SMBJ70A

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TVS – Diodes

Transient Voltage Suppressors (TVS) diodes, also called ‘avalanche diodes’, are used to protect sensitive electronic equipment from excessively high voltage surges which can cause permanent damage or data loss. The SMBJ70A is a TVS diode that is used to protect components from large overvoltages by quickly conducting current away from them.

Application Field of the SMBJ70A

This diode is used for protection in communication systems, personal computers, programmable controls, fax systems, and automotive electronics. It has cathode and anode terminals that are connected to the circuit that requires protection. The anode goes to ground while the cathode is connected to the voltage source to be protected.

This diode is primarily used to protect inductive loads from sudden surges and can absorb voltage up to +85 volts and withstand peak reverse power dissipation up to 100 watts. It has an operating junction temperature of -55 to +150°C and a storage temperature between -55 and +175°C. The SMBJ70A also has a fast response time, which makes it suitable for protecting high-speed digital lines.

Working Principle of the SMBJ70A

When the voltage across the diode reaches the avalanche voltage, a large amount of current flows through it. This current is conducted away from the component requiring protection. The SMBJ70A has a unidirectional response and will not respond to negative voltages. At the same time, the device absorbs the surge current and clamps the voltage level to a safe level.

This TVS diode works by using the avalanche effect. When a voltage applied across the diode reaches its avalanche voltage, the electric field created in the junction region of the diode is strong enough to break down the existing depletion region, allowing a large amount of current to flow through it. The diode then absorbs this surge current, and clamps the voltage to a safe level.

The SMBJ70A also has a low reverse-leakage current and a low capacitance, making it suitable for pulse applications and high-speed digital lines. Its low capacitance also ensures that the diode has a fast response time to reduce the duration of overvoltage protection.

Conclusion

The SMBJ70A is a TVS diode that is used to protect sensitive electronic components from large overvoltages. It is specially designed to protect inductive loads from surges and will absorb voltage up to +85 volts while withstanding peak reverse power dissipation up to 100 watts. The SMBJ70A also has a low reverse-leakage current and a low capacitance to ensure a fast response time and reduce the time of overvoltage protection.

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