MXLSMLJ150A Circuit Protection

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TVS - Diodes

Transient voltage suppressors (TVSs) are among the most widely adopted electrical components in modern electronic systems. TVS diodes are part of this broader family of devices used to protect circuits from threatening voltages, spikes, or overvoltages. By temporarily limiting voltage oscillations, these devices act as protective shields or peak-clippers, safeguarding the delicate components of a system. Applications range from surge protection for portable devices, to protecting against system-level transients.

One of the most popular devices in the TVS family, the MXLSMLJ150A, is an advanced transient voltage suppressor specifically designed to address destructive transients in digital and analog circuits. This 200W device is capable of voltage and current thresholds of 150 V and 18A, respectively. This device is compliant with UL1449, the standard for surge protection devices, and features a popular, highly efficient “junctionless” construction, with a breakdown voltage of 170V.

Application Field

The MXLSMLJ150A offers a wide range of applications in both the consumer and industrial markets. From telecom networks to computer peripherals, medical systems, and automotive electronics the MXLSMLJ150A is designed to protect electromechanical systems operating in a variety of environments. In consumer goods applications, such as consumer audio, electronic games, and mobile phones, incorrect voltages can cause malfunction or destruction. The MXLSMLJ150A is designed to guard against transients and other incorrect voltages that can enter a circuit, protecting against system-level failure.

In industrial applications, the MXLSMLJ150A is suitable for use in equipment such as hand-held computers, bar code scanners, and motor controllers. As these systems are required to operate in challenging and unpredictable environments, the robust MXLSMLJ150A is essential in providing them with adequate protection. The current carrying capability of the MXLSMLJ150A is ideal for protecting against heavy load current spikes and destructive lightning currents. In addition, the device features a low capacitance rating of 5.4pF, essential in preventing data corruption in high speed networks.

Working Principle

The MXLSMLJ150A is an advanced and reliable form of bilateral protection. It helps to protect circuits from voltage or current transients that exceed the normal operating levels. When this occurs, it suppresses voltage and current beyond the peak values, clamping the voltage into a range it can handle. This helps to prevent malfunctions in systems caused by the electrical disturbances from overvoltage and overcurrent.

It operates using a junctionless architecture, with the power device built into a single structure rather than using two separate components connected by a p-n junction. This type of construction eliminates the risk of a potential breakdown, providing greater levels of protection due to its self-adjusting nature.

The device works on a basic principle of positive temperature coefficient (PTC). When the voltage rises, so too does the temperature and the resistance increases, which helps to limit the amount of current flowing through the device. This reduces the peak voltage and helps to prevent a damaging voltage surge.

In situations where overvoltage persists, the device is fashioned to absorb peak currents, similarly reducing the maximum voltage and enabling the device to remain functional and undamaged.

Conclusion

The MXLSMLJ150A is a versatile and robust transient voltage suppressor, designed to protect electromechanical systems from voltage transients and overvoltages. Its reliable performance is suitable for protecting high speed networks from data corruption, and its wide range of applications make it a popular solution in the consumer, industrial and communications markets. Its ‘junctionless’ design increases the device\'s reliability and protection against destruction, and its positive temperature coefficient facilitates a self-adjusting response to overvoltage scenarios.

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