MAX14781EESA+T

Drivers, Receivers, Transceivers Overview

The MAX14781EESA+T is a half-duplex RS-485 transceiver in an 8-pin SO package. It operates on a 4.5V to 5.5V supply with a typical current of 1.2mA and shutdown current under 10µA. The device supports data rates up to 370kbps with ±25kV HBM ESD protection on A/B pins. It features automatic polarity correction, fail-safe circuitry ensuring logic-high output when inputs are open or shorted, and hot-swap functionality. Operating temperature range is -40°C to +85°C.

Drivers, Receivers, Transceivers Feature Summary

• Automatic polarity correction autonomously corrects miswired A and B lines during idle periods.
• Integrated high robustness protection including ±25kV HBM ESD and thermal shutdown at +175°C.
• True fail-safe receiver guarantees a logic-high output when inputs are open or shorted.
• Hot-swap capability on enable inputs prevents false transitions during live insertion or power-up.

Drivers, Receivers, Transceivers Applications

• Power Meter Networks
• HVAC Networks
• Control Systems

Drivers, Receivers, Transceivers Procurement Notes

Verify the component against official Analog Devices documentation to confirm pinout compatibility and electrical specifications. Ensure the 8-pin SO package matches the target PCB footprint. Confirm RoHS compliance status via the manufacturer's datasheet before finalizing procurement.

Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring simplified installation through automatic polarity correction. It is suitable for systems needing robust ESD protection and fail-safe operation on multipoint bus networks. Verify that the required data rate does not exceed 370kbps and that the operating environment falls within the specified temperature range.

Drivers, Receivers, Transceivers Part Context

This part belongs to the MAX14781E family of RS-485 transceivers manufactured by Analog Devices/Maxim Integrated. It is designed for bidirectional data communications on half-duplex multipoint bus transmission lines, offering integrated protection and low-power shutdown modes.

Drivers, Receivers, Transceivers Replacement Considerations

Public confirmed substitute part numbers: MAX14781EESA+TTR (Reel packaging variant).

Drivers, Receivers, Transceivers FAQ

How does the automatic polarity correction function?

The device samples voltages at the A and B inputs during an idle period (minimum 20ms) and configures the driver and receiver for the detected polarity, correcting miswired connections autonomously.

What is the fail-safe behavior of the receiver?

The receiver guarantees a logic-high output when the receiver inputs are shorted, open, or connected to a terminated transmission line with all drivers disabled.

How is the low-power shutdown mode activated?

Shutdown is initiated by driving the RE input high and the DE input low simultaneously. The device draws less than 10µA in this state.