The ADUM1250ARZ-RL7 from Analog Devices is a hot-swappable dual bidirectional digital isolator designed for I²C interfaces. The ADuM1250 provides two non-latching bidirectional channels, allowing both SDA and SCL to cross the isolation barrier without splitting each I²C signal into separate transmit and receive paths.
The device uses Analog Devices iCoupler® chip-scale transformer isolation technology and is compatible with isolated I²C, SMBus, and PMBus interfaces.
Both isolation sides operate from 3.0V to 5.5V supplies, supporting common 3.3V and 5V logic systems and allowing different supply voltages on the two sides of the isolation barrier.
The ADuM1250 supports data rates of up to 1000kHz / 1MHz. Under the recommended operating conditions, ADI specifies a 40pF Side 1 capacitive load and up to 400pF on Side 2; bus capacitance and pull-up resistance must be considered carefully for high-speed operation.
Integrated hot-swap circuitry helps prevent bus glitches when an unpowered card is connected to an active bus. Both supplies also include undervoltage-lockout startup behavior to prevent the signal channels from inadvertently pulling the I²C bus low during power-up or power-down.
The isolation barrier is rated to 2500Vrms under UL 1577, while DIN EN IEC 60747-17 specifications include a 560Vpeak VIORM rating. Minimum external clearance and creepage distances are both 4.0mm.
Common-mode transient immunity is specified at 25kV/µs minimum and 35kV/µs typical. Side 2 provides up to 30mA current-sink capability under the specified conditions.
Typical supply current for the ADuM1250 is 2.8mA on Side 1 and 2.7mA on Side 2 at 5V, or approximately 1.9mA and 1.7mA respectively at 3.3V.
The exact ADUM1250ARZ-RL7 is an A-grade device rated from −40°C to +105°C and uses an 8-lead narrow-body SOIC package, R-8 option. The package body is approximately 4.80–5.00mm by 3.80–4.00mm with a 1.27mm lead pitch.
The Z suffix identifies the RoHS-compliant part, while the RL7 order code is supplied on a reel with 1,000 devices per reel.
Importantly, the exact ARZ version is not the automotive-qualified model. ADI explicitly identifies W-suffix devices as qualified for automotive applications, so automotive qualification should not be claimed for ADUM1250ARZ-RL7.
Analog Devices currently lists ADUM1250ARZ-RL7 as PRODUCTION.
Key Specifications
- Manufacturer: Analog Devices / ADI
- Manufacturer Part Number: ADUM1250ARZ-RL7
- Product Family: ADuM1250
- Device Type: Digital Isolator
- Interface: I²C / SMBus / PMBus
- Number of Channels: 2
- Channel Direction: Bidirectional
- SDA Isolation: Yes
- Bidirectional SCL Isolation: Yes
- Hot Swap Support: Yes
- Isolation Technology: iCoupler®
- Maximum Data Rate: 1MHz
- VDD1: 3.0V to 5.5V
- VDD2: 3.0V to 5.5V
- Side 1 Recommended Capacitive Load: 40pF
- Side 2 Recommended Capacitive Load: 400pF
- Side 2 Sink Capability: 30mA
- CMTI: 25kV/µs Minimum
- CMTI: 35kV/µs Typical
- UL 1577 Isolation Voltage: 2500Vrms
- VIORM: 560Vpeak
- VIOWM: 396Vrms / 560Vpeak DC
- VIOTM: 4000Vpeak
- Minimum Clearance: 4.0mm
- Minimum Creepage: 4.0mm
- Input-to-Output Capacitance: 1.0pF
- Isolation Resistance: >10¹²Ω at 25°C
- Typical IDD1 at 5V: 2.8mA
- Typical IDD2 at 5V: 2.7mA
- Typical IDD1 at 3.3V: 1.9mA
- Typical IDD2 at 3.3V: 1.7mA
- Input Capacitance: 4pF
- Grade: A Grade
- Operating Temperature: −40°C to +105°C
- Automotive Qualified: No, not this exact ARZ model
- Package: 8-Lead SOIC_N
- Package Option: R-8
- Pin Count: 8
- Body Length: 4.80–5.00mm
- Body Width: 3.80–4.00mm
- Lead Pitch: 1.27mm
- Mounting Type: Surface Mount
- RoHS: Compliant
- Packaging: Reel
- Reel Quantity: 1,000 pcs
- Product Status: PRODUCTION
Pin Functions
- Pin 1 — VDD1: Side 1 supply, 3.0V to 5.5V
- Pin 2 — SDA1: Bidirectional data I/O, Side 1
- Pin 3 — SCL1: Bidirectional clock I/O, Side 1
- Pin 4 — GND1: Ground reference for Side 1
- Pin 5 — GND2: Isolated ground reference for Side 2
- Pin 6 — SCL2: Bidirectional clock I/O, Side 2
- Pin 7 — SDA2: Bidirectional data I/O, Side 2
- Pin 8 — VDD2: Side 2 supply, 3.0V to 5.5V
Typical Applications
Suitable for isolated I²C, SMBus and PMBus interfaces, multilevel I²C systems, power supplies, industrial control, networking, Power over Ethernet systems, sensor isolation, and controller-to-peripheral digital isolation. For automotive applications, ADI’s W-qualified ADuM1250 versions should be selected.
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