Vishay Semiconductor Diodes Division
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SMF18A-HM3-18
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SMF18A-HM3-18 Product Overview

Introduction

The SMF18A-HM3-18 is a component belonging to the category of surface mount TVS diodes. This entry provides an in-depth 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: Surface Mount TVS Diodes
  • Use: Protection against transient voltage events
  • Characteristics: Low clamping voltage, fast response time, high surge capability
  • Package: SOD-123FL
  • Essence: Transient voltage suppression
  • Packaging/Quantity: Tape & Reel, 3000 units per reel

Specifications

  • Peak Pulse Power: 400W
  • Breakdown Voltage Range: 15V to 28V
  • Operating Temperature Range: -55°C to +150°C
  • RoHS Compliant: Yes

Detailed Pin Configuration

The SMF18A-HM3-18 has a standard SOD-123FL package with two pins. Pin 1 is the cathode, and pin 2 is the anode.

Functional Features

  • Transient Voltage Suppression: Provides protection against transient voltage events by diverting excess current away from sensitive components.
  • Fast Response Time: Reacts quickly to transient voltage spikes, minimizing the risk of damage to connected circuits.
  • Low Clamping Voltage: Limits the voltage across the protected circuit during transient events, reducing the risk of damage.

Advantages and Disadvantages

Advantages

  • Effective protection against transient voltage events
  • Fast response time
  • RoHS compliant

Disadvantages

  • Limited breakdown voltage range compared to some alternative models

Working Principles

The SMF18A-HM3-18 operates based on the principle of avalanche breakdown, where it rapidly conducts excess current when a transient voltage event occurs, thereby protecting downstream components.

Detailed Application Field Plans

The SMF18A-HM3-18 is suitable for various applications, including: - Consumer electronics - Telecommunication equipment - Industrial automation systems - Automotive electronics - Power supplies

Detailed and Complete Alternative Models

Some alternative models to consider include: - SMAJ15A: Similar peak pulse power and breakdown voltage range - SMBJ20CA: Higher breakdown voltage range - SMLJ15A: Higher peak pulse power

In conclusion, the SMF18A-HM3-18 offers effective transient voltage suppression with fast response times, making it suitable for a wide range of applications.

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  1. What is SMF18A-HM3-18?

    • SMF18A-HM3-18 is a surface mount TVS diode designed to protect sensitive electronics from voltage transients induced by lightning and other transient voltage events.

  2. What are the key features of SMF18A-HM3-18?

    • The key features include a low clamping voltage, high surge capability, and compatibility with automated placement equipment.

  3. In what applications can SMF18A-HM3-18 be used?

    • SMF18A-HM3-18 is commonly used in industrial automation, telecommunications equipment, and power over Ethernet (PoE) applications.

  4. What is the maximum peak pulse current of SMF18A-HM3-18?

    • The maximum peak pulse current is typically 100A.

  5. How does SMF18A-HM3-18 protect against transient voltage events?

    • It provides a low clamping voltage to divert excessive current away from sensitive components, protecting them from damage.

  6. Is SMF18A-HM3-18 RoHS compliant?

    • Yes, it is RoHS compliant, making it suitable for use in environmentally sensitive applications.

  7. What is the operating temperature range of SMF18A-HM3-18?

    • The operating temperature range is typically -55°C to +150°C.

  8. Can SMF18A-HM3-18 be used in automotive applications?

    • Yes, it is suitable for use in automotive electronics to protect against voltage transients.

  9. Does SMF18A-HM3-18 require any special handling during assembly?

    • No special handling is required, and it is compatible with standard surface mount assembly processes.

  10. Are there any recommended layout considerations when using SMF18A-HM3-18?

    • It is recommended to minimize trace lengths and provide a low impedance path to the ground plane for optimal performance.