VGAS120618D400DP Circuit Protection

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TVS (Transient Voltage Suppressors) devices, MOVs (Metal Oxide Varistors) and VGAS120618D400DP have an important role of protection in an electronics system. This article will discuss the application fields of VGAS120618D400DP and its working principle.

Application Fields

TVS are used in different applications to protect against transients in the power supply. VGAS120618D400DP is a particularly attractive TVS for protecting sensitive components from electrostatic discharge (ESD) as well as power surges. It is designed to protect downstream components from damage due to voltage spikes and can be used in a wide variety of situations, such as automotive, industrial, consumer, LAN, and telecom applications.

The VGAS120618D400DP is a bidirectional silicon TVS that can withstand up to 400W peak pulse power. It has an operating voltage range of 4.5 V to 18 V. It is an 1812 device with a 0.65 ohm on-state resistance, and its maximum clamping voltage is typically 35 V, with a 35 A peak pulse current. Due to its low capacitance of 0.22 pF, it is well suited for applications where high-speed signals need to be protected. It is also ROHS compliant and is available in tape & reel packaging.

Working Principle

Silicon TVS devices, such as the VGAS120618D400DP, use avalanche breakdown of the PN junction to achieve the clamping voltage. When a voltage transient exceeds the device breakdown voltage, electrons now have enough energy to move through the junction and create a high current flow through the PN junction. This current flow results in a voltage drop across the PN junction, thus limiting the voltage and preventing the equipment from any potential damage. The device has a low resistance that helps maintain the current to a safe level.

When the voltage transient has dissipated, the current draw goes back to normal, and the voltage across the PN junction will return to the breakdown voltage. This will ensure the device is ready for use again in the next transient situation.

Conclusion

In conclusion, VGAS120618D400DP is a bidirectional silicon TVS specifically designed to protect electronics systems from ESD, power surges, and voltage transients. Its operating voltage range of 4.5 V to 18 V, low capacitance ratings, and clip rating of 35 A peak pulse current make it an attractive option for a wide range of applications in industrial, consumer, automotive, telecom, and LAN environments. Finally, the device utilizes avalanche breakdown of its PN junction to achieve the needed clamping voltage in order to prevent potentially damaging voltage transients.

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