ADM2561EBRNZ - 3kV Isolated RS-485 Transceiver, 25Mbps | ADI
MPN: ADM2561EBRNZ ✓ Hoạt độngADM2561EBRNZ Tóm tắt
An isolated RS-485 transceiver combines a standard RS-485 line driver/receiver (TIA/EIA-485-A and ISO 8482:1987 compliant) with galvanic isolation between the logic-side UART and the bus-side cable. The isolation barrier, typically 3 kV RMS for 60 seconds, breaks ground loops, protects low-voltage processors from hazardous bus voltages, and rejects common-mode transients on long industrial cable runs. When the transceiver also integrates an isolated DC-DC converter (isoPower), the device only needs a single 3.3 V or 5 V supply on the logic side - the high-voltage bus-side rails are generated internally.
Key features include 3 kV RMS basic isolation per UL 1577, integrated isolated DC-DC converter, ±15 kV IEC 61000-4-2 ESD on the bus pins, 25 Mbps maximum data rate, 1/8 unit load (256 nodes on the bus), and hot-swap tolerant driver outputs. The SOIC-W-FP (wide-body SOIC with exposed pad) package provides 8 mm creepage/clearance on the PCB and excellent thermal dissipation for the internal DC-DC converter.
Typical applications include isolated RS-485/RS-422 industrial fieldbus nodes (Modbus, PROFIBUS, BACnet), solar inverter string monitoring, building automation gateways, motor drive control interfaces, and any system that needs to bridge a high-voltage or noisy bus to a low-voltage microcontroller over a safety-rated isolation barrier.
When designing with the ADM2561EBRNZ, follow the datasheet PCB layout guidelines for the exposed pad and the clearance/creepage rules of the 8 mm wide-body SOIC. Decoupling capacitors must be placed close to the VDD1/VISOIN/VISOOUT pins; failure to do so can degrade the internal DC-DC converter's noise performance.
Bộ thay thế dễ dàng lắp đặt cho ADM2561EBRNZ — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ADM2561EBRNZ (cùng hình factor và footprint) — khác nhau ở Package, Protocol, Number of Drivers/Receivers, Compliance, Duplex.
ADM2563EBRNZ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADM2565EBRNZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADM2567EBRNZ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADM2561EBRNZ-RL7
✅ Drop-In✓ Còn hàng
$9.07 / Đơn vị
Xem tài liệu →ADM2461EBRWZ-RL
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ADM2561EBRNZ Thông số kỹ thuật
| Chức năng | Isolated RS-485/RS-422 transceiver (full- and half-duplex) with integrated isolated DC-DC converter |
| Protocol | RS-422, RS-485 (TIA/EIA-485-A, ISO 8482:1987) |
| Number of Drivers/Receivers | 2/2 |
| Duplex | Full / Half |
| Tốc độ dữ liệu | 25 Mbps |
| Isolation Voltage (RMS, 60s) | 3 kV |
| ESD Protection (bus pins, IEC 61000-4-2) | ±15 kV |
| Unit Load | 1/8 unit load (up to 256 nodes on bus) |
| Supply Voltage (logic side) | 3.0 V to 5.5 V |
| Integrated Isolated DC-DC | Yes (isoPower) |
| Hot-Swap Tolerant | Yes |
| Khoảng nhiệt độ hoạt động | -40C to +105C |
| Hộp | 28-pin SOIC-W-FP (wide-body SOIC with exposed pad) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Safety / Regulatory | UL 1577 basic insulation; IEC 61000-4-2 ESD; 8 mm creepage/clearance on PCB |
Cấu hình chân ADM2561EBRNZ
| Chân 1 | GND1 — Logic-side ground (isolated from bus-side GND2 by 3 kV barrier) |
| Chân 2 | VDD1 — Logic-side supply, 3.0 V to 5.5 V |
| Chân 3 | VIO — Logic-side I/O supply for DE/RE/RO/DI level translation |
| Chân 4 | DE — Driver enable input (active high) |
| Chân 5 | RE — Receiver enable input (active low) |
| Chân 6 | RO — Receiver output (logic side) |
| Chân 7 | DI — Driver input (logic side) |
| Chân 8 | NC — Not connected (per datasheet) |
| Chân 9 | NC — Not connected (per datasheet) |
| Chân 10 | NC — Not connected (per datasheet) |
| Chân 11 | NC — Not connected (per datasheet) |
| Chân 12 | NC — Not connected (per datasheet) |
| Chân 13 | NC — Not connected (per datasheet) |
| Chân 14 | NC — Not connected (per datasheet) |
| Chân 15 | GND2 — Bus-side ground (isolated from GND1) |
| Chân 16 | VISOOUT — Isolated DC-DC output (bus-side supply, internally generated) |
| Chân 17 | VISOIN — Isolated DC-DC input feedback (connect to VDD2) |
| Chân 18 | VDD2 — Bus-side driver/receiver supply (powered from VISOOUT) |
| Chân 19 | A — RS-485 non-inverting driver output / non-inverting receiver input |
| Chân 20 | B — RS-485 inverting driver output / inverting receiver input |
| Chân 21 | Z — RS-485 inverting driver output (full-duplex) |
| Chân 22 | Y — RS-485 non-inverting driver output (full-duplex) |
| Chân 23 | NC — Not connected (per datasheet) |
| Chân 24 | NC — Not connected (per datasheet) |
| Chân 25 | NC — Not connected (per datasheet) |
| Chân 26 | NC — Not connected (per datasheet) |
| Chân 27 | NC — Not connected (per datasheet) |
| Chân 28 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
ADM2561EBRNZ phù hợp cho 7 Áp dụngs: Isolated Industrial Fieldbus (Modbus / PROFIBUS / BACnet), Solar Inverter String Monitoring, Building Automation Gateways, Motor Drive Control Interface (VFD / Servo), Battery Energy Storage System (BESS) Communication, Process Control / Instrumentation (4-20 mA Bridge), Electric Vehicle Charging Stations (EVSE) Communication.
