ADUM1250ARZ - Hot Swappable Dual I2C Isolator | Analog Devices
MPN: ADUM1250ARZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.12 | $3.12 |
| 10 | $2.87 | $28.70 |
| 100 | $2.45 | $245.00 |
| 500 | $2.1 | $1,050.00 |
| 1,000 | $1.85 | $1,850.00 |
ADUM1250ARZ Overview
Digital isolators are components that transfer digital signals across an isolation barrier without a direct electrical connection, using capacitive, inductive, or optical coupling. They are essential in systems where safety, noise immunity, or ground potential differences require galvanic isolation. The ADUM1250ARZ uses Analog Devices' proprietary iCoupler chip-scale transformer technology, which offers advantages over traditional optocouplers, including higher data rates, lower power consumption, and better reliability.
Key features of the ADUM1250ARZ include nonlatching, bidirectional communication channels that are compatible with I2C interfaces, eliminating the need to split I2C signals into separate transmit and receive lines. It supports hot-swap capability, allowing insertion or removal of boards without powering down the system. The device also features open-drain outputs with 30mA current sink capability, ensuring compatibility with standard I2C bus specifications.
Technically, the ADUM1250ARZ provides two bidirectional channels, supporting a complete isolated I2C interface. It has a maximum data rate of 1Mbps, which is sufficient for standard and fast-mode I2C. The isolation barrier is rated at 2500Vrms, providing robust protection against voltage transients. The device operates over a temperature range of -40°C to +125°C, making it suitable for industrial environments.
Typical applications include isolated I2C buses in industrial automation, medical equipment, power management systems, and communication interfaces. The ADUM1250ARZ is also used in hot-swap applications where boards need to be replaced without interrupting system operation.
When designing with the ADUM1250ARZ, it is important to ensure proper decoupling of the power supply pins and to follow the recommended layout guidelines to maintain isolation performance. The device is RoHS compliant and available in tape and reel packaging.
Drop-in alternatives for ADUM1250ARZ — 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 ADUM1250ARZ (same form factor and footprint) — differing in Number of Channels, Package, Data Rate, Operating Temperature Range, Common-Mode Transient Immunity (CMTI).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADUM1251ARZ
✅ Drop-In✓ In Stock
$4.23 / Unit
View Datasheet →ISO1540DR
✅ Drop-In📋 Reference alternative (not in catalog)
ISO1541DR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADUM1281ARZ
✅ Drop-In📋 Reference alternative (not in catalog)
ADUM1250ARZ Specifications
| Isolation Voltage | 2500 Vrms |
| Number of Channels | 2 (bidirectional) |
| 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 |
| Hot-Swap Capable | Yes |
| I2C Compatibility | Side 2 I2C compliant, Side 1 I2C compatible |
ADUM1250ARZ Pin Configuration
| Pin 1 | VDD1 — Supply voltage side 1 |
| Pin 2 | GND1 — Ground side 1 |
| Pin 3 | SDA1 — Bidirectional data line side 1 |
| Pin 4 | SCL1 — Bidirectional clock line side 1 |
| Pin 5 | SCL2 — Bidirectional clock line side 2 |
| Pin 6 | SDA2 — Bidirectional data line side 2 |
| Pin 7 | GND2 — Ground side 2 |
| Pin 8 | VDD2 — Supply voltage side 2 |
Typical Applications
ADUM1250ARZ is suitable for 6 applications: Industrial Automation, Medical Equipment, Power Management, Communication Interfaces, Hot-Swap Systems, Sensor Networks.
Industrial Automation
The ADUM1250ARZ provides galvanic isolation for I2C buses in industrial control systems, protecting against ground loops and 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 downtime, enhancing maintainability.
Recommended
Medical Equipment
In medical devices, patient safety requires isolation between low-voltage control circuits and high-voltage sections. The ADUM1250ARZ's 2500Vrms isolation meets safety standards, while its 1Mbps data rate supports I2C sensors and monitors. The small SOIC package fits compact designs, and the wide temperature range ensures reliability in clinical environments.
Recommended
Power Management
The ADUM1250ARZ isolates I2C communication between power management controllers and monitoring circuits, preventing noise from switching regulators from corrupting data. Its 3.0V to 5.5V supply range matches common power rails, and the hot-swap feature allows safe board insertion in live systems. The device's low propagation delay ensures timely control signals.
Recommended
Communication Interfaces
The ADUM1250ARZ is used in isolated I2C interfaces for telecom and networking equipment, where ground potential differences can disrupt communication. Its bidirectional channels simplify design by eliminating the need for separate transmit/receive lines. The 1Mbps data rate supports fast-mode I2C, and the 25kV/µs CMTI ensures robust operation in high-EMI environments.
Recommended
Hot-Swap Systems
The ADUM1250ARZ is specifically designed for hot-swap applications, allowing boards to be inserted or removed without powering down the system. Its nonlatching, bidirectional channels prevent bus lockups during insertion. The device's open-drain outputs with 30mA sink capability ensure compatibility with standard I2C bus specifications, making it ideal for redundant systems.
Recommended
Sensor Networks
In distributed sensor networks, the ADUM1250ARZ isolates I2C buses connecting multiple sensors to a central controller, preventing ground loops and noise interference. Its 2500Vrms isolation protects sensitive sensors from voltage spikes. The wide operating temperature range and small package make it suitable for remote or embedded sensor nodes.
Recommended
Recommended Products Summary
Engineering reference data for ADUM1250ARZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADUM1251ARZ | ISO1540DR | ADUM1281ARZ |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Texas Instruments | Analog Devices |
| Isolation Voltage | 2500 Vrms | 2500 Vrms | 2500 Vrms | 2500 Vrms |
| Data Rate | 1 Mbps | 1 Mbps | 1 Mbps | 1 Mbps |
| Number of Channels | 2 (bidirectional) | 1 bidirectional + 1 unidirectional | 2 (bidirectional) | 2 (bidirectional) |
| CMTI | 25 kV/µs | 25 kV/µs | 25 kV/µs | 25 kV/µs |
| Supply Voltage Range | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V |
| Hot-Swap Capable | Yes | Yes | No | Yes |
Key Differentiators
- Hot-swap capability (vs ISO1540DR)
- Dual bidirectional channels (vs ADUM1251ARZ)
- iCoupler technology (vs ISO1540DR)
Design Notes
Ensure both VDD1 and VDD2 are properly decoupled with 0.1µF capacitors placed close to the pins. The supply voltage range is 3.0V to 5.5V, and both sides can operate at different voltages if needed. Use low-ESR ceramic capacitors for optimal performance.
Maintain proper creepage and clearance distances between the two isolated sides on the PCB to meet safety standards. The SOIC package provides 2500Vrms isolation, but the PCB layout must not compromise this. Keep the isolation barrier clear of copper traces.
Do not exceed the maximum data rate of 1Mbps. The device is designed for I2C communication, and exceeding this rate may cause data errors. Also, ensure that the I2C bus pull-up resistors are sized correctly for the capacitance on each side.
Compliance Information
RoHS compliant per distributor listings. Other compliance data not specified in provided sources.
