This website uses cookies. By using this site, you consent to the use of cookies. For more information, please take a look at our Privacy Policy.
  • ISO721QDRQ1

Request Information For ISO721QDRQ1

AvNet Arrow DigiKey Element14 RS Netwark Future Mouser Farnell TME tti verical
Looking for one or more parts? Have any date code or packaging restrictions? Please let the stocking distributors know here.

ISO721QDRQ1 Overview

The ISO72x-Q1 is a digital isolator with a logic input and output buffer separated by a silicon oxide (SiO2) insulation barrier. This barrier provides galvanic isolation of up to 4000 V. Used in conjunction with isolated power supplies, this device prevents noise currents on a data bus or other circuits from entering the local ground and interfering with or damaging sensitive circuitry.

The capacitive isolation barrier conditions, translates to a balanced signal, then differentiates a binary input signal. Across the isolation barrier, a differential comparator receives the logic-transition information, then sets or resets a flip-flop and the output circuit accordingly. A periodic update pulse sent across the barrier ensures the proper dc level of the output. On failure to receive this dc refresh pulse for more than 4 μs, the response of the device is as if the input is or not actively driven, and the failsafe circuit drives the output to a logic-high state.

The symmetry of the dielectric and capacitor within the integrated circuitry provides for close capacitive matching and allows fast transient voltage changes between the input and output grounds without corrupting the output. The small capacitance and resulting time constant provide for fast operation with signaling rates(1) from 0 Mbps (dc) to 100 Mbps.

The device requires two supply voltages of 3.3 V, 5 V, or any combination. All inputs are 5-V tolerant when supplied from a 3.3-V supply, and all outputs are 4-mA CMOS. The device has a TTL input threshold and a noise filter at the input that prevents transient pulses of up to 2 ns in duration from being passed to the output of the device.

The ISO722-Q1 device includes an active-low output enable that, when driven to a high logic level, places the output in a high-impedance state and turns off internal bias circuitry to conserve power.

The ISO72x-Q1 is characterized for operation over the ambient temperature range of –40°C to 125°C.



  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1:
      –40oC to 125oC Ambient Operating Temperature Range
    • Device HBM ESD Classification Level H2
    • Device CDM ESD Classification Level C5
  • 4000-V(peak) Isolation
    • UL 1577, IEC 60747-5-2 (VDE 0884, Rev 2), IEC 61010-1
    • 50-kV/s Transient Immunity (Typ)
  • Signaling Rate 0 Mbps to 100 Mbps
    • Low Propagation Delay
    • Low Pulse Skew
      (Pulse-Width Distortion)
  • Low-Power Sleep Mode
  • High Electromagnetic Immunity
  • Low Input Current Requirement
  • Failsafe Output
  • Drop-In Replacement for Most Optical and Magnetic Isolators

(1) The signaling rate of a line is the number of voltage transitions that occur per second, expressed in the units bps (bits per second).


Product Parameters

  • genericPartNumber


  • partDescription

    Automotive, single-channel, 100-Mbps digital isolator

  • statusDescription

    This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.

  • packageQtyCarrier

    2500|LARGE T&R

  • orderablePartNumber


  • statusDisplay


  • packageQuantity


  • packagePins

    SOIC (D)|8

Technical Documents

  • Considerations for Selecting Digital IsolatorsDetails>>

  • How to Replace Optocouplers with Digital Isolators in Standard Interface Circuit (Rev. A)Details>>

  • Digital Isolator Design Guide (Rev. F)Details>>

Other distributor's price

Distributor Part # Mfg. Description Price
digikey ISO721QDRQ1 Texas Instruments DGTL ISO 4000VPK 1CH 8SOIC


arrow ISO721QDRQ1 Texas Instruments Digital Isolator CMOS 1-CH 100Mbps Automotive 8-Pin SOIC T/R


mouser ISO721QDRQ1 Texas Instruments Digital Isolators Auto Cat Sgl 100Mbps Digital Isolator