SM15T24CA-E3/9AT Circuit Protection

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Transient voltage suppressors (TVSs) are designed to provide protection against transient voltage spikes for power supplies, sensitive electronic components or systems. The SM15T24CA-E3/9AT is a specific type of transient voltage suppressor also referred to as a bidirectional transient voltage suppressor or a Transorb diode, and is used to protect circuits from voltage transient generated by inductive loads. This article will discuss the application field and working principle of the SM15T24CA-E3/9AT TVS.

SM15T24CA-E3/9AT is a family of bidirectional transient voltage suppressors which offers a wide protection range from 5 volts to 24 volts. It has low leakage current characteristics for continuous operating conditions up to 10 mA maximum. The purpose of the SM15T24CA-E3/9AT is to clamp or limit transient voltage surges to a safe level. These devices are designed for transient overvoltage protection for circuits in applications such as automotive, industrial, telecom, consumer electronics, data lines, and computers. It is suitable for both AC and DC transient clamping applications, allowing for flexible system design.

The SM15T24CA-E3/9AT has an operating voltage of 5V ~ 24V, a clamping voltage of 12V, an average on-state resistance of 0.241Ω, and a maximum peak pulse current of 8A. The device also has a mechanical endurance of 20,000 cycles and a maximum capacitance of 11.7pF. The SM15T24CA-E3/9AT has a surge rating of 20A and an ambient temperature range of -55 °C to +125 °C. It also has a fast switching speed and low capacitance of 11.7pF.

The principal of operation of SM15T24CA-E3/9AT is simple. It acts as a voltage protection diode between the power and ground lines, with the drain directly connected to the power line and the source connected to ground. It is bidirectional, meaning it can protect against both positive and negative transients. In the case of an overvoltage, the device absorbs the energy until it reaches a safe level, protecting the sensitive components of the system from the high voltage. When the voltage returns to its normal level, the device resumes its off state.

The SM15T24CA-E3/9AT is an ideal device for power line transients protection in automotive, industrial, telecom, consumer electronics, and data lines applications. It can be used in conjunction with a fuse in applications like inverters, protection against transients at motor run-up, load dump suppression, etc. With its high surge capability and low capacitance, it is also suitable for use in data and signal line applications such as USB, RS232 and RS485.

In conclusion, the SM15T24CA-E3/9AT is a versatile, bidirectional transient voltage suppressor which can protect circuits from transient voltage spikes and provide a wide protection range. It is suitable for many applications, including automotive, industrial, telecom, consumer electronics and data lines. Its fast switching speed and low capacitance make it an excellent choice for data or signal line applications, and it can be used in conjunction with a fuse for power line transient protection.

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