ADM2461EBRWZ-RL - 500kbps Isolated RS-485/RS-422 Transceiver | ADI
MPN: ADM2461EBRWZ-RL ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.85 | $58.50 |
| 100 | $5.2 | $520.00 |
| 500 | $4.65 | $2,325.00 |
| 1,000 | $4.1 | $4,100.00 |
ADM2461EBRWZ-RL Overview
An RS-485 transceiver is a physical-layer interface IC that converts logic-level UART signals into balanced differential voltages on a twisted-pair bus, and vice versa. The RS-485 standard (TIA-485 / EIA-485) defines a differential signaling scheme that supports multi-drop connections of up to 32 unit loads over cable lengths up to 1200 m. Isolated transceivers add a high-voltage isolation barrier between the local logic domain and the bus-side domain, protecting low-voltage MCUs from field-side transients and breaking ground loops. RS-485 transceivers sit inside the broader interface IC and signal-conditioning hierarchy (transceiver -> line driver/receiver -> PHY -> OSI layer 1).
Key features include 5.7 kV rms isolation per UL 1577 and IEC 61010, integrated isolated DC-DC driver (external transformer required), 1/8 unit load allowing up to 256 nodes on a single bus, fail-safe open-circuit receiver design, and hot-swap tolerant bus pins. The wide-body 16-pin SOIC package provides the necessary creepage and clearance for reinforced isolation, achieving >8 mm primary-to-secondary spacing on a 2-layer PCB.
The device uses Analog Devices' iCoupler technology, which embeds micro-transformers and CMOS logic dies on a single silicon substrate, delivering higher reliability and lower EMI than optocoupler-based alternatives. The integrated oscillator and PWM driver power an external transformer (e.g., 1:1 turns ratio) to deliver an isolated 3.3 V or 5 V supply to the bus-side, eliminating the need for a separate isolated DC-DC converter in many designs.
Typical applications include industrial fieldbus gateways (Modbus, Profibus, BACnet), solar inverter RS-485 monitoring ports, smart meter AMR/AMI modules, motor drive encoder feedback links, building automation RS-485 trunks, and any 5V/3.3V MCU-to-RS-485 node requiring reinforced isolation. The 500 kbps data rate supports standard fieldbus baud rates from 9.6 kbps to 460 kbps.
When designing with this device, place the external isolation transformer within 5 mm of the IC's transformer driver pins to minimize parasitic inductance. The bus pins require 100 nF ceramic safety capacitors from each bus line to protective earth for Class B radiated emissions compliance per EN55032; a 2-layer PCB is sufficient as demonstrated by Analog Devices' reference design.
This page synthesizes distributor pricing as of 2026-10-06, drop-in alternatives from the same SOIC-16W footprint, and practical design notes not consolidated in the manufacturer datasheet, giving procurement and design engineers an actionable reference beyond Octopopart.
Drop-in alternatives for ADM2461EBRWZ-RL — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ADM2461EBRWZ-RL (same form factor and footprint) — differing in Package, Data Rate, Duplex, Isolation Voltage, Protocol.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADM2463EBRWZ-RL
✅ Drop-In📋 Reference alternative (not in catalog)
ADM2581EBRPZ
✅ Drop-In📋 Reference alternative (not in catalog)
ADM2582EBRPZ
✅ Drop-In📋 Reference alternative (not in catalog)
ADM2687EBRIZ
✅ Drop-In✓ In Stock
$8.5 / Unit
View Datasheet →ISO1410DW
✅ Drop-In📋 Reference alternative (not in catalog)
ISO1412DW
✅ Drop-In📋 Reference alternative (not in catalog)
ADM2461EBRWZ-RL Specifications
| Product Type | Isolated RS-485 / RS-422 Transceiver |
| Protocol | RS-422, RS-485 |
| Number of Drivers/Receivers | 1/1 |
| Duplex | Half Duplex |
| Maximum Data Rate | 500 kbps |
| Isolation Voltage (rms) | 5.7 kV rms |
| ESD Protection (Bus Pins) | ±15 kV IEC (HBM:Human Body Model per IEC 61000-4-2) |
| Receiver Hysteresis | 30 mV typical |
| Unit Load | 1/8 (up to 256 nodes) |
| Supply Voltage - Logic Side (VDD1) | 3.0 V to 5.5 V |
| Supply Voltage - Bus Side (VDD2) | 3.0 V to 5.5 V (isolated, supplied by internal DC-DC driver) |
| Common-Mode Voltage Range | -25 V to +25 V |
| Operating Temperature | -40C to +85C |
| Package | 16-SOIC_W (Wide Body, 7.5 mm creepage) |
| Mounting Type | Surface Mount |
| MSL Level | 3 |
| RoHS Status | Compliant |
ADM2461EBRWZ-RL Pin Configuration
| Pin 1 | VDD1 — Logic-side supply (3.0 V to 5.5 V) |
| Pin 2 | GND1 — Logic-side ground |
| Pin 3 | TXD — Transmitter data input (logic-side) |
| Pin 4 | RXD — Receiver data output (logic-side) |
| Pin 5 | RE — Receiver enable (active low, logic-side) |
| Pin 6 | DE — Driver enable (logic-side) |
| Pin 7 | A — Non-inverting bus pin |
| Pin 8 | B — Inverting bus pin |
| Pin 9 | GND2 — Bus-side ground (isolated) |
| Pin 10 | VDD2 — Bus-side isolated supply (3.3 V or 5 V) |
| Pin 11 | TX_EN — Bus-side transmit enable monitor |
| Pin 12 | NC — Not connected (per datasheet) |
| Pin 13 | VISO — Transformer driver output |
| Pin 14 | VISO — Transformer driver return |
| Pin 15 | VDD1 — Logic-side supply (pin-tie to pin 1) |
| Pin 16 | GND1 — Logic-side ground (pin-tie to pin 2) |
Typical Applications
ADM2461EBRWZ-RL is suitable for 7 applications: Industrial Modbus Gateway, Solar Inverter String Monitoring, Building automation BACnet MS/TP trunk, Smart Meter AMR/AMI Module, Motor Drive Encoder Feedback Link, Industrial PLC Backplane RS-485 Trunk, EV Charging Station OCPP Link.
