BZX55C20 Diode Encyclopedia Entry

Introduction

The BZX55C20 diode is a crucial component in electronic circuits, belonging to the category of Zener diodes. This entry provides an overview of the basic information, specifications, pin configuration, functional features, advantages and disadvantages, working principles, application field plans, and alternative models of the BZX55C20 diode.

Basic Information Overview

• Category: Zener diode
• Use: Voltage regulation and protection in electronic circuits
• Characteristics:
  • Reverse breakdown voltage: 20V
  • Power dissipation: 500mW
  • Operating temperature range: -65°C to +200°C
• Package: Axial leaded, DO-35 glass package
• Essence: The BZX55C20 diode is designed to maintain a constant voltage across its terminals, making it suitable for voltage regulation and transient voltage suppression.
• Packaging/Quantity: Typically available in reels or bulk packaging.

Specifications

• Reverse Breakdown Voltage (Vz): 20V
• Power Dissipation (Ptot): 500mW
• Zener Impedance (ZZT): 10Ω
• Operating Temperature Range: -65°C to +200°C
• Forward Voltage (VF): 1.2V at 200mA
• Maximum Reverse Leakage Current (IR): 100nA

Detailed Pin Configuration

The BZX55C20 diode has an axial leaded package with two leads. The cathode is denoted by a black band on the body of the diode.

Functional Features

• Voltage Regulation: The BZX55C20 maintains a constant voltage across its terminals when operated in the reverse breakdown region.
• Transient Voltage Suppression: It protects sensitive electronic components from voltage spikes and transients.

Advantages and Disadvantages

Advantages

• Precise voltage regulation
• Compact size
• Wide operating temperature range

Disadvantages

• Limited power dissipation capability
• Susceptible to thermal runaway under high power conditions

Working Principles

The BZX55C20 operates based on the principle of the Zener effect, where it maintains a nearly constant voltage across its terminals when reverse biased. This allows it to regulate voltage within a circuit and protect sensitive components from overvoltage conditions.

Detailed Application Field Plans

The BZX55C20 diode finds extensive use in various applications, including: - Voltage regulation in power supplies - Overvoltage protection in electronic circuits - Signal clamping and limiting - Voltage reference circuits

Detailed and Complete Alternative Models

Some alternative models to the BZX55C20 diode include: - 1N5221B: 2.4V Zener diode - BZX85C15: 15V Zener diode - 1N4742A: 12V Zener diode - BZX79C5V6: 5.6V Zener diode

In conclusion, the BZX55C20 diode serves as a critical component in electronic circuits, providing precise voltage regulation and transient voltage suppression. Its compact size and wide operating temperature range make it suitable for diverse applications, although its limited power dissipation capability and susceptibility to thermal runaway are important considerations. Understanding its specifications, pin configuration, functional features, and alternative models is essential for effective utilization in electronic designs.

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