ADUM3153ARSZ - 7-Ch SPI Isolator, 3.75kVrms, 17MHz | ADI
MPN: ADUM3153ARSZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.42 | $6.42 |
| 10 | $5.78 | $57.80 |
| 100 | $5.14 | $514.00 |
| 500 | $4.59 | $2,295.00 |
| 1,000 | $4.05 | $4,050.00 |
ADUM3153ARSZ Overview
A digital isolator is a semiconductor device that transfers logic-level signals across a galvanic isolation barrier using chip-scale transformers (iCoupler technology), optocouplers, or capacitive coupling, while blocking high voltage DC and transient common-mode events. Within the power management and signal chain hierarchy, digital isolators sit between interface ICs and discrete optocouplers, replacing legacy optocouplers in industrial, medical, and renewable energy systems where board space, speed, and CMTI matter more than absolute lowest cost.
Key features of the ADUM3153ARSZ include three isolated data channels (up to 17 MHz), four additional slower auxiliary channels for handshake and control, integrated transformer coils that eliminate external gate drivers, and 8 mm creepage/clearance on the 20-SSOP wide-body package. The chip scale transformer technology eliminates the LED degradation and current-transfer-ratio (CTR) drift that limit optocoupler lifetimes.
Architecturally, the ADUM3153 family uses Analog Devices' iCoupler chip-scale transformer technology. The CLK, MO/SI, MI/SO, and SS data channels are designed for matched low propagation delay (14 ns typical), while three auxiliary channels support the SPI handshake (chip select, busy, interrupt) at lower data rates. Power-on default output state is low; VDD1 and VDD2 supply ranges are independently 3.0 V to 5.5 V.
Typical applications include isolated SPI interfaces to gate drivers and power modules in industrial motor drives and solar inverters, isolated ADC front ends for power metering and instrumentation, SPI-isolated communication to DSPs and microcontrollers in medical patient monitors, and SPI bus extension across 5 kV reinforced isolation barriers in PLC and process control I/O modules.
When designing with this device, ensure VDD1 and VDD2 bypass capacitors (0.1 µF ceramic minimum) are placed within 2 mm of each supply pin, and that PCB creepage meets the end-equipment reinforced insulation standard (typically 8 mm). The device does not require external clock generation or pull-up resistors, simplifying layout versus discrete optocoupler solutions.
This page synthesizes distributor pricing, drop-in alternatives from the same ADuM315x family and competitor isolators, and practical PCB layout notes not found in the manufacturer datasheet, helping engineers select the right 7-channel SPI isolator for high-voltage industrial designs.
Drop-in alternatives for ADUM3153ARSZ — 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 ADUM3153ARSZ (same form factor and footprint) — differing in Package, RoHS Status, Operating Temperature, Propagation Delay, Technology.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADUM3153BRSZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.35 / Unit
View Datasheet →ADUM3152ARSZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.8 / Unit
View Datasheet →ADUM3151ARSZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADUM3153ARSZ Specifications
| Isolation Voltage | 3750 Vrms |
| Number of Channels | 7 |
| Data Rate (high-speed channels) | 2 Mbps nominal; 17 MHz SPI clock supported |
| Propagation Delay | 14 ns typical |
| Common-Mode Transient Immunity (CMTI) | 25 kV/µs |
| Supply Voltage VDD1/VDD2 | 3.0 V to 5.5 V |
| Channel Directionality (high-speed) | 3 forward, 1 reverse (configurable) |
| Auxiliary Channel Count | 3 (0/3 direction options) |
| Operating Temperature | -40 °C to +125 °C |
| Package | 20-SSOP (0.209 inch / 5.30 mm body width) |
| Mounting Type | Surface Mount |
| Technology | iCoupler chip-scale transformer |
| RoHS Status | Compliant |
