DS485TMX

Overview

The DS485TMX is a low-power RS-485/RS-422 multipoint transceiver manufactured by Texas Instruments, originally from the National Semiconductor portfolio. It features one driver and one receiver in an SOIC-8 package. The device supports data rates up to 2.5 Mb/s with a supply voltage of 5 V. Operating current is 900 uA. It functions in half-duplex mode within a temperature range of -40°C to +85°C. The component includes a shutdown feature for power management.

Feature Summary

• Low power consumption suitable for battery-operated systems
• Supports multipoint communication on RS-485 and RS-422 buses
• Integrated shutdown mode to minimize standby power usage

Applications

• Industrial automation control networks
• Building automation and security systems
• Data acquisition systems requiring long-distance communication

Procurement Notes

Verify obsolescence status as the DS485TMX/NOPB is listed as obsolete by distributors. Confirm availability of equivalent active components from Texas Instruments or other manufacturers if immediate replacement is required for production lines.

Selection Notes

Select this component for applications requiring standard RS-485/RS-422 compatibility with moderate data rates. Ensure the design accommodates the 5V supply requirement and SOIC-8 footprint. Consider thermal performance within the specified industrial temperature range during layout.

Part Context

This part belongs to the DS485 series of low-power transceivers. It shares functional similarities with the DS485M and DS485MX variants. The TMX suffix indicates tape and reel packaging. The NOPB suffix denotes lead-free and RoHS compliance.

Replacement Considerations

Direct replacements include DS485M/NOPB and DS485MX/NOPB. Other compatible parts may include ST485 or SN75176 variants, subject to pinout and electrical specification verification.