Product details

Integrated isolated power No Number of channels (#) 1 Forward/reverse channels 1 forward / 0 reverse Isolation rating (Vrms) 2500 Data rate (Max) (Mbps) 150 Rating HiRel Enhanced Product Surge voltage capability (Vpk) 4000 Current consumption per channel (DC) (Typ) (mA) 4.3 Operating temperature range (C) -55 to 125 Default output High Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 3 Propagation delay (Typ) (ns) 17
Integrated isolated power No Number of channels (#) 1 Forward/reverse channels 1 forward / 0 reverse Isolation rating (Vrms) 2500 Data rate (Max) (Mbps) 150 Rating HiRel Enhanced Product Surge voltage capability (Vpk) 4000 Current consumption per channel (DC) (Typ) (mA) 4.3 Operating temperature range (C) -55 to 125 Default output High Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 3 Propagation delay (Typ) (ns) 17
SOIC (D) 8 19 mm² 3.91 x 4.9
  • Controlled Baseline
    • One Assembly Site
    • One Test Site
    • One Fabrication Site
  • Extended Temperature Performance of –55°C to 125°C
  • Enhanced Diminishing Manufacturing Sources (DMS) Support
  • Enhanced Product-Change Notification
  • Qualification Pedigree(1)
  • 4000-V(peak) Isolation
    • UL 1577, IEC 60747-5-2 (VDE 0884, Rev. 2) IEC 61010-1
    • 50-kV/µs Transient Immunity Typical
  • Signaling Rate 0 Mbps to 150 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 Opto and Magnetic Isolators
  • APPLICATIONS
    • Industrial Fieldbus
      • Modbus
      • Profibus
      • DeviceNet Data Buses
      • Smart Distributed Systems (SDS)
    • Computer Peripheral Interface
    • Servo Control Interface
    • Data Acquisition

(1) Component qualification in accordance with JEDEC and industry standards to ensure reliable operation over an extended temperature range. This includes, but is not limited to, Highly Accelerated Stress Test (HAST) or biased 85/85, temperature cycle, autoclave or unbiased HAST, electromigration, bond intermetallic life, and mold compound life. Such qualification testing should not be viewed as justifying use of this component beyond specified performance and environmental limits.
(2) The signaling rate of a line is the number of voltage transitions that are made per second expressed in the units bps (bits per second).
SDS is a trademark of Honeywell.
DeviceNet is a trademark of Open Devicenet Vendors Association, Inc.

  • Controlled Baseline
    • One Assembly Site
    • One Test Site
    • One Fabrication Site
  • Extended Temperature Performance of –55°C to 125°C
  • Enhanced Diminishing Manufacturing Sources (DMS) Support
  • Enhanced Product-Change Notification
  • Qualification Pedigree(1)
  • 4000-V(peak) Isolation
    • UL 1577, IEC 60747-5-2 (VDE 0884, Rev. 2) IEC 61010-1
    • 50-kV/µs Transient Immunity Typical
  • Signaling Rate 0 Mbps to 150 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 Opto and Magnetic Isolators
  • APPLICATIONS
    • Industrial Fieldbus
      • Modbus
      • Profibus
      • DeviceNet Data Buses
      • Smart Distributed Systems (SDS)
    • Computer Peripheral Interface
    • Servo Control Interface
    • Data Acquisition

(1) Component qualification in accordance with JEDEC and industry standards to ensure reliable operation over an extended temperature range. This includes, but is not limited to, Highly Accelerated Stress Test (HAST) or biased 85/85, temperature cycle, autoclave or unbiased HAST, electromigration, bond intermetallic life, and mold compound life. Such qualification testing should not be viewed as justifying use of this component beyond specified performance and environmental limits.
(2) The signaling rate of a line is the number of voltage transitions that are made per second expressed in the units bps (bits per second).
SDS is a trademark of Honeywell.
DeviceNet is a trademark of Open Devicenet Vendors Association, Inc.

The ISO721, ISO721M, ISO722, and ISO722M are digital isolators 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, these devices prevent noise currents on a data bus or other circuits from entering the local ground, and interfering with or damaging sensitive circuitry.

A binary input signal is conditioned, translated to a balanced signal, then differentiated by the capacitive isolation barrier. 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 is sent across the barrier to ensure the proper dc level of the output. If this dc-refresh pulse is not received for more than 4 µs, the input is assumed to be unpowered or not being 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(2) from 0 Mbps (dc) to 100 Mbps for the ISO721/ISO722, and 0 Mbps to 150 Mbps with the ISO721M/ISO722M.

These devices require 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 ISO721 has TTL input thresholds 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 ISO721M has CMOS VCC/2 input thresholds, but do not have the noise filter and the additional propagation delay. These features of the ISO721M also provide for reduced jitter operation.

The ISO721M is characterized for operation over the ambient temperature range of –55°C to 125°C.

The ISO721, ISO721M, ISO722, and ISO722M are digital isolators 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, these devices prevent noise currents on a data bus or other circuits from entering the local ground, and interfering with or damaging sensitive circuitry.

A binary input signal is conditioned, translated to a balanced signal, then differentiated by the capacitive isolation barrier. 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 is sent across the barrier to ensure the proper dc level of the output. If this dc-refresh pulse is not received for more than 4 µs, the input is assumed to be unpowered or not being 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(2) from 0 Mbps (dc) to 100 Mbps for the ISO721/ISO722, and 0 Mbps to 150 Mbps with the ISO721M/ISO722M.

These devices require 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 ISO721 has TTL input thresholds 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 ISO721M has CMOS VCC/2 input thresholds, but do not have the noise filter and the additional propagation delay. These features of the ISO721M also provide for reduced jitter operation.

The ISO721M is characterized for operation over the ambient temperature range of –55°C to 125°C.

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Technical documentation

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Type Title Date
* Data sheet 3.3-V / 5-V High-Speed Digital Isolators datasheet 10 Jun 2008
* VID ISO721M-EP VID V6208627 21 Jun 2016
* Radiation & reliability report ISO721MMDREP Reliability Report 20 Jun 2016
White paper Why are Digital Isolators Certified to Meet Electrical Equipment Standards? 16 Nov 2021
Application note Digital Isolator Design Guide (Rev. D) 15 Nov 2021
White paper Distance Through Insulation: How Digital Isolators Meet Certification Requiremen 11 Jun 2021
EVM User's guide Universal Digital Isolator Evaluation Module 04 Mar 2021
White paper Improve Your System Performance by Replacing Optocouplers with Digital Isolators (Rev. A) 07 Dec 2020
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
Application note Considerations for Selecting Digital Isolators 24 Jul 2018

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Evaluation board

DIGI-ISO-EVM — Universal digital isolator evaluation module

DIGI-ISO-EVM is an evaluation module (EVM) used to evaluate any of the TI single-channel, dual-channel, triple-channel, quad-channel or six-channel digital isolator devices in five different packages - 8-pin narrow-body SOIC (D), 8-pin wide-body SOIC (DWV), 16-pin wide-body SOIC (DW), 16-pin ultra- (...)

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