SMP22A-M3/84A

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The SMP22A-M3/84A series from Littelfuse is a part of their TVS diode family, designed to protect sensitive electronics from voltage transients due to lightning, power cross, switching transients, and inductive switching. It can offer working as bidirectional protection.

The SMP22A-M3/84A is a dual channel solution to protect the event that occur on the line side. This is useful for applications in which transients from both directions need to be eliminated. These parts come in a compact package, significantly reducing PCB space.

Application Field

The SMP22A-M3/84A series is ideal for surge protection in sensitive electronic equipment, infrastructures, and applications such as solar PV systems, power distribution systems, telecom equipment, power supplies, industrial controllers, automotive, and medical devices. This device provides suppressing transient voltages on both lines, and is designed to protect components such as Thyristors (in AC-DC converters) and IGBTs from indirect lightning and power cross.

Working Principle

The SMP22A-M3/84A works as a voltage-dependent bidirectional transient voltage suppressor device. This device includes two identical diodes configured in a 5-pin package. Each diode is capable of providing up to 19 amps protection current, and peak pulse power up to 2450W. When the input voltage exceeds the breakdown voltage, the diode turns on and the voltage is limited to the device\'s clamping voltage. Then, the device starts to conduct current, dissipating the voltage transient, until the protection voltage returns to its normal level.

The SMP22A-M3/84A series has a breakdown voltage of 15V and a clamping voltage of 21-29V. Its fast response time is below 1ns, making it suitable for use in AC/DC applications. In addition, the device can withstand repetitive surge while sustaining no current leakage. The maximum working temperature should not exceed 125°C.

Conclusion

The SMP22A-M3/84A is a perfect solution for power distribution systems, telecom equipment, and other applications which require bidirectional protection from transients. It is a compact device, which is capable of handling up to 19 amps of surge current, and peak pulse power up to 2450W. In addition, the fast response time of less than 1ns makes it suitable for use in AC/DC applications.

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