DS485TM/NOPB

Overview

The DS485TM/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 single +5V supply. The device operates within an industrial temperature range of -40°C to +85°C and features a typical quiescent current of 200 μA. Electrical specifications include a common-mode input voltage range from -7V to +12V, short-circuit current limiting, and thermal shutdown protection. It supports up to 32 transceivers on the bus and utilizes an 8-pin SOIC package.

Feature Summary

• Half-duplex flow-through pinout compatible with MAX485 and LTC485
• Failsafe receiver logic ensures high output when inputs are open circuit
• Thermal shutdown protects against excessive power dissipation during fault conditions

Applications

• Multipoint RS-485 communication networks
• Industrial control systems requiring robust differential signaling
• Building automation and security systems

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific suffix matches the required industrial temperature range (-40°C to +85°C). Review the latest datasheet for any updates regarding lifecycle status or packaging changes before finalizing orders.

Selection Notes

Select this component for applications requiring standard unit loads across a wide common-mode voltage range. Ensure the system design accommodates the specified propagation delays and transition times for reliable operation at 2.5 Mbps. Verify that the 8-pin SOIC package fits the available PCB footprint constraints.

Part Context

This part belongs to the DS485 family of low-power transceivers designed for multipoint communication. It serves as a functional replacement for legacy parts like the MAX485 while offering improved power efficiency. The 'TM' designation indicates the industrial temperature grade, distinguishing it from commercial variants.

Replacement Considerations

Pin and functionally compatible with MAX485 and LTC485. Verify that alternative components support the same -7V to +12V common-mode range and 2.5 Mbps data rate requirements.