BC559 PNP Transistor Pinout Datasheet

Introduction

The BC559 is a general-purpose PNP bipolar junction transistor (BJT) designed primarily for low-noise audio amplification and signal processing applications. It is widely used in audio preamplifiers, driver circuits, and low-level signal stages, where minimal distortion and clean amplification are essential. The transistor operates with a collector-emitter voltage (VCEO) of –30V and a maximum collector current (IC) of –100mA, making it ideal for low-power analog and linear circuits.

Manufactured using silicon planar epitaxial technology, the BC559 ensures low noise figure, excellent gain stability, and reliable performance across a wide range of operating temperatures. Its TO-92 plastic package makes it compact, cost-effective, and easy to integrate into various PCB designs. It is often preferred by audio engineers and hobbyists for designing low-frequency preamplifiers, tone control stages, and microphone amplifiers due to its stable gain and low leakage current.

BC559 PNP Transistor

The BC559 transistor is part of the BC556–BC560 transistor family, each differing slightly in voltage ratings and gain characteristics. Among these, the BC559 offers a balanced performance between voltage capability and low noise. Its reliability, affordability, and wide availability make it one of the most popular PNP transistors in the electronics industry for signal amplification, switching, and small-signal audio processing applications.

Pinout of BC559

BC559 Transistor Key Features

• Low noise PNP transistor for audio frequency applications
• Designed for general-purpose small-signal amplification
• High DC current gain ensures efficient performance
• Stable operation over a wide temperature range
• Suitable for low-frequency analog and linear circuits
• Compact TO-92 plastic package

Specifications/Characteristics of BC559 PNP Transistor

• Collector–Emitter Voltage (VCEO): –30V
• Collector–Base Voltage (VCBO): –30V
• Emitter–Base Voltage (VEBO): –5V
• Collector Current (IC): –100mA maximum
• Power Dissipation (Ptot): 500mW
• DC Current Gain (hFE): 110 to 800
• Transition Frequency (fT): 150MHz typical
• Noise Figure: 2dB typical
• Junction Temperature Range: –55°C to +150°C
• Package Type: TO-92

BC559 Pin Configuration

More Circuit Layouts

Key Applications of BC559 PNP Transistor

• Low-noise audio preamplifiers
• Signal amplification and conditioning circuits
• General-purpose PNP transistor applications
• Analog low-frequency amplifiers
• Small signal switching circuits
• Sensor and detector interface circuits

NPN Complimentary Transistor

The NPN complementary transistor of BC559 is BC549. Both BC549 and BC559 are commonly used in push-pull amplifier configurations and audio amplifier designs, providing balanced operation between NPN and PNP stages for distortion-free sound reproduction.

Equivalent Transistors of BC559

• BC556
• BC557
• BC558
• BC560
• 2N2907
• 2N3906
• S8550
• MPS2907A

(Pin configuration of some transistors mentioned here may different from BC559).

Datasheet of BC559 PNP Transistor

Click the following Button below to download the datasheet of BC559 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.