Product details


Integrated isolated power No Number of channels (#) 2 Forward/reverse channels 1/1 Isolation rating (Vrms) 2500 Data rate (Max) (Mbps) 1 Rating Catalog Surge voltage capability (Vpk) 4000 Current consumption per channel (DC) (Typ) (mA) 1.5 Current consumption per channel (1 Mbps) (Typ) (mA) 1.5 Operating temperature range (C) -40 to 125 Default output High Supply voltage (Max) (V) 5 Supply voltage (Min) (V) 3.3 Propagation delay (Typ) (ns) 9 open-in-new Find other Digital isolators

Package | Pins | Size

SOIC (D) 8 19 mm² 4.9 x 3.9 open-in-new Find other Digital isolators


  • Highest Signaling Rate: 1 Mbps
  • Low Power Consumption, Typical ICC per Channel (3.3-V operation):
    • ISO7420: 1.1 mA, ISO7421: 1.5 mA
  • Low Propagation Delay – 9 ns Typical
  • Low Skew – 300 ps Typical
  • Wide TA Range: –40°C to 125°C (M-Grade)
  • 50-kV/μs Transient Immunity, Typical
  • Over 25-Year Isolation Integrity at Rated Voltage
  • Operates From 3.3-V and 5-V Supply and Logic Levels
  • 3.3-V and 5-V Level Translation
  • Narrow Body SOIC-8 Package
  • Safety and Regulatory Approvals:
    • 4242 VPK Isolation per DIN V VDE V 0884-10 and DIN EN 61010-1
    • 2500 VRMS Isolation for 1 minute per UL 1577
    • CSA Component Acceptance Notice 5A, IEC 60950-1 and IEC 61010-1 Standards
    • CQC Certification per GB4943.1-2011

All other trademarks are the property of their respective owners

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The ISO7420, ISO7420M and ISO7421 provide galvanic isolation up to 2500 VRMS for 1 minute per UL. These digital isolators have two isolated channels. Each isolation channel has a logic input and output buffer separated by a silicon dioxide (SiO2) insulation barrier. Used in conjunction with isolated power supplies, these devices prevent noise currents on a data bus or other circuit from entering the local ground and interfering with or damaging sensitive circuitry. The suffix M indicates wide temperature range (–40°C to 125°C).

These devices have TTL input thresholds and require two supply voltages, 3.3 or 5 V, or any combination. All inputs are 5-V tolerant when supplied from a 3.3-V supply.

Note: The ISO7420 and ISO7421 are specified for signaling rates up to 1 Mbps. Due to their fast response time, under most cases, these devices will also transmit data with much shorter pulse widths. Designers should add external filtering to remove spurious signals with input pulse duration <20 ns if desired.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 11
Type Title Date
* Datasheet ISO742x Low-Power Dual-Channel Digital Isolators datasheet (Rev. I) Jul. 16, 2015
Technical articles How to select the right digital isolator for your design Oct. 21, 2020
White paper Improve Your System Performance by Replacing Optocouplers with Digital Isolators Oct. 12, 2020
Technical articles Isolation 101: How to find the right isolation solution for your application Feb. 11, 2020
Technical articles Why signal isolation matters in 48-V HEV/EV systems Nov. 20, 2019
More literature CSA Certification (Rev. P) Nov. 19, 2019
More literature VDE certificate for basic isolation for DIN VDE V 0884-11:2017-01 (Rev. Q) Sep. 20, 2019
More literature CQC Certification (Rev. F) Sep. 13, 2019
More literature UL Certification (Rev. N) Jul. 30, 2019
Technical articles Staying on budget: How digital isolators are transforming field transmitters May 24, 2019
User guide Dual-Channel Digital Isolator EVM (Rev. D) Jul. 08, 2013

Design & development

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

Hardware development

ISO722X EVM Bench

This evaluation module (EVM) is used for testing the parametrics of the factory installed ISO7421 dual channel isolator. The EVM may be reconfigured by the user for use with any of the ISO7220X, ISO7221X or ISO742X dual channel isolators.

  • 1,5,25 and 150-Mbps Signaling Rate Options
  • -Low Channel-to-Channel Output Skew; 1 ns max

    -Low Pulse Width Distortion (PWD); 1 ns max

    -Low Jitter Content: 1 ns Typ at 150Mbps

  • Typical 25 Year life at Rated Voltage
  • 4000Vpeak Isolation, 560Vpeak Viorm
  • - UL 1577, IEC 60747-5-2 VDE 0884, Rev 2), IEC 61010-1 (...)

Design tools & simulation

SLOM200A.ZIP (28 KB) - IBIS Model

Reference designs

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document-generic Schematic
Multi-phase Energy Measurement with Isolated Shunt Sensors Reference Design
TIDA-00601 The TIDA-00601 design implements a Class 0.5% three-phase energy measurement system with isolated shunt sensors.  The isolation is achieved through the use of isolated delta-sigma modulators that have output circuitry capacitively isolated from input circuitry.  An energy measurement SoC (...)
document-generic Schematic
8 Channel, 2-A High-Side Driver Reference Design for Digital Output Modules
TIDA-01552 — This eight-channel, parallel, 2-A, high-side, digital output reference design for factory automation applications like PLCs shows the diagnostic features and the power density of new Texas Instruments high-side driver components (such as TPS27S100). Each output can individually measure the output (...)
document-generic Schematic
24V, 100W/30W Dual Sensorless Brushless DC Motor Drive Reference Design
TIDA-00447 TIDA-00447 is a 24V, dual Brushless DC (BLDC) motor drive reference design to be used in major home appliances to drive low voltage BLDC motors such as pumps and fans, e.g. for circulation pump and drain pump of dishwashers. The power stages of motor drive are designed for 100W and 30W of continuous (...)
document-generic Schematic
230V/250W, Hi-η Sensorless Brushless DC Motor Drive with 30% Reduced Bulk Capacitor Reference Design
TIDA-00472 The TIDA-00472 is a discrete IGBT-based three-phase inverter for driving brushless DC (BLDC) motors rated up to 250 W, for example, used in cooker hoods, using a sensor-less, trapezoidal control method. The design provides software implementation for DC bus voltage ripple compensation resulting in (...)
document-generic Schematic
16-Bit Analog Mixed Input and Output Module for Programmable Logic Controller (PLC) Reference Design
TIDA-00170 The TIDA-00170 is a reference design for industrial control Analog Mixed Input Output Modules. The design implements four channel analog input & two channel analog output. The analog input channels can measure all standard industrial voltages up to ±10V and current inputs up to 24mA. The (...)
document-generic Schematic
Low Side 0.5A 8ch Digital Output Module for PLC
TIDA-00236 Digital Output Modules are a standard component in a PLC/PAC or DCS to control actuators, motors and other resistive, capacitive or inductive loads. Customers will benefit from this integrated protected low side drivers and the low pin count control interface which saves pins and isolation channels (...)
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Isolated RS-232 to UART Converter Reference Design
TIDA-00163 This design implements an isolated data converter that utilizes residual power from the interface to power itself. This removes the requirement for expensive power transmission across the isolation boundary. By easily enabling the ubiquitous RS-232 connection on an electric meter, features like (...)
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