1KSMB18AHR5G Circuit Protection

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Thyristor surge-protection devices (TSPDs), also known as transient voltage surge suppressors (TVSs), are a type of semiconducting surge-protection component that safely absorbs the transient over-voltage from the supply line, helping to maintain operation of the protected device. The 1KSMB18AHR5G is a unidirectional TVS diode designed to protect voltage sensitive components from high-energy transients caused by electrostatic discharge (ESD), primarily in electronics applications, telecommunication, and automotive applications.

Overview

The 1KSMB18AHR5G diode offers superior ESD performance and reliable operation. It includes an anode and a cathode, both of which are connected to a zener diode. An anode is a type of semiconductor terminal surface used to promote electron flow. A cathode is the terminal surface that attracts electrons. The zener diode, in turn, is designed to clamp down the voltage at the anode when it exceeds a certain amount.

The 1KSMB18AHR5G is rated for use at 18 volts, with a peak power rating of up to 1.0 kilowatts and surge rating of 18 amps. It has a withstand voltage rating of 18 volts, and a reverse voltage rating of 5.0 volts. The clamping voltage is 18 volts and the thermal resistance is 55 °C/W. It has a maximum leakage current of 1.0 mA and a reverse recovery time of 1.5 ns.

Working Principle

When an ESD event or voltage surge occurs, the 1KSMB18AHR5G conducts current from the anode to the cathode. As current passes through the zener diode, it begins to dissipate some of the excess energy, which helps to protect the adjacent components. The zener diode continues to dissipate energy until it reaches the breakdown voltage, at which point it becomes essentially an open circuit and stops conducting current. At this point the diode is said to be “clamped” and the current has been redirected away from the protected device. This helps to prevent damage from occurring due to the over-voltage event.

Applications

The 1KSMB18AHR5G diode can be used in a wide range of applications, from consumer electronics to automotive. It can be used to protect against ESD events from electrostatic discharge, for example, or from power surges, such as lightning strikes. It can also be used to protect sensitive components from power surges caused by short circuits, or from high voltage transients from motors, switches, and other components. This diode is also suitable for use in military, aerospace, and medical applications.

Conclusion

The 1KSMB18AHR5G is a unidirectional TVS diode designed to protect voltage sensitive components from high-energy transients caused by electrostatic discharge (ESD) or power surges. Its anode and cathode are connected to a zener diode, which helps dissipate some of the excess energy to protect the adjacent components. The 1KSMB18AHR5G is suitable for use in a variety of applications, from consumer electronics to automotive and military applications. It offers excellent ESD performance and reliable protection from over-voltage transients.

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