BC558 Transistor (Pack of 5)

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Component Name

Description

The BC558 Transistor is a general-purpose bipolar junction transistor (BJT) designed for low-power applications. It is a PNP transistor, meaning the current flows from the emitter to the collector. This component is commonly used in electronic circuits for amplification, switching, and voltage regulation.

Functionality

Active region: The transistor acts as an amplifier, where a small input signal at the base is amplified to produce a larger output signal at the collector.
Saturation region: The transistor acts as a switch, where the input signal at the base is sufficient to fully turn on the transistor, allowing maximum current to flow between the collector and emitter.
Cut-off region: The transistor acts as an open switch, where the input signal at the base is insufficient to turn on the transistor, and minimal current flows between the collector and emitter.

The BC558 Transistor acts as a current-controlled device, where the base current controls the flow of current between the collector and emitter. The transistor can operate in three modes

Key Features

PNP polarity: The transistor is a PNP type, meaning the emitter is positive with respect to the collector.
Low current gain: The BC558 has a current gain (hFE) of 110-220, making it suitable for low-power applications.
Low voltage operation: The transistor can operate at a maximum collector-emitter voltage of 30V.
High collector current: The transistor can handle a maximum collector current of 100mA.
Low power dissipation: The BC558 has a power dissipation of 500mW, making it suitable for battery-powered devices.
Package type: The transistor comes in a TO-92 package, a small, plastic-encased package with three leads (base, collector, and emitter).
Pack of 5: The component is sold in packs of 5, making it convenient for prototyping, testing, and production.

Package type

TO-92

Pinout

+ Base	1 (left side)
+ Collector	2 (center)
+ Emitter	3 (right side)

Dimensions

4.2 x 2.8 x 1.4 mm

Weight

approximately 0.2 grams per transistor

Applications

Audio amplifiers: The BC558 can be used as a pre-amplifier or driver stage in audio circuits.
Switching circuits: The transistor can be used as a switch in digital circuits, such as power supplies, motor controls, and relay drivers.
Voltage regulators: The BC558 can be used as a pass transistor in voltage regulator circuits.
Low-power amplifiers: The transistor is suitable for use in low-power amplifier circuits, such as in radio frequency (RF) amplifiers.

Precautions

Handling: Handle the transistor by the edges to prevent damage from static electricity.
Polarity: Ensure correct polarity when installing the transistor, as incorrect polarity can cause damage or destruction.
Voltage and current limits: Do not exceed the maximum voltage and current ratings to prevent damage or destruction.

By following proper handling and installation procedures, the BC558 Transistor can provide reliable performance in a variety of low-power applications.

Pin Configuration

BC558 Transistor (Pack of 5) Documentation
Overview
The BC558 is a general-purpose PNP transistor suitable for use in a wide range of electronic circuits, including amplifiers, switches, and low-noise amplifiers. It is a popular choice among electronics enthusiasts and professionals due to its high current gain, low saturation voltage, and high reliability.
Pinout Diagram
The BC558 transistor has three pins, labeled as follows:
Pin Structure:
1. Base (B)
Function: Controls the flow of current between the collector and emitter.
Connection: Connect to a voltage source or a signal input.
Characteristics: Requires a small voltage to control the transistor's operation.
2. Collector (C)
Function: Sinks current from an external circuit.
Connection: Connect to a positive voltage source or a load.
Characteristics: Can handle higher current than the emitter.
3. Emitter (E)
Function: Sources current to an external circuit.
Connection: Connect to a negative voltage source or a load.
Characteristics: Typically connected to ground or a lower voltage potential.
Pin Connection Structure:
When connecting the BC558 transistor, follow this structured approach:
Step 1: Connect the Base (B)
+ Connect the base pin to a voltage source or a signal input.
+ Ensure the voltage level is within the recommended range (typically 0 to 5V).
Step 2: Connect the Collector (C)
+ Connect the collector pin to a positive voltage source or a load.
+ Ensure the collector voltage is higher than the emitter voltage.
Step 3: Connect the Emitter (E)
+ Connect the emitter pin to a negative voltage source or a load.
+ Ensure the emitter voltage is lower than the collector voltage.
Important Notes:
Always handle the transistor with care to avoid damage from static electricity or excessive heat.
Use a suitable heat sink if the transistor is expected to handle high currents or operate in high-temperature environments.
Ensure proper polarity when connecting the transistor to avoid damage or incorrect operation.
By following these guidelines, you can effectively connect and utilize the BC558 transistor in your electronic projects.

