The C828 NPN Silicon Transistor is a classic low-power, high-gain epitaxial transistor designed for general-purpose switching and amplification. At Electrapac, we recommend this transistor for electronics students and repair technicians in Bangladesh who are working on audio pre-amplifiers, signal processing circuits, or low-current switching tasks.

Product Overview

Housed in the industry-standard TO-92 plastic package, the C828 is highly valued for its high DC current gain (hFE​) and low noise characteristics. While it is often used in vintage radio and television circuits, it remains a favorite for modern DIYers building sensitive sensor triggers or small signal oscillators where a 2N2222 might be overkill and a BC547 is the nearest equivalent.

Key Features for Electrapac Customers

• High Sensitivity: Its high gain (hFE​) allows it to amplify very weak signals from microphones or low-power sensors into a usable voltage for your microcontroller.

• Low Noise Figure: Specifically designed to keep electronic "hiss" to a minimum, making it ideal for the first stage of an audio amplifier circuit.

• High Frequency Response: With a 220 MHz transition frequency, it can handle high-speed switching and RF (Radio Frequency) oscillation tasks with ease.

• Compact & Reliable: The tiny TO-92 footprint makes it easy to pack many transistors into a small breadboard or stripboard project.

• Standard NPN Logic: Works perfectly with 5V and 12V systems, allowing you to use it as a simple "NOT" gate or a switch for small LEDs.

Wiring & Pinout Guide

To use the Electrapac C828 correctly, you must identify the pins. Looking at the flat side of the transistor with the leads pointing down:

1. Pin 1 (Left): Emitter (E) – Connect to Ground for standard NPN switching.

2. Pin 2 (Middle): Collector (C) – Connect to the negative side of your load (e.g., an LED or buzzer).

3. Pin 3 (Right): Base (B) – The control pin. Connect this to your signal source via a resistor.

Pro-Tip: The C828 is a "small-signal" transistor. Do not try to drive a DC motor or a large relay directly with it, as the 100mA limit will be exceeded. For heavier loads, use the C828 to trigger a larger transistor like a TIP122 or a 2N2222.

Primary Applications

• Audio Pre-Amplifiers: Boosting weak audio signals from microphones before they reach a power amp.

• Signal Switching: Using a low-power sensor signal to trigger an LED or a small piezo buzzer.

• Oscillator Circuits: Building simple "Blink" circuits or tone generators for electronic toys.

• Sensor Buffering: Acting as a high-impedance buffer for sensitive light or temperature sensors.

• Logic Gates: Creating basic AND, OR, and NOT gates for educational digital logic experiments.

Why Shop at Electrapac?

We source our C828 Transistors with high-purity silicon to ensure they maintain their high-gain rating even under varying temperature conditions. Visit us at www.electrapac.com for the essential semiconductors that serve as the foundation of your analog designs.