BC556 PNP Transistor Pinout Datasheet

Introduction

The BC556 PNP transistor is a general-purpose low-noise small-signal transistor designed for audio amplification and switching applications. Belonging to the BC55x transistor family, it is particularly suited for sensitive low-frequency and audio circuits where minimal distortion and noise are critical. With a maximum collector-emitter voltage of -65V and a collector current rating of -100mA, the BC556 can handle moderate loads while ensuring efficient amplification.

The BC556 comes in three gain group classifications: BC556A, BC556B, and BC556C, with DC current gain (hFE) ranging from 110 to 800. This classification allows circuit designers to select a transistor variant based on the amplification requirements of their circuit. Its low noise figure and transition frequency of 150 MHz make it highly reliable for preamplifiers, audio stages, and signal conditioning modules.

BC556 PNP Transistor

Packaged in the commonly available TO-92 package, the BC556 is an affordable and compact solution for students, hobbyists, and engineers. It is commonly used in consumer electronics, educational circuits, industrial control systems, and general-purpose analog designs, where it provides excellent stability, durability, and noise immunity.

BC556 Pinout

BC556 Transistor Key Features

• General-purpose PNP transistor for small-signal applications.
• Suitable for low-noise audio amplification.
• Available in three gain classifications (A, B, C) for design flexibility.
• Cost-effective, compact TO-92 package for easy integration.
• Reliable and versatile for analog and switching circuits.
• Compatible with a wide range of NPN complementary transistors.

Specifications/Characteristics of BC556 PNP Transistor

• Maximum Collector-Base Voltage (Vcb): -80V
• Maximum Collector-Emitter Voltage (Vce): -65V
• Maximum Emitter-Base Voltage (Veb): -5V
• Maximum Collector Current (Ic): -100mA
• Power Dissipation (Ptot): 500mW
• DC Current Gain (hFE): 110 – 800 (depending on version A, B, or C)
• Transition Frequency (ft): 150 MHz (typical)
• Noise Figure: Low (ideal for audio circuits)
• Operating Temperature Range: -65°C to +150°C
• Package: TO-92

BC556 Pin Configuration

More Circuit Layouts

Key Applications of BC556 PNP Transistor

• Low-noise audio frequency amplifiers.
• General-purpose signal amplification.
• Switching small loads up to 100mA.
• Preamplifiers and audio input stages.
• Oscillators and waveform generation circuits.
• Consumer electronics and DIY projects.
• Industrial control and automation circuits.

NPN Complimentary Transistor

BC546 (NPN) is the complementary transistor to BC556.

Equivalent Transistors of BC556

• BC557 (similar voltage and current rating).
• BC558 (general-purpose PNP, lower voltage).
• BC559 (low-noise PNP alternative).
• 2N3906 (PNP small-signal transistor).
• 2N2907 (PNP transistor with higher current capacity).

(Pin configuration of some transistors mentioned here may different from BC556).

Datasheet of BC556 PNP Transistor

Click the following Button below to download the datasheet of BC556 Transistor :

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