{"id":7929,"date":"2026-06-28T05:53:56","date_gmt":"2026-06-28T05:53:56","guid":{"rendered":"https:\/\/materialparts.com\/pc817c-3\/"},"modified":"2026-06-28T11:38:23","modified_gmt":"2026-06-28T11:38:23","slug":"pc817c-3","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/pc817c-3\/","title":{"rendered":"PC817C"},"content":{"rendered":"

Productos<\/h2>\n

The PC817C from Sharp (also produced by Everlight, Lite-on, and others) is a single-channel phototransistor optocoupler with 200-400% current transfer ratio, 5000Vrms isolation, and 80V collector-emitter voltage in a DIP-4 package.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Canales<\/td>\n1 (single)<\/td>\n<\/tr>\n
Output Type<\/td>\nPhototransistor<\/td>\n<\/tr>\n
CTR (Current Transfer Ratio)<\/td>\n200% to 400% @ IF=5mA, VCE=5V (C-grade)<\/td>\n<\/tr>\n
Tensi\u00f3n de aislamiento<\/td>\n5000Vrms (AC 1 minute)<\/td>\n<\/tr>\n
Tensi\u00f3n colector-emisor (VCEO)<\/td>\n35V min (80V typical from some mfrs)<\/td>\n<\/tr>\n
Forward Voltage (VF)<\/td>\n1.2V typical, 1.4V max @ IF=20mA<\/td>\n<\/tr>\n
Collector Dark Current (ICEO)<\/td>\n100nA max @ VCE=20V<\/td>\n<\/tr>\n
VCE(sat)<\/td>\n0.1V typical, 0.2V max @ IF=20mA, IC=1mA<\/td>\n<\/tr>\n
Forward Current (IF)<\/td>\n50mA max continuous<\/td>\n<\/tr>\n
Collector Current (IC)<\/td>\n50mA max<\/td>\n<\/tr>\n
Rise Time<\/td>\n4\u00b5s typical @ IC=2mA, RL=100\u03a9<\/td>\n<\/tr>\n
Fall Time<\/td>\n3\u00b5s typical @ IC=2mA, RL=100\u03a9<\/td>\n<\/tr>\n
Cut-off Frequency<\/td>\n80kHz typical (-3dB)<\/td>\n<\/tr>\n
Total Power Dissipation<\/td>\n200mW<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-30\u00b0C to +100\u00b0C<\/td>\n<\/tr>\n
Paquete<\/td>\nDIP-4 (6.4 x 4.58 x 3.5mm)<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • High CTR: 200-400% (C-grade) at 5mA<\/li>\n
  • 5000Vrms isolation voltage<\/li>\n
  • Compact DIP-4 package<\/li>\n
  • UL recognized (E465130)<\/li>\n
  • VDE approved (40039266)<\/li>\n
  • Low VCE(sat): 0.1V typical<\/li>\n
  • Multiple CTR grades available (A\/B\/C\/D)<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • SMPS feedback loop isolation<\/li>\n
    • Microcontroller I\/O isolation<\/li>\n
    • Signal isolation between logic domains<\/li>\n
    • AC mains zero-crossing detection<\/li>\n
    • Medical and industrial isolation<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The PC817C from Sharp (also produced by Everlight, Lite-on, and others) is a single-channel phototransistor optocoupler with 200-400% current transfer ratio, 5000Vrms isolation, and 80V collector-emitter voltage in a DIP-4 package. Key Specifications Channels 1 (single) Output Type Phototransistor CTR (Current Transfer Ratio) 200% to 400% @ IF=5mA, VCE=5V (C-grade) Isolation Voltage 5000Vrms […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,25],"tags":[],"chip_brand":[250],"class_list":["post-7929","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-microcontrollers-mcu","chip_brand-sharp"],"acf":{"brief_explanation":"1-ch optocoupler, phototransistor, CTR 200-400%, 5kVrms, DIP-4","date_code":"","package_case":"DIP-4 (6.4 x 4.58 x 3.5mm, 2.54mm pitch, through-hole)","in_stock":15000,"datasheet":"https:\/\/www.sharpsde.com\/fileadmin\/files\/Products\/Optoelectronics\/Isolation_Devices\/PC817XSeries.pdf","price":"$0.12 @ 1ku","product_introduction":"The PC817C from Sharp is a single-channel phototransistor optocoupler that provides galvanic isolation between input and output circuits using an infrared LED optically coupled to a phototransistor. The C-grade specifies a current transfer ratio (CTR) of 200% to 400% at IF=5mA, meaning the output phototransistor can sink up to 4\u00d7 the LED current\u2014a significant advantage over lower CTR grades when driving loads from small LED currents. The 5000Vrms isolation voltage provides robust safety isolation between high-voltage and low-voltage circuits, meeting IEC 60950 and medical equipment standards. The 80kHz cut-off frequency and 4\u00b5s\/3\u00b5s rise\/fall times make it suitable for low-frequency signal isolation but not for high-speed data communication. The PC817 is one of the most widely produced optocouplers, available from Sharp, Everlight, Lite-on, Cosmo, and many other manufacturers, ensuring multi-source availability. The C suffix denotes the CTR grade; A (50-160%), B (130-260%), and D (300-600%) grades are also available.","working_principle":"The PC817C consists of an infrared LED and an NPN phototransistor die, separated by a transparent insulating dielectric that provides 5000Vrms electrical isolation. When current flows through the LED (pins 1-2), it emits infrared light that passes through the dielectric and illuminates the base region of the phototransistor. The absorbed photons generate base current in the phototransistor, which is amplified by the transistor's current gain (hFE) to produce a much larger collector current. The ratio of collector current to LED current is the current transfer ratio (CTR). For the PC817C, CTR = 200-400% at IF=5mA, meaning IC = CTR \u00d7 IF = 200-400% \u00d7 5mA = 10-20mA. The phototransistor operates like a standard NPN transistor, but the base is optically driven rather than electrically connected. With no LED current, only a tiny dark current (100nA max) flows through the phototransistor. The VCE(sat) of 0.1V typical means the phototransistor can saturate like a normal transistor, pulling the collector very close to the emitter voltage when driven hard enough. The CTR degrades over time and with temperature: at 100\u00b0C, CTR may drop to 50% of its 25\u00b0C value, and after 50,000 hours of operation at IF=20mA, CTR may degrade by 30-50%. This aging must be factored into long-life designs such as SMPS feedback loops.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>Anode<\/td>Input<\/td>LED anode. Apply forward current (IF) through this pin to illuminate the internal infrared LED. Typical forward voltage VF = 1.2V at IF=20mA. Maximum continuous forward current is 60mA. Current-limiting resistor is required in series with the driving signal.<\/td><\/tr>\n
      2<\/td>Cathode<\/td>Input<\/td>LED cathode. Connect to ground (or low-side driver) to complete the LED circuit. Reverse voltage rating is 6V maximum. In typical applications, the cathode is driven by a microcontroller GPIO through a current-limiting resistor (220-1k\u03a9 for 5V systems).<\/td><\/tr>\n
      3<\/td>Emitter<\/td>Output<\/td>Phototransistor emitter. Connects to ground or the low side of the output circuit. Collector current flows into Pin 4 and out of Pin 3 when the LED is illuminated. The CTR (Current Transfer Ratio) for PC817C grade is 200-400% at IF=5mA, VCE=5V.<\/td><\/tr>\n
      4<\/td>Collector<\/td>Output<\/td>Phototransistor collector. Connects to the output pull-up resistor or load. Maximum collector-emitter voltage VCEO = 35V. Collector current is proportional to LED current multiplied by CTR. Dark current (LED off) is typically 50nA at VCE=20V.<\/td><\/tr>\n<\/table>\n

