DS36C278TM

Overview

The DS36C278 is a low-power CMOS differential transceiver compliant with the RS-485 standard and compatible with TIA/EIA-422-B. It features a 1/4 unit load input, supporting up to 12 nodes on a multipoint bus. The device operates at a supply voltage of +5V (range +4.75V to +5.25V) with a maximum quiescent current of 500 μA. It provides a wide common mode range from -7V to +12V and includes thermal shutdown circuitry for fault protection. Available in SOIC and PDIP packages, it supports half-duplex data transmission.

Feature Summary

• Low power CMOS design minimizes energy consumption for battery-powered applications
• Built-in thermal shutdown protects the device during excessive power dissipation or faults
• 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 requiring RS-485 compliance
• Battery-powered industrial equipment and portable devices
• Bus interfaces in environments with high electromagnetic interference
• Systems requiring live insertion and displacement of transceivers

Procurement Notes

Verify the specific package variant (SOIC or PDIP) and temperature rating required for your application. Confirm RoHS compliance status as manufacturing processes may vary by region. Check for lifetime buy availability if long-term production support is needed. Ensure proper ESD handling procedures are followed during storage and assembly.

Selection Notes

Select the DS36C278 for applications requiring a 1/4 unit load to maximize node count up to 12 devices. Choose this component over standard unit load devices when higher bus density is necessary without adding repeaters. Verify that the operating temperature range meets the environmental conditions of the deployment site.

Part Context

This component belongs to the DS36C2xx series of low-power RS-485 transceivers manufactured by Texas Instruments. It serves as a drop-in replacement for legacy parts like the LTC485 and MAX485. The series offers variations such as the DS36C279 and DS36C280 with additional features like sleep modes or slew rate control.

Replacement Considerations

Publicly confirmed direct replacements include the LTC485, MAX485, DS75176, and DS3695. These components share similar pinouts and functional characteristics, allowing for potential interchangeability in existing designs without major circuit modifications.