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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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
