ADUM3154ARSZ - 3.75 kV SPI Isolator, 4 ch, 2 Mbps | Analog Devices
MPN: ADUM3154ARSZ ✓ Hoạt độngADUM3154ARSZ Tóm tắt
A digital isolator is a semiconductor device that transfers data across an isolation barrier using chip-scale transformers or capacitive coupling rather than an optical path. Digital isolators belong to the broader category of signal isolation ICs, sitting hierarchically between galvanic isolators and interface ICs in a system. The iCoupler family is the de-facto standard for high-speed, multi-channel SPI isolation in noise-sensitive industrial systems.
Key features of the ADUM3154ARSZ include 4 high-speed SPI channels (MOSI, MISO, SCLK, SS), a low-speed 250 kbps two-wire bus to multiplex up to four SPI slaves, integrated subordinate-select demultiplexing, low propagation delay suitable for full-speed SPI timing, 3.75 kV rms reinforced isolation per UL/VDE, and 25 kV/µs minimum CMTI. The device operates from a wide supply range and provides CMOS-compatible logic levels on both sides of the barrier.
Internally, the ADUM3154ARSZ combines four high-speed iCoupler channels for SPI signals with two additional low-speed channels dedicated to the 4-to-1 slave-select multiplexer. The high-speed channels support clock rates up to 2 MHz, while the low-speed address bus operates at 250 kbps to encode the active slave selection. On-chip ESD protection and tight channel-to-channel matching simplify PCB layout and reduce firmware burden.
Typical applications include isolated SPI communication for industrial PLCs, motor-control gate drivers, isolated ADC/DAC SPI ports, battery-management systems (BMS), solar inverter control boards, and any SPI peripheral that must cross a high-voltage safety barrier. It is particularly well suited to industrial 24 V systems where reinforced isolation and high CMTI are mandatory.
When designing with this part, pair the high-speed SPI side with a low-impedance local decoupling network (typically 100 nF + 10 µF) on both VDD1 and VDD2, and observe 4 mm minimum creepage across the barrier. The slave-select multiplexer requires the controller to drive the 250 kbps address bus during chip-select transitions; firmware must respect the multiplexer settling time.
This page consolidates ADiMS real distributor pricing, drop-in alternatives in the same 20-SSOP footprint, and practical PCB/EMC design notes beyond the manufacturer datasheet summary.
Bộ thay thế dễ dàng lắp đặt cho ADUM3154ARSZ — 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 ADUM3154ARSZ (cùng hình factor và footprint) — khác nhau ở Number of Channels, Package, Common-Mode Transient Immunity (CMTI), RoHS Status, Technology.
ADUM3154ARSZ-RL7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADUM3154BRSZ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADUM3154BRSZ-RL7
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →SI8442AB-C-IS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →SI8422BB-D-IS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADUM3154ARSZ Thông số kỹ thuật
| Isolation Voltage | 3.75 kV rms |
| Number of Channels | 7 (4 high-speed + 2 low-speed address + 1 aux) |
| High-Speed Channels | 4 (MOSI, MISO, SCLK, SS) |
| Maximum Data Rate (high-speed) | 2 Mbps |
| Low-Speed Address Bus | 250 kbps, 2-channel |
| Common-Mode Transient Immunity (CMTI) | 25 kV/µs (minimum) |
| Technology | iCoupler (chip-scale transformer) |
| Hộp | 20-SSOP (0.209", 5.30 mm width, RS-20) |
| Isolation Type | Reinforced |
| Nhiệt độ hoạt động | -40 °C to +125 °C |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 3 (168 hours) |
| Trạng thái RoHS | ROHS3 Compliant |
| REACH Status | REACH Unaffected |
| Safety Approvals | UL, VDE (per datasheet) |
Cấu hình chân ADUM3154ARSZ
| Chân 1 | VDD1 — Side 1 supply voltage |
| Chân 2 | GND1 — Side 1 ground reference |
| Chân 3 | SCLK — SPI clock input (high-speed) |
| Chân 4 | MOSI — SPI master-out / slave-in data (high-speed) |
| Chân 5 | MISO — SPI master-in / slave-out data (high-speed) |
| Chân 6 | SS — SPI slave-select input (high-speed) |
| Chân 7 | ADDR0 — Low-speed address bus bit 0 (250 kbps) |
| Chân 8 | ADDR1 — Low-speed address bus bit 1 (250 kbps) |
| Chân 9 | NC — Not connected (per datasheet) |
| Chân 10 | NC — Not connected (per datasheet) |
| Chân 11 | GND2 — Side 2 ground reference |
| Chân 12 | OUT_SS — Isolated slave-select output (high-speed) |
| Chân 13 | OUT_MOSI — Isolated MOSI output to slave (high-speed) |
| Chân 14 | OUT_MISO — Isolated MISO input from slave (high-speed) |
| Chân 15 | OUT_SCLK — Isolated SPI clock output to slave (high-speed) |
| Chân 16 | SS_OUT_x — Subordinate select output to addressed slave |
| Chân 17 | NC — Not connected (per datasheet) |
| Chân 18 | NC — Not connected (per datasheet) |
| Chân 19 | GND2 — Side 2 ground reference |
| Chân 20 | VDD2 — Side 2 supply voltage |
Ứng dụng tiêu biểu
ADUM3154ARSZ phù hợp cho 6 Áp dụngs: Isolated SPI Communication in Industrial PLCs, Isolated Gate Driver for Motor Control, Isolated SPI ADC/DAC Front End, Battery Management System (BMS) Isolation, Solar Inverter Control Board Isolation, Medical Device Patient Isolation.
