ADUM3151BRSZ-RL7 - 7-Ch SPI Isolator 3.75kV | Analog Devices
MPN: ADUM3151BRSZ-RL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $10.48 | $10.48 |
| 10 | $9.85 | $98.50 |
| 100 | $8.92 | $892.00 |
| 500 | $8.1 | $4,050.00 |
| 1,000 | $7.45 | $7,450.00 |
Drop-in alternatives for ADUM3151BRSZ-RL7 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADUM3151BRSZ
✅ Drop-In✓ In Stock
$7.8 / Unit
View Datasheet →ADUM3150BRSZ-RL7
✅ Drop-In✓ In Stock
$5.9 / Unit
View Datasheet →ADUM3153BRSZ-RL7
✅ Drop-In✓ In Stock
$3.1 / Unit
View Datasheet →ADUM240E0BRIZ
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7741DW
✅ Drop-In📋 Reference alternative (not in catalog)
ADUM3151BRSZ-RL7 Maximum Ratings & Electrical Characteristics
| Technology | iCoupler (Magnetic Coupling) |
| Number of Channels | 7 |
| Inputs - Side 1/Side 2 | 5/2 |
| Isolation Voltage | 3750 Vrms |
| Data Rate | 34 Mbps |
| CMTI | 25 kV/µs |
| Propagation Delay | 14 ns |
| SPI Clock Rate | 17 MHz |
| Supply Voltage | 3.3V or 5V |
| Package | 20-SSOP (0.209", 5.30mm Width) |
| Operating Temperature | -40°C to +125°C |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (TR) |
| RoHS Status | Compliant |
| Isolated Power | No |
ADUM3151BRSZ-RL7 Pin Configuration
| Pin 1 | VDD1 — Supply voltage side 1 |
| Pin 2 | GND1 — Ground side 1 |
| Pin 3 | CLK — SPI clock input |
| Pin 4 | MO/SI — Master out/slave in |
| Pin 5 | MI/SO — Master in/slave out |
| Pin 6 | SS — Slave select |
| Pin 7 | AUX1 — Auxiliary channel 1 |
| Pin 8 | AUX2 — Auxiliary channel 2 |
| Pin 9 | AUX3 — Auxiliary channel 3 |
| Pin 10 | GND1 — Ground side 1 |
| Pin 11 | VDD2 — Supply voltage side 2 |
| Pin 12 | GND2 — Ground side 2 |
| Pin 13 | AUX4 — Auxiliary channel 4 |
| Pin 14 | AUX5 — Auxiliary channel 5 |
| Pin 15 | AUX6 — Auxiliary channel 6 |
| Pin 16 | AUX7 — Auxiliary channel 7 |
| Pin 17 | GND2 — Ground side 2 |
| Pin 18 | VDD2 — Supply voltage side 2 |
| Pin 19 | NC — No connect |
| Pin 20 | NC — No connect |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
ADUM3151BRSZ-RL7 is suitable for 6 applications: Isolated SPI Interface, Industrial Motor Control, Medical Equipment, Isolated Sensor Data Acquisition, Communication Systems, Test and Measurement.
Isolated SPI Interface
The ADUM3151BRSZ-RL7 is optimized for isolated SPI communication, providing 7 channels with low propagation delay (14 ns) and support for SPI clock rates up to 17 MHz. It ensures reliable data transfer across isolation barriers in systems like motor control and industrial automation, where ground loops and noise can corrupt signals. The high CMTI of 25 kV/µs prevents false triggering in noisy environments.
Recommended
Industrial Motor Control
In motor control systems, the ADUM3151BRSZ-RL7 isolates the microcontroller from high-voltage power stages. Its 3.75 kVrms isolation and 25 kV/µs CMTI ensure safe and reliable operation in harsh industrial environments. The low propagation delay maintains precise timing for PWM signals, while the 7-channel configuration supports multiple SPI signals and auxiliary functions.
Recommended
Medical Equipment
The ADUM3151BRSZ-RL7 provides galvanic isolation for patient-connected medical devices, ensuring safety and preventing leakage currents. Its 3.75 kVrms isolation meets stringent medical standards, while the high data rate supports fast SPI communication with sensors and ADCs. The compact SSOP package is ideal for space-constrained medical instruments.
Recommended
Isolated Sensor Data Acquisition
For isolated sensor interfaces, the ADUM3151BRSZ-RL7 transmits SPI data from sensors to a controller across an isolation barrier. Its low propagation delay and high CMTI ensure accurate and reliable data acquisition in noisy industrial settings. The 7 channels allow for multiple sensor signals and control lines, simplifying system design.
Recommended
Communication Systems
In communication systems, the ADUM3151BRSZ-RL7 isolates SPI interfaces between baseband processors and RF front-ends. Its high data rate (34 Mbps) and low propagation delay (14 ns) support high-speed control signaling, while the 3.75 kVrms isolation protects against ground potential differences. The device is suitable for both wired and wireless communication infrastructure.
Recommended
Test and Measurement
The ADUM3151BRSZ-RL7 is used in test and measurement equipment to isolate digital control signals from sensitive analog front-ends. Its high CMTI and low propagation delay ensure accurate timing and noise immunity, critical for precise measurements. The 7-channel configuration provides flexibility for various signal routing needs.
Recommended
Recommended Products Summary
Engineering reference data for ADUM3151BRSZ-RL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADUM3151BRSZ | ADUM3150BRSZ-RL7 | ADUM3153BRSZ-RL7 | ADUM240E0BRIZ | ISO7741DW |
|---|---|---|---|---|---|---|
| Package | 20-SSOP | 20-SSOP | 20-SSOP | 20-SSOP | 20-SSOP | 20-SSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Number of Channels | 7 | 7 | 7 | 7 | 4 | 4 |
| Isolation Voltage | 3750 Vrms | 3750 Vrms | 3750 Vrms | 3750 Vrms | 5000 Vrms | 5000 Vrms |
| Data Rate | 34 Mbps | 34 Mbps | 34 Mbps | 34 Mbps | 150 Mbps | 100 Mbps |
| CMTI | 25 kV/µs | 25 kV/µs | 25 kV/µs | 25 kV/µs | 100 kV/µs | 100 kV/µs |
| Propagation Delay | 14 ns | 14 ns | 14 ns | 14 ns | 13 ns | 10.7 ns |
| SPI Optimized | Yes | Yes | Yes | Yes | No | No |
Key Differentiators
- SPI-optimized with 7 channels (vs ADUM240E0BRIZ)
- High CMTI of 25 kV/µs (vs ISO7741DW)
- Low propagation delay of 14 ns (vs ADUM3150BRSZ-RL7)
Design Notes
Ensure proper creepage and clearance distances on the PCB for the isolation barrier. The ADUM3151BRSZ-RL7 provides 3.75 kVrms isolation, so maintain at least 8 mm creepage for reinforced insulation per IPC-2221. Place the device with a clear slot or gap under the isolation barrier to prevent surface leakage.
Decouple both supply pins (VDD1 and VDD2) with 0.1 µF ceramic capacitors placed as close as possible to the pins. Additionally, use a 10 µF bulk capacitor on each side if the supply is shared with other components. This minimizes noise and ensures stable operation at high data rates.
Keep the SPI signal traces short and matched in length to minimize skew. The ADUM3151BRSZ-RL7 has a propagation delay of 14 ns, so trace length differences can cause timing errors at high clock rates. Use ground planes on both sides of the isolation barrier to reduce EMI.
Compliance Information
RoHS compliance confirmed by distributor listings. Other compliance data not explicitly stated in the provided data.