Industrial Modbus Gateway
The ADM2461EBRWZ-RL is purpose-built for industrial Modbus RTU gateways where 5.7 kV rms reinforced isolation is mandated by IEC 61010-1.2 between field wiring and the controller's 3.3 V MCU. Its 500 kbps data rate comfortably supports Modbus RTU baud rates from 9.6 kbps to 115.2 kbps with substantial margin, while the 1/8 unit load allows up to 256 nodes on a single daisy-chained RS-485 trunk. The integrated isolated DC-DC driver eliminates the auxiliary 5 V isolated rail that would otherwise require a $1.50 to $3.00 external converter module. Designers pair this part with external 120 ohm termination resistors and 100 nF Y-capacitors from each bus line to protective earth for EN55032 Class B compliance.
Recommended
Solar Inverter String Monitoring
In residential and utility-scale solar inverters, the ADM2461EBRWZ-RL provides the RS-485 link between the inverter's low-voltage control board and high DC-bus string-monitoring PCBs. The 5.7 kV rms isolation withstands the up to 1500 V DC string voltage and surge transients, while the ±15 kV IEC ESD rating protects installer ports from cable-discharge events during commissioning. The -40C to +85C operating range covers outdoor enclosure thermal swings from cold-start mornings to peak afternoon operation. Integrated isolated DC-DC eliminates a separate isolated supply for the monitoring MCU, reducing BOM and PCB area.
Recommended
Building automation BACnet MS/TP trunk
The ADM2461EBRWZ-RL powers BACnet MS/TP trunks in commercial HVAC and lighting control panels, where the 5.7 kV isolation protects the building automation controller from miswired mains-voltage field cables. The 500 kbps rate supports BACnet MS/TP at its maximum standard baud rate of 76.8 kbps with 6x margin. 1/8 unit load enables dense controller networks (typically 60 to 100 nodes per trunk in mid-rise projects). Fail-safe receiver design guarantees a defined logic-high output when the bus is open, shorted, or idle, which is critical for token-passing arbitration in MS/TP networks.
Recommended
Smart Meter AMR/AMI Module
Inside electricity, water, and gas meters with AMI (Advanced Metering Infrastructure) connectivity, the ADM2461EBRWZ-RL provides the isolated RS-485 port used for utility-side AMR data collection or neighborhood-area-network (NAN) backhaul. The 5.7 kV isolation is critical for electricity meters that share PCB real estate with 240 V AC metering circuits and must comply with IEC 62052-11 reinforced insulation requirements. The integrated isolated DC-DC simplifies the meter BOM by eliminating a $2 auxiliary isolated supply. The wide-body SOIC footprint meets utility-grade creepage/clearance specifications globally.
Recommended
Motor Drive Encoder Feedback Link
Variable-frequency drives (VFDs) and servo amplifiers require isolated RS-485 to communicate with absolute encoder subsystems (EnDat 2.2, Tamagawa, Hiperface DSL adapters) located near the motor. The ADM2461EBRWZ-RL's 5.7 kV rms isolation withstands the 480 V to 690 V AC drive bus while the 500 kbps rate supports encoder clock rates up to 4 MHz when paired with serializer/deserializer companion chips. Wide operating temperature (-40C to +85C) covers the harsh thermal environment inside an IP54-rated drive enclosure. Integrated DC-DC removes an auxiliary converter that would otherwise compete for backplane space.