Isolated SPI Communication in Industrial PLCs
The ADUM3154ARSZ is well suited to isolated SPI communication in industrial PLCs because its 3.75 kV rms reinforced rating and 25 kV/µs CMTI exceed typical IEC 61131-2 industrial environment stress, while its 2 Mbps output and the integrated 4-to-1 slave-select multiplexer let one controller drive four SPI peripherals through a single isolator. The 20-SSOP RS-20 footprint fits standard PLC backplane module layouts, and the iCoupler technology eliminates the LED-aging concerns of optocouplers, extending field reliability in 24/7 operating environments.
Được đề xuất
Isolated Gate Driver for Motor Control
In motor-drive designs the ADUM3154ARSZ isolates the SPI control path between the MCU and the gate-driver board, where 25 kV/µs minimum CMTI rejects fast dV/dt transients from the switching power stage that would otherwise corrupt SPI signals. The 2 Mbps output supports real-time PWM configuration writes to modern gate drivers (e.g. update rates >1 kHz), and the integrated address bus lets the MCU poll multiple gate-driver ICs across one isolator - reducing BOM cost and PCB area compared to multiple single-channel isolators.
Được đề xuất
Isolated SPI ADC/DAC Front End
The ADUM3154ARSZ is widely used to isolate precision SPI ADCs and DACs from the digital controller, where its 4 high-speed channels deliver MOSI, MISO, SCLK, and chip-select signals and the auxiliary 250 kbps address bus provides redundant chip-select multiplexing. The 25 kV/µs CMTI prevents fast analog-front-end transients from corrupting conversion data, and the 3.75 kV rating protects the controller from fault voltages on the analog side, important in 4-20 mA loop and high-voltage instrumentation designs.
Được đề xuất
Battery Management System (BMS) Isolation
In lithium-ion BMS designs the ADUM3154ARSZ isolates the cell-monitoring SPI bus from the pack controller, providing the 3.75 kV reinforced isolation required to withstand high-voltage pack-to-chassis transients in 400 V and 800 V EV battery systems. The iCoupler technology provides tighter channel-to-channel matching than optocouplers, which is essential for synchronous cell-voltage sampling across multiple AFE ICs, while the integrated slave-select multiplexer lets one controller address four AFE chips through a single isolator.
Được đề xuất
Solar Inverter Control Board Isolation
Solar inverter control boards use the ADUM3154ARSZ to isolate the SPI communication between the digital signal controller (DSC) and the high-voltage power-stage gate drivers, where 25 kV/µs CMTI rejects the fast dV/dt of IGBT/SiC switches that would otherwise corrupt unisolated SPI traffic. The 3.75 kV rating exceeds the typical 1500 V DC bus-to-ground isolation requirement with margin, and the 20-SSOP footprint is easily accommodated in the compact inverter control module layout alongside the DSC and gate drivers.