      PC817C pin assignment (DIP-4, top view, dot marks Pin 1): Pin 1 (top-left) = Anode, Pin 2 (top-right) = Cathode, Pin 3 (bottom-right) = Emitter, Pin 4 (bottom-left) = Collector. Pins 1-2 form the LED input side, Pins 3-4 form the phototransistor output side. The isolation barrier between sides provides 5000Vrms minimum insulation. CTR grade selection: A=80-160%, B=130-240%, C=200-400%, D=300-600%.<\/p>","application_scenarios":"

        \n
      • SMPS Feedback:<\/strong> LED driven by TL431 via optocoupler; collector connects to PWM controller FB pin; 200% CTR provides ample loop gain<\/li>\n
      • MCU I\/O Isolation:<\/strong> LED from MCU GPIO through 330\u03a9 resistor; collector pulled up to isolated 5V; emitter to isolated GND; signal crosses isolation barrier<\/li>\n
      • Zero-Crossing:<\/strong> LED driven from AC mains through 100k\u03a9 resistor and bridge rectifier; collector output pulses at 100\/120Hz for TRIAC triggering<\/li>\n
      • Relay Driver:<\/strong> LED from 3.3V MCU; collector drives relay coil through NPN transistor; 5kV isolation protects MCU from relay transients<\/li>\n
      • Solid-State Relay:<\/strong> PC817C drives TRIAC gate through buffer transistor; optically isolated AC switching<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Specs<\/th><\/tr>\n
        PC817A\/B<\/td>Sharp\/Various<\/td>Lower CTR grades (80-160%\/130-240%) for general-purpose signal isolation applications<\/td>DIP-4<\/td>50mA\/35V<\/td><\/tr>\n
        PC817D<\/td>Sharp\/Various<\/td>Higher CTR grade (300-600%) for low-drive-current applications like TRIAC triggering<\/td>DIP-4<\/td>50mA\/35V<\/td><\/tr>\n
        EL817C<\/td>Everlight<\/td>Direct pin-compatible equivalent with same CTR range and isolation voltage rating<\/td>DIP-4<\/td>50mA\/35V<\/td><\/tr>\n
        TLP2710<\/td>Toshiba<\/td>High-speed 5Mbps logic-output optocoupler with 5kV isolation for digital signal isolation<\/td>SO6L<\/td>5Mbps\/5kVrms<\/td><\/tr>\n
        VO618A-3X017T<\/td>Vishay<\/td>High-CTR 100-200% phototransistor optocoupler with 5.3kVrms isolation for safety isolation<\/td>SMD-4<\/td>50mA\/5.3kVrms<\/td><\/tr>\n<\/table>\n

        PC817C is a 4-pin phototransistor optocoupler with 200-400% CTR (C-grade) and 5kVrms isolation. It is the most widely used optocoupler for feedback loops in switching power supplies and TRIAC triggering. A\/B\/D grades offer different CTR ranges. EL817 is a direct replacement. For high-speed digital isolation, TLP2710 provides 5Mbps logic output. For safety-critical applications, VO618A offers 5.3kVrms with high CTR.<\/p>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/7929","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/comments?post=7929"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/7929\/revisions"}],"predecessor-version":[{"id":8234,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/7929\/revisions\/8234"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=7929"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=7929"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=7929"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=7929"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}