ADM2461EBRWZ

Overview

The ADM2461EBRWZ is a half-duplex, signal-isolated RS-485 transceiver manufactured by Analog Devices Inc. It operates at a maximum data rate of 500 kbps and provides 5.7 kV rms galvanic isolation. The device supports a primary supply voltage (VDD1) range of 1.7 V to 5.5 V and an isolated secondary supply (VDD2) range of 3.0 V to 5.5 V. It features integrated IEC ESD protection rated for ≥±12 kV contact discharge and ≥±15 kV air discharge on the bus pins. The component passes EN55032 Class B radiated emissions testing on a standard two-layer PCB and includes cable inversion logic to correct reversed A/B pin connections.

Feature Summary

• Integrated cable inversion feature allows correction of reversed A, B, Y, and Z bus pin connections while maintaining full receiver fail-safe performance.
• Provides robust immunity to noise and system-level EMC events through a high common-mode transient immunity exceeding 250 kV/µs.
• Passes EN55032 Class B radiated emissions standards with margin when implemented on a two-layer printed circuit board.
• Includes built-in electrostatic discharge protection on all RS-485 bus pins to withstand severe environmental ESD events.

Applications

• Heating, ventilation, and air conditioning (HVAC) networks
• Industrial field buses
• Building automation systems
• Utility networks

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and tape-and-reel specifications. Confirm that the procurement channel sources directly from authorized distributors or the manufacturer to ensure component authenticity. Check for any pending regulatory certifications such as DIN EN IEC 60747-17 if required for your specific regional compliance needs.

Selection Notes

Select this component for applications requiring low-speed, long-distance communication over noisy industrial environments. The flexible VDD1 input voltage range facilitates integration with various logic families. Ensure the design utilizes the wide-body SOIC_W package to maintain the specified minimum creepage and clearance distances across the isolation barrier.

Part Context

This part belongs to the ADM2461E/ADM2463E series of 500 kbps, 5.7 kV RMS signal isolated RS-485 transceivers. The ADM2461E variant specifically provides half-duplex operation, whereas the ADM2463E offers full-duplex capability. Both share identical isolation ratings, ESD protection levels, and physical packaging characteristics.

Replacement Considerations

The ADM2463EBRWZ serves as a direct functional substitute within the same family, offering full-duplex operation instead of half-duplex. Other compatible options include the ADM2491EBRWZ for higher speed requirements or the ADM2761EBRWZ for extended temperature ranges, provided interface compatibility is verified.

FAQ

How does the cable inversion feature function?

The INV pin allows the user to invert the TxD signal and the A/B receiver inputs. This corrects installation errors where the A and B bus pins are connected in reverse, ensuring the receiver maintains full fail-safe performance without requiring hardware rewiring.

What are the power supply requirements for the isolated side?

The isolated side power supply (VDD2) must be maintained between 3.0 V and 5.5 V. When powered above 4.5 V, the device meets Profibus requirements for differential output voltage.

Does the device support hot swapping?

Yes, the ADM2461EBRWZ supports full hot swap capabilities, allowing for glitch-free power-up and power-down sequences during live bus operations.