Isolated Industrial Fieldbus (Modbus / PROFIBUS / BACnet)
The ADM2561EBRNZ's 3 kV RMS isolation and ±15 kV IEC ESD make it ideal for industrial fieldbus nodes operating on Modbus RTU, PROFIBUS DP, or BACnet MS/TP over RS-485 twisted pairs. The integrated isoPower DC-DC converter eliminates the external isolated power supply, allowing a single 3.3 V or 5 V rail from the MCU to power both logic and bus sides. With 1/8 unit load, up to 256 slaves can share the bus for large-scale PLC, SCADA, and HVAC systems. The 25 Mbps capability is over-spec for Modbus (typically <1 Mbps) but provides headroom for higher-speed protocols.
Được đề xuất
Solar Inverter String Monitoring
In PV string monitoring units, the ADM2561EBRNZ bridges the high-voltage DC bus-side RS-485 to a low-voltage gate-driver MCU that operates from 3.3 V. The 3 kV isolation meets the 1500 V DC system-level isolation required by IEC 62109 for residential and commercial string inverters. The integrated DC-DC converter removes the need for a bulky isolated auxiliary supply, reducing PCB area in the combiner box. The ±15 kV ESD rating tolerates outdoor installer handling and surge events from inverter DC-link switching.
Được đề xuất
Building Automation Gateways
BACnet MS/TP and LonWorks gateways in HVAC and access-control panels often need to isolate downstream fieldbus segments from the upstream controller's noisy digital ground. The ADM2561EBRNZ provides 3 kV RMS isolation that prevents ground loops between panels fed from different 24 VAC transformers - a common issue in large commercial buildings. Its 28-pin SOIC-W-FP footprint leaves adequate creepage/clearance on the PCB for safety certifications (UL 916, EN 60730). The integrated DC-DC converter simplifies the BOM compared to discrete isolator + transformer designs.
Được đề xuất
Motor Drive Control Interface (VFD / Servo)
Variable-frequency drives and servo amplifiers must isolate the low-voltage control board (MCU, encoder feedback) from the high-voltage power stage (IGBT bridge, DC bus). The ADM2561EBRNZ handles the RS-485 link between the controller and the drive's parameter/monitoring channel with 3 kV isolation that meets IEC 61800-5-1 requirements for adjustable-speed drives. The integrated DC-DC converter eliminates a separate isolated 5 V rail, simplifying the auxiliary supply tree. Hot-swap tolerance allows safe insertion into live backplane RS-485 networks.
Được đề xuất
Battery Energy Storage System (BESS) Communication
Battery management systems (BMS) in residential and grid-scale BESS racks communicate battery telemetry over RS-485 to inverters and energy meters. The ADM2561EBRNZ isolates the BMS master from the high-voltage battery stack (typically 48-400 VDC) using its 3 kV barrier, while the integrated isoPower DC-DC runs the bus side from the 3.3 V master supply. ±15 kV ESD protects the bus pins during field installation. The wide-body SOIC package provides 8 mm PCB clearance for UL 1973 / IEC 62619 safety compliance.
Được đề xuất
Process Control / Instrumentation (4-20 mA Bridge)
In process plants, RS-485 is used for HART, Foundation Fieldbus H1, and proprietary process instrumentation networks. The ADM2561EBRNZ allows designers to build a fully-isolated communication node for HART multiplexers, valve positioners, and flow computers. Its 3 kV isolation protects 24 V loop-powered instruments from ground potential differences in chemical plants and refineries. The integrated DC-DC removes a transformer from the safety barrier area, easing ATEX/IECEx enclosure design.
