Triple Channel, 2/1, 1Mbps, Digital Isolator

Triple Channel, 2/1, 1Mbps, Digital Isolator  - ISO7231A

Not Recommended for New Designs (NRND)

Replaced By ISO7231C– The device has the SAME FUNCTIONALITY and PINOUT as the compared device but is NOT an exact equivalent.
ISO7331C– The device has the SAME FUNCTIONALITY and PINOUT as the compared device but is NOT an exact equivalent.ISO7331C is a pin-to-pin upgrade from ISO7231A/C (2/1 config) with 20% higher isolation (3kVrms), lower power consumption and better immunity and robustness.

TI does not recommend using this part in a new design. This product continues to be in production to support existing customers.


See the Product Notification section. The ISO7230A and ISO7231A are triple-channel digital isolators each 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 on a data bus or other circuits from entering the local ground and interfering with or damaging sensitive circuitry.

The ISO7230 triple-channel device has all three channels in the same direction while the ISO7231 has two channels in one direction and one channel in opposition. These devices have an active-high output enable that when driven to a low level, places the output in a high-impedance state.

The ISO7230A and ISO7231A have TTL input thresholds and a noise-filter at the input that prevents transient pulses of up to 2ns in duration from being passed to the output of the device.

In each device a periodic update pulse is sent across the isolation 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. (Contact TI for a logic low failsafe option).

These devices require two supply voltages of 3.3V, 5V, or any combination. All inputs are 5V tolerant when supplied from a 3.3V supply and all outputs are 4mA CMOS. These devices are characterized for operation over the ambient temperature range of –40°C to 125°C.


  • 1Mbps Signaling Rate
    • Low Channel-to-Channel Output Skew; 2ns Maximum (5V-Operation)
    • Low Pulse-Width Distortion (PWD); 10ns Maximum (5V-Operation)
  • Typical 25-Year Life at Rated Working Voltage
  • 4000Vpeak Isolation, 560Vpeak VIORM
    • UL 1577, IEC 60747-5-2 (VDE 0884, Rev 2), IE 61010-1 and CSA Approved,
      IEC 60950-1
  • 4kV ESD Protection
  • Operate With 3.3V or 5V Supplies
  • High Electromagnetic Immunity (See Application note SLLA181)
  • –40°C to 125°C Operating Range
    • Industrial Fieldbus
    • Computer Peripheral Interface
    • Servo Control Interface
    • Data Acquisition

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