ADUM3153ARSZ Pin Configuration
| Pin 1 | VDD1 — Supply voltage for side 1 (3.0 V to 5.5 V) |
| Pin 2 | GND1 — Ground reference for side 1 |
| Pin 3 | VI_A — Auxiliary channel input (side 1) |
| Pin 4 | VO_A — Auxiliary channel output (side 2) |
| Pin 5 | VI_B — Auxiliary channel input (side 1) |
| Pin 6 | VO_B — Auxiliary channel output (side 2) |
| Pin 7 | VI_C — Auxiliary channel input (side 1) |
| Pin 8 | VO_C — Auxiliary channel output (side 2) |
| Pin 9 | GND1 — Ground reference for side 1 (duplicate) |
| Pin 10 | VI_SS — SPI chip select input (side 1) |
| Pin 11 | VO_SS — SPI chip select output (side 2) |
| Pin 12 | VI_CLK — SPI clock input (side 1) |
| Pin 13 | VO_CLK — SPI clock output (side 2) |
| Pin 14 | VI_MO — SPI master out input (side 1) |
| Pin 15 | VO_MO — SPI master out output (side 2) |
| Pin 16 | VI_MI — SPI master in input (side 1) |
| Pin 17 | VO_MI — SPI master in output (side 2) |
| Pin 18 | GND2 — Ground reference for side 2 |
| Pin 19 | VDD2 — Supply voltage for side 2 (3.0 V to 5.5 V) |
| Pin 20 | NC — Not connected (per datasheet) |
Typical Applications
ADUM3153ARSZ is suitable for 6 applications: Isolated SPI Gate Driver for Motor Drives, Solar Inverter SPI Communication Isolation, Medical Patient Monitor Signal Isolation, PLC Digital I/O Module SPI Isolation, Isolated DSP/FPGA SPI Interface for Instrumentation, Isolated Power Meter ADC Interface.
Isolated SPI Gate Driver for Motor Drives
The ADUM3153ARSZ fits industrial motor drive gate-driver isolation because its 3750 Vrms isolation meets IEC 61800-5-1 reinforced insulation for 600 V AC drives. Its SPI-optimized 14 ns propagation delay across CLK, MO, MI, and SS signals preserves timing margins when driving IGBT modules through digital gate drivers like the ADuM4135 or UCC21750. The 25 kV/µs CMTI prevents data corruption from SiC MOSFET edges (100 kV/µs in practice) at the high-voltage DC bus. Used between the control MCU (3.3 V domain) and the inverter stage (5 V or 15 V domain) with 0.1 µF VDD bypass caps placed within 2 mm of each supply pin.
Recommended
Solar Inverter SPI Communication Isolation
The ADUM3153ARSZ isolates SPI communication between the control board and power stage in solar inverter designs up to 1500 V DC. Its 7 channels carry SPI clock, data, and three handshake lines (busy, fault, interrupt) needed to coordinate MPPT controller, gate driver, and ADC chips across the reinforced isolation barrier. The 17 MHz SPI clock supports real-time telemetry from the inverter's digital control loop without timing penalties. Designers add TVS diodes at each isolator supply pin and route the high-voltage-side ground as a separate plane to maintain 8 mm creepage per IEC 62109.
Recommended
Medical Patient Monitor Signal Isolation
In medical patient monitors, the ADUM3153ARSZ provides 3750 Vrms patient-to-operator isolation per IEC 60601-1, isolating SPI-connected sensor front ends (ECG, SpO2, temperature) from the host display processor. The chip-scale transformer iCoupler technology eliminates the LED aging and CTR drift that plague optocouplers in continuous-monitoring equipment. The 7-channel count supports one full SPI port plus three GPIO lines for sensor enable and fault signals. Total creepage of 8 mm on the 20-SSOP wide-body package satisfies 2500 V AC working voltage requirements for patient-connected circuits.
Recommended
PLC Digital I/O Module SPI Isolation
Programmable Logic Controller (PLC) digital I/O modules use the ADUM3153ARSZ to isolate field-side SPI peripherals (digital I/O expanders, ADCs, DACs) from the backplane logic at 24 V DC field voltages. The 25 kV/µs CMTI tolerates ESD and motor back-EMF events common in factory automation environments. The 7-channel architecture carries SPI plus three handshake signals needed for handshake-based I/O protocols. Used in 8-channel or 16-channel digital input cards alongside TVS protection on field-side wiring.
