DS36C278MX/NOPB

Overview

The DS36C278MX/NOPB is a low-power CMOS RS-485 transceiver manufactured by Texas Instruments. It operates on a single +5V supply with a maximum quiescent current of 500 μA. The device features TRI-STATE driver and receiver outputs, a wide common-mode range from -7V to +12V, and thermal shutdown protection. It supports up to 32 unit loads (standard) or 64 nodes (half unit load). Available in an 8-pin SOIC package, it complies with EIA-RS-485 standards and includes fail-safe circuitry for open inputs.

Feature Summary

• Low power CMOS design ensures minimal current consumption suitable for battery-powered applications
• Integrated thermal shutdown circuitry protects the device during excessive power dissipation or fault conditions
• Fail-safe receiver guarantees a high logic output state when differential bus inputs are left open

Applications

• Multipoint data transmission networks requiring RS-485 compliance
• Industrial communication systems operating within extended temperature ranges
• Battery-operated devices where low standby current is critical

Procurement Notes

Verify the specific ordering suffix against the latest TI Package Option Addendum. The MX/NOPB variant indicates a tape-and-reel packaging format. Confirm that the component status aligns with project requirements, as certain variants may be designated as Not Recommended for New Designs or Life Buy. Ensure compatibility with existing PCB footprints and soldering profiles.

Selection Notes

Select this component for designs requiring robust multipoint communication with low power constraints. Verify that the system voltage remains within the recommended 4.75V to 5.25V range. Consider the node count requirements; standard configurations support 32 units while half-unit-load options allow for expanded network topologies without additional repeaters.

Part Context

This part belongs to the DS36C2xx series of low-power RS-485 transceivers. It serves as a direct replacement for legacy components such as the MAX485 and LTC485. The device shares functional similarities with the DS36C279 and DS36C280 but lacks their respective sleep mode and slew rate control features.

Replacement Considerations

Publicly confirmed drop-in replacements include the LTC485, MAX485, DS75176, and DS3695. These alternatives share similar pinouts and electrical characteristics, facilitating direct substitution in existing hardware designs without significant schematic modifications.