SMD MOV means a surface-mount metal-oxide varistor. It is a broad product description that may include a multilayer varistor (MLV), a molded high-energy surface-mount MOV or another MOV construction designed for automated printed circuit board assembly.
This page is the component hub for SMD MOV constructions, ratings, applications and selection resources. For a detailed introduction, read What Is an SMD MOV?.
Overview
All SMD MOVs share voltage-dependent, bidirectional behavior, but their internal structures and energy classes can be very different. Small multilayer chips are commonly used for board-level ESD and transient protection. Larger molded products may be intended for higher continuous voltages and power-input surge events.
The label “SMD MOV” does not by itself prove package size, capacitance, surge capability or suitability for an alternating-current (AC) line. Always identify the construction and review the complete datasheet.
Main Advantages
- Surface-mount assembly and compatibility with automated production
- Bidirectional response for positive and negative transients
- Options ranging from compact MLVs to molded higher-energy devices
- Short protection paths when placed near a connector or power input
- Broad choice of voltage, capacitance and package classes
Typical Applications
- Connector, keypad and exposed-interface ESD protection
- Low-voltage power and control rails
- Automotive electronic modules with series-specific qualification
- Industrial control and communication equipment
- Light-emitting diode (LED) lighting controls and auxiliary supplies
- Power inputs when a suitable high-voltage, high-energy SMD MOV is specified
Specifications to Compare
Compare maximum continuous AC or direct-current (DC) voltage, varistor voltage and test current, clamping voltage and pulse current, peak surge current, energy, repetitive-pulse endurance, capacitance, leakage and temperature derating. Also verify body dimensions, land pattern, terminal geometry, reflow compatibility and qualification.
For signal interfaces, capacitance and signal-integrity effects may be the limiting factor. For power inputs, voltage margin, surge waveform, energy, fault coordination and thermal behavior normally dominate.
Series and Model Selection
First decide whether the application needs a compact multilayer chip, a molded high-energy device or a specialized low-capacitance protector. Then match the normal operating voltage and transient environment before comparing package-compatible models.
For private selection support, provide the original part number or target ratings, normal voltage, transient waveform, maximum allowable clamping voltage, package, assembly process and qualification requirement through Ask UBAEC.
Downloads
Series datasheets, package drawings and application notes will be added after technical verification. The manufacturer’s current datasheet remains the final reference for design approval.