B72220S0421K551 Circuit Protection

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Transient voltage suppressors (TVSs) and metal oxide varistors (MOVs) are electrical components that protect circuits and systems from transient voltage surges. The B72220S0421K551 is a type of TVS, specifically a two-terminal integrated TVS diode that is designed for use in AC/DC circuits providing reliable over voltage protection. It is typically used in power supplies, computer peripherals, and other electronic systems.

Application Field

The B72220S0421K551 is designed for use in AC/DC circuits with a maximum peak pulse power of 1.5 kW. It has a nominal overvoltage protection voltage of 42 V with a maximum clamping voltage of 56 V. It is also designed to meet IEC 61000-4-5 requirements for surge protection, allowing it to be used for lightning immunity applications. The TVS diode has an axial lead and is rated for an operating temperature range of -40°C to +125°C. It also meets RoHS and REACH requirements for environmental safety.

Working Principle

The B72220S0421K551 is a two-terminal integrated TVS diode that is designed to protect AC/DC circuits from transient voltage surges. It has a reverse breakdown voltage of 42 V with a transient peak voltage of up to 56 V. When used in an AC/DC circuit, it acts as a switch that will quickly cut off the power if it is exposed to a high voltage surge. This prevents the power going into the circuit from exceeding the maximum voltage threshold, which could cause damage to the circuit and its components.

The TVS diode works by clamping the voltage and limiting the rise time. When exposed to a voltage surge, the voltage across the diode rapidly rises to a peak value, then quickly drops to the normal operating voltage. The diode dissipates the extra energy as heat, which is why it has an excellent power dissipation capability. This makes it ideal for use in power supplies and other circuits where the power consumption is high.

The B72220S0421K551 also works as a mild dampener to reduce harmonic distortion. When exposed to a surge, the diode will absorb some of the energy and tame the current, keeping the harmonics to a minimum. This feature makes it a good choice for audio and video applications where even minimal amounts of distortion can be unpleasant.

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