Code Examples

BC558 Transistor (Pack of 5) Documentation

Overview

The BC558 is a general-purpose PNP transistor widely used in electronic circuits for switching, amplification, and voltage regulation. This pack of 5 transistors is ideal for prototyping, development, and production of IoT projects. The BC558 transistor features a high current gain, low saturation voltage, and high switching speed, making it suitable for a variety of applications.

Pinout

The BC558 transistor has three pins:

Base (B): Pin 1
 Collector (C): Pin 2
 Emitter (E): Pin 3

Absolute Maximum Ratings

Collector-Base Voltage (VCB): 30V
 Collector-Emitter Voltage (VCE): 30V
 Emitter-Base Voltage (VEB): 5V
 Collector Current (IC): 100mA
 Base Current (IB): 5mA

Example 1: Simple Switching Circuit

In this example, we'll use the BC558 transistor as a switch to control an LED. The transistor will be used to switch the LED on and off based on a digital input from a microcontroller.

Circuit Diagram

```markdown
  +---------------+
  |  Microcontroller  |
  +---------------+
           |
           |
           v
  +---------------+
  |  BC558 Transistor  |
  |  (Base)          |
  |  (Collector)     |
  |  (Emitter)      |
  +---------------+
           |
           |
           v
  +---------------+
  |  LED          |
  |  (Anode)      |
  |  (Cathode)    |
  +---------------+
           |
           |
           v
  +---------------+
  |  Resistor     |
  |  (1 k)      |
  +---------------+
```

Code Example (Arduino)
```cpp
const int ledPin = 13;  // Choose a digital pin
const int basePin = 2;  // Choose a digital pin for the transistor base

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(basePin, OUTPUT);
}

void loop() {
  digitalWrite(basePin, HIGH);  // Turn the transistor ON
  digitalWrite(ledPin, HIGH);    // Turn the LED ON
  delay(1000);

digitalWrite(basePin, LOW);   // Turn the transistor OFF
  digitalWrite(ledPin, LOW);   // Turn the LED OFF
  delay(1000);
}
```
Example 2: Amplifier Circuit

In this example, we'll use the BC558 transistor as an amplifier to increase the signal strength of a weak input signal.

Circuit Diagram

```markdown
  +---------------+
  |  Input Signal  |
  |  (Vin)        |
  +---------------+
           |
           |
           v
  +---------------+
  |  Resistor     |
  |  (1 k)      |
  +---------------+
           |
           |
           v
  +---------------+
  |  BC558 Transistor  |
  |  (Base)          |
  |  (Collector)     |
  |  (Emitter)      |
  +---------------+
           |
           |
           v
  +---------------+
  |  Output Signal |
  |  (Vout)       |
  +---------------+
           |
           |
           v
  +---------------+
  |  Resistor     |
  |  (2 k)      |
  +---------------+
```

Code Example (No code required, this is an analog circuit)
Note: This example requires a thorough understanding of analog electronics and amplifier design principles.

Example 3: Voltage Regulator Circuit

In this example, we'll use the BC558 transistor as a voltage regulator to regulate a 9V power supply to 5V.

Circuit Diagram

```markdown
  +---------------+
  |  9V Power Supply |
  +---------------+
           |
           |
           v
  +---------------+
  |  Resistor     |
  |  (1 k)      |
  +---------------+
           |
           |
           v
  +---------------+
  |  Zener Diode  |
  |  (5.1V)      |
  +---------------+
           |
           |
           v
  +---------------+
  |  BC558 Transistor  |
  |  (Base)          |
  |  (Collector)     |
  |  (Emitter)      |
  +---------------+
           |
           |
           v
  +---------------+
  |  Output (5V)   |
  +---------------+
```

Code Example (No code required, this is an analog circuit)
Note: This example requires a thorough understanding of analog electronics and voltage regulator design principles.

Remember to always follow proper safety precautions when working with electronic circuits, and ensure that your projects comply with local regulations and safety standards.