ADUM1251 Hot Swappable Dual I2C Isolator

Isolated I2C, SMBus, or PMBus interfaces Multilevel I2C interfaces Power supplies Networking Power over Ethernet

The ADuM1250/ADuM1251 are hot swappable digital isolators with nonlatching, bidirectional communication channels compatible with I2C interfaces. This eliminates the need for splitting I2C signals into separate transmit and receive signals for use with standalone optocouplers.

The ADuM1250 provides two bidirectional channels, supporting a complete isolated I2C interface. The ADuM1251 provides one bidirectional channel and one unidirectional channel for those applications where a bidirectional clock is not required.

Both the ADuM1250 and ADuM1251 contain hot swap circuitry to prevent glitching data when an unpowered card is inserted onto an active bus.

These isolators are based on iCoupler® chip scale transformer technology from Analog Devices, Inc. iCoupler is a magnetic isolation technology with functional, performance, size, and power consumption advantages as compared to optocouplers. With the ADuM1250/ADuM1251, iCoupler channels can be integrated with semiconductor circuitry, which enables a complete isolated I2C interface to be implemented in a small form factor.

Applications

Features and Benefits
  • Automotive versions qualified per AEC-Q100
  • Bidirectional I2C communication
  • Open-drain interfaces
  • Suitable for hot swap applications
  • 30 mA current sink capability
  • 1000 kHz operation
  • High temperature operation: 125°C
  • Safety and regulatory approvals
    • UL recognition 2500 V rms for 1 minute per UL 1577
    • CSA Component Acceptance Notice 5A
    • VDE certificate of conformity DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 VIORM = 560 V peak
  • 3.0 V to 5.5 V supply/logic levels
  • 8-lead SOIC RoHS-compliant package
  • Safety & Regulatory Compliance
Interface & Isolation
Building Technology
  • White Goods and Vending
Automotive
  • Powertrain Body and Chassis
IBIS Models
Data Sheets
Documentnote
ADuM1250/ADuM1251: Hot Swappable, Dual I2C Isolators Data Sheet (Rev. H)PDF 301 kB
Application Notes
Documentnote
AN-0971: Recommendations for Control of Radiated Emissions with isoPower Devices (Rev. C)PDF 406 kB
AN-913: Isolating I2C Interfaces (Rev. 0)PDF 280 kB
AN-727: iCoupler® Isolation in RS-485 Applications (Rev. 0)PDF 282 kB
AN-740: iCoupler® Isolation in RS-232 Applications (Rev. 0)PDF 716 kB
AN-770: iCoupler® Isolation in CAN Bus Applications (Rev. 0)PDF 234 kB
AN-793: ESD/Latch-Up Considerations with iCoupler® Isolation Products (Rev. A)PDF 246 kB
AN-825: Power Supply Considerations in iCoupler® Isolation Products (Rev. 0)PDF 181 kB
Frequently Asked Questions
Documentnote
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
ADUM1251ARZ Production8 ld SOICOTH 98-40 to 105C2.482.2Y
ADUM1251ARZ-RL7 Production8 ld SOICREEL 1000-40 to 105C02.2Y
ADUM1251WARZ Production8 ld SOICOTH 98-40 to 125C2.832.51Y
ADUM1251WARZ-RL7 Production8 ld SOICREEL 1000-40 to 125C02.51Y
Reference Materials
ADuM1250/ADuM1251: Hot Swappable, Dual I2C Isolators Data Sheet (Rev. H) adum1250
ADuM1250/ADuM1251：热插拔双通道I2C隔离器 (Rev. G) adum1250
ADuM1251 IBIS Model (All Speed Grades) adum1251
AN-0971: isoPower器件的辐射控制建议 (Rev. C) adum1233
AN-0971: Recommendations for Control of Radiated Emissions with isoPower Devices (Rev. C) ad7400
AN-793: iCoupler®隔离产品的ESD/闩锁考虑因素 (Rev. A) adum1233
AN-770: CAN总线应用中的iCoupler®隔离 (Rev. 0) adum1233
AN-740: RS-232应用中的Coupler® 隔离 (Rev. 0) adum1233
AN-727: RS-485应用中的iCoupler®隔离 (Rev. 0) adum1233
AN-913: I²C 接口的隔离 (Rev. 0) adum1233
AN-913: Isolating I2C Interfaces (Rev. 0) ad7400
AN-727: iCoupler® Isolation in RS-485 Applications (Rev. 0) ad7400
AN-740: iCoupler® Isolation in RS-232 Applications (Rev. 0) ad7400
AN-770: iCoupler® Isolation in CAN Bus Applications (Rev. 0) ad7400
AN-793: ESD/Latch-Up Considerations with iCoupler® Isolation Products (Rev. A) ad7400
AN-825: iCoupler®隔离产品的电源考虑因素 (Rev. 0) adum1233
AN-825: Power Supply Considerations in iCoupler® Isolation Products (Rev. 0) ad7400
数字隔离器产品选型与资源指南 adum1233
Inside iCoupler® Technology:ADuM347x PWM Controller and Transformer Driver with ad7400
NAppkin Note: Lowering the Power of the ADuM524x ad7400
High Speed Digital Isolators Using Microscale On-Chip Transformers adum1233
微变压器为混合动力汽车提供信号与电源隔离 adum1233
iCoupler® Products with isoPower™ Technology: Signal and Power Transfer... adum1233
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