How to Select ESD Protection Devices for Ventilator Data Interfaces?

The core of the selection process is to ensure that the parasitic capacitance of the protection device is sufficiently low to avoid signal integrity degradation. For high-speed data lines such as USB 2.0, specially designed ultra-low capacitance TVS diode arrays must be selected, with a typical single-line-to-ground capacitance value below 0.5pF. These multi-channel TVS arrays can simultaneously protect data lines D+, D-, and the power line Vbus. For analog or low-speed digital interfaces connected to sensors, although the capacitance requirements are relatively relaxed, single-channel TVS devices with extremely low leakage current should still be selected to prevent sensor measurement accuracy from drifting due to leakage. All interface protection devices should follow the "place as close as possible" principle, positioned immediately behind the connector ports to ensure that ESD currents are discharged before entering the internal board circuitry.