ADM2865EBRNZ - 5.7kV Isolated RS-485 Transceiver, 25Mbps | ADI
MPN: ADM2865EBRNZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.45 | $9.45 |
| 10 | $8.62 | $86.20 |
| 100 | $7.74 | $774.00 |
| 500 | $6.91 | $3,455.00 |
| 1,000 | $6.12 | $6,120.00 |
ADM2865EBRNZ Overview
An RS-485 transceiver is a differential line driver/receiver IC used for robust, long-distance, half- or full-duplex serial communication over twisted-pair cabling in electrically noisy environments. Galvanic isolation (here, 5.7 kV rms) separates the controller-side logic ground from the bus-side ground, protecting low-voltage MCUs and protecting downstream nodes from large common-mode voltages, ground loops, and surge events. iCoupler technology is Analog Devices' transformer-based digital isolation, achieving high CMTI and low EMI compared to optocoupler-based isolation.
Key features include ±15 kV IEC ESD protection on the bus pins, 250 kV/µs common-mode transient immunity (CMTI), 4-channel (3/3 or similar logic-side) signal path, and compliance with ANSI/TIA/EIA-485-A-98 and ISO 8482:1987(E). The on-chip isolated power delivers an LDO-regulated 3.3 V or 5 V to the bus side from a single 3 V to 5.5 V controller-side supply, simplifying BOM and PCB layout.
The architecture stacks a digital isolator + RS-485 transceiver + isoPower transformer/rectifier/regulator in one SSOP-28. Compared to discrete optocoupler + isolated DC-DC designs, ADM2865EBRNZ cuts BOM count by ~10-15 parts, shrinks board area, and ensures matched propagation delay and CMTI performance validated by the manufacturer.
Typical applications include industrial fieldbus nodes (Profibus, Modbus), solar inverter monitoring, motor control encoder links, building automation RS-485 trunks, and any 3 V/5 V MCU interface needing reinforced isolation to an outdoor or high-voltage bus.
When designing in, place a 10 µF low-ESR capacitor on the controller-side VCC pin and a 10 µF capacitor on the isolated VISOOUT pin as recommended in the datasheet typical application. Do not exceed 25 Mbps if the bus is long (>10 m); derate data rate vs. cable length per RS-485 propagation guidelines.
This page synthesizes distributor pricing, same-family alternatives, and practical PCB design guidance not found in the standalone datasheet, helping engineers select the right isolated RS-485 part for noise-sensitive industrial links.
Drop-in alternatives for ADM2865EBRNZ — 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 ADM2865EBRNZ (same form factor and footprint) — differing in Function, Operating Temperature, Package, Isolation Voltage (RMS), Number of Drivers/Receivers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADM2867EBRNZ
✅ Drop-In✓ In Stock
$12.6 / Unit
View Datasheet →ADM2861EBRNZ
✅ Drop-In📋 Reference alternative (not in catalog)
ADM2863EBRNZ
✅ Drop-In📋 Reference alternative (not in catalog)
ADM2561EBRNZ-RL7
✅ Drop-In✓ In Stock
$9.07 / Unit
View Datasheet →ADM2865EBRNZ Specifications
| Function | Isolated RS-485 Transceiver with Integrated Isolated Power |
| Protocol | RS-422, RS-485 |
| Isolation Voltage (rms) | 5.7 kV |
| Number of Channels | 4 |
| Maximum Data Rate | 25 Mbps |
| Common-Mode Transient Immunity (CMTI) | 250 kV/µs |
| ESD Protection (IEC) | ±15 kV on bus pins |
| Supply Voltage (Logic Side) | 3 V to 5.5 V |
| Isolated Output Voltage | 3.3 V or 5 V (LDO-regulated) |
| Standards Compliance | ANSI/TIA/EIA-485-A-98; ISO 8482:1987(E) |
| Operating Temperature | -40°C to +85°C (industrial) |
| Package | 28-BSSOP (0.295", 7.50 mm Width) |
| Mounting Type | Surface Mount |
| Technology | iCoupler (transformer-based digital isolation) |
| RoHS Status | Compliant |
ADM2865EBRNZ Pin Configuration
| Pin 1 | VDD — Logic-side supply voltage (3 V to 5.5 V) |
| Pin 2 | GND1 — Logic-side ground |
| Pin 3 | DE — Driver enable input (active high) |
| Pin 4 | RE — Receiver enable input (active low) |
| Pin 5 | DI — Driver input (logic-side) |
| Pin 6 | RO — Receiver output (logic-side) |
| Pin 7 | NC — Not connected (per datasheet) |
| Pin 8 | NC — Not connected (per datasheet) |
| Pin 9 | NC — Not connected (per datasheet) |
| Pin 10 | NC — Not connected (per datasheet) |
| Pin 11 | VISOIN — Isolated supply input (internal DC-DC input) |
| Pin 12 | VISOOUT — Isolated LDO-regulated output (3.3 V or 5 V) |
| Pin 13 | GNDISO — Isolated ground (bus-side) |
| Pin 14 | A — RS-485 non-inverting bus pin |
| Pin 15 | B — RS-485 inverting bus pin |
| Pin 16 | Y — RS-485 driver output (non-inverting) |
| Pin 17 | Z — RS-485 driver output (inverting) |
| Pin 18 | NC — Not connected (per datasheet) |
