DS36C278M/NOPB

Overview

The DS36C278M/NOPB is a low-power multipoint EIA-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 one driver and one receiver, supporting data rates up to 10 Mb/s. It provides a wide common mode range from -7V to +12V and includes thermal shutdown circuitry for fault protection. The component is housed in an 8-pin SOIC package and is rated for commercial operating temperatures ranging from 0°C to +70°C.

Feature Summary

• Guaranteed RS-485 device interoperation with 100% compliance to the standard.
• Low power CMOS design suitable for battery-powered applications.
• Built-in power-up/down glitch-free circuitry allows live insertion and displacement.
• Receiver open input fail-safe guarantees a high output state when inputs are left open.

Applications

• Multipoint data transmission systems requiring RS-485 compliance.
• Battery-powered industrial communication networks.
• Live insertion and displacement bus interfaces.

Procurement Notes

Verify the specific suffix 'M' corresponds to the SOIC-8 package and commercial temperature range (0°C to +70°C). Confirm that the NOPB designation indicates lead-free and RoHS compliance. Check the latest TI Package Option Addendum for current lifecycle status, as this part may be designated as LIFEBUY or NRND depending on the revision date.

Selection Notes

Select the DS36C278T variant if an industrial temperature range (-40°C to +85°C) is required instead of the commercial range. Consider the ¼ unit load option for applications needing more than 32 nodes on a single bus. Ensure the system voltage matches the recommended +4.75V to +5.25V operating range.

Part Context

This component belongs to the DS36C2xx series of low-power RS-485 transceivers. It serves as a drop-in replacement for parts like the LTC485, MAX485, DS75176, and DS3695. The series offers variations in temperature ratings and unit load configurations to support different node counts and environmental conditions.

Replacement Considerations

Publicly confirmed direct replacements include the LTC485, MAX485, DS75176, and DS3695. Verify pinout compatibility and electrical specifications before substitution.

FAQ

What is the guaranteed number of nodes for the DS36C278?

The DS36C278 supports up to 32 nodes on a single bus, defined as 1/4 unit load per receiver.

How does the device handle excessive power dissipation?

It incorporates on-board thermal shutdown circuitry that forces the driver outputs into a high impedance state to prevent damage during fault situations.

What is the common mode voltage range?

The driver and receiver outputs operate over a common mode range of -7V to +12V.