ADUM3151BRSZ - 7-Ch SPI Digital Isolator | Analog Devices
MPN: ADUM3151BRSZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.06 | $11.06 |
| 10 | $10.2 | $102.00 |
| 100 | $9.35 | $935.00 |
| 500 | $8.5 | $4,250.00 |
| 1,000 | $7.8 | $7,800.00 |
ADUM3151BRSZ Overview
A digital isolator is a component that provides electrical isolation between two circuits while allowing digital signals to pass across the isolation barrier. It is essential in applications where ground potential differences, noise, or safety requirements demand galvanic isolation. The ADUM3151BRSZ uses Analog Devices' iCoupler chip-scale transformer technology, which offers superior performance compared to optocouplers in terms of speed, power consumption, and reliability.
Key features include low propagation delay of 14 ns on the CLK, MO/SI, MI/SO, and SS channels, supporting SPI clock rates up to 17 MHz. The device also features a 7-channel configuration with three forward channels and four reverse channels, making it ideal for full-duplex SPI communication. The high CMTI of 25 kV/µs ensures reliable operation in noisy industrial environments.
The ADUM3151BRSZ is designed for isolated SPI interfaces in applications such as industrial automation, motor control, and data acquisition systems. Its low propagation delay and high data rate enable high-speed SPI communication across the isolation barrier without significant timing degradation. The device also includes an enable pin for power management and a thermal shutdown feature for protection.
When designing with the ADUM3151BRSZ, ensure proper PCB layout with adequate creepage and clearance distances for the isolation rating. The device requires a bypass capacitor on both supply pins to maintain signal integrity. The SSOP-20 package is suitable for space-constrained designs, and the device is RoHS compliant.
Drop-in alternatives for ADUM3151BRSZ — 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 ADUM3151BRSZ (same form factor and footprint) — differing in Package, Technology, Propagation Delay, RoHS Status, Supply Voltage.
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ADUM3152BRSZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.81 / Unit
View Datasheet →ADUM3153BRSZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.35 / Unit
View Datasheet →ADUM3151BRSZ Specifications
| Number of Channels | 7 |
| Isolation Voltage | 3750 Vrms |
| Data Rate | 34 Mbps |
| CMTI | 25 kV/µs |
| Propagation Delay | 14 ns |
| Supply Voltage | 3 V to 5.5 V |
| Package | 20-SSOP (0.209", 5.30mm Width) |
| Operating Temperature | -40°C to +125°C |
| Technology | iCoupler |
| SPI Clock Rate | 17 MHz |
| Forward Channels | 3 |
| Reverse Channels | 4 |
| RoHS | Compliant |
| Mounting Type | Surface Mount |
| Number of Pins | 20 |
ADUM3151BRSZ Pin Configuration
| Pin 1 | VDD1 — Supply voltage side 1 |
| Pin 2 | GND1 — Ground side 1 |
| Pin 3 | VOA — Output channel A |
| Pin 4 | VIA — Input channel A |
| Pin 5 | VOB — Output channel B |
| Pin 6 | VIB — Input channel B |
| Pin 7 | VOC — Output channel C |
| Pin 8 | VIC — Input channel C |
| Pin 9 | VOD — Output channel D |
| Pin 10 | VID — Input channel D |
| Pin 11 | GND2 — Ground side 2 |
| Pin 12 | VDD2 — Supply voltage side 2 |
| Pin 13 | VOE — Output channel E |
| Pin 14 | VIE — Input channel E |
| Pin 15 | VOF — Output channel F |
| Pin 16 | VIF — Input channel F |
| Pin 17 | VOG — Output channel G |
| Pin 18 | VIG — Input channel G |
| Pin 19 | EN — Enable pin |
| Pin 20 | NC — No connect |
Typical Applications
ADUM3151BRSZ is suitable for 6 applications: Industrial Automation, Motor Control, Data Acquisition Systems, Medical Equipment, Renewable Energy Systems, Automotive Electronics.
Industrial Automation
The ADUM3151BRSZ provides isolated SPI communication in industrial automation systems, such as PLCs and motor drives. Its 3750 Vrms isolation and 25 kV/µs CMTI ensure reliable data transfer in noisy environments. The low propagation delay of 14 ns supports high-speed SPI, enabling real-time control of sensors and actuators. The device's wide temperature range (-40°C to +125°C) makes it suitable for harsh industrial conditions.
Recommended
Motor Control
In motor control applications, the ADUM3151BRSZ isolates the microcontroller from the power stage, protecting low-voltage logic from high-voltage transients. The high CMTI of 25 kV/µs prevents false triggering during fast switching events. The device supports SPI communication for configuring motor drivers and reading encoder data. Its compact SSOP-20 package fits space-constrained designs, and the 3 V to 5.5 V supply range allows interfacing with various logic levels.
