ESDU02A12VR17V Circuit Protection

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Mixed technology transient voltage suppressors (TVS) are based on a combination of technologies that aid in the functional performance benefits for explosive energy dissipation in a circuit. The ESDU02A12VR17V, is a perfect example of this, where a two-terminal metal-oxide varistor (MOV) is placed in parallel with a high-speed, low capacitance, metal-oxide thyristor. This two-in-one TVS device can help protect sensitive electronics from lightning-induced transients, power cross, electrostatic discharges, and inductive load switching transients. It provides superior performance with low leakage of <10nA and clamping voltage of 13.1V at 24A currents.When looking at the application field in which this device can be used effectively, it stands out in high-speed signal line protection for industrial, automotive, individual equipment, personal computers, and telecom applications. Automotive uses of this device could include battery reverse polarity protection, ground fault protection, alternator protection, and more.The working principle of this potent two-in-one device is to provide protection in the form of shunt regulation. This is achieved by connecting the positive voltage to one end of the series combination device and the earth connection to the other end.When the voltage between the two nodes rises above the maximum operating voltage, the non-linear portable device comes into action. This redirects the excess energy away from the protected circuits, thus protecting them from voltage spikes.Since the device is composed of both an MOV and an SCR in parallel, and the components work in a destructive manner, it allows for superior response speeds that can meet or exceed the response time of about 1 microsecond in the majority of applications.In order to understand how the device works during a transient event, we must look into how the two components interact during the process. The MOV acts as a voltage clamp that engages at voltages above the specified voltage and then diverts some of the excess energy away to ground, thus protecting the load.The SCR triggers a low impedance path quickly, effectively protecting the load from over-voltage conditions for the onboard up-time. The SCR being triggered will limit the voltage across the protected device to its clamping voltage level, and provide the necessary safe and reliable protection across the entire operating temperature range.The combination of MOV and SCR creates a remarkable two-in-one protection device that features a very small size, low cost, low capacitance, superior response, and high power handling capabilities.Overall, the ESDU02A12VR17V hybrid TVS provides 1-port protection in an easy-to-implement, low-cost solution. It is specially designed for applications that require a fast response to destructive transients and is perfect for protecting sensitive circuits against lightning-induced surge transients, power cross, EMI, and inductive load switching transients.

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