The SM712-02HTG from Littelfuse is a Transient Voltage Suppression (TVS) Diode Array designed specifically for protecting RS-485 communication interfaces from damaging electrostatic discharge (ESD), electrical fast transients (EFT), and lightning-induced surges. The device features asymmetrical working voltages ranging from -7V to +12V, making it well-suited for applications with uneven voltage requirements.
This TVS diode array is capable of absorbing repetitive ESD strikes well above the maximum level specified in the IEC 61000-4-2 international standard without any degradation in performance. It can also dissipate up to 19A of 8/20us induced surge current in accordance with the IEC 61000-4-5 2nd edition, all while maintaining very low clamping voltages. The low leakage current and AEC-Q101 qualification further enhance its suitability for high-reliability applications in harsh environments.
TVS Diode Arrays
TVS Diode Arrays are components designed to protect sensitive electronics from voltage spikes and surges, such as those caused by electrostatic discharge (ESD), electrical fast transients (EFT), and lightning. These devices work by clamping overvoltage transients to a safe level that the protected circuit can withstand without damage. TVS Diodes are widely used in a variety of applications, including communication interfaces, microcontroller inputs, and power supply lines.
When selecting a TVS Diode Array, engineers should consider the working voltage range, peak pulse power, clamping voltage, and environmental operating conditions of the application. The selection of a TVS Diode Array with appropriate specifications is essential to ensure reliable protection against transient voltage events.
The effectiveness of a TVS Diode Array in a specific application depends on its ability to rapidly respond to overvoltage events and dissipate the induced surge energy without performance degradation. Engineers should also take into account factors such as package size, leakage current, and compliance with industry standards when choosing a TVS Diode for their design.
In addition to technical specifications, the reliability and quality of a TVS Diode Array are important considerations. Devices that are AEC-Q101 qualified, for instance, are deemed suitable for use in automotive applications due to their high reliability in harsh environments. Understanding the specific requirements of the application and the characteristics of the TVS Diode Array will help engineers make an informed selection.