SMBJ120AHM4G

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TVS (transient voltage suppressor) diodes are widely used in most engineering applications, particularly in those that have high voltage, high energy, high frequency, or ESD (electrostatic discharge) events. The SMBJ120AHM4G is an example of such a device. This article will examine the application field and working principle of the SMBJ120AHM4G.

The SMBJ120AHM4G is an uni-directional device that protects against overvoltage transients, reverse polarity voltage transients, and electrostatic discharges. The device is able to sustain an operating voltage up to 1500 W (peak pulse power). It also has a response time of less than 1 nano-second, making it a suitable choice for applications requiring high-speed transient voltage protection. In addition, the device is RoHS compliant and can withstand a maximum operating temperature of 85 degrees Celsius.

The SMBJ120AHM4G is suitable for a number of applications, such as automotive, appliance, telecom, digital consumer electronics, and industrial equipment. It can be used to protect signals in communication systems, to protect and control power supplies, and to protect other components. Furthermore, it can be used in power supply & circuit protection on and off-board, such as in DC to DC converters, LED/lamp driver, AC power supply, automotive & motor control circuits, computer motherboard, and PC peripherals.

The working principle of the SMBJ120AHM4G is relatively simple. When an overvoltage or electrostatic surge is detected, the device instantly switches itself on, redirecting the surge current to ground. The device remains in an on-state until the surge event is finished – typically milliseconds – after which it will switch itself back off. This temporary re-direction of current is known as ‘clamping’ and helps to protect the circuit from damage.

The SMBJ120AHM4G is an example of a TVS diode, an important type of transverse voltage suppressor. The device is key for high-voltage applications, providing effective protection from overvoltage events, reverse polarity voltages, and electrostatic discharges. The device’s wide range of applications, fast response time, and ability to withstand extreme temperatures makes it a highly desirable choice for engineers.

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