SMAJ100CA-TP Circuit Protection

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TVS diodes are a form of overvoltage protection technology used to protect sensitive electronic components from high-voltage transients caused by electrical disturbances like voltage spikes. The SMAJ100CA-TP is one of these TVS diodes, specifically designed for automotive applications. It has a reverse standoff voltage of 100 volts and a maximum reverse clamping voltage of 167 volts, making it suitable for a wide range of applications from consumer electronics and low-voltage automotive circuits to industrial control systems operating at medium to high voltage. To learn more about the SMAJ100CA-TP, let’s take a closer look at its application field and working principle.

Application Field and Usage

The SMAJ100CA-TP is designed for automotive applications that are subjected to electrical disturbances, such as Car Audio Systems, Automotive LED Drivers, Automotive Gate Drivers, Automotive Switch Mode Power Supplies, Automotive Battery Management Systems, Automotive ECU, Automotive Communication Networks, and Automotive Body Computer Network Control. It can also be used in a variety of consumer electronics applications where overvoltage protection is required, such as Plasma Display Panels and LCD TVs, Notebooks and Tablets, and Digital Set-Top Boxes.

This device is available in an SMA (DO-214AC) ultra-small surface mount package with a lead-free process. This provides excellent thermal performance, allows for improved thermal self-regulation in extreme environmental and ambient conditions, and ensures improved reliability. The device also features a wide operating temperature range of -55℃ to +175℃. This makes it suitable for a wide range of automotive and ubiquitous operating conditions.

Working Principle

The SMAJ100CA-TP is designed to offer overvoltage protection by clamping transients when the voltage exceeds the clamping voltage limit. This is accomplished by the device’s internal structure, which consists of a high-performance Zener diode and a low-resistance shunt. When a voltage spike exceeds the breakdown voltage of the Zener diode, the Zener diode conducts, and the current is routed to the low-resistance shunt, which then clamps the voltage to a safe level.

The device also features a low reverse capacitance of typically 4pF, which limits the type and magnitude of the voltage transients that can be clamped. Additionally, the SMAJ100CA-TP features a low reverse leakage current of typically 10µA, ensuring improved safety and reliable operation. This low leakage current also helps to prevent premature activation of the device in high ambient temperatures, as well as ensuring that the device will accurately respond to overvoltage transients.

The SMAJ100CA-TP also features peak pulse power capability of 4000 Watts, allowing it to safely absorb and dissipate surges. This device is available in an SMA (DO-214AC) ultra-small surface mount package with a lead-free process, making it easy to install and providing a wide range of operation temperatures.

Conclusion

The SMAJ100CA-TP is a versatile TVS diode designed for a wide range of automotive and consumer electronics applications. Featuring a wide operating temperature range, a low reverse capacitance, and a low reverse leakage current, this device offers superior protection against overvoltage transients. Additionally, its peak power capability ensures safe and reliable operation. Thanks to its small form factor, it is easy to install in a variety of applications.

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