ADUM1251ARZ-RL7 - Hot-Swappable Dual I2C Isolator | Analog Devices
MPN: ADUM1251ARZ-RL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.61 | $6.61 |
| 10 | $6.1 | $61.00 |
| 100 | $5.2 | $520.00 |
| 500 | $4.5 | $2,250.00 |
| 1,000 | $3.9 | $3,900.00 |
Drop-in alternatives for ADUM1251ARZ-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:
ADUM1251ARZ
✅ Drop-In✓ In Stock
$4.23 / Unit
View Datasheet →ADUM1250ARZ
✅ Drop-In📋 Reference alternative (not in catalog)
ADUM1251ARZ-RL7
✅ Drop-In✓ In Stock
$3.9 / Unit
View Datasheet →ISO1541DR
✅ Drop-In📋 Reference alternative (not in catalog)
ISO1540DR
✅ Drop-In📋 Reference alternative (not in catalog)
ADUM1251ARZ-RL7 Maximum Ratings & Electrical Characteristics
| Isolation Voltage | 2500 Vrms |
| Number of Channels | 2 |
| Data Rate | 1 Mbps |
| Common-Mode Transient Immunity (CMTI) | 25 kV/µs |
| Supply Voltage Range | 3.0 V to 5.5 V |
| Current Sink Capability | 30 mA |
| Operating Temperature Range | -40°C to +125°C |
| Package Type | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Automotive Qualification | Qualified |
| Hot-Swap Support | Yes |
| Bidirectional Communication | Yes |
| Open-Drain Interface | Yes |
| Propagation Delay | [DATA_NEEDED: Propagation Delay] |
ADUM1251ARZ-RL7 Pin Configuration
| Pin 1 | VDD1 — Supply voltage, Side 1 |
| Pin 2 | GND1 — Ground, Side 1 |
| Pin 3 | SDA1 — I2C data, Side 1 |
| Pin 4 | SCL1 — I2C clock, Side 1 |
| Pin 5 | SCL2 — I2C clock, Side 2 |
| Pin 6 | SDA2 — I2C data, Side 2 |
| Pin 7 | GND2 — Ground, Side 2 |
| Pin 8 | VDD2 — Supply voltage, Side 2 |
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
ADUM1251ARZ-RL7 is suitable for 6 applications: Industrial Automation, Automotive Electronics, Medical Devices, Power Management Systems, Telecommunications, Test and Measurement.
Industrial Automation
The ADUM1251ARZ-RL7 provides galvanic isolation for I2C buses in industrial control systems, protecting microcontrollers from high-voltage transients and ground loops. Its 2500Vrms isolation and 25kV/µs CMTI ensure reliable communication in noisy factory environments. The hot-swap capability allows live insertion of modules without disrupting the bus, improving system uptime. With a 1Mbps data rate, it supports fast sensor and actuator communication, while the 30mA current sink capability drives multiple I2C devices.
Recommended
Automotive Electronics
The ADUM1251ARZ-RL7 is qualified for automotive applications, making it suitable for isolating I2C buses in vehicle systems such as battery management, infotainment, and ADAS. Its wide operating temperature range of -40°C to +125°C ensures reliable performance in harsh automotive environments. The 2500Vrms isolation protects sensitive electronics from high-voltage spikes, while the 1Mbps data rate supports real-time communication. The device's small 8-SOIC package saves board space in space-constrained automotive modules.
Recommended
Medical Devices
In medical equipment, the ADUM1251ARZ-RL7 provides the necessary galvanic isolation for patient safety, isolating I2C buses between control and monitoring circuits. Its 2500Vrms isolation meets stringent safety standards, while the low propagation delay ensures accurate data transfer. The device's hot-swap capability is beneficial for modular medical systems, allowing safe replacement of components without powering down. The 3.0V to 5.5V supply range accommodates various logic levels used in medical electronics.
Recommended
Power Management Systems
The ADUM1251ARZ-RL7 isolates I2C communication in power management systems, such as smart battery chargers and power supplies, preventing ground loops and noise interference. Its high CMTI of 25kV/µs ensures stable operation in the presence of switching transients. The device's 30mA current sink capability allows it to drive multiple I2C devices, while the hot-swap feature enables live replacement of power modules. The wide supply range supports both 3.3V and 5V control logic.
Recommended
Telecommunications
The ADUM1251ARZ-RL7 is used in telecommunications equipment to isolate I2C buses between line cards and control boards, protecting against voltage surges and ground potential differences. Its 2500Vrms isolation and 1Mbps data rate meet the requirements of high-speed communication systems. The device's small package and low power consumption make it ideal for dense telecom boards. The hot-swap capability allows maintenance without service interruption, enhancing network reliability.
Recommended
Test and Measurement
In test and measurement instruments, the ADUM1251ARZ-RL7 provides isolation for I2C buses, ensuring accurate data acquisition without interference from ground loops. Its high CMTI and low propagation delay preserve signal integrity in high-speed measurements. The device's wide operating temperature range and automotive qualification make it suitable for rugged test environments. The 8-SOIC package allows compact instrument designs, while the hot-swap feature facilitates easy calibration and maintenance.
Recommended
Recommended Products Summary
Engineering reference data for ADUM1251ARZ-RL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADUM1251ARZ | ADUM1250ARZ | ISO1541DR |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Isolation Voltage | 2500 Vrms | 2500 Vrms | 2500 Vrms | 2500 Vrms |
| Data Rate | 1 Mbps | 1 Mbps | 1 Mbps | 1 Mbps |
| CMTI | 25 kV/µs | 25 kV/µs | 25 kV/µs | 25 kV/µs |
| Supply Voltage | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V |
| Current Sink | 30 mA | 30 mA | 30 mA | 30 mA |
| Automotive Qualified | Yes | Yes | Yes | No |
Key Differentiators
- Hot-swap capability (vs ISO1541DR)
- Automotive qualification (vs ISO1541DR)
- Bidirectional channel configuration (vs ADUM1250ARZ)
Design Notes
Place 0.1µF decoupling capacitors close to VDD1 and VDD2 pins to ensure stable operation. Use a solid ground plane under the device to minimize noise. For high-speed operation, follow the layout guidelines in AN-1109 to reduce emissions.
Ensure that Side 1 is only connected to I2C-compatible devices, as Side 1 is I2C compatible but not fully compliant. Side 2 is fully I2C compliant. Verify logic levels of connected devices to avoid communication errors.
The ADUM1251ARZ-RL7 has low power dissipation, but in high-temperature environments, ensure adequate airflow or thermal relief. The operating temperature range is -40°C to +125°C, so verify that the junction temperature stays within limits.
Compliance Information
RoHS compliant per datasheet. Automotive qualified per datasheet.
