MXLSMBG70AE3 Circuit Protection

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A Transient Voltage Suppression Diode (TVS) is a device used to protect electronic equipment from the destructive effects of electrical transients. The MXLSMBG70AE3 TVS diode from Littelfuse is designed to protect against Electrostatic Discharge (ESD) and other forms of transient voltage. To understand this product’s application field and working principles, we will look at a few key concepts.

Application Field

The MXLSMBG70AE3 is designed to protect in applications mainly dealing with signals, such as automotive, consumer, and industrial electronics. The applications can range from analog, digital, or high frequency (RF) lines. It is recommended for use in the protection of data lines, including all LVDS (Low Voltage Differential Signaling), HDMI I/O, USB, and MIPI applications. It can also be used for ESD and surge applications on Automotive and Industrial Ethernet lines. The other areas of application are Lighting (White LED, RGB LED, or other LED applications), Automotive SMPS/DC/DC converters, HVAC controls, and various Industrial and Consumer electronics applications.

Working Principles

The MXLSMBG70AE3 TVS diode utilizes a combination of protective mechanisms to achieve the desired transient protection. The device has the ability to respond quickly to instantaneous high surge currents, and it will clamp the transient voltage before it can damage the downstream circuit. This response is based on reversed breakdown voltage and a capacitance effect. When the voltage exceeds a certain threshold, an avalanche breakdown occurs, resulting in a current path through the device. The current will then be diverted in the form of a surge through a built-in internal resistor, effectively grounding the offending voltage. At the same time, the capacitance effect of the device will reduce the rate of rise of the transient, leading to an even lower peak voltage.

When the transient current dissipates, the device can reset itself to its normal operational state. This reset is based on the device’s ability to “store” energy and regenerate its protective abilities. This makes it ideal for applications requiring protection from multiple ESD events. The low clamping voltage of the MXLSMBG70AE3 also minimizes the device’s impact on the performance of the main circuit.

Conclusion

The MXLSMBG70AE3 is a TVS diode from Littelfuse specifically designed for use in applications requiring protection from Electrostatic Discharge (ESD) and other types of transient voltage. The device is well suited for protecting against signal line transients and is recommended for applications such as consumer, industrial, and automotive electronics, among others. The device achieves protection through a combination of mechanisms, including reversed breakdown voltage and capacitance effects, as well as the ability to store energy and reset itself. This makes the MXLSMBG70AE3 a great choice for providing reliable protection for a variety of electronic designs.

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