V421HA40

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Varistors, MOVs (Metal Oxide Varistors), and TVS (Transient Voltage Suppressors) are electronic devices used to protect circuit components from electrical transients, such as lightning strikes or power outages. The V421HA40 is a particular type of TVS designed for use in applications where it provides protection against transient voltage spikes. In this article, we\'ll explore the application field and working principle of the V421HA40.

The V421HA40 is a low-capacitance TVS designed for use in medical environments. It\'s able to protect delicate electronics from electrostatic discharge (ESD) and other transients. The device is designed to protect components such as medical instruments, printers, and other portable electronics from damage caused by electrical transients. It\'s also suitable for use as a common-mode choke.

The V421HA40 is a unidirectional device, meaning it only allows current to flow in one direction.This provides level C static protection as defined by the IEC 61000-4-2 standard. It can also handle higher surge currents, up to 20A peak (measured at 8/20µs) and is capable of handling up to 35A of DC standby current. The device is rated to withstand up to 600V of peak voltage and has a maximum leakage current of 1µA.

The V421HA40 works by limiting the current through it when a transient event occurs. This limits the amount of energy the transient can pass through by filtering out most of the higher frequency components. This reduces the chance of damage to the device or component it is protecting.

The V421HA40 is typically used in series with the circuit, as in the diagram below. This allows the device to absorb the surge current and divert it away from the circuit. The device\'s capacitance plays a key role here, as it is effectively a low-pass filter, and so helps to reduce the amount of noise passing through the circuit.

In sum, the V421HA40 is a unidirectional TVS designed for use in medical environments. It is capable of providing up to 600V of peak voltage protection and can handle peak currents of up to 20A (measured at 8/20µs). The device’s low-capacitance helps to reduce transient noise passing through the circuit. The V421HA40 is typically used in series with the circuit it is intended to protect.

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