Recommended
Data Acquisition Systems
The ADUM3151BRSZ is used in data acquisition systems to isolate the ADC from the host controller, preventing ground loops and noise. Its 34 Mbps data rate allows high-speed transfer of sampled data. The 7-channel configuration provides dedicated lines for SPI signals, ensuring synchronized communication. The device's low propagation delay minimizes timing errors, which is critical for accurate data capture. It operates over a wide temperature range, making it suitable for remote sensing applications.
Recommended
Medical Equipment
The ADUM3151BRSZ provides galvanic isolation in medical devices, ensuring patient safety by isolating sensitive electronics from high-voltage sections. Its 3750 Vrms isolation rating meets safety standards for medical equipment. The low power consumption and high data rate make it suitable for portable monitoring devices. The device's small SSOP-20 package enables compact designs, and its wide temperature range ensures reliable operation in clinical environments.
Recommended
Renewable Energy Systems
In solar inverters and wind turbines, the ADUM3151BRSZ isolates control electronics from high-voltage power stages. Its high CMTI ensures reliable communication in the presence of fast switching transients. The device supports SPI for monitoring and controlling power converters. The wide operating temperature range and robust isolation make it ideal for outdoor installations. The 3 V to 5.5 V supply range allows integration with low-power microcontrollers.
Recommended
Automotive Electronics
The ADUM3151BRSZ is used in automotive systems for isolated SPI communication between ECUs and sensors. Its 3750 Vrms isolation protects low-voltage logic from high-voltage transients in hybrid and electric vehicles. The device's high data rate and low propagation delay enable real-time data exchange. It operates over a wide temperature range (-40°C to +125°C), suitable for under-hood applications. The compact SSOP-20 package fits space-constrained automotive PCBs.
Recommended
Recommended Products Summary
Engineering reference data for ADUM3151BRSZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADUM3151BRWZ | ADUM3152BRSZ | ADUM3153BRSZ | ISO7741DW | SI8642BB-B-IS1 |
|---|---|---|---|---|---|---|
| Package | 20-SSOP | 20-SOIC | 20-SSOP | 20-SSOP | 20-SOIC | 16-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Skyworks Solutions |
| Isolation Voltage | 3750 Vrms | 3750 Vrms | 3750 Vrms | 3750 Vrms | 5000 Vrms | 2500 Vrms |
| Data Rate | 34 Mbps | 34 Mbps | 34 Mbps | 34 Mbps | 100 Mbps | 150 Mbps |
| CMTI | 25 kV/µs | 25 kV/µs | 25 kV/µs | 25 kV/µs | 100 kV/µs | 35 kV/µs |
| Propagation Delay | 14 ns | 14 ns | 14 ns | 14 ns | 10 ns | 13 ns |
| Supply Voltage | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V | 2.25 V to 5.5 V | 2.5 V to 5.5 V |
| Channel Configuration | 3 forward, 4 reverse | 3 forward, 4 reverse | 4 forward, 3 reverse | 5 forward, 2 reverse | 4 forward, 3 reverse | 4 forward, 2 reverse |
Key Differentiators
- Optimized for SPI with 7 channels (vs ISO7741DW)
- High CMTI of 25 kV/µs (vs SI8642BB-B-IS1)
- Low propagation delay of 14 ns (vs ADUM3151BRWZ)
Design Notes
For the ADUM3151BRSZ, ensure proper PCB layout with adequate creepage and clearance distances for the 3750 Vrms isolation rating. Maintain at least 8 mm creepage between the two sides of the isolation barrier. Place bypass capacitors (0.1 µF) close to VDD1 and VDD2 pins to reduce noise. Use a solid ground plane under the device to minimize EMI.
The ADUM3151BRSZ requires a stable power supply on both sides of the isolation barrier. Use separate LDOs or isolated DC-DC converters to power VDD1 and VDD2. Ensure the supply voltage is within 3 V to 5.5 V. Decouple each supply pin with a 0.1 µF ceramic capacitor and a 10 µF bulk capacitor to handle transient currents.
Do not exceed the absolute maximum ratings, including the isolation voltage and supply voltage. Ensure the enable pin (EN) is properly driven to avoid unintended shutdown. When routing SPI signals, keep traces short and matched to minimize skew. Avoid routing high-speed signals near the isolation barrier to prevent coupling.
Compliance Information
RoHS compliant per distributor data. AEC-Q100 qualification not specified.