RS-485 transceivers operate in noisy industrial environments typically require surge protection at the bus pins. Figure 9-3 compares the surge protection implementation with a regular RS-485 transceiver (a), against that with a surge-integrated RS-485 transceiver (b), such as the THVD24x9 family. The internal TVS protection of the THVD24x9 achieves up to ±3kV IEC 61000-4-5 surge protection (SOIC package) without any additional external components, reducing system level bill of materials.

Figure 9-3 Implementation of System-Level Surge Protection Using THVD24x9