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ISO1540QDRQ1

TIISO1540QDRQ1

Texas Instruments
I2C Digital Isolator 2500Vrms 2 Channel 25kV/µs CMTI 8-SOIC (0.154", 3.90mm Width)
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Overview

The ISO1540QDRQ1 is a low-power, automotive-qualified bidirectional I2C isolator that provides 2500Vrms isolation. It supports data rates up to 1MHz and is designed to interface between low-voltage microcontrollers and I2C peripherals while preventing noise currents on a data bus from entering the local ground.

Why Choose This Part

This AEC-Q100 qualified device offers high transient immunity of 50kV/us typical and a wide operating temperature range of -40C to 125C. Its capacitive coupling technology ensures reliable operation with significantly lower power consumption compared to optocoupler-based solutions.

Applications

Electric Vehicle Battery Management Systems
Provides essential galvanic isolation between high-voltage battery cells and low-voltage monitoring circuits to protect personnel and control electronics.
Automotive Sensor Interfacing
Safely connects I2C-based sensors in harsh automotive environments where ground potential differences are common.
Industrial Control Systems
Facilitates isolated communication in industrial automation setups to prevent ground loops in noisy environments.

Key Specifications

Type I2C
Technology Capacitive Coupling
Channel Type Bidirectional
Mounting Type Surface Mount
Isolated Power No
Package / Case 8-SOIC (0.154", 3.90mm Width)
Voltage - Supply 3V ~ 5.5V
Number of Channels 2
Voltage - Isolation 2500Vrms
Operating Temperature -40degC ~ 125degC
Inputs - Side 1/Side 2 2/2
Supplier Device Package 8-SOIC
Pulse Width Distortion (Max) 80ns, 21ns
Common Mode Transient Immunity (Min) 25kV/us

Getting Started

Designers should place pull-up resistors on both sides of the isolator, as the open-drain outputs require them for proper I2C logic levels. For rapid prototyping, use the ISO1540EVM evaluation module to verify signal integrity and isolation performance before board layout.

ISO1540 Family

Part NumberDifferenceStock
ISO1540QDQ1 Q1 1,219
ISO1540DR DR 10,537

Also Consider

MAX14933 Maxim Integrated - Provides similar bidirectional I2C isolation but with a higher 2.75kVrms isolation rating.