ADUM3153BRSZ - 7Ch SPI Iso 3.75kV | Analog Devices
MPN: ADUM3153BRSZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.47 | $5.47 |
| 10 | $4.98 | $49.80 |
| 100 | $4.21 | $421.00 |
| 500 | $3.77 | $1,885.00 |
| 1,000 | $3.35 | $3,350.00 |
ADUM3153BRSZ Overview
A digital isolator is a component that transfers digital signals across an isolation barrier, protecting sensitive circuitry from high voltages, ground loops, and noise. In a typical system hierarchy, a digital isolator is part of the interface IC category, sitting between a controller and a peripheral or field-side device. The ADuM3153 uses Analog Devices iCoupler chip-scale transformer technology, which provides signal isolation with lower power and higher reliability than traditional optocouplers while enabling higher data rates.
Key features of the ADUM3153BRSZ include 7 isolated channels (4 SPI signals: CLK, MO/SI, MI/SO, SS, plus 3 auxiliary channels with 0 forward/3 reverse directionality), a 14ns propagation delay, and support for SPI clock rates up to 17MHz. The 34Mbps data rate and 25kV/us CMTI make the device robust in noisy industrial environments where high-voltage switching transients are common.
The ADuM315x family leverages iCoupler technology, which uses chip-scale micro-transformers rather than LEDs and photodiodes. This approach results in tighter propagation delay matching, higher data rates, and better reliability over temperature. The 20-SSOP package with 5.30mm width provides a compact footprint while allowing sufficient creepage and clearance for basic or reinforced isolation applications.
Typical applications include isolated SPI interfaces in motor drives, programmable logic controllers (PLCs), solar inverters, medical monitoring equipment, and isolated data acquisition systems. The 0/3 auxiliary channel directionality is especially useful when the isolated side must send multiple status, interrupt, or control signals back to the controller.
When designing with the ADUM3153BRSZ, pay careful attention to power supply bypassing on both sides of the isolation barrier, as well as PCB layout to maintain isolation spacing. Verify the auxiliary channel directionality matches your application, and consult the ADuM3151/ADuM3152/ADuM3153 datasheet for detailed pinout and recommended layout guidelines.
Drop-in alternatives for ADUM3153BRSZ — 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 ADUM3153BRSZ (same form factor and footprint) — differing in Package, Propagation Delay, Technology, Operating Temperature, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADUM3151BRSZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$7.8 / Unit
View Datasheet →ADUM3152BRSZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.81 / Unit
View Datasheet →ADUM3153ARSZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.05 / Unit
View Datasheet →ADUM3151ARSZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADUM3152ARSZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.8 / Unit
View Datasheet →ADUM3153BRSZ Specifications
| Type | SPI Digital Isolator |
| Number of Channels | 7 |
| Isolation Voltage | 3750 Vrms |
| Data Rate | 34 Mbps |
| CMTI (Common-Mode Transient Immunity) | 25 kV/µs |
| Propagation Delay | 14 ns |
| Maximum SPI Clock Rate | 17 MHz |
| Auxiliary Channel Directionality | 0 forward / 3 reverse |
| Technology | iCoupler chip-scale transformer |
| Package | 20-SSOP (0.209", 5.30 mm width) |
| Number of Pins | 20 |
| Mounting Type | Surface Mount |
| RoHS Status | unknown |
| Product Grade | B (3.75 kV) |
| Series | SPIsolator ADuM315x |
| Output Type | SPI bus isolation (CLK, MO/SI, MI/SO, SS) |
ADUM3153BRSZ 20-ssop (0.209", 5.30 mm width) Pin Configuration Guide
Pin configuration for ADUM3153BRSZ (20-ssop (0.209", 5.30 mm width) package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for ADUM3153BRSZ.
Refer to the datasheet for full pin configuration.
Typical Applications
ADUM3153BRSZ is suitable for 6 applications: Isolated SPI for Industrial Motor Drives, Isolated Sensor Interfaces for Factory Automation, Solar Inverter Communication, Medical Isolation, PLC / Programmable Logic Controllers, Isolated Data Acquisition for Test & Measurement.
Isolated SPI for Industrial Motor Drives
In motor drive systems, the ADUM3153BRSZ isolates the SPI link between the control MCU/DSP and isolated gate drivers, encoder interfaces, or power-stage monitoring ADCs. Its 3750Vrms isolation rating withstands inverter switching transients, while 25kV/us CMTI prevents data corruption during fast IGBT/SiC switching. The 34Mbps data rate supports high-speed parameter updates and real-time fault reporting. Reverse auxiliary channels carry status/interrupt signals from the isolated power stage back to the controller, simplifying closed-loop control and diagnostics in VFD and servo applications.
