SMOV25S301MP

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TVS (transient voltage suppressor) and varistor (VARiable resIStorer) are two passive components including MOV (metal oxide varistor) that protect the electronic circuit from the transient surge voltages. To provide information of MOV, this article focuses on SMOV25S301MP application field and working principle.

SMOV25S301MP application field

SMOV25S301MP is a MOV series from Littelfuse which belongs to SMOV family. It offers low clipping levels and compact sub-miniature surface mount packages for circuit protection applications. Compared to the larger MOVs, it has higher working voltage and lower power dissipation, thus less heat transfer in the application. It is especially suitable for the designs where space is limited and needs high voltage protection.

Specifically, SMOV25S301MP provides wide applications in switch mode power supplies, computers, consumer electronics, and automotive electronics such as control mod- ules, solenoids, relays, and audio amplifiers. Different sizes are available for different maximum surge current up to 25A.

Working Principle

MOVs are widely used in circuit protection because of their metal oxide construction and special characteristic of working voltage. When the voltage across it exceeds its specified voltage, MOVs will conduct and clip the input voltage, thus reduce the over-voltage to a safe level. The characteristic of MOVs allows it to handle high-level of voltage spike and high frequency transient surge without breaking the circuit.

The most important performance characteristic of MOVs is its working voltage. Working voltage is the voltage at which MOVs starts to conduct electric current thus reduce the voltage down. MOVs are mainly constructed by zinc oxide and other metal oxides. The difference in the combination of oxides makes the difference in the working voltage of different MOVs.

Specifically, SMOV25S301MP can provide transient surge current up to 25A and clamping voltage up to 330V. It includes low thermal resistance which reduces the self-heating and thus the peak inrush current for circuits. And its nonlinear characteristic of current vs voltage makes it to respond in microsecond.

Conclusion

MOVs are widely used in surge protection while SMOV25S301MP is from Littelfuse MOV series with higher working voltage and lower power dissipation for circuit protection applications. SMOV25S301MP can provide transient surge current up to 25A and clamping voltage up to 330V. For the different areas, different MOVs should be chosen for sensor/motor protection and other electronic applications.

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