MAX22027AWA+T

Drivers, Receivers, Transceivers Overview

The MAX22027AWA+T is a compact, isolated half-duplex RS-485/RS-422 transceiver featuring 3.5kVRMS digital galvanic isolation between the UART and cable sides. It supports data rates up to 0.5Mbps with slew-rate limited drivers to minimize EMI. The device incorporates AutoDirection control to eliminate external driver-enable signals. Electrical specifications include VDDA operating from 1.71V to 5.5V and VDDB from 4.75V to 5.25V. Driver propagation delay ranges from 200ns to 1000ns, while receiver propagation delay is typically 80ns. Common-mode transient immunity is rated at 50kV/μs. The component operates within a temperature range of -40°C to +85°C and is housed in an 8-pin wide SOIC package.

Drivers, Receivers, Transceivers Feature Summary

• Integrated AutoDirection circuitry automatically manages driver and receiver states based on TXD input and bus voltage.
• Slew-rate limited driver outputs reduce electromagnetic interference and signal reflections for error-free transmission.
• Receiver output always follows the differential bus voltage (VA-VB) during active driving states.
• Built-in ±10kV electrostatic discharge protection on driver outputs and receiver inputs.

Drivers, Receivers, Transceivers Applications

• Isolated RS-485 communication ports
• Utility meters
• Industrial automation equipment
• Programmable logic controllers
• HVAC systems

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'WA+T' against official documentation to confirm tape-and-reel packaging and RoHS compliance status. Confirm that the selected variant matches the required 0.5Mbps data rate specification. Ensure the design accounts for the separate power domains required for the UART and cable sides.

Drivers, Receivers, Transceivers Selection Notes

Select this model when a reduced slew rate is necessary to minimize EMI or prevent reflections on improperly terminated cables. Choose this part over non-slew-limited variants if the application requires a maximum data rate of 0.5Mbps. Verify compatibility with the required isolation voltage ratings for the specific system ground potential differences.

Drivers, Receivers, Transceivers Part Context

This component belongs to the MAX22025-MAX22028 family of isolated transceivers. It shares the same physical package and isolation architecture as other members but differs in electrical characteristics such as data rate limits and receiver behavior during driver enable states.

Drivers, Receivers, Transceivers Replacement Considerations

The MAX22025AWA+T serves as a functional substitute within the same family, sharing identical pinouts and isolation features. Differences exist primarily in data rate capabilities and receiver output behavior during transmission.