ADUM1251ARZ - I2C Digital Isolator 2500Vrms | Analog Devices
MPN: ADUM1251ARZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.61 | $6.61 |
| 10 | $5.95 | $59.50 |
| 100 | $5.29 | $529.00 |
| 500 | $4.76 | $2,380.00 |
| 1,000 | $4.23 | $4,230.00 |
Drop-in alternatives for ADUM1251ARZ — 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:
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)
SI8600AB-B-IS1
✅ Drop-In📋 Reference alternative (not in catalog)
ADUM1251ARZ Maximum Ratings & Electrical Characteristics
| Isolation Voltage | 2500 Vrms |
| Number of Channels | 2 |
| Data Rate | 1 Mbps |
| Common Mode Transient Immunity | 25 kV/µs |
| Propagation Delay | 162 ns |
| Supply Voltage Range | 3 V to 5.5 V |
| Package | 8-SOIC (0.154", 3.90mm Width) |
| Operating Temperature Range | -40°C to +125°C |
| Interface Type | I2C |
| Hot-Swap Capable | Yes |
| Bidirectional Channels | Yes |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Mounting Type | Surface Mount |
| Number of Pins | 8 |
ADUM1251ARZ 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 is suitable for 6 applications: Industrial Automation, Medical Equipment, Power Management, Automotive Electronics, IoT and Smart Home, Telecommunications.
Industrial Automation
The ADUM1251ARZ isolates I2C buses in industrial control systems, protecting sensitive logic from ground loops and high-voltage transients. Its 2500Vrms isolation and 25kV/µs CMTI ensure reliable communication in noisy factory environments. The hot-swap capability allows module replacement without system shutdown, improving uptime. With a 1Mbps data rate, it supports fast sensor and actuator communication, while the wide temperature range (-40°C to +125°C) suits harsh conditions.
Recommended
Medical Equipment
In medical devices, patient safety requires galvanic isolation between low-voltage control circuits and high-voltage sections. The ADUM1251ARZ provides 2500Vrms isolation, meeting safety standards. Its low propagation delay (162ns) ensures real-time data transfer for monitoring systems. The hot-swap feature is beneficial for field-serviceable equipment. The device's small 8-SOIC package fits compact designs, and its low power consumption extends battery life in portable monitors.
Recommended
Power Management
The ADUM1251ARZ isolates I2C communication between power management controllers and host processors, preventing noise from switching regulators from corrupting data. Its 25kV/µs CMTI ensures stable operation in high dV/dt environments. The device supports hot-swap, allowing power modules to be replaced without powering down the system. With a 3V to 5.5V supply range, it interfaces with various logic levels, and its 1Mbps data rate handles real-time monitoring of voltage and current.
Recommended
Automotive Electronics
In automotive systems, the ADUM1251ARZ isolates I2C buses in battery management, infotainment, and ADAS modules. Its wide temperature range (-40°C to +125°C) meets AEC-Q100 requirements. The 2500Vrms isolation protects against high-voltage transients from the vehicle's electrical system. The hot-swap feature is useful for battery pack replacement. The device's high CMTI (25kV/µs) ensures reliable communication in the presence of electromagnetic interference from motors and ignition systems.
Recommended
IoT and Smart Home
The ADUM1251ARZ isolates I2C sensors and actuators in smart home devices, protecting them from ground potential differences. Its low power consumption is ideal for battery-powered IoT nodes. The 1Mbps data rate supports fast sensor polling, while the small SOIC package fits compact designs. The hot-swap feature allows easy sensor replacement without system reset. With 2500Vrms isolation, it provides safety in devices connected to mains power.
Recommended
Telecommunications
In telecom equipment, the ADUM1251ARZ isolates I2C buses between line cards and control modules, preventing ground loops and noise. Its 2500Vrms isolation meets telecom safety standards. The high CMTI (25kV/µs) ensures reliable operation in environments with lightning surges and switching transients. The device's 1Mbps data rate supports configuration and monitoring of line cards. The hot-swap feature is critical for hot-swappable line cards in redundant systems.
Recommended
Recommended Products Summary
Engineering reference data for ADUM1251ARZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADUM1250ARZ | ADUM1251ARZ-RL7 | ADUM2251ARZ | ISO1541DR | ISO1540DR | SI8600AB-B-IS1 |
|---|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 16-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments | Silicon Labs |
| Isolation Voltage | 2500 Vrms | 2500 Vrms | 2500 Vrms | 5000 Vrms | 2500 Vrms | 2500 Vrms | 2500 Vrms |
| Data Rate | 1 Mbps | 1 Mbps | 1 Mbps | 1 Mbps | 1 Mbps | 1 Mbps | 1 Mbps |
| CMTI | 25 kV/µs | 25 kV/µs | 25 kV/µs | 25 kV/µs | 25 kV/µs | 25 kV/µs | 25 kV/µs |
| Propagation Delay | 162 ns | 162 ns | 162 ns | 162 ns | 150 ns | 150 ns | 150 ns |
| Supply Voltage Range | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V |
| Hot-Swap Capable | Yes | Yes | Yes | Yes | No | No | No |
Key Differentiators
- Hot-swap capability (vs ISO1541DR)
- Higher CMTI (vs SI8600AB-B-IS1)
- Same-brand drop-in alternatives (vs ADUM1250ARZ)
Design Notes
Place 0.1µF decoupling capacitors close to VDD1 and VDD2 pins to reduce noise and improve signal integrity. Use a ground plane under the device to minimize parasitic inductance. Keep the isolation barrier clear of copper traces to maintain isolation rating.
For high-speed I2C operation, keep the traces between the isolator and I2C devices as short as possible. Use pull-up resistors on both sides of the bus as per I2C specification. Refer to AN-1109 for evaluation board layout techniques to minimize emissions.
Ensure that the I2C bus capacitance does not exceed the maximum specified for the data rate. The hot-swap feature requires careful consideration of bus capacitance and pull-up resistor values to avoid glitches during insertion. Also, verify that Side 1 is only I2C-compatible, not fully I2C-compliant, so it may not work with all I2C devices.
Compliance Information
RoHS compliant per Analog Devices product page. Lead-free. AEC-Q100 not applicable for this non-automotive grade part.
