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TVS-DIODES – MXSMLJ70CA APPLICATION FIELD AND WORKING PRINCIPLE

Transient Voltage Suppression (TVS) diodes are pre-designed semiconductor packages used to protect different types of electronic components from transient voltage spikes (also known as voltage surge or electrostatic discharge, or ESD). TVS diodes come in a variety of shapes, sizes, and power levels. The MXSMLJ70CA device is a 700 watt Transient Voltage Suppression (TVS) Diode with 70-volts peak pulse power dissipation. It is designed to protect against an array of electrical transients such as ESD, lightning, inductive switching, and is designed to function as either a stand-alone component, or be integrated into a larger, more complex system.

The MXSMLJ70CA has a range of applications:

• Computer, Communication, Audio/Video, Automotive and Telecommunications equipment
• Consumer electronics
• Power supplies
• Charge pumps

The primary purpose of the MXSMLJ70CA is to provide protection against sudden voltage surges and the accompanying damages. To provide such protection, the TVS diode conducts all the current spikes into the ground (called ‘clamping’). This allows the induced voltage to be limited quickly within a safe range, protecting any connected devices from sudden surges that can otherwise cause irreparable damage.

The Principle of Operation for MXSMLJ70CA

TVS devices limit the voltage applied across them, conducting current and providing a path to ground for this current. The MXSMLJ70CA has a maximum peak pulse power dissipation rating of 700 W (7A, 100V), and a reverse standoff voltage of 7 V. The power dissipation is the maximum voltage across the device during normal operation.

Under normal application, the voltage (V) and current (I) are applied between the cathode and anode of the device. If the applied voltage exceeds the specified breakdown voltage of the device, the diode will turn on and begin to conduct. The current increases until it reaches a maximum, called the ‘clamping current’, then begins to drop as the forward-biased junction of the diode is able to pass more current.

The current then continues to decrease until the diode reaches the ‘snubber voltage’, where it begins to reverse bias and reduce the current. The snubber voltage is defined as the voltage across the diode at which the total current is 50% of the peak clamping current. At this point, the diode stops conducting and the current begins to ramp up again until it reaches the voltage at the end of the transient. The MXSMLJ70CA has a total clamping voltage of 7V.

In order to ensure that the diode is providing the best possible protection, it should always be selected with a rated breakdown voltage that is greater than the anticipated maximum transient voltage. This allows the diode to quickly curtail the transient spike which might otherwise cause connected components to breakdown.

Conclusion

The MXSMLJ70CA is a 700W Transient Voltage Suppression (TVS) Diode designed to protect components from transient voltage surges and other sudden voltage spikes such as ESD, lightning and inductive switching. This device provides an effective path to ground to quickly limit the induced voltage within safe limits. Its wide range of applications include consumer electronics, computers, communications, automotive and telecommunications equipment, charge pumps, and power supplies. To ensure optimal protection, the diode should be selected to have a rated breakdown voltage higher than the anticipated maximum transient voltage.

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