BC858B-HF: Transistor Encyclopedia Entry

Introduction

The BC858B-HF is a type of transistor that belongs to the category of small signal transistors. This entry provides an overview of its basic information, specifications, pin configuration, functional features, advantages and disadvantages, working principles, application field plans, and alternative models.

Basic Information Overview

• Category: Small Signal Transistor
• Use: Amplification and switching applications
• Characteristics: High current gain, low noise, and low power dissipation
• Package: SOT-23
• Essence: NPN Bipolar Junction Transistor
• Packaging/Quantity: Tape and Reel, 3000 units per reel

Specifications

• Collector-Base Voltage (VCBO): 30V
• Collector-Emitter Voltage (VCEO): 25V
• Emitter-Base Voltage (VEBO): 5V
• Collector Current (IC): 100mA
• Power Dissipation (PD): 250mW
• Transition Frequency (fT): 150MHz
• Operating Temperature Range: -55°C to 150°C

Detailed Pin Configuration

The BC858B-HF transistor has three pins: 1. Collector (C) 2. Base (B) 3. Emitter (E)

Functional Features

• High current gain (hFE)
• Low noise figure
• Low power dissipation
• Fast switching speed

Advantages and Disadvantages

Advantages

• High current gain for amplification
• Low noise performance
• Suitable for low-power applications
• Compact SOT-23 package

Disadvantages

• Limited collector current compared to other transistors
• Relatively low breakdown voltage

Working Principles

The BC858B-HF operates based on the principles of bipolar junction transistors. When a small current flows into the base terminal, it controls a much larger current between the collector and emitter terminals, allowing for amplification or switching of signals.

Detailed Application Field Plans

The BC858B-HF is commonly used in the following applications: - Audio amplifiers - Signal amplification circuits - Switching circuits - Oscillator circuits - Sensor interfaces

Detailed and Complete Alternative Models

Some alternative models to the BC858B-HF include: - BC847B - BC846B - 2N3904 - 2N2222A - 2N4401

In conclusion, the BC858B-HF transistor is a versatile component suitable for various amplification and switching applications, offering high current gain, low noise, and compact packaging. Its specifications, pin configuration, functional features, advantages and disadvantages, working principles, application field plans, and alternative models make it a valuable choice for electronic circuit design.

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