ADM1491EBRZ

Overview

The ADM1491EBRZ is a full-duplex RS-485/RS-422 transceiver designed for high-speed communication in multipoint transmission lines. It supports data rates up to 16 Mbps and operates from a single 5 V power supply (4.75 V to 5.25 V). The device features ±8 kV ESD protection on I/O pins, open-circuit fail-safe logic, and thermal shutdown protection. It includes one driver and one receiver housed in a 14-lead narrow-body SOIC package. The input impedance is 12 kΩ, allowing up to 32 nodes on the bus. Operating temperature range is −40°C to +85°C.

Feature Summary

• Full-duplex operation with independent driver and receiver control
• High-speed data transmission capability up to 16 Mbps
• Integrated electrostatic discharge protection on differential pins
• Fail-safe receiver output when inputs are unconnected

Applications

• RS-485/RS-422 interface circuits
• Industrial field networks
• High data rate motor control systems
• Multipoint data transmission systems

Procurement Notes

Verify the specific ordering suffix to confirm the package type and reel configuration. The BRZ suffix indicates a 14-lead narrow-body SOIC package that is RoHS compliant. Confirm availability status as distribution channels may vary. Ensure the component matches the required industrial temperature range specifications before integration into the design.

Selection Notes

Select this component for applications requiring full-duplex communication at speeds up to 16 Mbps. It is suitable for 5 V systems needing robust ESD protection and fail-safe features. Compare against half-duplex alternatives if bidirectional simultaneous communication is not required. Verify pin compatibility with existing PCB layouts due to the 14-lead SOIC form factor.

Part Context

The ADM1491E belongs to the ADM1490E/ADM1491E family of high-speed transceivers. While the ADM1490E provides half-duplex functionality in an 8-lead package, the ADM1491E offers full-duplex capability in a 14-lead package. Both share similar electrical characteristics, including 16 Mbps speed and ESD protection, but differ in duplex mode and pin count.

Replacement Considerations

The ADM1491EBRZ-REEL7 is the tape-and-reel version of the same functional device. Other variants in the series include the ADM1490E for half-duplex applications. Cross-reference pinouts carefully when substituting with other RS-485 transceivers to ensure compatible control signals and voltage levels.