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[FAQ] What is a functional Isolator?

Aaditya V.
Genius 11635 points

What is a functional Isolator?

  • 0
    TI__Genius 11635 points

    Definition: Isolators with functional isolation protect and pass signals between two components that have a large ground potential difference.

    • Functional Isolators are great solutions for non-safety galvanic isolation required for seamless operation of the systems.

    Listed below are some differences between Functional, Basic, and Reinforced Isolation.

     

    Functional Isolation

    Basic Isolation

    Reinforced Isolation

    Definition

    Isolation required to support proper function of the equipment

    Isolation of hazardous-live-parts which provides basic protection

    Isolation of hazard-live parts which provides a degree of protection against electric shock equivalent to double insulation

    Typical application examples

    Infotainment, Power Delivery, Test and Measurement

    Traction Inverter

    EV Charging Station

    Creepage

    >2.2mm

    >4mm

    >8mm

    Example Devices

    ISO65xx

    ISO67xxB

    ISO77xxB

    ISO78xxB

    ISO67xx

    ISO77xx

    ISO78xx

    Packages

    REU

    D, DBQ, DW

    DW, DWV, DWW

     

    Shown below is the package comparison between functional, basic, and reinforced isolation. The image is to scale and is shown below:

    TI Functional isolators are available in REU package size and use less space on the PCB. The area of the REU package (6mm^2) is 80% less area than the D package (29.5mm^2). Since the REU package is a leadless package, less board space is used and can allow for more compact designs.