DS36C278TN

Overview

The DS36C278TN is a low-power CMOS differential transceiver compliant with RS-485 and TIA/EIA-422-B standards. It features one driver and one receiver in an 8-pin SOIC package. The device operates at a supply voltage of +4.75V to +5.25V with a maximum quiescent current of 500 μA. It supports up to 12 nodes on the bus due to its ¼ unit load input characteristic. Key electrical parameters include a common mode range of −7V to +12V, driver output short-circuit current of ±250 mA, and receiver hysteresis of 70 mV. Thermal shutdown circuitry protects against excessive power dissipation.

Feature Summary

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

Applications

• Multipoint data transmission systems requiring RS-485 compliance
• Battery-powered industrial communication networks
• Bus interfaces supporting up to 12 nodes per line

Procurement Notes

Verify the specific suffix 'TN' against official Texas Instruments documentation to confirm package type and temperature grade. Confirm RoHS compliance status as datasheets may list variations like NOPB. Ensure the component matches the required operating temperature range for your application environment before procurement.

Selection Notes

Select this component for applications requiring half-duplex communication with a limited node count. The ¼ unit load specification allows for up to 12 nodes, which is fewer than the standard 32-node limit. Consider alternative models if higher node density is required. Verify that the 5V supply voltage aligns with the system architecture.

Part Context

This part belongs to the DS36C278 family of low-power multipoint transceivers from Texas Instruments. It serves as a drop-in replacement for legacy components such as the LTC485, MAX485, and DS75176. The device maintains compatibility with bipolar and ALS technologies while offering improved power efficiency and ruggedness against ESD damage.

Replacement Considerations

Publicly confirmed direct replacements include the LTC485, MAX485, DS75176, and DS3695. These components share similar pinouts and functional characteristics. Verify that the substitute part meets the specific ¼ unit load requirement if node count is a constraint.