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Texas Instruments ISO643x/ISO643x-Q1 Digital Isolators

Texas Instruments ISO643x/ISO643x-Q1 Triple-Channel Digital Isolators are general-purpose digital isolators designed for applications requiring up to a 5000VRMS isolation rating per UL 1577. The devices are also certified by VDE, TUV, and CQC.

The ISO643x/ISO643x-Q1 devices provide high EMC performance while isolating CMOS or LVCMOS digital I/Os. ISO643x/ISO643x-Q1 uses SiO2 as the isolation barrier. Each isolation channel has an output buffer and logic input separated by the insulation barrier. The respective outputs can be set to high impedance using the enable pin provided with each device.

The Texas Instruments ISO6431/ISO6431-Q1 and ISO6431F/ISO6431F-Q1 devices have one reverse-direction channel. In the event of signal or input power loss, the default output is high for devices without the suffix F and low for devices with the suffix F. The ISO643x-Q1 devices are AEC-Q100 qualified for automotive applications.

Features

  • Functional safety-capable, with documentation available to aid in IEC 61508 system design
  • Up to 150Mbps data rate
  • Robust SiO2 isolation barrier
    • High lifetime at up to 1061VRMS and 1500VDC working voltage
    • Up to 5000VRMS isolation rating
    • Up to 10.4kV surge capability
    • Up to ±200kV/µs minimum CMTI
    • Wide temperature range of -40°C to +125°C ambient operating
  • 2.25V to 5.5V supply range 
  • Overvoltage-tolerant inputs
  • Default output high (ISO643x) and low (ISO643xF) options
  • 10ns (max.) at 5V, 12ns (max.) at 3.3V low propagation delay
  • Supports SPI up to 25MHz at 5V, 20.8MHz at 3.3V
  • 1.8ns (max.) at 5V, 2.2ns (max.) at 3.3V low pulse width distortion 
  • Robust electromagnetic compatibility (EMC)
    • System-level ESD, EFT, and surge immunity
    • Low emissions
  • Small footprint packages
    • Wide-SSOP (DFP-16) package
    • SSOP (DBQ-16) package
  • Safety-related certifications (planned)
    • DIN EN IEC 60747-17 (VDE 0884-17)
    • UL 1577 and CSA CAS Notice No. 5A
    • IEC 62368-1, IEC 61010-1, and GB 4943.1 certifications

Applications

  • Power supplies
  • Grid, electricity meter
  • Motor drives
  • Factory automation
  • Building automation
  • Lighting
  • Appliances

Datasheets

Simplified Schematic

Schematic - Texas Instruments ISO643x/ISO643x-Q1 Digital Isolators

Development Tool

Texas Instruments DIGI-ISO-EVM Digital Isolator Evaluation Module

For TI single-channel, dual-channel, triple-channel, quad-channel, or six-channel digital isolators.

Learn Moreabout Texas Instruments DIGI-ISO-EVM Digital Isolator Evaluation Module View Productsrelated to Texas Instruments DIGI-ISO-EVM Digital Isolator Evaluation Module
Published: 2026-09-03 | Updated: 2026-09-09