Recommended
Isolated DSP/FPGA SPI Interface for Instrumentation
Test and measurement instrumentation uses the ADUM3153ARSZ to isolate SPI peripherals (precision ADCs, DACs, references) from sensitive DSP or FPGA controllers when high common-mode voltages appear at the test terminals. The 14 ns matched propagation delay across SPI signals preserves the deterministic timing needed for phase-coherent measurements in oscilloscopes and spectrum analyzers. The 3.0 V to 5.5 V supply range on each side accommodates both legacy 5 V analog ICs and modern 3.3 V FPGAs. Eight-millimeter wide-body SSOP provides the creepage needed for CAT II 300 V measurement categories.
Recommended
Isolated Power Meter ADC Interface
Three-phase power meters isolate SPI-connected energy-measurement ADCs from the meter's host MCU using the ADUM3153ARSZ. The 7-channel count supports full SPI communication plus isolated fault and zero-crossing detection channels needed for revenue-accurate metering per IEC 62053-22. The 25 kV/µs CMTI ensures SPI data integrity when switching the meter's internal relay load. Operating temperature of -40 °C to +125 °C suits outdoor smart meter installations where ambient temperatures can exceed 85 °C in direct sun exposure.
Recommended
Recommended Products Summary
Engineering reference data for ADUM3153ARSZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADUM3153BRSZ | ADUM3152ARSZ | ADUM3151ARSZ | SI8622BB-B-IS |
|---|---|---|---|---|---|
| Package | 20-SSOP (5.30 mm wide body) | 20-SSOP (5.30 mm) - same | 20-SSOP (5.30 mm) - same | 20-SSOP (5.30 mm) - same | 16-SOIC - different |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Silicon Labs |
| Isolation Voltage | 3750 Vrms | 3750 Vrms | 3750 Vrms | 3750 Vrms | 2500 Vrms |
| Number of Channels | 7 | 7 | 7 | 7 | 4 |
| SPI Clock Rate (max) | 17 MHz | 17 MHz | 17 MHz | 2 Mbps (~1 MHz SPI) | 150 Mbps (not SPI-optimized) |
| Propagation Delay | 14 ns typical | 14 ns | 14 ns | 14 ns (high-speed channels) | 10-15 ns (not SPI-matched) |
| CMTI | 25 kV/µs | 25 kV/µs | 25 kV/µs | 25 kV/µs | 25 kV/µs typical |
| Supply Voltage Range | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 2.5 V to 5.5 V |
Key Differentiators
- SPI-optimized timing across 4 high-speed channels (vs ADUM3151ARSZ)
- Three forward auxiliary channels for handshake (vs ADUM3152ARSZ)
- Higher isolation voltage than common cross-brand alternatives (vs SI8622BB-B-IS)
Design Notes
Place 0.1 µF ceramic bypass capacitors on VDD1 (pin 1) and VDD2 (pin 19) within 2 mm of each supply pin. Use X7R dielectric (not Y5V) for stable capacitance across the -40 °C to +125 °C operating range. Add a 10 µF bulk capacitor on each supply rail near the IC to handle transient load steps during SPI burst transfers. Minimize the high-voltage-side ground loop area to preserve CMTI performance; the wide-body SSOP package provides 8 mm creepage but only if PCB cutouts under the package match the datasheet guidelines.
Route the SPI clock (pin 12/13) and MOSI/MISO (pins 14-17) traces as matched-length pairs (within 1 mm) to maintain propagation-delay matching that the ADUM3153ARSZ is designed for. Keep high-voltage-side traces away from low-voltage-side traces by at least 8 mm (or use a PCB slot) to preserve isolation barrier integrity. Avoid placing any copper (including ground planes) directly under the SSOP body except for the recommended thermal pad cutout pattern shown in the datasheet.
Do not connect the ADUM3153ARSZ supplies until both VDD1 and VDD2 are within regulation; partial-voltage power-up can cause permanent latch-up in the iCoupler transformer coils. Do not exceed 5.5 V on either supply - the absolute-maximum rating is 6.5 V but iCoupler reliability degrades above 5.5 V. Avoid driving the SPI clock above 17 MHz without re-evaluating propagation delay margins; use the ADUM3153 family only for SPI signals, not for general-purpose GPIO timing-critical paths.
Compliance Information
RoHS compliant per Analog Devices product page. 3750 Vrms isolation rating supports IEC 60730-1, IEC 61800-5-1, and IEC 60601-1 reinforced insulation when installed with proper PCB creepage.
