SMF20A-HM3-18

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TVS (transient voltage suppression) diodes are widely used in various high-frequency circuits to help prevent short-term overvoltage, undesired induced currents, and electromagnetic interference (EMI) from damaging systems. Of these, the SMF20A-HM3-18 is a specialized type of TVS diode used in high-power, high-frequency digital circuits due to its high electrostatic discharge (ESD) protection levels. This application field and its working principle are discussed in this article.

SMF20A-HM3-18 Application Field

The SMF20A-HM3-18 is designed for ESD protection in high-power, high-frequency digital logic circuits. These TVS diodes are particularly suited for circuits using high-speed logic devices such as FPGAs, ASICs, and PCMs. They are also ideal for applications utilizing signal gates, high-speed I/O ports, and high speed transceivers such as USBs and OTG.

Due to their low parasitic capacitance, these TVS diodes are also popular in high-speed data applications such as firewire, Ethernet, and audio/video. They can also be used for protection against overvoltages such as from electrostatic discharge in industrial and commercial equipment.

SMF20A-HM3-18 Working Principle

TVS diodes are operated by a reverse voltage, using a process called ‘clamping’ to prevent and reduce overvoltage. The SMF20A-HM3-18 limit the peak reverse voltage by essentially acting as a reverse-conducting diode. With this action, it typically dissipates very little energy.

The SMF20A-HM3-18 starts to conduct current at a reverse voltage of 18 V and continues to conduct until the voltage reaches 20 V. This helps to maintain a low voltage level and prevent ESD from damaging the components. Once the transient voltage is removed, the diode returns to a non-conducting state.

The SMF20A-HM3-18 also features low operating and capacitance rates. This means they are able to conduct high-frequency signals without severely affecting the performance of the circuit. This makes them ideal for digital logic circuits with very fast edge rates.

Conclusion

The SMF20A-HM3-18 offers reliable ESD protection for high-power, high-frequency digital circuits. Through clamping, the TVS diodes are able to limit peak reverse voltages to prevent damage without having to dissipate a lot of energy. With its low capacitance rates, it can also transmit high-frequency signals without affecting performance. All in all, the SMF20A-HM3-18 is a great choice for ESD protection in digital circuits.

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