07D470K 47V Zinc Oxide Varistor ZOV COM23

DescriptionPower grids and inductive loads are notoriously noisy. When you are designing custom power supplies for ESP32 dashboards or safeguarding the inputs of sensitive hardware, you need reliable overvoltage protection. The 07D470K Varistor is an essential, low-cost insurance policy for your electronics.How it Works (The Electrical Pressure Valve)Think of a Metal Oxide Varistor (MOV) as a pressure-relief valve for electricity. Under normal operating conditions, its resistance is extremely high, meaning it acts almost like an open circuit and draws near-zero current.However, if a sudden voltage transient hits the circuit—like a spike from a switching relay, a nearby lightning strike, or an unstable wall adapter—and exceeds its rated 47V, the varistor’s resistance drops to near zero in nanoseconds. This instantly creates a short circuit, shunting the dangerous high-voltage surge safely back to ground and away from your delicate components.The “Sacrificial” ComponentMOVs are designed to degrade slightly every time they absorb a massive surge. In the event of a truly catastrophic power spike, the varistor is designed to purposefully blow itself up to save the rest of your board. Hardware Pro-Tip: For optimal safety, it is highly recommended to pair this varistor with a series fuse on your power line. When the MOV clamps down hard to short a massive surge, the resulting current rush will pop the fuse, safely cutting power to the entire device.Key Features:Fast Response Time: Reacts to voltage transients in less than 25 nanoseconds, catching spikes before they can damage silicon chips.Compact Footprint: The small 7mm disc size fits easily into dense custom PCBs, tight project enclosures, and standard breadboards.High Surge Capability: Despite its small size, it is capable of absorbing significant energy hits to keep your power rails stable.Technical Specifications:Part Number: 07D470KVaristor Voltage: 47V (Allowed range: 42.3V to 51.7V)Maximum Allowable AC Voltage: 30V AC (RMS)Maximum Allowable DC Voltage: 38V DCDisc Diameter: 7mmLead Spacing: ~5mmTolerance: ±10%Operating Temperature: -40°C to 85°CIdeal Applications:Surge protection for low-voltage custom DC power suppliesProtecting IoT sensor nodes from noisy industrial or automotive power railsSuppressing inductive kickback from mechanical relays and small motorsGeneral-purpose transient voltage suppression in embedded hardware designsDatasheet