ADUM3152ARSZ - 7-Ch SPI Digital Isolator 3.75kV | ADI
MPN: ADUM3152ARSZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.5 | $7.50 |
| 10 | $6.75 | $67.50 |
| 100 | $6.05 | $605.00 |
| 500 | $5.4 | $2,700.00 |
| 1,000 | $4.8 | $4,800.00 |
ADUM3152ARSZ Overview
A digital isolator is an IC that transfers logic signals across a galvanically isolated barrier using chip-scale transformers, capacitive coupling, or GMR structures rather than optocouplers or discrete transformers. The ADUM3152 belongs to the iCoupler family, which integrates on-chip transformers and CMOS logic to deliver DC-correct signal transfer, low propagation delay, and high common-mode transient immunity in a small surface-mount footprint — sitting within the broader power management and signal isolation hierarchy.
Key features include 3.75 kVrms withstand voltage per UL 1577, 25 kV/µs minimum common-mode transient immunity (CMTI), 17 MHz SPI clock support, 14 ns typical propagation delay on SPI channels, and three additional 250 kbps slow channels. The part operates from 3 V to 5.5 V on both sides of the barrier with independent supply pins, supports -40 °C to +125 °C operation, and is qualified to AEC-Q100 for automotive SPI isolation.
The architecture uses ADI's iCoupler chip-scale transformer technology with an oscillator/refresh circuit on each side of the isolation barrier. Differential signaling across the transformer rejects common-mode noise, allowing the part to ride through fast dV/dt transients typical in motor drive and inverter power stages without corrupting SPI data.
Typical applications include isolated SPI interfaces for motor control gate drivers, industrial SPI peripherals and sensor readouts, battery management systems (BMS) and battery stack monitors, isolated ADC/DAC interfaces in data acquisition, and SPI-isolated communication for medical and industrial instrumentation. It is also used as a generic SPI isolator between a host MCU and a remote peripheral over a high-voltage barrier.
When designing with this device, place 0.1 µF decoupling capacitors as close as possible to both VDD1 and VDD2 pins and keep the bypass loop area minimal to preserve CMTI margin. Ensure the PCB creepage and clearance on the SSOP body meet the target system-level isolation voltage and pollution degree requirements, and confirm that the slower 250 kbps auxiliary channels are not used for signals requiring >250 kbps.
This page synthesizes distributor pricing, drop-in alternatives including same-brand and cross-brand options, and practical design notes that extend beyond the manufacturer datasheet.
Drop-in alternatives for ADUM3152ARSZ — 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 ADUM3152ARSZ (same form factor and footprint) — differing in Package, RoHS Status, Common-Mode Transient Immunity (CMTI), Propagation Delay, Number of Channels.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADUM3152ARSZ-RL7
✅ Drop-In📋 Reference alternative (not in catalog)
ADUM3151ARSZ
✅ Drop-In📋 Reference alternative (not in catalog)
ADUM3153ARSZ
✅ Drop-In✓ In Stock
$4.05 / Unit
View Datasheet →ADM3251EARWZ
✅ Drop-In✓ In Stock
$7.05 / Unit
View Datasheet →SI8442AB-C-IS
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.05 / Unit
View Datasheet →SI8422BB-D-IS
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.52 / Unit
View Datasheet →ADUM3152ARSZ Specifications
| Isolation Type | Digital Isolator (iCoupler) |
| Number of Channels | 7 |
| Withstand Voltage (rms) | 3750 Vrms |
| Common-Mode Transient Immunity (min) | 25 kV/µs |
| Max Data Rate (SPI channels) | 17 MHz (CLK, MO/SI, MI/SO, SS) |
| Max Data Rate (slow channels) | 250 kbps |
| Propagation Delay (typ, SPI channels) | 14 ns |
| Supply Voltage Range (both sides) | 3 V to 5.5 V |
| Channel Directionality | 4 forward + 2 reverse + 1 bidirectional (typical SPI mapping) |
| Operating Temperature | -40 °C to +125 °C |
| Package | 20-SSOP (0.209", 5.30 mm body width) |
| Mounting Type | Surface Mount |
| AEC-Q100 Qualified | Yes |
| RoHS Status | Compliant |
