SMF8V0A-HM3-08 Circuit Protection

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Transient Voltage Suppressors (TVS) Diodes are a type of electrical protection used to guard against electro-static discharge, ESD, and other specific voltage phenomena. The SMF8V0A-HM3-08 is one TVS Diode device, manufactured by Littelfuse, and specifically designed to protect many different types of electronic equipment from a wide range of damaging electrical events. Its application field and working principles are discussed in this article.

Application Field

The SMF8V0A-HM3-08 is a high temperature TVS Diode which can be used in many different types of electronic equipment such as data transmission systems, computers, industrial equipment, and military electronics. The device can operate at temperatures up to 150°C and has low capacitance performance, which makes it ideal for high speed data communication. It is designed to handle electro-static discharge (ESD) pulses up to 8KV, as well as lightning induced surge transients. It is RoHS compliant and also offers reverse voltage protection up to 8V.

Working Principle

The working principle of the SMF8V0A-HM3-08 TVS Diode is based on a two-stage protection system. The first stage is the voltage overload protection, which absorbs all of the incoming ESD, lightning, and surge transients that exceed a predetermined voltage threshold and current rating. The second stage is the reverse voltage protection, which is used to protect the diode from long-term over-voltage and reverse current damage. The reverse voltage protection works by monitoring the diode\'s reverse current flow, and if it exceeds a certain preset limit, the device will be shut down. Additionally, a third stage protection is provided by an adjustable circuit breaker that quickly trips when the current exceeds the predetermined limits.

Conclusion

The SMF8V0A-HM3-08 is a robust and reliable TVS Diode that can provide comprehensive protection to many different types of electronic equipment. It is designed to handle a wide range of voltage extremes, from electro-static discharge and lightning-induced surges to reverse voltage protection. Its two-stage protection system ensures that the device is always operating in an appropriate and safe manner. The third stage of protection provided by the circuit breaker prevents the device from being permanently damaged by over-currents.

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