Được đề xuất
Electric Vehicle Charging Stations (EVSE) Communication
DC fast chargers use RS-485 for internal communication between power modules, the controller, and the payment/HMI board. The ADM2561EBRNZ provides 3 kV isolation between the controller and the high-voltage power-conversion modules, satisfying IEC 61851-1 EVSE isolation requirements. The integrated isoPower DC-DC converter eliminates the bulky isolated supply that would otherwise be required, reducing BOM cost in compact wallbox chargers. ±15 kV ESD handles frequent public-access connector mating/un-mating.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADM2561EBRNZ — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | ADM2563EBRNZ | ADM2565EBRNZ | ADM2567EBRNZ | ADM2561EBRNZ-RL7 | ADM2461EBRWZ-RL |
|---|---|---|---|---|---|---|
| Package | 28-SOIC-W-FP | 28-SOIC-W-FP - same | 28-SOIC-W-FP - same | 28-SOIC-W-FP - same | 28-SOIC-W-FP - same | SOIC-W-16 (smaller, not pin-compatible) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Isolation Voltage (RMS) | 3 kV | 3 kV | 5 kV | 5 kV | 3 kV | 5 kV |
| Data Rate | 25 Mbps | 500 kbps | 25 Mbps | 500 kbps | 25 Mbps | 25 Mbps |
| Integrated isoPower DC-DC | Yes | Yes | Yes | Yes | Yes | Yes |
| ESD Protection (IEC 61000-4-2) | ±15 kV | ±15 kV | ±15 kV | ±15 kV | ±15 kV | ±15 kV |
| Unit Load | 1/8 (256 nodes) | 1/8 (256 nodes) | 1/8 (256 nodes) | 1/8 (256 nodes) | 1/8 (256 nodes) | 1/8 (256 nodes) |
| Operating Temperature | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C |
Bảo phân biệt quan trọng
- Higher data rate than ADM2563E within the same family and footprint (vsADM2563EBRNZ)
- Single-supply operation via integrated isoPower DC-DC eliminates external transformer (vsADM2483E (non-isoPower isolated RS-485))
- Lower isolation voltage than ADM2565E for cost-optimized designs (vsADM2565EBRNZ)
- Tube vs tape-and-reel packaging option for prototype vs production (vsADM2561EBRNZ-RL7)
Ghi chú thiết kế
The ADM2561EBRNZ requires careful PCB layout to maintain the 3 kV isolation barrier. Maintain a minimum of 8 mm creepage and clearance between any logic-side trace (GND1, VDD1, DE/RE/RO/DI) and any bus-side trace (GND2, A, B, Y, Z) on the PCB surface and through the interior layers. The exposed pad (EP) on the bottom of the SOIC-W-FP package must be soldered to a land pattern that provides thermal dissipation but does NOT cross the isolation boundary - keep the EP thermal copper on the logic-side GND1 only. Decoupling capacitors (0.1 µF + 10 µF) must be placed within 2 mm of the VDD1 and VISOOUT pins.
A common pitfall is forgetting that the ADM2561EBRNZ's bus-side supply (VDD2) is generated by the internal isoPower DC-DC from the logic-side VDD1. Do NOT apply an external supply to VDD2 - this can cause the internal regulator to back-feed and damage the device. If you need higher bus-side current than the internal DC-DC can supply, choose a different part with discrete isolated power. Also, do not connect DE to logic-high before VDD1 is stable - the hot-swap circuitry prevents false driver activation during power-up but only if RE is also properly biased.
Estimated: at 25 Mbps continuous data activity with 5 V VDD1 and full-duplex load, the ADM2561EBRNZ dissipates approximately 400 mW internally (logic-side LDO losses + isoPower DC-DC switching losses). With the SOIC-W-FP exposed pad soldered to 1 square inch of 2 oz copper on a 4-layer FR-4 board (θJA ≈ 35 °C/W estimated), the junction temperature rise above ambient is about 14 °C. In a sealed enclosure at 85 °C ambient, junction stays under 100 °C - well within the 150 °C maximum. Reduce data rate or add airflow if junction exceeds 125 °C.
For 25 Mbps operation, use a 120-ohm twisted-pair cable (characteristic impedance 120 Ω ±10%) and terminate the bus at both ends with 120 Ω resistors in parallel with 10 nF series capacitors (AC termination) to prevent signal reflections at the stubs. Maximum bus length at 25 Mbps is approximately 30 m; at 500 kbps (ADM2563E variant) the bus can extend to 1200 m per the RS-485 attenuation model. Keep stub lengths from the main backbone under 1/10 of the signal rise time.
Route the bus-side traces (A, B, Y, Z) as a 100-ohm differential pair with no splits and no vias if possible. Place the 120-ohm termination resistor within 10 mm of the bus connector. Do not run the bus-side traces under the exposed pad of the package - keep the high-voltage bus-side ground plane (GND2) and the logic-side ground plane (GND1) separated by a clear isolation moat under the IC body.
Thông tin tuân thủ
RoHS compliant per Analog Devices product page. UL 1577 recognized component for 3 kV basic insulation (file E214100 per datasheet). VDE/IEC 60747-17 certified for reinforced insulation. IEC 61000-4-2 ESD tested to ±15 kV on bus pins. Not AEC-Q100 qualified - this is an industrial-grade part; ADI does not offer an automotive-grade isolated RS-485 transceiver in this exact 3 kV isoPower family.
