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ST485EBDR

ST485EBDR

STMicroelectronics
1/1 Transceiver Half RS422, RS485 8-SOIC
Active59,190 in stock
Datasheet Digi-Key Mouser Compare Prices

Overview

The ST485EBDR is a low-power, half-duplex transceiver designed for RS-485 and RS-422 communications. It operates from a 5V supply and provides robust differential signaling over long distances in electrically noisy environments. This device is specifically engineered to support up to 256 nodes on a single bus while maintaining low power consumption of 300uA (typ.) when unloaded.

Why Choose This Part

The ST485EBDR features enhanced ESD protection and internal current limiting with thermal shutdown to prevent damage during driver overloads. Its high-impedance driver output in 3-state or power-off modes ensures the bus remains undisturbed when the device is not active.

Applications

Industrial Multipoint Networks
Connecting up to 256 transceivers on a single differential bus for factory automation and control.
Process Control Systems
Transmitting sensor data and control signals across long cable runs in half-duplex configurations.
RS-422 Point-to-Point Links
High-speed 5Mbps data transmission between dedicated industrial equipment.
HVAC Control Systems
Linking distributed thermostats and air handling units over a shared RS-485 bus.

Key Specifications

Type Transceiver
Duplex Half
Protocol RS422, RS485
Data Rate 5Mbps
Mounting Type Surface Mount
Package / Case 8-SOIC (0.154", 3.90mm Width)
Voltage - Supply 4.75V ~ 5.25V
Receiver Hysteresis 70 mV
Operating Temperature -40degC ~ 85degC
Supplier Device Package 8-SOIC
Number of Drivers/Receivers 1/1

Getting Started

To use this transceiver, connect the RO (Receiver Output) and DI (Driver Input) pins to your microcontroller's UART. Control the DE (Driver Enable) and RE (Receiver Enable) pins to toggle between transmit and receive modes. Ensure a 120-ohm termination resistor is placed at the physical ends of the RS-485 bus to minimize signal reflections.

ST485 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Temp Range Stock
ST485EBDR (this part) -40degC ~ 85degC 59,190
ST485EXDR -55degC ~ 125degC 8,096

Also Consider

MAX485ESA+ Analog Devices / Maxim Integrated - An industry-standard alternative with similar pinout and 2.5Mbps data rate for general purpose 5V RS-485 applications.
SN75176BDR TITexas Instruments - A widely available and cost-effective solution for standard differential bus communication.