SMDJ18 - TVS Diode Encyclopedia Entry

Introduction

The SMDJ18 is a Transient Voltage Suppressor (TVS) diode designed to protect sensitive electronic components from voltage transients. This entry provides an overview of the SMDJ18, including its product category, basic information, specifications, pin configuration, functional features, advantages and disadvantages, working principles, application field plans, and alternative models.

Product Category

The SMDJ18 belongs to the category of TVS diodes, which are semiconductor devices used to protect electronic circuits from overvoltage transients caused by lightning, electrostatic discharge (ESD), and other transient voltage events.

Basic Information Overview

• Use: The SMDJ18 is used to protect sensitive electronic components from voltage transients.
• Characteristics: It offers low clamping voltage, high surge capability, and fast response time.
• Package: The SMDJ18 is available in a surface-mount package.
• Essence: Its essence lies in providing robust transient voltage protection for electronic circuits.
• Packaging/Quantity: It is typically packaged in reels or tubes, with varying quantities depending on the manufacturer's specifications.

Specifications

• Peak Pulse Power: 3000 W
• Breakdown Voltage: 18 V
• Operating Voltage: 15.3 V
• Reverse Standoff Voltage: 15 V
• Clamping Voltage: 24.4 V
• Maximum Reverse Leakage Current: 1 µA
• Operating Temperature Range: -55°C to 150°C

Detailed Pin Configuration

The SMDJ18 typically has two pins, with the cathode connected to the ground and the anode connected to the protected circuit.

Functional Features

• Transient Voltage Suppression: Provides protection against voltage transients by diverting excess current away from sensitive components.
• Fast Response Time: Responds quickly to transient events, minimizing the risk of damage to the protected circuit.

Advantages and Disadvantages

Advantages

• High surge capability
• Low clamping voltage
• Fast response time
• Compact surface-mount package

Disadvantages

• Limited to specific voltage ratings
• May require additional circuitry for comprehensive overvoltage protection

Working Principles

When a transient voltage event occurs, the SMDJ18 conducts current to divert the excess energy away from the protected circuit, thereby limiting the voltage across the circuit.

Detailed Application Field Plans

The SMDJ18 is commonly used in various applications, including: - Telecommunication equipment - Industrial control systems - Automotive electronics - Consumer electronics - Power supplies

Detailed and Complete Alternative Models

• SMDJ5.0A: Breakdown Voltage - 5.0 V
• SMDJ12A: Breakdown Voltage - 12 V
• SMDJ24A: Breakdown Voltage - 24 V
• SMDJ36A: Breakdown Voltage - 36 V

In conclusion, the SMDJ18 TVS diode offers robust transient voltage protection for a wide range of electronic applications, making it an essential component in safeguarding sensitive circuits from damaging voltage transients.

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