ISO1540D

Overview

The ISO1540D is a low-power, bidirectional I2C isolator manufactured by Texas Instruments. It features two independent channels supporting bidirectional clock and data transmission at speeds up to 1 Mbps. The device provides 2.5-kVrms isolation voltage and operates within an extended temperature range of -40°C to 125°C. Packaged in an 8-pin SOIC format, it is designed for robust signal integrity in isolated communication interfaces.

Feature Summary

• Supports bidirectional I2C clock and data signals
• Provides 2.5-kVrms reinforced isolation barrier
• Operates with low power consumption suitable for battery applications

Applications

• Isolated I2C bus interfaces in industrial systems
• Bidirectional level shifting between isolated domains
• Protection of sensitive control circuits in noisy environments

Procurement Notes

Verify the specific suffix (e.g., DR vs D) as package variants exist. Confirm current manufacturing status since some listings indicate obsolescence. Ensure compatibility with system isolation requirements and check for recommended replacement parts if supply is limited.

Selection Notes

Select this component when bidirectional I2C isolation is required without external pull-up resistors on the isolation boundary. Consider the 8-pin SOIC package constraints and thermal performance. Validate that the 1 Mbps data rate meets application timing needs.

Part Context

Part of the ISO154x family of low-power bidirectional I2C isolators from Texas Instruments. Designed to replace traditional transformer or optocoupler solutions in space-constrained designs requiring reliable I2C communication across isolation barriers.

Replacement Considerations

ISO1540DR is listed as a manufacturer-recommended substitute. Verify package equivalence and electrical specifications before substitution.