Varistor V20K300-5 Datasheet PDF learn more.
Functions: 20mm, 300Vac, 405Vdc, Metal Oxide Varistor.
Package information: Disk type
Manufacturer: ITG
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Description
V20K300-5 is a 20mm radial lead Metal Oxide Varistor (MOV) designed for 300Vac continuous operation and 405Vdc rating, providing robust transient voltage suppression. It offers high surge current capability, fast response time, and stable clamping characteristics for overvoltage protection. This device is commonly used in power supplies, industrial equipment, home appliances, and surge protection circuits.
Features
- Rated for 300Vac and 405Vdc operation
- 20mm disc size for high energy absorption
- Fast response to transient overvoltage events
- High surge current handling capability
- Excellent clamping performance
- Stable characteristics over wide temperature range
- RoHS compliant and lead-free construction
Specification
Absolute Maximum Ratings (Tc = 25 °C)
| Parameter | Symbol | Value | Unit |
| Maximum Continuous AC Voltage | VAC | 300 | Vac |
| Maximum Continuous DC Voltage | VDC | 405 | Vdc |
| Varistor Voltage | VV | ~470 | V |
| Clamping Voltage | VC | ~775 | V |
| Peak Surge Current (8/20µs) | Imax | 6500 | A |
| Energy Absorption | Wmax | ~140 | J |
| Operating Temperature | Top | -40 to +85 | °C |
Design Notes
- Place the MOV across the AC line input for effective surge suppression
- Ensure adequate spacing and creepage distance in high-voltage designs
- Consider thermal protection such as a fuse or thermal cutoff in series
- De-rating is recommended for long-term reliability under repetitive surges
- Avoid operation near maximum ratings for extended durations
Typical Circuit Usage
- AC mains surge protection across line and neutral
- Input protection stage in SMPS designs
- Transient suppression in industrial control systems
- Protection for relay contacts and switching elements
- Used alongside fuses and NTC thermistors in power entry modules
How to Choose This Part
- Select based on maximum AC/DC operating voltage margin
- Verify clamping voltage is suitable for downstream circuitry
- Check surge current rating against expected transient levels
- Ensure energy rating meets worst-case surge conditions
- Consider physical size constraints and thermal environment
Applications
- Power supplies and adapters
- Household electrical appliances
- Industrial automation equipment
- Telecommunication power systems
- Lighting and ballast circuits
Alternative / Equivalent Products
- EPCOS B72220S0301K101
- Littelfuse V20E300P
- TDK S20K300
- Panasonic ERZ-V20D301
- Bourns MOV-20D301K
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V20K300-5 PDF File
