ISO7242A is not recommended for new designs.
This product continues to be in production to support existing customers. Please consider one of these alternatives:
Pin-for-pin with same functionality to the compared device.
ISO7742 ACTIVE Robust EMC, quad-channel, 2/2, reinforced digital isolator Pin-to-pin upgrade with higher isolation, stronger CMTI, wider supply range and better immunity and robustness

Product details

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  • 4000-Vpeak Isolation, 560-Vpeak VIORM
    • UL 1577 , IEC 60747-5-2 (VDE 0884, Rev 2),
      IEC 61010-1, IEC 60950-1 and CSA Approved
  • 4 kV ESD Protection
  • Operate With 3.3-V or 5-V Supplies
  • Typical 25-Year Life at Rated Working Voltage
    (See Application Note (SLLA197) and Figure 10)
  • High Electromagnetic Immunity
    (See Application Report (SLLA181))
  • –40°C to 125°C Operating Range
  • APPLICATIONS
    • Industrial Fieldbus
    • Computer Peripheral Interface
    • Servo Control Interface
    • Data Acquisition

  • 4000-Vpeak Isolation, 560-Vpeak VIORM
    • UL 1577 , IEC 60747-5-2 (VDE 0884, Rev 2),
      IEC 61010-1, IEC 60950-1 and CSA Approved
  • 4 kV ESD Protection
  • Operate With 3.3-V or 5-V Supplies
  • Typical 25-Year Life at Rated Working Voltage
    (See Application Note (SLLA197) and Figure 10)
  • High Electromagnetic Immunity
    (See Application Report (SLLA181))
  • –40°C to 125°C Operating Range
  • APPLICATIONS
    • Industrial Fieldbus
    • Computer Peripheral Interface
    • Servo Control Interface
    • Data Acquisition

See the Product Notification section. The ISO7240A, ISO7241A and ISO7242A are quad-channel digital isolators with multiple channel configurations and output enable functions. These devices have logic input and output buffers separated by TI’s silicon dioxide (SiO2) isolation barrier. Used in conjunction with isolated power supplies, these devices block high voltage, isolate grounds, and prevent noise currents from entering the local ground and interfering with or damaging sensitive circuitry.

The ISO7240A has all four channels in the same direction while the ISO7241A has three channels the same direction and one channel in opposition. The ISO7242A has two channels in each direction.

The devices have TTL input thresholds and a noise-filter at the input that prevents transient pulses from being passed to the output of the device.

A periodic update pulse is sent across the barrier to ensure the proper dc level of the output. If this dc-refresh pulse is not received, the input is assumed to be unpowered or not being actively driven, and the failsafe circuit drives the output to a logic high state. (See ISO7240CF (SLLS869) or contact TI for a logic low failsafe option).

These devices may be powered from either 3.3-V or 5-V supplies on either side in any 3.3-V / 3.3-V, 5-V / 5-V, 5-V / 3.3-V, or 3.3-V / 5-V combination. Note that the signal input pins are 5-V tolerant regardless of the voltage supply level being used.

These devices are characterized for operation over the ambient temperature range of –40°C to 125°C.

See the Product Notification section. The ISO7240A, ISO7241A and ISO7242A are quad-channel digital isolators with multiple channel configurations and output enable functions. These devices have logic input and output buffers separated by TI’s silicon dioxide (SiO2) isolation barrier. Used in conjunction with isolated power supplies, these devices block high voltage, isolate grounds, and prevent noise currents from entering the local ground and interfering with or damaging sensitive circuitry.

The ISO7240A has all four channels in the same direction while the ISO7241A has three channels the same direction and one channel in opposition. The ISO7242A has two channels in each direction.

The devices have TTL input thresholds and a noise-filter at the input that prevents transient pulses from being passed to the output of the device.

A periodic update pulse is sent across the barrier to ensure the proper dc level of the output. If this dc-refresh pulse is not received, the input is assumed to be unpowered or not being actively driven, and the failsafe circuit drives the output to a logic high state. (See ISO7240CF (SLLS869) or contact TI for a logic low failsafe option).

These devices may be powered from either 3.3-V or 5-V supplies on either side in any 3.3-V / 3.3-V, 5-V / 5-V, 5-V / 3.3-V, or 3.3-V / 5-V combination. Note that the signal input pins are 5-V tolerant regardless of the voltage supply level being used.

These devices are characterized for operation over the ambient temperature range of –40°C to 125°C.

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Technical documentation

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Type Title Date
* Data sheet 1-Mbps QUAD DIGITAL ISOLATORS datasheet (Rev. E) 27 Jan 2010
Certificate VDE Certificate for Basic Isolation for DIN VDE V 0884-11:2017-01 (Rev. S) 03 Aug 2021
Application note Digital Isolator Design Guide (Rev. C) 12 Jul 2021
Certificate CSA Certification (Rev. Q) 14 Jun 2021
Certificate UL Certification (Rev. O) 03 Feb 2021
Technical article How to select the right digital isolator for your design 21 Oct 2020
Technical article Why signal isolation matters in 48-V HEV/EV systems 20 Nov 2019
Technical article Staying on budget: How digital isolators are transforming field transmitters 24 May 2019
Technical article What are isolated digital inputs? 08 Mar 2019
User guide Triple- and Quad-Channel Digital Isolator EVM (Rev. A) 27 Sep 2011
Analog design journal 4Q 2010 Issue Analog Applications Journal 15 Nov 2010
Analog design journal Interfacing high-voltage applications to low-power controllers 15 Nov 2010

Design & development

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

Simulation model

ISO7242 IBIS Model (Rev. D)

SLLC347D.ZIP (13 KB) - IBIS Model
Reference designs

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