ST490ABDR

Drivers, Receivers, Transceivers Overview

The ST490ABDR is a low-power, full-duplex high-speed RS-485 and RS-422 transceiver manufactured by STMicroelectronics. It integrates one driver and one receiver in an 8-pin SOIC surface-mount package. The device operates from a single 5V supply with a typical supply current of 5mA when unloaded or fully loaded with disabled drivers. It supports data rates up to 25Mbps. Key electrical specifications include ±4 kV ESD protection, a common mode input voltage range of -7V to 12V, and 70mV typical input hysteresis. The operating temperature range is specified from -40°C to 85°C.

Drivers, Receivers, Transceivers Feature Summary

• Integrated thermal shutdown circuitry that places driver outputs into a high-impedance state during excessive power dissipation events.
• Fail-safe receiver feature that guarantees a logic high output if both differential inputs are open-circuited.
• Driver overload protection provided by short-circuit current limiting capabilities.

Drivers, Receivers, Transceivers Applications

• RS-485 communication networks
• RS-422 communication links

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'DR' against the manufacturer's official documentation to confirm it denotes the tape-and-reel packaging format. Ensure the component matches the active status and RoHS compliance details listed in the latest datasheet revision. Cross-reference the 8-pin SOIC footprint dimensions with your PCB design library to prevent assembly errors.

Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring full-duplex operation on RS-485 or RS-422 buses. It is suitable for designs needing low power consumption under 5V supplies. Consider its fail-safe input characteristics for noise immunity in electrically noisy environments. Verify that the 25Mbps speed rating meets the system's bandwidth requirements.

Drivers, Receivers, Transceivers Part Context

This part belongs to the ST490A series of line transceivers designed for industrial communication standards. It serves as a bridge between UART interfaces and balanced transmission lines. The device is distinct from half-duplex variants by providing simultaneous transmit and receive paths.

Drivers, Receivers, Transceivers Replacement Considerations

Check for direct pin-compatible alternatives within the same family, such as the ST490A, ensuring identical electrical parameters and package dimensions. Verify that any substitute maintains the same full-duplex configuration and thermal protection features.