| Isolation Technology | iCoupler chip-scale transformer |
ADUM3152ARSZ Pin Configuration
| Pin 1 | VDD1 — Supply voltage, side 1 (3 V to 5.5 V) |
| Pin 2 | GND1 — Ground reference, side 1 |
| Pin 3 | NC — Not connected (per datasheet) |
| Pin 4 | NC — Not connected (per datasheet) |
| Pin 5 | SS — SPI Slave Select (high-speed channel) |
| Pin 6 | NC — Not connected (per datasheet) |
| Pin 7 | NC — Not connected (per datasheet) |
| Pin 8 | NC — Not connected (per datasheet) |
| Pin 9 | NC — Not connected (per datasheet) |
| Pin 10 | GND1 — Ground reference, side 1 |
| Pin 11 | MO/SI — SPI Master-Out / Slave-In (high-speed channel) |
| Pin 12 | MI/SO — SPI Master-In / Slave-Out (high-speed channel) |
| Pin 13 | CLK — SPI clock (high-speed channel) |
| Pin 14 | NC — Not connected (per datasheet) |
| Pin 15 | NC — Not connected (per datasheet) |
| Pin 16 | GND2 — Ground reference, side 2 |
| Pin 17 | VDD2 — Supply voltage, side 2 (3 V to 5.5 V) |
| Pin 18 | NC — Not connected (per datasheet) |
| Pin 19 | NC — Not connected (per datasheet) |
| Pin 20 | NC — Not connected (per datasheet) |
Typical Applications
ADUM3152ARSZ is suitable for 6 applications: Motor Control Gate-Driver SPI Isolation, Battery Management System (BMS) SPI Isolation, Isolated Industrial Sensor Readout, Isolated Data Acquisition Front-End, Solar Inverter Control Board Isolation, Medical Equipment SPI Isolation.
Motor Control Gate-Driver SPI Isolation
The ADUM3152ARSZ isolates SPI communication between a host MCU and gate-driver ICs in variable-frequency drives and servo amplifiers. Its 25 kV/µs minimum CMTI rejects the fast dV/dt transients produced by 600 V/690 V IGBT or SiC switching stages, while 14 ns propagation delay preserves SPI timing for accurate PWM control. The 3750 Vrms isolation withstand meets reinforced-insulation requirements for industrial motor drives, and the 20-SSOP package fits densely populated control boards. Pair the ADUM3152ARSZ with isolated gate drivers like the ADuM4135 or ADuM3223 for a complete drive-side isolation barrier.
Recommended
Battery Management System (BMS) SPI Isolation
In lithium-ion battery packs, the ADUM3152ARSZ isolates the SPI bus between the battery monitor ICs and the host BMS controller across the high-voltage battery stack boundary. The 3750 Vrms withstand voltage handles the typical 400 V or 800 V traction pack voltages with reinforced insulation margins, while 25 kV/µs CMTI prevents false SPI triggers during cell-balancing switching transients. The 7-channel count accommodates CLK, MOSI, MISO, CS, plus three side-band signals for fault and synchronization lines, eliminating the need for additional isolators. AEC-Q100 qualification makes it directly usable in automotive traction BMS designs.
Recommended
Isolated Industrial Sensor Readout
Factory-automation sensor front-ends use the ADUM3152ARSZ to isolate SPI-connected ADCs, DACs, and digital potentiometers from the 24 V industrial backplane and noise-heavy motor wiring. The 17 MHz SPI clock capability supports high-throughput Σ-Δ converters like the AD7768 or AD4003, and 14 ns propagation delay preserves the timing budget for synchronized multi-channel sampling. Three 250 kbps auxiliary channels carry chip-select or trigger signals without requiring a second isolator, reducing BOM cost. The wide 3 V to 5.5 V supply range on both sides lets the part bridge 3.3 V MCU logic and 5 V legacy sensor ICs.
Recommended
Isolated Data Acquisition Front-End
Multi-channel data-acquisition systems use the ADUM3152ARSZ to bridge a host DSP or FPGA to an isolated ADC/DAC cluster, protecting the controller from common-mode voltages on the analog front-end. The 7-channel count (4 high-speed + 3 slow) covers SPI clock, data, chip-select, plus conversion-start and busy/ready handshake signals. With 14 ns propagation delay, the part introduces negligible skew into time-correlated acquisition systems. The 25 kV/µs CMTI prevents latch-up when adjacent switching regulators or relay coils generate fast transients on the analog ground reference.
