Home ALL Products 817B Optocoupler
2ft Braid Solder Remover Wick 0.75M 2.0 mm Desoldering Copper Spool Wire Back to ALL Products MB102 Breadboard 830 Points Solderless Prototyping Breadboard High Quality

Sidebar
817B Optocoupler - a black, four-pin electronic component held on a finger, featuring the markings L2045, 817B, and Y on its top surface.
817B Optocoupler - a black, rectangular four-pin electronic component held between fingers, showing the text L2045, 817B, and Y printed on its surface.
817B Optocoupler - a black, four-pin electronic component held on a finger, featuring the markings L2045, 817B, and Y on its top surface.
817B Optocoupler - a black, rectangular four-pin electronic component held between fingers, showing the text L2045, 817B, and Y printed on its surface.

817B Optocoupler

Sale price Rs 35
SKU: sb33
Log in to use Wishlist
Add to Compare

Pickup available at Digilog Electronics

Usually ready in 2 hours

817B Optocoupler - a black, four-pin electronic component held on a finger, featuring the markings L2045, 817B, and Y on its top surface.

817B Optocoupler

  • Digilog Electronics

    Pickup available, usually ready in 2 hours

    🏢 Digilog Electronics 13th the RegalStreet,
    Back side of KFC, Near Abubakar Masjid Mall Road
    Lahore
    Pakistan

    +923124002221

    Check this on google map
817B Optocoupler - a black, four-pin electronic component held on a finger, featuring the markings L2045, 817B, and Y on its top surface.
817B Optocoupler
Sale priceRs 35

This component is an 817B Optocoupler (also known as an Optoisolator) in a 4-pin package (common equivalents include PC817B, EL817B, or LTV-817B).

Marking Breakdown

  • 817B: Core part family (817 series) with a Rank B Current Transfer Ratio (CTR), which typically ranges from 130% to 260%.

  • L2045: Manufacturer batch / date code.

  • Small Dimple/Dot: Indicates Pin 1.

Pinout Configuration

Pin Name Description
Pin 1 (Dot mark) Anode (+) Input Infrared LED Positive terminal
Pin 2 Cathode (-) Input Infrared LED Negative terminal
Pin 3 Emitter Output Phototransistor Emitter
Pin 4 Collector Output Phototransistor Collector

Function & Typical Applications

An optocoupler transmits electrical signals using light rather than a direct wire, providing galvanic isolation between two parts of a circuit.

  • High-Voltage Protection: Protects sensitive microcontrollers (like Arduino, Raspberry Pi, or ESP32) from high voltages or voltage spikes on the load side.

  • Power Supplies: Commonly used in the feedback loop of Switched-Mode Power Supplies (SMPS) to regulate voltage safely.

  • Noise Reduction: Eliminates ground loops and isolates electrical noise in industrial control systems and relay driver circuits.

You may also like