SMDJ33A M6G Circuit Protection

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TVS (Transient Voltage Suppressor) diodes, sometimes called “transient voltage suppressor” or “TVS diode”, are dynamic semiconductor devices that offer protection to electronic circuits from over-voltage transients such as electrostatic discharge (ESD). The SMDJ33A M6G device, specifically, is designed to provide transient over-voltage protection, guarding against surges and efficient clamping of transient voltage spikes.

Application

The SMDJ33A M6G is used as a protective device for high speed interfaces and other sensitive electronics that require low capacitance and very fast response times. It is suitable for applications such as power lines, communication lines, external peripherals, and human-machine interfaces. It has Peak Pulse Power Dissipation (PPPM) of 600 watts, Bidirectioinal Breakdown Voltage (BV BR ) of 32 volts, and Breakdown Voltage(BV D) of 24 volts.

Working Principle

The SMDJ33A M6G functions as a two-terminal device primarily to protect against voltage surges, Electro-Static Discharge (ESD), and other transient over-voltage events. In normal or non-transient operations, current passes through the device in a normal and controlled manner. The operating principle of the device is based on a Diode Arrangement, where the diode is configured so that the anode is connected to the high voltage terminal and the cathode is connected to the low voltage terminal.

In response to an over-voltage transient, the diode acts as an interface device and the voltage across the two terminals is equal in magnitude but opposite in polarity. This has the effect of shunting the transient voltage away from the protected load. In addition, the parasitic capacitance of the diode also helps in transient protection by providing a low impedance path that channels away the excess charge.

When a transient is experienced, the SMDJ33A M6G enters a state of reverse breakdown where its reverse-biased junction allows a high current to flow, while its high Power Pau Pulse Dissipation capability limits power dissipation of the junctions and prevents damage to the protected equipment. After the transient event, the diode returns to its normal non-conducting state.

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