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MOV vs. Diode Characteristics

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MOV vs. DIODE Characteristics

Characteristics MOV Diode
Energy Higher Lower
Clamping Higher Lower
Polarity Bipolar only Unipolar & Bipolar
Capacitance 1 to 4nF 100pF to 3nF
Standoff Voltage Medium to High Low to Medium
Leakage Current Higher Lower
Screening Limited Extensive JAN TX/TXV/S
Cost Lower Higher

Attributes of Popular Transient Voltage Suppression MOV & Diode

Advantages * Typically fail as an open circuit * Wide Range of Breakdown Voltages * Fast response time (<1ns) * Low clamping Voltage
Disadvantages * Inherent bipolar clamping * Single layer MOV have limited life * Limited power capability * Typically fail as an short circuit * Power rating decreases with temperature
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