Product details

Serial clock Unidirectional Number of channels (#) 2 Isolation rating (Vrms) 2500 Serial data Bidirectional Operating temperature range (C) -40 to 125 Data rate (Max) (Mbps) 1 Surge voltage rating (Vpk) 4000 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 3
Serial clock Unidirectional Number of channels (#) 2 Isolation rating (Vrms) 2500 Serial data Bidirectional Operating temperature range (C) -40 to 125 Data rate (Max) (Mbps) 1 Surge voltage rating (Vpk) 4000 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 3
SOIC (D) 8 19 mm² 4.9 x 3.9
  • Isolated bidirectional, I2C compatible, communication
  • Supports up to 1-MHz operation
  • 3-V to 5.5-V supply range
  • Open-drain outputs With 3.5-mA Side 1 and 35-mA Side 2 sink current capability
  • –40°C to +125°C operating temperature
  • ±50-kV/µs transient immunity (Typical)
  • HBM ESD protection of 4 kV on all pins;
    8 kV on bus pins
  • Safety-related certifications:
    • 4242-VPK isolation per DIN VDE V 0884-11:2017-01
    • 2500-VRMS isolation for 1 minute per UL 1577
    • CSA approval per IEC 60950-1 and IEC 62368-1 end equipment standards
    • CQC basic insulation per GB4943.1-2011
  • Isolated bidirectional, I2C compatible, communication
  • Supports up to 1-MHz operation
  • 3-V to 5.5-V supply range
  • Open-drain outputs With 3.5-mA Side 1 and 35-mA Side 2 sink current capability
  • –40°C to +125°C operating temperature
  • ±50-kV/µs transient immunity (Typical)
  • HBM ESD protection of 4 kV on all pins;
    8 kV on bus pins
  • Safety-related certifications:
    • 4242-VPK isolation per DIN VDE V 0884-11:2017-01
    • 2500-VRMS isolation for 1 minute per UL 1577
    • CSA approval per IEC 60950-1 and IEC 62368-1 end equipment standards
    • CQC basic insulation per GB4943.1-2011

The ISO1540 and ISO1541 devices are low-power, bidirectional isolators that are compatible with I2C interfaces. These devices have logic input and output buffers that are separated by Texas Instruments Capacitive Isolation technology using a silicon dioxide (SiO2) barrier. When used with isolated power supplies, these devices block high voltages, isolate grounds, and prevent noise currents from entering the local ground and interfering with or damaging sensitive circuitry.

This isolation technology provides for function, performance, size, and power consumption advantages when compared to optocouplers. The ISO1540 and ISO1541 devices enable a complete isolated I2C interface to be implemented within a small form factor.

The ISO1540 has two isolated bidirectional channels for clock and data lines while the ISO1541 has a bidirectional data and a unidirectional clock channel. The ISO1541 is useful in applications that have a single master while the ISO1540 is suitable for multi-master applications. For applications where clock stretching by the slave is possible, the ISO1540 device should be used.

Isolated bidirectional communication is accomplished within these devices by offsetting the low-level output voltage on side 1 to a value greater than the high-level input voltage on side 1, thus preventing an internal logic latch that otherwise would occur with standard digital isolators.

The ISO1540 and ISO1541 devices are low-power, bidirectional isolators that are compatible with I2C interfaces. These devices have logic input and output buffers that are separated by Texas Instruments Capacitive Isolation technology using a silicon dioxide (SiO2) barrier. When used with isolated power supplies, these devices block high voltages, isolate grounds, and prevent noise currents from entering the local ground and interfering with or damaging sensitive circuitry.

This isolation technology provides for function, performance, size, and power consumption advantages when compared to optocouplers. The ISO1540 and ISO1541 devices enable a complete isolated I2C interface to be implemented within a small form factor.

The ISO1540 has two isolated bidirectional channels for clock and data lines while the ISO1541 has a bidirectional data and a unidirectional clock channel. The ISO1541 is useful in applications that have a single master while the ISO1540 is suitable for multi-master applications. For applications where clock stretching by the slave is possible, the ISO1540 device should be used.

Isolated bidirectional communication is accomplished within these devices by offsetting the low-level output voltage on side 1 to a value greater than the high-level input voltage on side 1, thus preventing an internal logic latch that otherwise would occur with standard digital isolators.

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Technical documentation

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Type Title Date
* Data sheet ISO154x Low-Power Bidirectional I2C Isolators datasheet (Rev. E) 08 Apr 2019
White paper Why are Digital Isolators Certified to Meet Electrical Equipment Standards? 16 Nov 2021
Certificate CQC Certification (Rev. G) 19 Aug 2021
Certificate VDE Certificate for Basic Isolation for DIN VDE V 0884-11:2017-01 (Rev. S) 03 Aug 2021
Certificate CSA Certification (Rev. Q) 14 Jun 2021
White paper Distance Through Insulation: How Digital Isolators Meet Certification Requiremen 11 Jun 2021
Application note How Do Isolated I2C Buffers with Hot-Swap Capability and IEC ESD Improve ... 25 Mar 2021
Technical article How to stack battery monitors for high-cell-count industrial applications 11 Feb 2021
Certificate UL Certification (Rev. O) 03 Feb 2021
Technical article Top 6 design questions about I2C isolators 13 Mar 2019
Application note Simplify current and voltage monitoring with isolated SPI and I2C in your BMS 03 Jul 2018
Analog design journal Designing an Isolated I2C Bus interface by using digital isolators (Rev. A) 13 Mar 2018
User guide ISO154xEVM_UserGuide 11 May 2012

Design & development

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Simulation model

ISO1541 IBIS Model

SLLM190.ZIP (49 KB) - IBIS Model
Many TI reference designs include the ISO1541

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