MAX22025FAWA+T

Drivers, Receivers, Transceivers Overview

The MAX22025FAWA+T is a compact, isolated half-duplex RS-485/RS-422 transceiver featuring Maxim’s proprietary AutoDirection control. It provides 3.5kVRMS of digital galvanic isolation between the UART side and the cable side. The device operates with a VDDA supply range of 1.71V to 5.5V and a VDDB supply range of 4.75V to 5.25V. It supports data rates up to 0.5Mbps with slew-rate limited drivers or up to 16Mbps with non-limited drivers. The receiver includes failsafe functionality for open or shorted inputs. ESD protection on driver outputs and receiver inputs withstands ±10kV (HBM). The component is housed in an 8-pin wide SOIC package and operates over a temperature range of -40°C to +85°C.

Drivers, Receivers, Transceivers Feature Summary

• Integrated AutoDirection circuitry eliminates the need for separate DE and RE control signals by automatically managing driver and receiver states based on TXD input and bus voltage.
• Provides robust communication through high-level integration including ±10kV HBM ESD protection on A/B pins and a failsafe receiver that prevents fault transitions during input shorts or opens.
• Ensures signal integrity across isolation barriers using internal high-voltage capacitors while maintaining a compact footprint with 5.5mm creepage distance.

Drivers, Receivers, Transceivers Applications

• Utility Meters
• Industrial Automation Equipment
• Programmable Logic Controllers
• HVAC Systems

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging when sourcing this part number. Confirm RoHS compliance status via the manufacturer's official documentation. Ensure the ordering code matches the exact isolation rating and data rate requirements for the target application design.

Drivers, Receivers, Transceivers Selection Notes

Select the MAX22025F variant specifically if failsafe receiver operation is required to maintain a logic high state during bus faults. Choose this model over non-isolated alternatives when ground potential differences exceed safe limits. Verify that the 1.71V minimum VDDA requirement aligns with the system's available logic power rails.

Drivers, Receivers, Transceivers Part Context

This component belongs to the MAX22025-MAX22028/MAX22025F-MAX22028F family of isolated transceivers. The 'F' designation denotes the inclusion of failsafe receiver features. The 'W' indicates the 8-pin wide SOIC package format, which facilitates higher isolation voltages compared to standard packages.

Drivers, Receivers, Transceivers Replacement Considerations

Direct functional replacements within the same family include MAX22026FAWA+T, MAX22027FAWA+T, and MAX22028FAWA+T. These variants share identical pinouts and isolation characteristics but differ in maximum data rate capabilities or receiver output behavior during transmission.

Drivers, Receivers, Transceivers FAQ

How does the AutoDirection feature simplify interface design?

AutoDirection uses an internal state machine to automatically enable or disable the driver and receiver based on the TXD input and the differential voltage on the bus, removing the need for external DE and RE control signals.

What is the difference between the MAX22025F and MAX22025 receivers?

The MAX22025F includes a failsafe receiver that guarantees a logic-high output when the receiver inputs are shorted, open, or connected to a terminated line with all drivers disabled, whereas the standard MAX22025 does not guarantee this state.

What isolation voltage ratings does the MAX22025FAWA+T support?

The device supports a maximum working isolation voltage (VIOWM) of 445VRMS, a maximum repetitive peak isolation voltage (VIORM) of 630VP, and withstands 3500VRMS for 60 seconds.