ADuM1252

RECOMMENDED FOR NEW DESIGNS

Ultra-Low Power, Bidirectional I²C Isolator with Extended V_DD, Idle-Bus Hot-Swap and Low V_OL

Data Sheet (Rev. 1) Product Selection Table

Part Models: 6
1ku List Price: Starting From $1.60

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Part Details

Low V_OL(MAX) for Greater I²C Device Compatibility
- Side 1: 0.69V
- Side 2: 0.4V
Ultra-Low Power Consumption for Longer Battery Life
- 142μA (typ) per Channel at 400kHz
Wide Independent V_DD1/V_DD2 Supply Range Supports More Logic Voltage Levels and Allows Level Shifting
- 1.71V to 5.5V for Both Sides
Enhanced Hot-Swappable Side 2 I/O
- Initial Side 2 Connection Occurs at Bus Idle or Stop States to Prevent Data Corruption
Bidirectional I²C Data Transfer up to 2MHz SCL
Bidirectional SCL for Advanced Bus Topologies
- Supports Clock Stretching and Multiple Controllers Across Isolation Barrier
Strong Current Sinking Enables Lower R_PULL-UP Values for Faster Bus Speeds
- Side 1: 5mA
- Side 2: 50mA

Robust Galvanic Isolation of Digital Signals
- Continuously Withstands (V_IOWM)
  - 8-MSOP: 300 V_RMS
  - 8-Narrow SOIC: 445 V_RMS
  - 8-Wide SOIC: 848 V_RMS
- Withstands ±10kV Surge per IEC 61000-4-5
- Creepage and Clearance
  - 8-MSOP: 3mm
  - 8-Narrow SOIC: 4mm
  - 8-Wide SOIC: 8mm
Safety and Regulatory Approvals (Pending)
- IEC60747-17 (Pending)
  - Reinforced V_IORM Narrow SOIC: 630V_PEAK
  - Reinforced V_IORM Wide SOIC: 1200V_PEAK
- UL 1577 (Pending)
  - 8-Narrow SOIC: 3000V_RMS for 1min
  - 8-Wide SOIC: 5000 V_RMS for 1min
- IEC/EN/CSA 62368-1 (Pending)
- IEC/EN/CSA 61010-1 (Pending
- CAN/CSA-C22.2 No. 14-18 (Pending)

Part Models: 6
1ku List Price: Starting From $1.60

Documentation

Data Sheet 1

ADuM1252: Ultra-Low Power, Bidirectional I²C Isolator with Extended V_DD, Idle-Bus Hot-Swap and Low V_OL DS (Rev.1) 11/03/2023

User Guide 2

ADuM1252SEVKIT: Evaluation Kit for ADuM1252, ADuM1253, ADuM1254, ADuM1255 (Rev.B) 02/09/2024

EVAL-LTC9105-AZ User Guide: LTC9105, MAX5974C, LT4321, and ADuM1252 IEEE 802.3bt Powered Device with I2C Telemetry (Rev.0) 03/03/2025

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
ADUM1252ASA+	S8MS+24A	Material Declaration Reliablity Data	Ultra Librarian SamacSys
ADUM1252ASA+T	S8MS+24A	Material Declaration Reliablity Data	Ultra Librarian SamacSys
ADUM1252AUA+	U8MS+5	Material Declaration Reliablity Data	Ultra Librarian SamacSys
ADUM1252AUA+T	U8MS+5	Material Declaration Reliablity Data	Ultra Librarian SamacSys
ADUM1252AWA+	8-SOIC_W-300_MIL	Material Declaration Reliablity Data	Ultra Librarian SamacSys
ADUM1252AWA+T	8-SOIC_W-300_MIL	Material Declaration Reliablity Data	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Hardware Ecosystem

