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Details for Texas Instruments


Low-power bidirectional I2C isolator
Buy Directly from Texas Instruments (5351 in Stock)
$2.3600 per unit
Series Information for ISO1540QDRQ1 - Texas Instruments


  • feature
    3-V to 5.5-V Supply Range
  • feature
    AEC-Q100 Qualified With the Following Results: u2013 Device Temperature Grade 1: u201340u00b0C to +125u00b0C Ambient Operating Temperature u2013 Device HBM ESD Classification Level 3A u2013 Device CDM ESD Classification Level C6
  • feature
    Isolated Bidirectional, I2 C Compatible, Communication
  • feature
    Open-Drain Outputs With 3.5-mA Side 1 and 35- mA Side 2 Sink Current Capability
  • feature
    Qualified for Automotive Applications
  • feature
    Safety-Related Certifications:
  • feature
    Supports up to 1-MHz Operation
  • feature
    u00b150-kV/u00b5s Transient Immunity (Typical)


The ISO1540-Q1 and ISO1541-Q1 devices are lowpower, 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-Q1 and ISO1541-Q1 devices enable a complete isolated I2C interface to be implemented within a small form factor. The ISO1540-Q1 has two isolated bidirectional channels for clock and data lines while the ISO1541Q1 has a bidirectional data and a unidirectional clock channel. The ISO1541-Q1 is useful in applications that have a single master while the ISO1540-Q1 is suitable for multi-master applications. For applications where clock stretching by the slave is possible, the ISO1540-Q1 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 highlevel input voltage on side 1, thus preventing an internal logic latch that otherwise would occur with standard digital isolators.


No. of Channels:
2 Channel
Propagation Delay:
Supply Voltage Min:
Supply Voltage Max:
Interface Case Style:
No. of Pins:
Operating Temperature Min:
Operating Temperature Max:
Product Range:
Automotive Qualification Standard:
RoHS Phthalates Compliant:
MSL 2 - 1 year
No SVHC (27-Jun-2018)

Alternate Descriptions

Avnet America

Low-Power Bidirectional I2C Isolators

Avnet Europe

Low-Power Bidirectional I2C Isolators

Texas Instruments

Low-power bidirectional I2C isolator

Texas Instruments product