Issue link: https://resources.mouser.com/i/1437732
30 Circuit Protection for High-Speed Serial Interfaces The CAN protocol transceiver needs protection from ESD, fast electrical transients, and other overvoltage transients. Some diode arrays are specifically designed to protect the CAN lines without degrading. Diode arrays have high ESD tolerance, with models having 30kV air and 30kV contact discharge capabilities. These devices help designers meet the ISO 10605 standard for ESD in-road vehicles. Withstanding the high ESD voltages, the diode arrays can absorb up to 50A of transients defined by IEC Standard 61000-4-4 (Electrical Fast Transients). Furthermore, with a capacitance of about 15pF and leakage current under 1µA, the diode arrays do not interfere with protocol transmissions. These devices also survive the automotive environment with a temperature operating range of -40°C to 150°C. Circuits designed to protect a CAN transceiver generally include a two-channel diode array on both the high and low lines. A single protection component containing both arrays is available and helps to reduce pick-and-place costs in production. Figure 2: Diode arrays and polymer ESD suppressors can provide the necessary protection for the high-speed differential data lines. (Source: Littelfuse) The Ethernet transceiver, such as the CAN transceiver, needs ESD and transient surge protection. Diode arrays and polymer ESD suppressors can provide the necessary protection for the high-speed differential data lines. Models of these diode arrays can provide up to ±30kV ESD protection and can absorb up to 50A of Electrical Fast Transients. Diode arrays can protect a differential line pair in a single package to save space. Versions are also available as discrete components in 0402 and 0603 surface-mount packages to minimize capacitance and PCB space. These ESD protection devices cut signal distortion, reduce voltage overshoot, and simplify the circuit design. Capacitance values can get down to 0.35pF for the diode array and down to 0.04pF for the polymer ESD suppressor. These parameters ensure the ESD protection does not impede 1Gbit Ethernet transmission rates. The image sensor is the most important circuit block. A single pair, bipolar set of ESD diodes can protect the image sensor and its circuit. The diodes in this bipolar protection component are oriented cathode to cathode. This model of TVS diode can withstand an ESD strike of up to ±30kV and has an extremely low leakage current with typical values of under 10nA. Its capacitance is around 0.35pF. These TVS diode arrays have ultra-small, 1.0mm × 0.5-mm SOD882 packaging to minimize board space. Keeping protection components as close as possible to the circuit inputs keeps extraneous energy from damaging critical parts. " " A single protection component containing both arrays is available and helps to reduce pick-and-place costs in production.