Littelfuse Inc.
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V250LA40B
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V250LA40B

Product Overview

Category

The V250LA40B belongs to the category of metal oxide varistors (MOV).

Use

It is used for transient voltage suppression in various electronic and electrical systems.

Characteristics

  • High energy absorption capacity
  • Fast response time
  • Wide operating voltage range
  • Reliable performance

Package

The V250LA40B is typically available in a disc-shaped package with leads for easy installation on circuit boards or within electrical enclosures.

Essence

The essence of the V250LA40B lies in its ability to protect sensitive electronic components from voltage surges and transients.

Packaging/Quantity

It is commonly packaged in reels, tubes, or trays, and the quantity per package varies based on the supplier and customer requirements.

Specifications

  • Maximum Allowable Voltage: 250V
  • Peak Current Capability: 4000A
  • Energy Absorption: 250J
  • Operating Temperature Range: -40°C to 85°C
  • Lead Material: Tin-plated copper

Detailed Pin Configuration

The V250LA40B typically has two leads for connection to the circuit. The pin configuration is as follows: - Pin 1: Anode - Pin 2: Cathode

Functional Features

  • Clamping of transient overvoltages
  • Dissipation of surge energy
  • Protection of downstream components
  • Fast response to voltage spikes

Advantages

  • Effective protection against voltage transients
  • Wide operating temperature range
  • High energy absorption capability
  • Compact and easy to integrate into circuits

Disadvantages

  • Limited lifespan after repeated exposure to high-energy transients
  • Requires replacement after significant surge events

Working Principles

The V250LA40B operates based on the principle of nonlinear resistance, where it exhibits a high resistance at normal operating voltages and rapidly decreases in resistance when subjected to overvoltage conditions. This allows it to divert excess current away from sensitive components, thereby protecting them from damage.

Detailed Application Field Plans

The V250LA40B is widely used in various applications, including: - Power supply units - Telecommunication equipment - Industrial control systems - Consumer electronics - Automotive electronics

Detailed and Complete Alternative Models

Some alternative models to the V250LA40B include: - V275LA20AP - V320LA40BP - V385LA40BP - V420LA40BP

In conclusion, the V250LA40B is a crucial component in safeguarding electronic and electrical systems from transient voltage events. Its robust characteristics and wide-ranging applications make it an essential part of modern electronic designs.

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Перелічіть 10 типових запитань і відповідей, пов’язаних із застосуванням V250LA40B у технічних рішеннях

  1. What is the V250LA40B?

    • The V250LA40B is a metal oxide varistor (MOV) designed for overvoltage protection in various electronic and electrical systems.

  2. What are the key specifications of the V250LA40B?

    • The V250LA40B has a maximum continuous voltage rating of 250V, a peak current capability of 6500A, and a maximum energy rating of 100J.

  3. Where can the V250LA40B be used?

    • The V250LA40B can be used in applications such as surge protectors, power supplies, industrial equipment, and telecommunications systems to protect against transient voltage spikes.

  4. How does the V250LA40B provide overvoltage protection?

    • The V250LA40B operates by clamping excessive voltage levels and diverting surge currents away from sensitive components, thereby safeguarding the connected equipment.

  5. What are the typical failure modes of the V250LA40B?

    • The V250LA40B can fail due to prolonged exposure to overvoltage conditions, excessive current surges, or thermal stress. It is important to monitor and replace MOVs if they have been subjected to significant stress.

  6. Are there any precautions to consider when using the V250LA40B?

    • Users should ensure proper mounting and grounding of the V250LA40B to maximize its effectiveness. Additionally, it's important to adhere to the manufacturer's recommended operating conditions.

  7. Can the V250LA40B be used in outdoor applications?

    • Yes, the V250LA40B is suitable for outdoor use, but it should be housed in an appropriate enclosure to protect it from environmental factors such as moisture and temperature extremes.

  8. What is the expected lifespan of the V250LA40B?

    • The V250LA40B has a long operational life under normal operating conditions, but its lifespan can be reduced if it experiences frequent overvoltage events or high-energy transients.

  9. Is the V250LA40B RoHS compliant?

    • Yes, the V250LA40B complies with the Restriction of Hazardous Substances (RoHS) directive, making it suitable for use in environmentally conscious applications.

  10. Where can I find detailed application notes for the V250LA40B?

    • Detailed application notes for the V250LA40B can be found in the product datasheet provided by the manufacturer, which includes information on circuit design, installation guidelines, and performance characteristics.