This application note provides the design method and component selection guidelines for the protection of automotive electronics from electrical hazards.
This document serves as a design guide for electronic module designers to protect automotive electronics from electrical hazards such as electromagnetic interference (EMI), electrostatic discharges (ESD), and other disturbances. It outlines the sources of these hazards within the automotive environment, including conducted and radiated types generated by components like ignition systems and relays.
The note details relevant protection standards, specifically ISO 10605 for electrostatic discharges and ISO 7637 for electrical disturbances from conduction and coupling. It provides parameters to consider when selecting protection devices, such as nominal voltage, maximum supported voltage, and surge characteristics. Additionally, it includes worked design examples with calculations for data line and supply rail protection topologies, along with recommendations for PCB layout to improve solution performance.
The document mainly concerns the ISO 10605 and ISO 7637 standards regarding electrical hazards.
Automotive specifications require support for this over-voltage application for up to 5 minutes.