Metal Oxide Varistor 7D391K MOV
Fundamental Operating Principle
The 07D391K is a voltage-dependent, nonlinear semiconductor component. Its primary function is to protect sensitive electronic circuits by acting as a high-impedance shunt under normal operating conditions. However, when a transient over-voltage event occurs and exceeds its specific threshold, the varistor instantly switches to a state of very low impedance.
Composition and Construction
This device is a multilayer structure composed primarily of zinc oxide (ZnO) grains mixed with other metal oxides, forming the bulk of the ceramic element. These grains create a network of semiconductor junctions, which are responsible for the component’s unique current-voltage characteristics. The entire element is encased in a robust, flame-retardant epoxy resin coating, ensuring mechanical integrity and electrical isolation.
Key Protective Function
The critical action of the 07D391K is to clamp transient voltages to a safe, predetermined level, thereby diverting the potentially damaging surge current away from vulnerable components. By absorbing and dissipating the energy from voltage spikes as heat, it effectively limits the voltage across its terminals to a maximum clamping value, ensuring the downstream circuitry remains within its safe operating voltage range.
Features:
- Fast response to transient over-voltage events.
- Large transient energy absorption capability.
- Low clamping ratio for effective voltage limitation.
- No follow-on current after the surge subsides.
- Flame-retardant epoxy resin coating (UL94 V-0).
- Meets Moisture Sensitivity Level (MSL) 1.
- Safety certifications from UL, CUL, and TÜV.
Specifications:
| Parameter | Specification | Conditions |
|---|---|---|
| Part Number: | 07D391K | |
| Varistor Voltage: | 390V | At 1mA DC |
| Voltage Tolerance: | ±10% | 351V – 429V |
| Max. Allowable Voltage (AC): | 250V | RMS |
| Max. Allowable Voltage (DC): | 320V | |
| Max. Clamping Voltage: | 650V | At 10A, 8/20µs pulse |
| Max. Energy (10/1000µs): | 26 Joules | |
| Withstanding Surge Current: | 1200A | 8/20µs pulse, 1 time |
| Rated Power: | 0.25 W | |
| Typical Capacitance: | 105 pF | @ 1kHz |
Pinout Diagram:
Footprint Diagram:
Applications:
- Surge Protection in Electronic Home Appliances.
- Surge Protection in Gas and Petroleum Appliances.
- Surge Protection in Industrial Electronics.
- Surge Protection in Consumer Electronics.
- Transistor, Diode, and IC Semiconductor Protection.
- Thyristor or Triac Semiconductor Protection.
- Relay and Electromagnetic Valve Surge Absorption.
Package Contents:
- 1x Metal Oxide Varistor 7D391K MOV
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