Recommended
Isolated Sensor Interfaces for Factory Automation
The ADUM3153BRSZ is used to isolate SPI-connected sensors such as temperature, pressure, and position transducers from the PLC backplane or fieldbus controller. The 7-channel architecture provides dedicated SPI isolation plus three reverse auxiliary channels, which are ideal for transmitting sensor status, alarm, or data-ready signals across the isolation barrier. The 14ns propagation delay ensures that real-time sensor data arrives promptly, while 3750Vrms isolation protects the controller from ground loops and industrial noise.
Recommended
Solar Inverter Communication
Solar inverters require robust isolation between the PV-side controller and the grid-side monitoring or communication subsystem. The ADUM3153BRSZ isolates the SPI bus used by power-line communication modems, metering ADCs, and battery-management monitors. Its 25kV/us CMTI ensures reliable operation in the presence of high dv/dt switching transients from the inverter power stage. The 3 reverse auxiliary channels can carry remote status and fault flags from the isolated side, making it easier to design comprehensive protection and monitoring functions.
Recommended
Medical Isolation
For medical patient monitoring and diagnostic equipment, the ADUM3153BRSZ provides reinforced 3750Vrms isolation between the patient-connected sensors and the processing unit. It isolates SPI-based AFE (analog front end) ADCs and digital temperature sensors, ensuring patient safety by preventing leakage currents. The high CMTI and low propagation delay preserve signal integrity even when the device is used near electrosurgical or defibrillation equipment. Its 20-SSOP package supports compact PCB designs needed for portable and wearable medical monitors.
Recommended
PLC / Programmable Logic Controllers
PLCs use ADUM3153BRSZ to isolate SPI communication between the main CPU and I/O expansion modules, analog input cards, or proprietary fieldbus controllers. The device supports high-speed SPI transactions needed for cyclic I/O updates, and its 3 reverse auxiliary channels carry module-ready or diagnostic interrupts back to the controller. The 3750Vrms isolation ensures safe communication in industrial environments where long cable runs can introduce ground potential differences and EMC noise.
Recommended
Isolated Data Acquisition for Test & Measurement
High-precision data acquisition systems often require isolated SPI buses to separate sensitive analog front ends from noisy digital processing sections. The ADUM3153BRSZ provides the isolation interface for ADCs, DACs, and digital sensors in instruments such as data loggers, spectrum analyzers, and automated test equipment. Its 14ns propagation delay ensures that sampling clocks and data lines remain tightly synchronized, while the 34Mbps data rate supports streaming high-resolution measurements. The 3 reverse auxiliary channels are useful for transferring trigger and error flags from the isolated measurement front end.
Recommended
Recommended Products Summary
Engineering reference data for ADUM3153BRSZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADUM3151BRSZ | ADUM3152BRSZ | ADUM3153ARSZ |
|---|---|---|---|---|
| Package | 20-SSOP (5.30mm) | 20-SSOP (5.30mm) | 20-SSOP (5.30mm) | 20-SSOP (5.30mm) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Channels | 7 | 7 | 7 | 7 |
| Data Rate (Mbps) | 34 | 34 | 34 | 34 |
| CMTI (kV/µs) | 25 | 25 | 25 | 25 |
| Propagation Delay (ns) | 14 | 14 | 14 | 14 |
| Aux Channel Direction (Forward/Reverse) | 0/3 | 3/0 | 2/2 | 0/3 |
Key Differentiators
- Provides 3 reverse-direction auxiliary channels (0/3) (vs ADUM3151BRSZ)
- B-grade 3750Vrms isolation rating (vs ADUM3153ARSZ)
- 0/3 auxiliary directionality maximizes reverse channel count (vs ADUM3152BRSZ)
Design Notes
Place 0.1µF bypass capacitors as close as possible to each VDD pin on both sides of the isolation barrier. Use a separate 1µF bulk capacitor on each supply rail. The iCoupler technology draws current only during output transitions, so adequate local decoupling is essential to maintain clean supply voltages and minimize radiated emissions. Refer to the ADuM315x datasheet's recommended decoupling layout.
Maintain proper creepage and clearance distances across the isolation barrier according to the required isolation rating (3750Vrms). Avoid routing copper traces underneath the device body that could bridge the isolation gap. A clean PCB cutout or slot under the isolator is often recommended for reinforced isolation. Keep digital noise sources away from the isolation barrier to preserve CMTI performance.
The 25kV/µs CMTI of ADUM3153BRSZ ensures that fast common-mode transients do not corrupt SPI data, but board-level EMI can still couple into high-impedance lines. Keep SPI traces short and matched, and use series termination resistors (typically 22-33Ω) near the driver outputs to reduce ringing. For noisy industrial environments, consider a solid ground plane on each side of the isolation gap to provide return paths for high-frequency currents.
Compliance Information
No compliance data was provided in the verified web data. Analog Devices typically offers RoHS-compliant parts, but this should be confirmed from the datasheet or manufacturer before finalizing BOM compliance.
