ADM2861EBRNZ

Overview

The ADM2861EBRNZ is a half-duplex RS-485 transceiver featuring 5.7 kV RMS signal and power isolation with an integrated DC-to-DC converter. It supports a maximum data rate of 500 kbps for EMI control, operates on a 3 V to 5.5 V supply, and provides ±15 kV IEC ESD protection on bus pins. The device includes cable inversion capabilities, hot-swap support, and fail-safe features in a 28-lead SOIC_W package.

Feature Summary

• Integrated isolated DC-to-DC converter eliminates the need for external isolated power supplies.
• Cable invert feature corrects reversed A/B/Y/Z connections while maintaining receiver fail-safe performance.
• High common-mode transient immunity of 250 kV/µs ensures reliable operation in noisy environments.
• Passes EN 55032 Class B radiated emissions testing with margin on a standard two-layer PCB.

Applications

• Industrial field buses
• Building automation networks
• Utility networks and energy meters

Procurement Notes

Verify the specific suffix 'BRNZ' against the manufacturer's current ordering guide to confirm the tape and reel or tube packaging configuration. Ensure the component meets RoHS compliance requirements for your assembly process. Cross-reference the datasheet revision to confirm all safety approvals are active.

Selection Notes

Select this model for applications requiring low-speed (500 kbps) communication to minimize electromagnetic interference over long cable runs. Choose this variant over high-speed models when EMI compliance is critical. Verify that the logic supply voltage range matches the system controller interface levels.

Part Context

This component belongs to the ADM286xE family of isolated RS-485 transceivers. It shares the same isolation architecture and regulatory approvals as the ADM2863E, ADM2865E, and ADM2867E, differing primarily in data rate and duplex mode specifications.

Replacement Considerations

ADM2863EBRNZ: Full-duplex variant with identical 500 kbps speed and isolation ratings.

FAQ

How does the Cable Invert feature function?

The Cable Invert feature allows the user to correct reversed cable connections on the A, B, Y, and Z bus pins by toggling the INV/INVR pins, ensuring the receiver maintains full fail-safe performance despite physical wiring errors.

What is the purpose of the VSEL pin?

The VSEL pin selects the output voltage of the internal isolated DC-to-DC converter. Connecting it to VISO sets the output to 5.0 V, while connecting it to GNDISO sets the output to 3.3 V.

Does the device support hot swapping?

Yes, the ADM2861E supports full hot swap functionality, allowing glitch-free power-up and power-down without damaging the bus or the transceiver.