STMicroelectronics
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SM4T21AY
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SM4T21AY Product Overview

Introduction

The SM4T21AY is a transient voltage suppressor (TVS) diode belonging to the category of electronic components used for protecting sensitive electronics from voltage spikes and transients. This entry provides an in-depth overview of the SM4T21AY, including its basic information, specifications, pin configuration, functional features, advantages and disadvantages, working principles, application field plans, and alternative models.

Basic Information Overview

  • Category: Electronic Components
  • Use: Protection against voltage spikes and transients
  • Characteristics: High surge capability, low clamping voltage, fast response time
  • Package: SMA package
  • Essence: Transient voltage suppression
  • Packaging/Quantity: Available in tape and reel packaging, quantity varies by supplier

Specifications

  • Peak Pulse Power: 400W
  • Standoff Voltage: 21V
  • Breakdown Voltage Range: 23.4V to 26V
  • Operating Temperature Range: -55°C to +150°C
  • Storage Temperature Range: -55°C to +150°C

Detailed Pin Configuration

The SM4T21AY TVS diode has a standard SMA package with two pins. Pin 1 is the cathode, and pin 2 is the anode.

Functional Features

  • Transient Voltage Suppression: Provides protection against voltage surges and transients.
  • Fast Response Time: Reacts quickly to voltage spikes, diverting excess current away from sensitive components.
  • Low Clamping Voltage: Limits the voltage across the protected circuit during transient events.

Advantages and Disadvantages

Advantages

  • Effective protection against voltage transients
  • Fast response time
  • Low clamping voltage

Disadvantages

  • Limited peak pulse power compared to some higher-rated TVS diodes
  • Requires careful consideration of placement and routing for optimal performance

Working Principles

The SM4T21AY operates based on the principle of avalanche breakdown. When a voltage transient occurs, the diode rapidly conducts excess current to ground, preventing it from reaching sensitive components.

Detailed Application Field Plans

The SM4T21AY is commonly used in various applications, including: - Consumer electronics - Automotive electronics - Industrial control systems - Telecommunications equipment - Power supplies

Detailed and Complete Alternative Models

  • SM4T18AY: Lower standoff voltage variant
  • SM4T24AY: Higher standoff voltage variant
  • SM6T Series: Higher peak pulse power options

In conclusion, the SM4T21AY TVS diode offers effective transient voltage suppression for a wide range of electronic applications. Its fast response time and low clamping voltage make it a valuable component for protecting sensitive electronics from voltage spikes and transients.

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10 سوال و پاسخ رایج مربوط به کاربرد SM4T21AY در راه حل های فنی را فهرست کنید

  1. What is SM4T21AY?

    • SM4T21AY is a specialized diode designed for transient voltage suppression in electronic circuits.

  2. How does SM4T21AY protect electronic circuits?

    • SM4T21AY suppresses transient voltage spikes by diverting excess current away from sensitive components, thus safeguarding the circuit.

  3. What are the key features of SM4T21AY?

    • SM4T21AY offers low clamping voltage, high surge capability, and fast response time, making it ideal for protecting sensitive electronics.

  4. In what applications can SM4T21AY be used?

    • SM4T21AY is commonly used in power supplies, automotive electronics, industrial equipment, and telecommunications systems to protect against voltage transients.

  5. What is the maximum peak pulse current of SM4T21AY?

    • The maximum peak pulse current of SM4T21AY is typically around 400 watts.

  6. How should SM4T21AY be installed in a circuit?

    • SM4T21AY should be placed in parallel with the protected load, ensuring that it can quickly respond to any voltage spikes.

  7. What is the operating temperature range of SM4T21AY?

    • SM4T21AY is designed to operate within a temperature range of -55°C to 150°C, making it suitable for various environments.

  8. Can SM4T21AY be used for both AC and DC circuits?

    • Yes, SM4T21AY is suitable for both AC and DC circuits, providing versatile protection against transient voltages.

  9. Are there any precautions to consider when using SM4T21AY?

    • It's important to ensure proper heat dissipation and avoid exceeding the maximum ratings to maintain the effectiveness of SM4T21AY.

  10. Where can I purchase SM4T21AY for my technical solutions?

    • SM4T21AY can be purchased from authorized distributors or directly from manufacturers specializing in electronic components.