251PMLF

Overview

Category: Electronic Component
Use: Circuit Protection
Characteristics: High Voltage Varistor
Package: PMLF Package
Essence: Metal Oxide Varistor (MOV)
Packaging/Quantity: Bulk Packaging, Quantity Varies

Specifications and Parameters

• Maximum Continuous Voltage Rating: 250Vrms
• Maximum Clamping Voltage: 395V
• Peak Current (8/20μs): 6.5kA
• Energy (10/1000μs): 1.2J
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The 251PMLF varistor has a detailed and complete pin configuration as follows:

1. Pin 1: Anode Terminal
2. Pin 2: Cathode Terminal

Functional Characteristics

• Provides overvoltage protection by clamping excessive voltage levels.
• Absorbs and dissipates high energy surges to protect sensitive electronic components.
• Fast response time ensures quick protection against voltage spikes.
• Stable and reliable performance in a wide range of operating conditions.

Advantages and Disadvantages

Advantages: - High voltage rating for effective protection against overvoltage events. - Compact PMLF package for easy integration into circuit designs. - Wide operating temperature range allows for versatile applications. - Reliable performance with low leakage current.

Disadvantages: - Limited maximum continuous voltage rating compared to some other varistors. - Requires proper circuit design and placement for optimal performance.

Applicable Range of Products

The 251PMLF varistor is commonly used in various electronic devices and systems that require overvoltage protection, including:

• Power supplies
• Industrial equipment
• Telecommunications devices
• Automotive electronics
• Consumer electronics

Working Principles

The 251PMLF varistor is based on the working principle of a Metal Oxide Varistor (MOV). It consists of a ceramic body made of zinc oxide grains with added dopants. Under normal operating conditions, the varistor exhibits high resistance. However, when subjected to excessive voltage levels, the varistor's resistance decreases significantly, allowing it to divert the excess current and protect the connected circuitry.

Detailed Application Field Plans

The 251PMLF varistor can be applied in various fields, including:

1. Power Supply Protection: Install the varistor across the input terminals of power supplies to safeguard against voltage surges.
2. Motor Control Systems: Use the varistor to protect motor control circuits from voltage transients.
3. Communication Equipment: Incorporate the varistor in communication devices to prevent damage caused by lightning strikes or power fluctuations.
4. Automotive Electronics: Employ the varistor in automotive systems to shield sensitive components from voltage spikes.
5. Industrial Automation: Integrate the varistor into industrial automation systems for reliable overvoltage protection.

Detailed Alternative Models

Some alternative models similar to the 251PMLF varistor include:

• 471PMLF
• 681PMLF
• 821PMLF
• 102PMLF
• 121PMLF

5 Common Technical Questions and Answers

1. Q: What is the maximum continuous voltage rating of the 251PMLF varistor? A: The maximum continuous voltage rating is 250Vrms.

2. Q: What is the clamping voltage of the 251PMLF varistor? A: The clamping voltage is 395V.

3. Q: Can the 251PMLF varistor handle high energy surges? A: Yes, it can handle peak currents up to 6.5kA and energy levels of 1.2J.

4. Q: What is the operating temperature range of the 251PMLF varistor? A: The varistor can operate within a temperature range of -40°C to +85°C.

5. Q: What is the package type for the 251PMLF varistor? A: It is available in a PMLF package.

This encyclopedia entry provides an overview of the 251PMLF varistor, including its basic information, specifications, pin configuration, functional characteristics, advantages and disadvantages, applicable range of products, working principles, detailed application field plans, alternative models, and common technical questions and answers.