B72214S2321K551 Circuit Protection

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TVS - Varistors, MOVs

B72214S2321K551 is a member of Transient Voltage Suppressor (TVS) family of devices from electronics firm Bourns. It is a bi-directional device, with a peak power dissipation of up to 2.5W. This device is designed to protect circuits against electrostatic discharges (ESD) during switching situations. It is often used as an alternative to Transient Voltage Suppressor Diodes (TVSDs), which protect against high-energy transients from external sources.

Application Field

B72214S2321K551 protects against overvoltage events across a range of applications. These include, but are not restricted to, cellular phones, computers, LCD panels, motherboards, external sensors, LED applications and automotive electronics. This device was designed to meet the highest industry standards and can be used for applications requiring ESD protection up to the 8kV contact and 15kV air-gap according to the EN 61000-4-2 standard.

Working Principle

When a voltage or current transient occurs on a connected line, the B72214S2321K551 will conduct current in both directions across its unit. This will limit the voltage level to below the defined breakdown point. To ensure the device is reliable and efficient, it is equipped with an internal shunt resistance. In the absence of a transient, the device will not conduct any current and remain in a non-conducting state. The internal resistance of the device can be adjusted by varying the size of the area exposed to the external voltage.

The device also includes a protection diode which will be activated when the peak reverse voltage is hit. This ensures the circuit remains protected even after a overvoltage event has passed. Additionally, this protection diode will work in conjunction with the shunt resistance to absorb some of the surge energy and discharge it via the line.

The B72214S2321K551 is also designed to have high surge durability. When a transient passes through the unit, the internal shunt resistance absorbs some of the energy which will dissipate in the form of heat. By keeping the exposed area small, the device is able to dissipate large amounts of power without overheating or damaging the circuit. This ensures the device provides a reliable protection against overvoltage events.

In summary, the B72214S2321K551 is an advanced protection device from Bourns. It is designed for use in a range of applications to protect against overvoltage events. This device includes an internal shunt resistance which will conduct and absorb current when a voltage or current transient occurs, as well as a protection diode which will ensure the circuit remains protected even after a transient has passed. Additionally, the B72214S2321K551 is designed to have high surge durability, ensuring its reliable protection against overvoltage events.

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