817B Optocoupler
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),...
SKU: sb33
Product details
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.
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