ADUM3154ARSZ - 3.75 kV SPI Isolator, 4 ch, 2 Mbps | Analog Devices
MPN: ADUM3154ARSZ ✓ פעילADUM3154ARSZ סקירה
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.
חלופות תחליף ישיר עבור ADUM3154ARSZ — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם ADUM3154ARSZ (אותו גורם צורה וטביעת רגל) — שונים ב Number of Channels, Package, Common-Mode Transient Immunity (CMTI), RoHS Status, Technology.
ADUM3154ARSZ-RL7
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
ADUM3154BRSZ
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADUM3154BRSZ-RL7
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←SI8442AB-C-IS
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←SI8422BB-D-IS
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADUM3154ARSZ מפרטים
| 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) |
| מארז | 20-SSOP (0.209", 5.30 mm width, RS-20) |
| Isolation Type | Reinforced |
| טמפרטורת פעולה | -40 °C to +125 °C |
| סוג הרכבה | Surface Mount |
| רמת MSL | 3 (168 hours) |
| סטטוס RoHS | ROHS3 Compliant |
| REACH Status | REACH Unaffected |
| Safety Approvals | UL, VDE (per datasheet) |
תצורת פינים של ADUM3154ARSZ
| פין 1 | VDD1 — Side 1 supply voltage |
| פין 2 | GND1 — Side 1 ground reference |
| פין 3 | SCLK — SPI clock input (high-speed) |
| פין 4 | MOSI — SPI master-out / slave-in data (high-speed) |
| פין 5 | MISO — SPI master-in / slave-out data (high-speed) |
| פין 6 | SS — SPI slave-select input (high-speed) |
| פין 7 | ADDR0 — Low-speed address bus bit 0 (250 kbps) |
| פין 8 | ADDR1 — Low-speed address bus bit 1 (250 kbps) |
| פין 9 | NC — Not connected (per datasheet) |
| פין 10 | NC — Not connected (per datasheet) |
| פין 11 | GND2 — Side 2 ground reference |
| פין 12 | OUT_SS — Isolated slave-select output (high-speed) |
| פין 13 | OUT_MOSI — Isolated MOSI output to slave (high-speed) |
| פין 14 | OUT_MISO — Isolated MISO input from slave (high-speed) |
| פין 15 | OUT_SCLK — Isolated SPI clock output to slave (high-speed) |
| פין 16 | SS_OUT_x — Subordinate select output to addressed slave |
| פין 17 | NC — Not connected (per datasheet) |
| פין 18 | NC — Not connected (per datasheet) |
| פין 19 | GND2 — Side 2 ground reference |
| פין 20 | VDD2 — Side 2 supply voltage |
יישומים טיפוסיים
ADUM3154ARSZ מתאים עבור 6 יישוםs: 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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור ADUM3154ARSZ — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | 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 |
מבדילים עיקריים
- Integrated 4-to-1 slave-select multiplexer (לעומתSI8442AB-C-IS)
- Higher isolation voltage rating (לעומתSI8422BB-D-IS)
- Drop-in 10 Mbps speed upgrade (לעומתADUM3154BRSZ)
הערות תכנון
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.
מידע על תאימות
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.