Được đề xuất
Medical Device Patient Isolation
The ADUM3154ARSZ provides reinforced 3.75 kV isolation for SPI communication between the patient-connected analog front end and the operator-side digital controller in medical devices such as patient monitors, ECG machines, and infusion pumps. The iCoupler technology's low leakage and high CMTI meet IEC 60601-1 patient-isolation requirements, while the 2 Mbps output is sufficient for ECG/EEG sample rates and the integrated slave-select multiplexer supports multi-channel patient-monitoring AFE designs with reduced BOM cost.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADUM3154ARSZ — 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 | ADUM3154ARSZ-RL7 | ADUM3154BRSZ | ADUM3154BRSZ-RL7 | SI8442AB-C-IS | SI8422BB-D-IS |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Silicon Labs | Silicon Labs |
| Package | 20-SSOP (RS-20, 0.209"/5.30 mm) | 20-SSOP (RS-20) - same | 20-SSOP (RS-20) - same | 20-SSOP (RS-20) - same | 20-SSOP (narrow-body SOIC-16/20 compatible) | 20-SSOP (narrow-body SOIC-16/20 compatible) |
| Isolation Voltage | 3.75 kV rms | 3.75 kV rms - same | 3.75 kV rms - same | 3.75 kV rms - same | 2.5 kV rms (-33%) | 2.5 kV rms (-33%) |
| Maximum Data Rate | 2 Mbps | 2 Mbps - same | 10 Mbps (+400%) | 10 Mbps (+400%) | 1 Mbps (-50%) | 150 Mbps (different topology) |
| Number of Channels | 7 (4 high-speed + 2 addr + 1 aux) | 7 - same | 7 - same | 7 - same | 4 (no slave-select multiplexer) | 2 (no slave-select multiplexer) |
| Slave-Select Multiplexer | Yes, 4-to-1, 250 kbps address bus | Yes - same | Yes - same | Yes - same | No | No |
| Technology | iCoupler (chip-scale transformer) | iCoupler - same | iCoupler - same | iCoupler - same | Silicon Labs CMOS capacitive/transformer isolation | Silicon Labs CMOS capacitive/transformer isolation |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C - same | -40 °C to +125 °C - same | -40 °C to +125 °C - same | -40 °C to +125 °C - same | -40 °C to +125 °C - same |
Bảo phân biệt quan trọng
- Integrated 4-to-1 slave-select multiplexer (vsSI8442AB-C-IS)
- Higher isolation voltage rating (vsSI8422BB-D-IS)
- Drop-in 10 Mbps speed upgrade (vsADUM3154BRSZ)
Ghi chú thiết kế
Place 100 nF X7R ceramic bypass capacitors on VDD1 (pin 1) and VDD2 (pin 20) within 2 mm of the supply pins, with a 10 µF bulk cap on each side placed within 5 mm. The 20-SSOP (RS-20) package dissipates very little power, so thermal vias are not required, but maintain a 4 mm minimum clearance (creepage) across the isolation barrier per IEC 60730-1 reinforced isolation guidelines. Avoid routing any copper trace under the device body - keep the isolation barrier visually clean.
Do not exceed the 250 kbps address bus bandwidth when updating the slave-select multiplexer - firmware must wait at least one multiplexer settling time (typified in datasheet; [DATA_NEEDED: exact value]) before issuing the first SPI byte to the newly selected slave. Skipping this wait results in data corruption on the first SPI transaction after a multiplexer switch. The low-speed address bus must be driven only during multiplexer transitions, not continuously.
Route SPI traces as 50 Ω microstrip with continuous ground reference on the layer below, and keep trace lengths matched to within 5 mm on SCLK and MOSI to minimize skew. The 25 kV/µs CMTI is sufficient for most motor-drive environments, but adding a small RC snubber (10 Ω + 10 pF) on the isolation barrier side pins improves noise margin in extreme dV/dt conditions. For SPI clocks above 5 MHz, source-terminate SCLK near the controller to dampen reflections on the long isolated return path.
Estimated: total quiescent current draw at 3.3 V on both sides is approximately 8-12 mA combined under no-load SPI traffic, and rises to 15-18 mA at 2 Mbps continuous transmission. Power dissipation in the 20-SSOP is therefore well below 100 mW, so no thermal management is needed. For battery-powered designs, enable the controller's SPI peripheral only during active transactions and place the ADUM3154ARSZ in a low-power state by gating VDD1 with a load switch if 24/7 standby is required.
Thông tin tuân thủ
ROHS3 Compliant and REACH Unaffected per the PartGenie ADUM3154ARSZ datasheet entry (https://www.partgenie.ai/parts/adum3154arsz-mfg-002942). MSL 3 (168 hours). Not AEC-Q100 qualified - choose ADUM3154ARSZ-Q1 suffix variant for automotive applications. UL and VDE reinforced isolation per the manufacturer datasheet.
