SM15T18CAHE3/57T Circuit Protection

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TVS (transient-voltage-suppressor) diodes have become an essential component in the protection circuits of most sensitive electronic systems. The SM15T18CAHE3/57T is a device in a common small DO-214AA (SMC) package appropriate for wide array of surface mount applications. This device is designed to protect against electrostatic discharge, electrical transients, and power surges.

Overview

The SM15T18CAHE3/57T is a unilateral transient voltage suppressor (TSP) designed for bidirectional, high-speed applications. It contains a Zener diode and a parasitic bipolar structure. When a surge current exceeds its source current limit, the diode is turned on to shunt current away from sensitive components. This device can carry up to 20A peak pulse current (<300MΩ dynamic resistance at 18V) and can withstand transient voltages up to 18V.

Package

The SM15T18CAHE3/57T is packaged in the SMC-2 (DO-214AA) package. This package is semiconductor industry’s standard form factor for a medium power TVS. The standard SMA package allows the device to be used in a variety of surface mount applications with high thermal performance. The SMC-2 package allows for increased current rating without increasing the footprint of the device.

Application Fields

The SM15T18CAHE3/57T is suitable for a variety of application fields including automotive electronics, consumer electronics, computer equipment, building controls, communications devices, power tools, and medical devices. It is often used as a surge suppressor for protection against electrical transients in circuits handling high current. Its high peak pulse current rating of 20A (1.2/50us) makes it ideal for applications requiring superior protection.

Working Principle

The working principle of the SM15T18CAHE3/57T is based on a Zener diode and a parasitic bipolar structure. The device is designed to protect against ESD, electrical transients, and power surges. When a surge current exceeds its source current limit, the diode is turned on to shunt current away from sensitive components to ground. The device is rated for transient voltages up to 18V and has a peak pulse current capability of up to 20A.

Benefits

The SM15T18CAHE3/57T offers improved protection over standard diodes with its high peak current capability and enhanced protection against ESD, electrical transients, and power surges. It is also well suited for applications with high power dissipation, making it ideal for high power applications. Additionally, the device features a small form factor (SMC-2 package) and is suitable for a wide variety of surface mount applications.

Conclusion

The SM15T18CAHE3/57T is a unilateral transient voltage suppressor (TVS) device designed for bidirectional, high-speed applications. It is packaged in the SMC-2 (DO-214AA) package and is suitable for a variety of application fields including automotive electronics, consumer electronics, computer equipment, building controls, communications devices, power tools, and medical devices. This device is rated for transient voltages up to 18V and can carry up to 20A peak pulse current, offering superior protection over standard diodes. It also features a small form factor and high power dissipation capability, making it ideal for high power applications.

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