DS485MX/NOPB

Overview

The DS485MX/NOPB is a low-power RS-485/RS-422 multipoint transceiver manufactured by Texas Instruments. It integrates one driver and one receiver, supporting data rates up to 2.5 Mbps with a typical driver transition time of 25 ns. The device operates from a single +5V supply (4.75V to 5.25V) and draws a typical quiescent current of 200 μA. It features a wide common-mode input voltage range of -7V to +12V and ensures a minimum differential output voltage of 1.5V under full load conditions. The component includes short-circuit current limiting and thermal shutdown protection for the driver. It is housed in an 8-pin SOIC package.

Feature Summary

• Half-duplex flow-through pinout compatible with MAX485 and LTC485
• Failsafe receiver logic ensuring high output on open circuits
• Thermal shutdown circuitry protecting against excessive power dissipation

Applications

• Multipoint RS-485 communication networks
• RS-422 point-to-point or multipoint links
• Industrial bus systems requiring standard unit loads

Procurement Notes

Verify the LIFEBUY status before procurement, as production has been discontinued. Confirm that the specific ordering suffix matches the required packaging quantity and temperature range specifications. Ensure compliance with RoHS standards and moisture sensitivity levels during storage and soldering processes.

Selection Notes

Select this component for applications requiring compatibility with existing MAX485 designs without redesigning the PCB footprint. Consider the 2.5 Mbps maximum data rate limit when designing for longer cable runs or higher speed requirements. Verify that the system can accommodate the standard unit load constraints for bus topology.

Part Context

This part belongs to the DS485 family of low-power transceivers designed for industrial communication buses. It serves as a direct functional replacement for legacy parts like the MAX485 while offering guaranteed performance across the specified commercial temperature range. The MX/NOPB suffix indicates the tape-and-reel packaging variant.

Replacement Considerations

The datasheet lists the DS485M/NOPB as a tube-packaged alternative within the same family. Other related TI transceivers include the DS36C278 series for ultra-low power applications and the DS36C279 series featuring auto-sleep modes.