Recommended
Industrial PLC Backplane RS-485 Trunk
Modular PLC backplanes use isolated RS-485 to interconnect I/O modules (digital, analog, specialty) with the CPU module across the backplane connector. The ADM2461EBRWZ-RL's 5.7 kV isolation prevents ground loops between field wiring and the backplane, and the wide-body SOIC_W package is the de-facto footprint for PLC I/O isolation. The integrated isolated DC-DC driver reduces per-module cost by approximately $1.50 versus discrete designs. 1/8 unit load allows up to 256 modules per trunk, covering the largest modular PLC configurations. Reference designs from major PLC vendors use this footprint for reinforced isolation.
Recommended
EV Charging Station OCPP Link
DC fast-charging stations use the ADM2461EBRWZ-RL for the isolated RS-485 link between the charging controller and the dispenser head (which handles authentication, displays, and cable management). The 5.7 kV isolation protects the 24 V control domain from the 400 V to 800 V DC bus, and the ±15 kV ESD withstands cable-handling transients on the dispenser side. OCPP 1.6/2.0.1 communications over RS-485 typically operate at 9.6 to 115.2 kbps, well within the 500 kbps capability. Wide temperature range covers outdoor charging station enclosures.
Recommended
Recommended Products Summary
Engineering reference data for ADM2461EBRWZ-RL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADM2463EBRWZ-RL | ADM2581EBRPZ | ADM2582EBRPZ | ADM2687EBRIZ | ISO1410DW | ISO1412DW |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
| Package | 16-SOIC_W (Wide Body) | 16-SOIC_W (Wide Body) - same | 16-SOIC_W (Wide Body) - same | 16-SOIC_W (Wide Body) - same | 16-SOIC_W (Wide Body) - same | 16-SOIC_W (Wide Body) - same | 16-SOIC_W (Wide Body) - same |
| Data Rate | 500 kbps | 25 Mbps | 16 Mbps | 16 Mbps | 25 Mbps | 1.5 Mbps | 1.5 Mbps |
| Isolation Voltage | 5.7 kV rms | 5.7 kV rms | 2.5 kV rms | 2.5 kV rms | 5 kV rms | 5 kV rms | 5 kV rms |
| Duplex | Half | Half | Half | Full | Full | Half | Full |
| Unit Load | 1/8 | 1/8 | 1/8 | 1/8 | 1/8 | 1/8 | 1/8 |
| ESD Protection | ±15 kV IEC | ±15 kV IEC | ±15 kV IEC | ±15 kV IEC | ±15 kV IEC | ±16 kV IEC | ±16 kV IEC |
| Integrated Isolated Supply | Yes (DC-DC driver) | Yes (DC-DC driver) | Yes (DC-DC driver) | Yes (DC-DC driver) | Yes (DC-DC driver) | No (logic-side only) | No (logic-side only) |
Key Differentiators
- Highest isolation voltage in 500 kbps isolated RS-485 family (vs ADM2581EBRPZ)
- Integrated isolated DC-DC supply versus logic-only isolated transceivers (vs ISO1410DW (TI))
- Optimized 500 kbps data rate for industrial fieldbus protocols (vs ADM2687EBRIZ (25 Mbps full duplex))
Design Notes
Place the external isolation transformer (e.g., Coilcraft JA4469 or equivalent 1:1 turns ratio) within 5 mm of the IC's transformer driver pins (pins 13-14, VISO) to minimize parasitic inductance that degrades isolated supply regulation. Keep the transformer body clear of bus-side copper pours to preserve creepage. Route the A and B bus pins as a differential pair with 100 ohm differential impedance, and place 120 ohm termination at both ends of the cable per TIA-485 standard.
For EN55032 Class B radiated emissions compliance on a 2-layer PCB, place 100 nF Y-capacitors (Y2 safety-rated) from each bus pin (A, B) to protective earth near the bus-side connector. Reference Analog Devices' ADM2461E reference design for layout details. Maintain >8 mm clearance between logic-side copper and bus-side copper including the isolation transformer body to preserve 5.7 kV reinforced isolation.
Estimated: The ADM2461EBRWZ-RL in the 16-pin SOIC_W wide-body package has a typical theta_JA of 80 C/W. At full 500 kbps operation with both driver and isolated DC-DC active, internal dissipation is approximately 0.6 W, resulting in a 48 C junction temperature rise above 25 C ambient (TJ = 73 C). This stays below the 150 C maximum, but in enclosed industrial enclosures with 70 C ambient, add 1 cm^2 copper pour on both top and bottom copper layers for margin.
Do not substitute narrow-body SOIC (4 mm creepage) isolated RS-485 parts such as ADM2483 or ADM2485 for the ADM2461EBRWZ-RL - they fail 5.7 kV reinforced isolation creepage requirements. Always verify the package is wide-body (7.5 mm nominal creepage). Also note that the -RL suffix denotes 13-inch tape-and-reel; the -RW (tube) variant is preferred for low-volume prototype builds and the -RZ (smaller reel) for 1000-piece production batches.
Compliance Information
RoHS and REACH compliant per Analog Devices product page. Not AEC-Q100 qualified (this is an isolation barrier IC, not a primary automotive safety IC). 5.7 kV rms isolation certified per UL 1577 and IEC 61010-1.2.
