SMAJ70

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TVS - Diodes

Transient voltage suppressors (TVS) are electronic components designed to protect other components from sudden changes in voltage or transients. They are one of the most important components of electrical installations and circuits, as they provide a simple and effective way to protect electronic components from damage or malfunction due to excessive voltage or current.

The SMAJ70 is a type of TVS diode commonly used in circuits for voltage spike protection. It is a transient voltage protection device made of an avalanche Diode and a Zenner Diode connected in opposite directions. This configuration provides excellent protection from transients up to 57V and transient protection up to 100V. Its power dissipation rating is 1.5W and the peak pulse current rating is 70A.

Applications

The SMAJ70 can be used for a wide range of applications. Common uses include overvoltage protection for data lines, consumer electronics, ac-dc adapters, computers, and communication equipment. It is also commonly used in automotive applications such as electronic control modules and automotive electrical systems.

Working Principle

An SMAJ70 is a bidirectional device with an anode on one side and a cathode dot on the other. During normal operating voltage conditions, the Diode remains in reverse-bias and no current passes through.

At the moment of an overvoltage condition, the Diode switches to a forward-bias state and current starts flowing from anode to cathode. The current is then limited by a pre-determined Zener voltage of the Diode, after which the power dissipates harmlessly as heat in the Diode.

The SMAJ70\'s combination of an avalanche Diode and a Zener Diode allows for superior voltage protection while its low power dissipation rating prevents the Diode from overheating and failing.

Conclusion

The SMAJ70 is a type of TVS Diode commonly used in circuits for voltage spike protection. Its combination of an avalanche Diode and a Zener Diode provides excellent protection from transients up to 57V, and its low power dissipation rating prevents the Diode from overheating and failing. The SMAJ70 can be used for a wide range of applications, including overvoltage protection for data lines, consumer electronics, ac-dc adapters, computers, and communication equipment.

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