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In this specific example, the advantages and benefits of the TBU® device in an RS-485 application are evaluated. On the left, users can see the traditional RS-485 circuit diagram showing two 10 Ω resistors and two 12V TVS diodes. While this solution meets RS-485 transmission protocols and fulfills lower tier protection, the disadvantage for some RS-485 applications with potential surge transients is that the solution does not provide any AC power cross protection and the two 10 Ω resistors are not resettable when they are damaged. For the RS-485 application that requires high energy surge protection, the circuit on the right with TVS, MOV, and TBU devices should be considered. This solution offers resettable AC power cross protection irrespective of surge duration or rate-of-repetition, has no let-through energy to sensitive downstream chipsets and provides wide operational bandwidth for high-speed data rates.
