MOV-14D821K

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TVS – Varistors, MOVs are one of the well-known, widely used surge protection devices. MOV-14D821K is a general purpose high voltage varistor device manufactured by Littelfuse. This device is designed for both EFT (electrical fast transients) and surge protection.

The MOV-14D821K is a two-terminal AC suppressor in axial lead package with a symmetrical clamping voltage of specific test waveform with high current rating, 1500A (8/20µs) of peak impulse current. The midpoint of MOV-14D821K’s clamping voltage is typically 14V at 8/20µs and approximately 21V at 10/160µs.

MOV-14D821K application field and working principle

MOV-14D821K is commonly used in HVAC (Heating, ventilation and air conditioning) controllers, computer peripherals, and telecom equipment. The MOV-14D821K exceeds the requirements of most international regulatory standards including UL1449, EN/IEC 61643-11, and CSA 22.2 No. 235, making it suitable for a variety of applications.

MOV-14D821K typically protects circuits from low-energy transient events caused by ESD (electrostatic discharge) and EFT (electrical fast transients), as well as higher-energy surge pulses. However, MOV-14D821K can only protect against relatively low-energy transients such as lightning strike, direct strikes, and nearby lightning.

MOVs work on the principle of avalanche breakdown. An avalanche breakdown occurs when a high voltage is applied to a semiconductor material, such as a film varistor, and a substantial current begins to flow through the material as ions are accelerated by the voltage and collide with other ions, resulting in the generation of more carriers (electrons and holes). As the electric field increases, the avalanche current increases exponentially until the voltage is limited by the material\'s breakdown voltage. The MOV-14D821K provides an effective clamping of voltage surges and is highly effective at attenuating unwanted fast transients.

The MOV-14D821K also offers excellent thermal stability and a stable current rating. The device is designed to withstand a wide temperature range from -40°C to 125°C and can handle operating temperatures up to 250°C, making it well suited for extreme environmental conditions.

Overall, the MOV-14D821K is an effective nonlinear voltage suppressor that provides reliable performance and protection for a wide variety of applications. It is an ideal choice for applications that require a high level of protection from transients.

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