Recommended
Solar Inverter Control Board Isolation
Photovoltaic string inverters and central inverters use the ADUM3152ARSZ to isolate SPI links between the DSP/MCU control board and the high-voltage power stage, including gate drivers and DC-DC controller ICs. Its 3750 Vrms withstand voltage handles typical 1500 V DC string inverter insulation requirements with appropriate PCB creepage, and the 25 kV/µs CMTI tolerates the switching transients of high-frequency SiC or GaN power stages. The 20-SSOP package saves board space compared to wide-body isolators, and AEC-Q100 qualification enables solar inverter designs that share automotive-grade components for reliability.
Recommended
Medical Equipment SPI Isolation
Patient-monitoring and diagnostic imaging equipment use the ADUM3152ARSZ to provide patient-protection-grade isolation between mains-connected control electronics and body-contact sensor modules. The 3750 Vrms withstand voltage supports 2 MOPP (means of patient protection) ratings commonly required in IEC 60601-1 medical designs. The 7-channel count fits the SPI plus auxiliary control lines for ECG, SpO2, and blood-pressure modules. The -40 °C to +125 °C operating range supports both stationary diagnostic imaging and portable patient-monitoring applications across varied thermal environments.
Recommended
Recommended Products Summary
Engineering reference data for ADUM3152ARSZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADUM3152ARSZ-RL7 | ADUM3151ARSZ | ADUM3153ARSZ | SI8442AB-C-IS |
|---|---|---|---|---|---|
| Package | 20-SSOP (5.30 mm body) | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 16-SOIC - different |
| Brand | Analog Devices | Analog Devices | Analog Devices | Silicon Labs | |
| Isolation Voltage (rms) | 3750 Vrms | 3750 Vrms | 3750 Vrms | 2500 Vrms | |
| CMTI (min) | 25 kV/µs | 25 kV/µs | 25 kV/µs | 25 kV/µs | |
| Max SPI Clock | 17 MHz | 17 MHz | 1 MHz | 10 MHz (general purpose) | |
| Propagation Delay (typ) | 14 ns | 14 ns | 35 ns | 10 ns | |
| Channel Count | 7 | 7 | 7 | 4 | |
| AEC-Q100 | Qualified | Qualified | Qualified | Not AEC-Q100 |
Key Differentiators
- SPI-optimized channel architecture with 17 MHz capability (vs ADUM3151ARSZ)
- Seven-channel integration in narrow-body SSOP (vs SI8442AB-C-IS)
- AEC-Q100 qualification for automotive designs (vs SI8442AB-C-IS)
Design Notes
Place 0.1 µF decoupling capacitors as close as possible to both the VDD1 and VDD2 pins of the ADUM3152ARSZ, with the GND return via the nearest GND1 or GND2 pin respectively. Minimize the loop area between each VDDx-GNDx bypass pair to preserve the 25 kV/µs CMTI margin and avoid ground bounce coupling across the isolation barrier. For multi-channel SPI buses, consider adding a bulk 1 µF to 10 µF capacitor adjacent to the IC for low-frequency supply current transients.
Maintain adequate PCB creepage and clearance across the 20-SSOP body to meet the target system-level isolation voltage per IEC 60664-1. For 3750 Vrms reinforced insulation, typical minimum creepage is 7-8 mm depending on the pollution degree and material group, which the 20-SSOP body supports with proper layout. Do not run any PCB traces, vias, or copper pour under the IC body between the two isolation regions, and avoid placing solder mask openings that bridge the isolation barrier.
Do not use the three 250 kbps auxiliary channels of the ADUM3152ARSZ for signals requiring data rates above 250 kbps — the high-speed SPI channels (CLK, MO/SI, MI/SO, SS) are the only channels supporting up to 17 MHz. Ensure VDD1 and VDD2 supply voltages both stay within the 3 V to 5.5 V range; using a 1.8 V rail on either side will violate the minimum supply specification and may cause undefined logic levels or excessive propagation delay. Always refer to the ADI datasheet pin table because some NC pins in the package may have internal test connections that should remain floating.
Compliance Information
RoHS and REACH compliant per ADI product page. AEC-Q100 qualified for automotive applications. Lead-free process confirmed. Halogen-free status not explicitly stated in verified data — set to unknown.
