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20D101 Datasheet – 100V, Metal Oxide Varistor ( PDF )

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20D101 is a 20 mm radial leaded metal oxide varistor (MOV) from the MOV-20DxxxK series, designed for robust overvoltage transient suppression.

Function: 20mm, 100V, Metal Oxide Varistor

Package: Disk Type

Manufacturer: Bourns, Inc

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Varistor 20D101 datasheet

Description

The MOV-20D101 Series of 20 mm radial leaded varistor devices protects against overvoltage transients such as lightning, power contact and power induction.

The metal oxide varistors offer a choice of varistor voltages from 18 V to 1800 V and Vrms voltages from 11 V to 1100 V. The devices have a high current handling, high energy absorption capability and fast response times to protect against transient faults up to rated limits.

It provides bidirectional protection against high-energy surges such as lightning strikes, switching transients, and inductive load disturbances. With high surge current capability and fast response time, it is commonly used in power line protection circuits.

Features

  • Nominal varistor voltage: ~100 V (code “101”)
  • Large 20 mm disc for high energy absorption
  • High surge current handling capability
  • Fast response time (nanosecond range)
  • Bidirectional clamping characteristics
  • Wide voltage range across series (18 V to 1800 V)
  • Suitable for AC and DC transient suppression

Functional Description

  • Acts as a voltage-dependent resistor: high resistance at normal voltage, low resistance during overvoltage
  • Clamps transient voltages by rapidly conducting surge current
  • Returns to high impedance after transient event

Design Notes

  • Select MOV voltage rating above normal operating voltage to avoid premature conduction
  • Use in conjunction with fuses or thermal protection to prevent failure under sustained overvoltage
  • Place close to input power lines for optimal surge suppression
  • Consider degradation over repeated surge events (aging effect)
  • Ensure proper spacing and insulation for high-energy applications

Typical Applications

  • AC/DC power line surge protection
  • Switching power supplies
  • Industrial equipment protection
  • Consumer electronics (TVs, appliances)
  • Motor drives and relay circuits

How to Choose This Part

  • Select based on working voltage (AC/DC) and required clamping level
  • Choose disc size (20 mm here) based on surge energy requirements
  • Ensure surge current rating matches expected transient levels
  • Consider environmental and reliability requirements

Alternative / Equivalent Products

  • 14D101 (smaller size, lower energy)
  • 20D151 (higher voltage variant)
  • S14K100 (EPCOS equivalent)
  • V20E100 (Littelfuse equivalent)

Other data sheets are available within the file: 20D102, 20D112, 20D121, 20D151

20D101 Datasheet PDF Download


20D101 pdf

MP3401A PDF Datasheet – 30V, 3A, P-Ch, MOSFET

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Part Number: MP3401A

Function: -30V, -3A, P-Channel Enhancement Mode MOSFET

Package: SOT-23 Type

Manufacturer: Major Power

Images:MP3401A pdf pinout

Description

MP3401A is 30V, 3A, P-Channel Enhancement Mode MOSFET. This is a type of field-effect transistor with P-channel conductivity. This means it uses positively charged carriers (holes) to conduct electrical current.

1. P-Channel Conductivity: In a P-channel MOSFET, the channel between the source and drain is formed within a P-type semiconductor material. When a positive voltage is applied to the gate terminal relative to the source terminal, it creates an electric field that attracts positively charged holes to the surface, allowing current to flow from the source to the drain.

2. Enhancement-Mode Operation: P-channel Enhancement-Mode MOSFETs are normally off devices. This means that when there is no voltage applied to the gate terminal (V_GS = 0V), the transistor is in its off state, and very little current flows between the source and drain. To turn the MOSFET on, a positive voltage (V_GS > 0V) is applied to the gate terminal.

Features

• -30V/-3A,

(1) RDS(ON)=46mΩ (typ.) @ VGS=-10V

(2) RDS(ON)=55mΩ (typ.) @ VGS=-4.5V

(3) RDS(ON)=79mΩ (typ.) @ VGS=-2.5V

• Super High Dense Cell Design

• Reliable and Rugged

• Enhance ESD Cell Protection

• Lead Free and Green Devices Available (RoHS Compliant

 

MP3401A datasheet

Absolute Maximum Ratings (Ta = 25°C)

1. Drain to source voltage: VDSS = – 30 V

2. Gate to source voltage: VGSS = ± 10 V

3. Drain current: ID = – 3

4. Maximum Power Dissipation: Pd = 0.83 W

5. Channel temperature: Tch = 150 °C

6. Storage temperature: Tstg = -55 to +150 °C

Applications

1. Power Management in LCD TV,  Monitor, Note book Computer

2. Portable Equipment and Battery, Powered Systems

MP3401A PDF Datasheet

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