{"product_id":"817b-optocoupler","title":"817B Optocoupler","description":"\u003cp\u003eThis component is an \u003cb\u003e817B Optocoupler\u003c\/b\u003e (also known as an \u003cb\u003eOptoisolator\u003c\/b\u003e) in a 4-pin package (common equivalents include PC817B, EL817B, or LTV-817B).\u003c\/p\u003e\n\u003ch2\u003eMarking Breakdown\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003e817B:\u003c\/b\u003e Core part family (817 series) with a \u003cb\u003eRank B\u003c\/b\u003e Current Transfer Ratio (CTR), which typically ranges from \u003cb\u003e130% to 260%\u003c\/b\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eL2045:\u003c\/b\u003e Manufacturer batch \/ date code.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSmall Dimple\/Dot:\u003c\/b\u003e Indicates \u003cb\u003ePin 1\u003c\/b\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePinout Configuration\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eName\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003ePin 1\u003c\/b\u003e (Dot mark)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eAnode (+)\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eInput Infrared LED Positive terminal\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003ePin 2\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eCathode (-)\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eInput Infrared LED Negative terminal\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003ePin 3\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eEmitter\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eOutput Phototransistor Emitter\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003ePin 4\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eCollector\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eOutput Phototransistor Collector\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eFunction \u0026amp; Typical Applications\u003c\/h2\u003e\n\u003cp\u003eAn optocoupler transmits electrical signals using light rather than a direct wire, providing \u003cb\u003egalvanic isolation\u003c\/b\u003e between two parts of a circuit.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eHigh-Voltage Protection:\u003c\/b\u003e Protects sensitive microcontrollers (like Arduino, Raspberry Pi, or ESP32) from high voltages or voltage spikes on the load side.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003ePower Supplies:\u003c\/b\u003e Commonly used in the feedback loop of Switched-Mode Power Supplies (SMPS) to regulate voltage safely.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eNoise Reduction:\u003c\/b\u003e Eliminates ground loops and isolates electrical noise in industrial control systems and relay driver circuits.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"digilog.pk","offers":[{"title":"Default Title","offer_id":51670632202518,"sku":null,"price":0.0,"currency_code":"PKR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0744\/0764\/1366\/files\/817BOptocoupler_2.jpg?v=1786196133","url":"https:\/\/digilog.pk\/products\/817b-optocoupler","provider":"digilog.pk","version":"1.0","type":"link"}