ADUM1251ARZ-RL7 - Hot-Swappable Dual I2C Isolator | Analog Devices
料号： ADUM1251ARZ-RL7 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 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 |
ADUM1251ARZ-RL7 概述
Digital isolators are components that transfer digital signals across an isolation barrier, typically using capacitive or magnetic coupling, to protect sensitive circuitry from high voltages, noise, and ground potential differences. They replace optocouplers in many applications due to their superior speed, reliability, and integration. The ADUM1251ARZ-RL7 belongs to the iCoupler family, which uses chip-scale transformer technology for isolation.
Key features include bidirectional I2C communication without the need for direction control, open-drain interfaces, 30mA current sink capability, and support for hot-swap applications. The device is qualified for automotive applications and operates over a temperature range of -40°C to +125°C. It is RoHS compliant and available in tape and reel packaging.
The ADUM1251ARZ-RL7 uses Analog Devices' iCoupler technology, which integrates micro-transformers and high-speed CMOS circuits to achieve reliable isolation. This architecture provides low propagation delay and high CMTI, ensuring robust performance in noisy industrial environments. The device also features non-latching, bidirectional channels, simplifying I2C bus isolation.
Typical applications include I2C bus isolation in industrial automation, power management systems, and automotive electronics. It is also used in medical devices and instrumentation where galvanic isolation is required for safety. The device's hot-swap capability allows insertion and removal of boards without disrupting the bus.
When designing with the ADUM1251ARZ-RL7, ensure proper decoupling with 0.1µF capacitors on both supply pins. The Side 1 interface is I2C compatible, while Side 2 is fully I2C compliant, so verify the logic levels of connected devices. For high-speed operation, follow the layout guidelines in AN-1109 to minimize emissions.
直接替换替代料： ADUM1251ARZ-RL7 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ADUM1251ARZ-RL7 （相同外形与封装尺寸） ——差异在于 Number of Channels, Supply Voltage Range, I2C Compatibility.
快速对比工具——选择替代料号进行并排对比：
ADUM1251ARZ
✅ 直接替换✓ 有现货
$4.23 / 个
查看数据手册 →ADUM1250ARZ
✅ 直接替换✓ 有现货
$1.85 / 个
查看数据手册 →ADUM1251ARZ-RL7
✅ 直接替换✓ 有现货
$3.9 / 个
查看数据手册 →ISO1541DR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ISO1540DR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ADUM1251ARZ-RL7 规格参数
| Isolation Voltage | 2500 Vrms |
| Number of Channels | 2 |
| 数据速率 | 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 |
| 工作温度范围 | -40°C to +125°C |
| Package Type | 8-SOIC (0.154", 3.90mm Width) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Automotive Qualification | Qualified |
| Hot-Swap Support | Yes |
| Bidirectional Communication | Yes |
| Open-Drain Interface | Yes |
ADUM1251ARZ-RL7 引脚配置
| 引脚 1 | VDD1 — Supply voltage, Side 1 |
| 引脚 2 | GND1 — Ground, Side 1 |
| 引脚 3 | SDA1 — I2C data, Side 1 |
| 引脚 4 | SCL1 — I2C clock, Side 1 |
| 引脚 5 | SCL2 — I2C clock, Side 2 |
| 引脚 6 | SDA2 — I2C data, Side 2 |
| 引脚 7 | GND2 — Ground, Side 2 |
| 引脚 8 | VDD2 — Supply voltage, Side 2 |
典型应用
ADUM1251ARZ-RL7 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： ADUM1251ARZ-RL7 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Hot-swap capability （对比 ISO1541DR)
- Automotive qualification （对比 ISO1541DR)
- Bidirectional channel configuration （对比 ADUM1250ARZ)
设计说明
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.
合规信息
RoHS compliant per datasheet. Automotive qualified per datasheet.
