DS36C278TMX

Overview

The DS36C278TMX is a low-power CMOS RS-485 transceiver manufactured by Texas Instruments. It operates at a supply voltage of +4.75V to +5.25V with a maximum quiescent current of 500 μA. The device features one driver and one receiver in an 8-pin SOIC package. It supports data rates up to 10 Mb/s and provides a wide common-mode range from -7V to +12V. The unit load configuration allows for up to 64 nodes on the bus. It includes thermal shutdown protection and fail-safe receiver circuitry.

Feature Summary

• Low power CMOS design ensures significant power savings suitable for battery-powered applications
• Built-in thermal shutdown circuitry prevents damage during excessive power dissipation or fault conditions
• Fail-safe receiver guarantees a high output state when inputs are left open
• Glitch-free power-up/down circuitry permits live insertion and displacement

Applications

• Multipoint data transmission systems compliant with RS-485 standards
• Battery-powered industrial communication networks requiring low standby current
• Bus interfaces supporting extended node counts beyond standard 32-unit loads

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest Package Option Addendum to confirm lead finish, moisture sensitivity level, and environmental compliance status. Ensure the selected variant matches the required operating temperature range and packaging quantity specifications for your assembly process.

Selection Notes

Select this component for designs requiring half-unit load capability to support up to 64 nodes on a single RS-485 bus. Confirm that the system operates within the recommended +4.75V to +5.25V supply voltage range and requires the industrial temperature performance characteristics defined for the TM suffix.

Part Context

This part belongs to the DS36C278 family of low-power multipoint EIA-RS-485 transceivers. It serves as a drop-in replacement for legacy parts like the LTC485 and MAX485 while offering improved power efficiency through its CMOS architecture compared to older bipolar counterparts.

Replacement Considerations

Publicly confirmed direct replacements include the DS36C279 and DS36C280. These variants share similar pinouts but offer additional features such as automatic sleep mode or slew rate control.