Parts	Product Life Cycle	Description
Flyback, Forward, and Isolated Controller 2
LT8303	RECOMMENDED FOR NEW DESIGNS	100V_IN Micropower Isolated Flyback Converter with 150V/450mA Switch
LT3999	PRODUCTION	Low Noise, 1A, 1MHz Push-Pull DC/DC Driver with Duty Cycle Control
isoPower 2
ADuM5020	RECOMMENDED FOR NEW DESIGNS	Low Emission 500 mW Isolated DC-to-DC Converter
ADuM5028	RECOMMENDED FOR NEW DESIGNS	Low Emission Isolated DC to DC Converter

Transformer Drivers 1
MAX258	PRODUCTION	500mA Push-Pull Transformer Driver for Isolated Power Supplies

Tools & Simulations

IBIS Model 1

ADuM1252 IBIS Model

Evaluation Kits

Evaluates: ADuM1252, ADuM1253, ADuM1254, ADuM1255

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Features and Benefits

Data Transfer Rates from DC to 2MHz
Wide Voltage Supply Range from 1.71V to 5.5V
Convenient Four-Point I²C Bus Connection
Guaranteed up to 3.0kV_RMS Isolation for 60s
Support Onboard Supply-Current Measurement
40°C to +125°C Temperature Range
Proven PCB Layout
Fully Assembled and Tested

Product Details

The ADuM1252S evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the features of the ADuM1252, a 2-channel bidirectional reinforced digital isolator with ultra-low standby current in an 8-pin narrow SOIC surface-mount package. The ADuM1252S EV kit can be used to evaluate the functionality and electrical performance of the ADuM1252. The EV kit is powered by two independent power supplies.

The ADuM1252S EV kit can also be used to evaluate the ADuM1253, ADuM1254, or ADuM1255.

Resources

ADuM1252SEVKIT: Evaluation Kit for ADuM1252, ADuM1253, ADuM1254, ADuM1255 (Rev.B)
574.76 K

ADuM1252SEVKIT Design Files
2.77 M

EVAL-LTC9105-AZ: LTC9105, MAX5974C, LT4321, and ADuM1252 IEEE 802.3bt Powered Device with I2C Telemetry

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Features and Benefits

IEEE 802.3bt-compliant Class 6 PD
Port telemetry with an isolated I²C interface
5V/9.2A isolated synchronous forward converter

Product Details

The EVAL-LTC9105-AZ is an IEEE 802.3bt-compliant Type 3, Class 6 Power over Ethernet (PoE) powered device (PD) with port telemetry via I²C. The evaluation board features the LTC9105 PD interface controller, MAX5974C switching regulator controller, the LT4321 PoE ideal diode bridge controller, and the ADuM1252 I²C isolator.

The LTC9105 provides IEEE 802.3af-, IEEE 802.3at-, and IEEE 802.3bt-compliant interfacing with port voltage and current telemetry via I²C. It utilizes an external, low channel resistance, R_DS(ON) (34mΩ typical), N-channel, hot-swap metal-oxide semiconductor, field-effect transistor (MOSFET), and 50mΩ sense resistor. Automatic maintain power signature (MPS) keeps the port connected when the current drops to a low level.

The MAX5974C controls a DC/DC converter utilizing a highly efficient active-clamp forward converter topology with synchronous rectification and provides an isolated 5V/9.2A output. The LT4321 controls eight low R_DS(ON) (57mΩ typical), N-channel MOSFETs to further improve end-to-end power delivery efficiency and ease thermal design. The ADuM1252 isolates I²C data between the LTC9105 and a host controller on a nonisolated ground domain.

The EVAL-LTC9105-AZ is configured as a Class 6 PD and accepts up to 51W of delivered power from a power sourcing equipment (PSE) via its RJ45 connector (J1). The EVAL-LTC9105-AZ can be powered by a local 55V DC power supply using the auxiliary supply input terminals. With the DC590B I²C interface board connected to the EVAL-LTC9105-AZ, the EVAL-LTC9105-AZ graphical user interface (GUI) displays port telemetry and configuration options.