Maxim MAX33072E/MAX33073E RS-485 Half-Duplex Transceivers come with high ±65V protection for overvoltage conditions on the communication bus lines, ensuring robust protection in harsh industrial environments. Both devices have ±40V of common-mode range (CMR) within VCCH (+4.5V to +5.5V), exceeding the RS-485 standard of -7V to +12V. This feature is suitable for electrically noisy environments where different systems have shifting ground levels relative to each other. They also incorporate a high ESD protection circuit capable of protecting against ±40kV of ESD HBM (human body model) for driver outputs and receiver inputs (A and B data lines). The Maxim MAX33072E/MAX33073E each contains one driver and one receiver and operates over the +3V to +5.5V supply range. This feature makes it convenient for designers to use one part with either +3.3V or +5V supply voltages across multiple end equipment.