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ISO1640 ACTIVE Hot-swappable, robust-EMC bidirectional I2C isolator with bidirectional clock Pin-to-pin upgrade with hot-swap capability and improved EMC

Product details

Serial clock Bidirectional 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 Bidirectional 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 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) PDF | HTML 08 Apr 2019
Certificate CQC Certificate for ISO154xD, ISO742xD, ISO71xxDBQ 31 Aug 2022
Certificate UL Certificate of Compliance File E181974 Vol 4 Sec 3 08 Aug 2022
Certificate VDE Certificate for Basic Isolation for DIN EN IEC 60747-17 (Rev. T) 12 Jul 2022
User guide ISO154xEVM_UserGuide (Rev. A) PDF | HTML 28 Jun 2022
Application note How Do Isolated I2C Buffers with Hot-Swap Capability and IEC ESD Improve ... (Rev. A) PDF | HTML 03 Mar 2022
White paper Why are Digital Isolators Certified to Meet Electrical Equipment Standards? 16 Nov 2021
Certificate CSA Certification (Rev. Q) 14 Jun 2021
White paper Distance Through Insulation: How Digital Isolators Meet Certification Requiremen PDF | HTML 11 Jun 2021
Technical article Top 6 design questions about I2C isolators 13 Mar 2019
Analog Design Journal Designing an Isolated I2C Bus interface by using digital isolators (Rev. A) 13 Mar 2018

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

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Evaluation board

ISO154XEVM — ISO154xEVM Evaluation Module

The ISO154xEVM Evaluation Module has been designed to allow the user to evaluate the electrical parameter performance and features of TI's ISO154x family of 3kV I2C isolators which are based on TI's capacitive isolation technology. The ISO154xEVM Evaluation Module provides for the evaluation of:

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Daughter card

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Simulation model

ISO1540 IBIS Model

SLLM189.ZIP (31 KB) - IBIS Model
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Design guide: PDF
Schematic: PDF
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SOIC (D) 8 View options

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