ADUM1251ARZ - I2C Digital Isolator 2500Vrms | Analog Devices
料号： ADUM1251ARZ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 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 |
ADUM1251ARZ 概述
Digital isolators are components that provide galvanic isolation between two circuits while allowing digital signals to pass. They are essential in systems where ground potential differences or noise could disrupt communication, such as in industrial automation, medical equipment, and power management. The ADUM1251ARZ specifically supports I2C, a widely used two-wire bus, making it a key building block in mixed-voltage and isolated systems.
Key features include a common-mode transient immunity (CMTI) of 25kV/µs, ensuring reliable operation in noisy environments. The device supports hot-swap capability, allowing insertion or removal without powering down the bus. Its bidirectional channels are I2C-compatible on Side 2 and I2C-compatible on Side 1, with modified thresholds for compatibility. The propagation delay is 162ns, and the device is available in both tube and tape-and-reel packaging.
Technically, the ADUM1251ARZ uses Analog Devices' iCoupler technology, which employs chip-scale transformers instead of optocouplers, offering higher reliability and lower power consumption. The device is specified over the industrial temperature range of -40°C to +125°C, making it suitable for harsh environments. It is RoHS compliant and lead-free.
Typical applications include isolating I2C buses in industrial control systems, medical monitoring equipment, and power supply management. The device is also used in battery management systems and automotive electronics where isolation is required for safety and noise immunity.
When designing with the ADUM1251ARZ, ensure proper decoupling with 0.1µF capacitors on both supply pins and maintain adequate PCB layout to minimize parasitic capacitance. The hot-swap feature requires careful consideration of bus capacitance and pull-up resistor values to avoid glitches during insertion.
直接替换替代料： ADUM1251ARZ ——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 （相同外形与封装尺寸） ——差异在于 Number of Channels, Data Rate, Package, RoHS Status, Supply Voltage Range.
快速对比工具——选择替代料号进行并排对比：
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）
SI8600AB-B-IS1
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ADUM1251ARZ 规格参数
| Isolation Voltage | 2500 Vrms |
| Number of Channels | 2 |
| 数据速率 | 1 Mbps |
| Common Mode Transient Immunity | 25 kV/µs |
| Propagation Delay | 162 ns |
| Supply Voltage Range | 3 V to 5.5 V |
| 封装 | 8-SOIC (0.154", 3.90mm Width) |
| 工作温度范围 | -40°C to +125°C |
| 接口类型 | I2C |
| Hot-Swap Capable | Yes |
| Bidirectional Channels | Yes |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
| 安装类型 | Surface Mount |
| 引脚数 | 8 |
ADUM1251ARZ 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 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： ADUM1251ARZ ——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 | 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 |
关键差异点
- Hot-swap capability （对比 ISO1541DR)
- Higher CMTI （对比 SI8600AB-B-IS1)
- Same-brand drop-in alternatives （对比 ADUM1250ARZ)
设计说明
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.
合规信息
RoHS compliant per Analog Devices product page. Lead-free. AEC-Q100 not applicable for this non-automotive grade part.
