Hobby and educational electronic projects

PNP Complementary Transistor

• The complementary PNP transistor for the BC237 is BC307. Both transistors can be used together in push-pull amplifier or complementary pair configurations for balanced and symmetrical signal amplification.

Equivalent of BC237 NPN Transistor

The BC237 has several equivalents and direct replacements with similar specifications, including:

• BC547, BC107, 2N3904, 2N2222, KT3102, C945

These transistors may differ slightly in voltage or gain range but can generally substitute the BC237 in most circuits after verifying the pin configuration.

(Pin configuration of some transistors mentioned above may different from BC237).

Datasheet of BC237 NPN Transistor

Click the following Button to download the datasheet of BC237 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 site.