SMCG40A-E3/9AT Circuit Protection

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Transient voltage suppression (TVS) diodes protect the entire circuit from overvoltage transients including inductive loads and impulse conditions. In particular SMCG40A-E3/9AT from Littelfuse, Inc. is a unidirectional silicon avalanche diode designed for a wide applications field including over-voltage protection and communication equipment. It offers reverse stand-off voltage rating (VRWM) from 17.8 to 48.6V with 9A peak pulse current capability (ppm).

SMCG40A-E3/9AT Application Field

SMCG40A-E3/9AT offers best performance for various application fields. It is suitable for digital isolation, bus line working surge protection, data line surge protection, high-speed data transmission, Over Voltage Protection (OVP) and automotive applications. SMCG40A-E3/9AT is also widely used in audio, video & telecom applications, outdoor equipment and other over-voltage sensitive devices.

These TVS diodes can be applied in multiple devices, such as: Game consoles, computers, mobile phones, digital video camcorders, display & audio equipment, network routers, power supplies, and various overvoltage-sensitive applications.

SMCG40A-E3/9AT Working Principle

The operating principle of the SMCG40A-E3/9AT TVS diode involves the application of reverse voltage across the diode. This voltage causes an internal electric field that overcomes the power applied to the diode. The charge stored in the diode dielectric material will be discharged rapidly in the form of an avalanche current when the breakdown voltage is exceeded.

When the voltage across the diode is higher than the working voltage of the TVS diode, the avalanche current will be discharged within nanoseconds. The diode will be able to protect the entire circuit from overvoltage transients, including any induced current and high-speed spikes.

The SMCG40A-E3/9AT has a maximum breakdown voltage of 48.6V, and an avalanche energy of 17.5mJ. It has a maximum operating junction temperature range of -65°C to 125°C. Its maximum capacitance range is 2.5 to 7.5pF and its AC current range between 0 and 6mA.

Conclusion

SMCG40A-E3/9AT from Littelfuse, Inc. is one of the best transience voltage suppression (TVS) diodes available, suitable for industrial, automotive, and many other applications. It offers reverse stand-off voltage rating (VRWM) from 17.8 to 48.6V with 9A peak pulse current capability (ppm). It is designed to protect various circuits from overvoltage transients, including inductive loads and impulse conditions. Its maximum breakdown voltage is 48.6V and it has a maximum operating junction temperature range of -65°C to 125°C.

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