Metal Oxide Varistor 20D112K MOV
The Metal Oxide Varistor 20D112K is a disk-type surge-protection component engineered to clamp transient over-voltages and absorb large impulse energy. Built on a zinc-oxide ceramic element in a compact 20 mm disk package, the device is intended to react quickly to spikes on AC or DC lines and divert harmful surge energy away from sensitive circuitry.
Mechanically robust, the 20D112K features radial leads and epoxy resin coating rated to UL94 V-0 for flame retardancy, making it suitable for board-level installation in appliances and industrial equipment. Its construction balances high energy absorption with a low clamping ratio so that when a transient occurs the varistor limits the voltage to a safer level without sustaining excessive follow-on current.
The datasheet highlights the part’s suitability where repeated impulse endurance and predictable clamping behaviour are required; production testing and soldering recommendations are provided to ensure reliability in assembly. Typical uses include protecting semiconductors, relays and consumer-electronics power inputs from surge events while meeting recognized safety approvals.
Features:
- Wide operating voltage range (series covers 18 V to 1800 V).
- Fast response to transient over-voltage.
- Large transient energy absorption capability.
- Low clamping ratio and no following-on current.
- Epoxy resin coating flame-retardant to UL94 V-0.
- Meets MSL Level 1 per J-STD-020.
- Operating temperature range specified (robust for typical environments).
- Safety certifications: UL/cUL and TÜV.
Specifications:
| Property | Value |
|---|---|
| Part number: | 20D112K |
| Varistor voltage V₁mA (V): | 1100 (990–1210) |
| Maximum allowable AC (VAC): | 680 V |
| Maximum allowable DC (VDC): | 895 V |
| Max. energy (10/1000 µs): | 391 J |
| Withstanding surge current / test (8/20 µs): | 100 A (as listed in table) |
| Max. clamping voltage (8/20 µs) VC: | 1815 V |
| Withstanding surge (numeric column shown): | 6500 (value shown in table) |
| Rated power (W): | 1.0 W (table column) |
| Typical capacitance (@1 kHz): | 450 pF (reference) |
| Operating temperature: | −40 °C to +105 °C (series spec) |
| Coating: | Epoxy resin, UL94 V-0 |
| Dimensions (D / H): | See datasheet dimensions table (D: 20.0–23.0 mm; H: 20.5–26.0 mm) |
Pinout Diagram:
Footprint Diagram:
Applications:
- Surge protection in electronic home appliances.
- Surge protection in industrial electronics.
- Surge protection in consumer electronics.
- Protection of transistors, diodes, ICs, thyristors and triacs.
- Relay and electromagnetic-valve surge absorption.
Package Contents:
- 1x Metal Oxide Varistor 20D112K MOV
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