ADUM3155BRSZ-RL7 - 7-Channel SPI Isolator 3750Vrms | Analog Devices
MPN: ADUM3155BRSZ-RL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.06 | $11.06 |
| 10 | $10.5 | $105.00 |
| 100 | $9.95 | $995.00 |
| 500 | $9.4 | $4,700.00 |
| 1,000 | $8.85 | $8,850.00 |
Drop-in alternatives for ADUM3155BRSZ-RL7 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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View Datasheet →ADUM3155BRSZ-RL7 Maximum Ratings & Electrical Characteristics
| Isolation Voltage | 3750 Vrms |
| Number of Channels | 7 |
| Data Rate | 34 Mbps |
| CMTI | 25 kV/µs |
| Propagation Delay | 14 ns |
| Supply Voltage (VDD1) | 4.5 V to 5.5 V |
| Supply Voltage (VDD2) | 4.5 V to 5.5 V |
| Operating Temperature | -40°C to +125°C |
| Package | 20-SSOP (0.209", 5.30mm Width) |
| Mounting Type | Surface Mount |
| Technology | iCoupler |
| SPI Clock Rate | 17 MHz |
| RoHS Status | Compliant |
| MSL Level | [DATA_NEEDED: MSL Level] |
| Qualification | Industrial |
ADUM3155BRSZ-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 | GND1 — Ground side 1 |
| Pin 8 | VDD1 — Supply voltage side 1 |
| Pin 9 | NC — No connect |
| Pin 10 | NC — No connect |
| Pin 11 | VDD2 — Supply voltage side 2 |
| Pin 12 | GND2 — Ground side 2 |
| Pin 13 | CLK2 — Isolated clock output |
| Pin 14 | MO/SI2 — Isolated data output |
| Pin 15 | MI/SO2 — Isolated data input |
| Pin 16 | SS2 — Isolated slave select |
| 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
ADUM3155BRSZ-RL7 is suitable for 6 applications: Industrial Automation, Motor Control, Data Acquisition Systems, Medical Equipment, Isolated Power Supplies, Communication Interfaces.
Industrial Automation
The ADUM3155BRSZ-RL7 provides isolated SPI communication in industrial automation systems, ensuring reliable data transfer between controllers and sensors in noisy environments. Its 3750 Vrms isolation and 25 kV/µs CMTI protect against ground loops and transient voltages, while the 34 Mbps data rate supports high-speed control loops. The device operates over -40°C to +125°C, making it suitable for harsh factory floors.
Recommended
Motor Control
In motor control applications, the ADUM3155BRSZ-RL7 isolates the SPI interface between the microcontroller and gate driver or encoder. The low 14 ns propagation delay ensures precise timing for PWM signals, while the high CMTI prevents false triggering from motor-induced transients. The 5 V operation simplifies power supply design, and the SSOP package fits compact drive modules.
Recommended
Data Acquisition Systems
The ADUM3155BRSZ-RL7 is used in data acquisition systems to isolate the ADC from the host controller, preventing ground noise from corrupting measurements. Its 34 Mbps data rate allows high-speed sampling, and the 3750 Vrms isolation protects sensitive analog circuits from high-voltage transients. The device supports SPI clock rates up to 17 MHz, ensuring compatibility with high-resolution ADCs.
Recommended
Medical Equipment
In medical equipment, the ADUM3155BRSZ-RL7 provides galvanic isolation for patient safety, isolating SPI interfaces in monitoring devices and diagnostic instruments. The 3750 Vrms isolation meets stringent safety standards, while the low propagation delay ensures real-time data transmission. The wide temperature range and high reliability make it suitable for critical medical applications.
Recommended
Isolated Power Supplies
The ADUM3155BRSZ-RL7 is used in isolated power supplies to communicate control signals across the isolation barrier. Its high CMTI ensures stable operation in the presence of switching noise, and the 34 Mbps data rate supports fast feedback loops. The device's low power consumption helps maintain efficiency in power supply designs.
Recommended
Communication Interfaces
The ADUM3155BRSZ-RL7 is employed in communication interfaces to isolate SPI buses between boards or systems, preventing ground loops and reducing noise. Its 3750 Vrms isolation and 25 kV/µs CMTI make it robust for industrial communication networks. The device supports high-speed data transfer, ensuring minimal latency in real-time systems.
Recommended
Recommended Products Summary
Engineering reference data for ADUM3155BRSZ-RL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADUM3151BRSZ-RL7 | ADUM3152BRSZ-RL7 | ADUM3153BRSZ-RL7 |
|---|---|---|---|---|
| Package | 20-SSOP | 20-SSOP | 20-SSOP | 20-SSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Isolation Voltage | 3750 Vrms | 3750 Vrms | 3750 Vrms | 3750 Vrms |
| Data Rate | 34 Mbps | 34 Mbps | 34 Mbps | 34 Mbps |
| CMTI | 25 kV/µs | 25 kV/µs | 25 kV/µs | 25 kV/µs |
| Propagation Delay | 14 ns | 14 ns | 14 ns | 14 ns |
| Supply Voltage | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V |
| Operating Temperature | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C |
Key Differentiators
- High data rate of 34 Mbps (vs ADUM3151BRSZ-RL7)
- Low propagation delay of 14 ns (vs ADUM3152BRSZ-RL7)
- High CMTI of 25 kV/µs (vs ADUM3153BRSZ-RL7)
Design Notes
Maintain proper isolation spacing on the PCB. The ADUM3155BRSZ-RL7 provides 3750 Vrms isolation, so the creepage and clearance distances between the two sides must meet safety standards. Use a slot or cutout under the device to increase the isolation distance if needed.
Keep the SPI signal traces short and balanced to minimize propagation delay and signal skew. The 14 ns propagation delay is low, but mismatched trace lengths can cause timing errors. Use ground planes on both sides of the isolation barrier to reduce noise coupling.
Decouple both VDD1 and VDD2 with 0.1 µF and 10 µF capacitors placed close to the pins. The device operates from 4.5V to 5.5V, and stable power is essential for reliable isolation. Avoid sharing the same power supply without proper filtering to prevent noise coupling across the barrier.
Compliance Information
RoHS compliant per distributor data. Other compliance information not specified in provided data.