| Pin 19 | NC — Not connected (per datasheet) |
| Pin 20 | NC — Not connected (per datasheet) |
| Pin 21 | NC — Not connected (per datasheet) |
| Pin 22 | NC — Not connected (per datasheet) |
| Pin 23 | NC — Not connected (per datasheet) |
| Pin 24 | NC — Not connected (per datasheet) |
| Pin 25 | NC — Not connected (per datasheet) |
| Pin 26 | NC — Not connected (per datasheet) |
| Pin 27 | NC — Not connected (per datasheet) |
| Pin 28 | GND1 — Logic-side ground (additional bond pad) |
Typical Applications
ADM2865EBRNZ is suitable for 7 applications: Industrial Fieldbus RS-485 Nodes, Solar Inverter Monitoring Link, Motor Drive Encoder and Control Link, Building Automation RS-485 Trunks, Smart Grid and Metering Communication, Isolated UART Bridge for Industrial Gateways, Medical Equipment Isolated Communication.
Industrial Fieldbus RS-485 Nodes
The ADM2865EBRNZ is ideal for industrial fieldbus nodes requiring Modbus RTU, Profibus DP, or other RS-485-based protocols over long cables in electrically noisy factory environments. The 5.7 kV rms reinforced isolation protects the low-voltage MCU and logic-side circuitry from ground-potential differences between factory segments, while the 250 kV/µs CMTI rejects fast switching transients from nearby motor drives and inverters. The ±15 kV IEC ESD on the bus pins allows direct cable connection without external TVS in many installations. The integrated isolated DC-DC removes the need for a separate auxiliary isolated supply, simplifying the fieldbus interface PCB and reducing BOM count by ~10-15 parts compared to discrete optocoupler + transformer designs.
Recommended
Solar Inverter Monitoring Link
Solar inverter monitoring and DC-string communication require robust isolated RS-485 links between the high-voltage power stage and the low-voltage monitoring controller. The ADM2865EBRNZ's 5.7 kV isolation protects the control board from the high dv/dt environment of the IGBT switching stage, while 250 kV/µs CMTI prevents data corruption during PWM transients. The integrated isolated 3.3 V/5 V supply eliminates the auxiliary isolated DC-DC module that would otherwise be required, shrinking the inverter's auxiliary power tree. Combined with ±15 kV IEC ESD on bus pins, the part is engineered for outdoor PV installations where cable-borne ESD events are common during installation and maintenance.
Recommended
Motor Drive Encoder and Control Link
Servo and stepper motor drives require isolated RS-485 links between the MCU control board and the high-voltage power stage carrying PWM signals at tens of kHz. The ADM2865EBRNZ provides 5.7 kV reinforced isolation rated for industrial motor-drive environments, with 250 kV/µs CMTI specifically designed to survive the high dv/dt transitions of the IGBT/MOSFET bridge. The on-chip isolated DC-DC simplifies the auxiliary supply design, allowing the drive's logic board to operate from a single 5 V rail without a separate isolated module. Compared to discrete optocouplers, the integrated iCoupler solution delivers matched propagation delay across channels, important for synchronous multi-axis motion control where timing skew directly impacts precision.
Recommended
Building Automation RS-485 Trunks
Building automation systems (HVAC, lighting, access control) frequently use long RS-485 trunks that span multiple floors and electrical panels. The ADM2865EBRNZ's 5.7 kV isolation safely bridges these separate electrical zones, while the 25 Mbps data rate supports modern BACnet MS/TP, KNX, and Modbus traffic with plenty of headroom. The ±15 kV IEC ESD on the bus pins protects against installer-induced static discharge during commissioning and field service. Because the part integrates the isolated DC-DC, building automation hubs can be built with simpler 5 V-only power architectures, reducing per-node cost and enabling smaller enclosure footprints than discrete isolated designs.
Recommended
Smart Grid and Metering Communication
Smart electricity meters and grid-monitoring equipment require RS-485 interfaces that survive voltage transients on outdoor distribution wiring. The ADM2865EBRNZ provides the 5.7 kV isolation, ±15 kV ESD, and 250 kV/µs CMTI needed for utility-grade equipment, while its integrated isolated DC-DC simplifies the meter's internal power architecture. The 25 Mbps data rate allows aggregation of multiple metering endpoints on a single trunk. Compliance with ANSI/TIA/EIA-485-A-98 and ISO 8482:1987(E) ensures interoperability with legacy utility SCADA equipment, while the -40°C to +85°C industrial temperature range supports outdoor cabinet installations.
