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ISO1500: ZD for bus protection

Part Number: ISO1500

Hi team,

 

In 9.2 typical application, bi-directional ZD is placed for bus protection.

Could you recommend what ZD you can recommend  ?

 

Thank you and best regards,

Michiaki

  • Hi Michiaki,

    Thanks for reaching out.

    The protection diode used on the RS-485 bus is the transient voltage suppressor (TVS) diode. The most commonly used TVS diode for RS-485 bus protection is the SM712 which is delicately designed for RS-485 bus protection. Along with the TVS diode, we recommend you to use 10Ω series resistor on RS-485 bus pins between device pins and the TVS diode. Please see below reference design and its design guide for reference schematic, PCB layout and a detailed EMC test data with various protection devices. Thanks.

    https://www.ti.com/tool/TIDA-00731


    Regards,
    Koteshwar Rao