SMA5J11AHE3/5A Circuit Protection

Transient voltage suppression (TVS) diodes are semiconductor devices used to protect against transient voltage events in circuits. SMA5J11AHE3/5A diodes are one of the devices used in this type of application. In this article we will discuss the application field and working principle of this device.

Applications

SMA5J11AHE3/5A diodes are particularly used in the protection of electronic circuits and components from Electrostatic Discharge (ESD) caused by Human Body Model (HBM) and Machine Model (MM). The device can be used in both analog and digital circuits, ranging from low voltage to high voltage applications. Typical applications include circuit protection for automotive, general consumer electronics, computer and mobile products, telecom, and industrial equipment.

Working Principle

The SMA5J11AHE3/5A diode is a 3-pin, Zener diode with a reverse breakdown voltage of 5.11V and an ESD clamp voltage of 11.1V. In normal operation, it functions as a high value resistor. When an ESD pulse is applied, the diode continues to act as a resistor, but with a much lower value, which results in a rapid current spike, and then dissipates the current. This provides protection while still allowing for normal circuit operation. The device has a maximum power dissipation of 500mW and a maximum reverse leakage current of 10mA at 5.11V.

The SMA5J11AHE3/5A diode is also designed to provide over-voltage protection (OVP) capability. When an over-voltage condition occurs, the diode will clamp the voltage to its rated limit, thus preventing damage to the device or the related circuitry. The device can also provide protection against voltage transients, such as those seen in the automotive industry.

Conclusion

This article discussed the application field and working principle of the SMA5J11AHE3/5A device. The diode is used in a variety of applications and provides protection from ESD, OVP, and voltage transients. It is a 3-pin, Zener diode with a reverse breakdown voltage of 5.11V and an ESD clamp voltage of 11.1V. Its maximum power dissipation is 500mW and the maximum reverse leakage current is 10mA at 5.11V.