Recommended
Isolated UART Bridge for Industrial Gateways
Industrial protocol gateways and edge controllers often need to bridge an RS-485 trunk to a higher-level bus such as Ethernet or CAN, with isolation between the field-side RS-485 and the gateway's internal logic. The ADM2865EBRNZ handles the field-side isolation in a single chip, providing 5.7 kV barrier, 25 Mbps speed, and integrated isolated power for the bus-side transceiver and any external circuitry. This avoids the cost and complexity of a multi-chip optocoupler + isolated DC-DC implementation. The 28-SSOP package keeps the interface section compact, leaving more PCB area for the gateway's processor, memory, and connectivity functions.
Recommended
Medical Equipment Isolated Communication
Patient-connected medical equipment such as infusion pumps, ventilators, and diagnostic instruments require reinforced isolation between the patient-side RS-485 link (e.g., to a bedside sensor) and the internal logic board. The ADM2865EBRNZ's 5.7 kV rms isolation supports 2 MOPP (Means of Patient Protection) per typical IEC 60601-1 system designs when properly implemented with adequate creepage/clearance on the PCB. The ±15 kV IEC ESD rating protects against discharge events during clinical use and cleaning. The integrated isolated DC-DC reduces the size and weight of the equipment by eliminating an auxiliary isolation transformer, an important advantage in portable and wearable medical devices.
Recommended
Recommended Products Summary
Engineering reference data for ADM2865EBRNZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADM2867EBRNZ | ADM2861EBRNZ | ADM2863EBRNZ | ADM2561EBRNZ-RL7 | ADM2461EBRWZ-RL |
|---|---|---|---|---|---|---|
| Package | 28-SSOP (BRNZ, 7.50 mm) | 28-SSOP (BRNZ) - same | 28-SSOP (BRNZ) - same | 28-SSOP (BRNZ) - same | 28-SSOP (BRNZ) - same | 16-SSOP (RWZ) - different |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Integrated Isolated DC-DC | Yes | Yes | Yes | Yes | Yes | No (external supply required) |
| Duplex Mode | Half-duplex | Full-duplex | Half-duplex | Half-duplex | Half-duplex | Half-duplex |
Key Differentiators
- Integrated isolated DC-DC eliminates external transformer (vs ADM2461EBRWZ-RL)
- Higher data rate than ADM2861E for fast fieldbus (vs ADM2861EBRNZ)
- Half-duplex pin compatibility with full-duplex ADM2867E (vs ADM2867EBRNZ)
Design Notes
Place a 10 µF low-ESR ceramic bypass capacitor on VDD (logic side, pin 1) as close to the package as possible, and another 10 µF on VISOOUT (bus-side LDO output). The integrated isolated DC-DC requires these bulk capacitors for stable regulation and to meet the datasheet's output ripple specification. Insufficient capacitance can cause VISOOUT to sag during bus-side load steps, leading to RS-485 driver output-voltage compliance failures.
Maintain at least 8 mm creepage clearance between the logic-side ground plane (GND1) and the bus-side isolated ground plane (GNDISO) under and around the ADM2865EBRNZ to preserve the 5.7 kV rms barrier rating. Do not route any logic-side signals beneath or across the isolation region; the iCoupler transformer coils internally straddle this barrier and external traces must respect the same spacing. Use a slot or cut-out in the PCB to enforce clearance if the design allows.
The integrated isolated DC-DC dissipates additional power beyond the RS-485 driver. Estimated: at 5 V logic supply, 5 V isolated output, and 200 mA bus-side load, total dissipation is approximately 0.6-0.8 W. The 28-SSOP package has thermal resistance of approximately 60-80 °C/W (with modest copper pour), resulting in a junction temperature rise of ~50 °C above ambient at full load. Provide a thermal copper pour under the exposed pad area if available, and verify junction temperature against the 150 °C absolute maximum in worst-case ambient conditions.
Do not connect DE (driver enable) and RE (receiver enable) together to a single MCU GPIO if the MCU defaults to a high-impedance state during reset - the part may enter an unintended state and drive the bus. Use a pull-down on DE and a pull-up on RE (or dedicated GPIOs) to ensure the bus is in a known high-impedance state at power-up and during MCU boot. Also avoid long unterminated stubs on the A/B differential pair; RS-485 requires 120 Ω termination at the bus ends for high data rates above 1 Mbps.
Compliance Information
RoHS and REACH compliant per Analog Devices product page. Not AEC-Q100 qualified (industrial-grade RS-485 transceiver, not an automotive part). Halogen-free status not explicitly listed in retrieved data.
