{"id":6425,"date":"2026-06-16T03:14:38","date_gmt":"2026-06-16T03:14:38","guid":{"rendered":"https:\/\/materialparts.com\/pc817c\/"},"modified":"2026-06-16T03:14:38","modified_gmt":"2026-06-16T03:14:38","slug":"pc817c","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/pc817c\/","title":{"rendered":"PC817C"},"content":{"rendered":"

Productos<\/h2>\n

The PC817C from Sharp (now Avago\/Broadcom) is a single-channel optocoupler consisting of an infrared LED optically coupled to a phototransistor in a 4-pin DIP package. The C suffix indicates a CTR range of 200-400%, providing high gain for signal isolation and SMPS feedback applications. It offers 5000Vrms isolation voltage.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Canales<\/td>\n1<\/td>\n<\/tr>\n
Tensi\u00f3n de aislamiento<\/td>\n5000Vrms (min)<\/td>\n<\/tr>\n
CTR (Current Transfer Ratio)<\/td>\n200-400% (C grade, at IF=5mA)<\/td>\n<\/tr>\n
LED Forward Voltage<\/td>\n1.2V (typ at IF=20mA)<\/td>\n<\/tr>\n
LED Forward Current<\/td>\n50mA (max)<\/td>\n<\/tr>\n
Collector-Emitter Voltage<\/td>\n80V (max)<\/td>\n<\/tr>\n
Collector Current<\/td>\n50mA (max)<\/td>\n<\/tr>\n
Bandwidth<\/td>\n-3dB at approx 80kHz<\/td>\n<\/tr>\n
Rise Time<\/td>\n4us (typ)<\/td>\n<\/tr>\n
Fall Time<\/td>\n3us (typ)<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-30C to +100C<\/td>\n<\/tr>\n
Paquete<\/td>\nDIP-4 (300mil)<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • 5000Vrms isolation voltage<\/li>\n
  • High CTR: 200-400% (C grade)<\/li>\n
  • 80V collector-emitter voltage<\/li>\n
  • 4-pin DIP through-hole package<\/li>\n
  • UL 1577 recognized<\/li>\n
  • Wide CTR grade selection (A\/B\/C\/D)<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • SMPS feedback loop<\/li>\n
    • Signal isolation<\/li>\n
    • Microcontroller I\/O isolation<\/li>\n
    • AC zero-cross detection<\/li>\n
    • Power supply supervision<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The PC817C from Sharp (now Avago\/Broadcom) is a single-channel optocoupler consisting of an infrared LED optically coupled to a phototransistor in a 4-pin DIP package. The C suffix indicates a CTR range of 200-400%, providing high gain for signal isolation and SMPS feedback applications. It offers 5000Vrms isolation voltage. Key Specifications Channels 1 […]<\/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":[30,13],"tags":[],"chip_brand":[250],"class_list":["post-6425","post","type-post","status-publish","format-standard","hentry","category-ac-dc-converters","category-integrated-circuits-ics","chip_brand-sharp"],"acf":{"brief_explanation":"1-ch optocoupler, CTR 200-400% (C grade), 5000Vrms, 80V Vceo, DIP-4","date_code":"","package_case":"DIP-4 (300mil, 7.62 x 5.08 x 4.00 mm)","in_stock":70000,"datasheet":"https:\/\/www.sharpsme.com\/download\/pc817-ds-e.pdf","price":"$0.10 @ 1ku","product_introduction":"The PC817C from Sharp is a single-channel optocoupler in a 4-pin DIP package providing 5000Vrms galvanic isolation. The C suffix grade offers a CTR (Current Transfer Ratio) of 200-400% at IF=5mA, providing high sensitivity for low-drive applications. The 80V collector-emitter voltage rating is higher than many competing optocouplers, giving more headroom for output circuit design. The PC817 is available in four CTR grades (A: 50-150%, B: 100-300%, C: 200-400%, D: 300-600%) allowing designers to optimize gain for specific applications. It is one of the most widely used optocouplers worldwide, particularly in SMPS feedback loops where its high CTR ensures reliable signal coupling even with low LED drive currents.","working_principle":"The PC817C works on the same optical coupling principle as other optocouplers. Forward current through the infrared LED (IF) generates photons that cross the dielectric isolation barrier and illuminate the base region of the output phototransistor. The absorbed photons create base-emitter photocurrent, which the transistor amplifies by its hFE to produce collector current (IC). The CTR of 200-400% means that IC is 2-4 times IF, providing signal gain. This high CTR is achieved by optimizing the phototransistor's hFE and the optical coupling efficiency. In SMPS feedback applications, the LED is typically driven by a TL431 shunt regulator through a current-setting resistor, and the phototransistor collector current controls the PWM controller's feedback pin to regulate the output voltage.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>
      1<\/td>Anode<\/td>Input<\/td>LED anode; connect through current-limiting resistor<\/td><\/tr>
      2<\/td>Cathode<\/td>Input<\/td>LED cathode; connects to drive circuit ground<\/td><\/tr>
      3<\/td>Emitter<\/td>Output<\/td>Phototransistor emitter; output ground<\/td><\/tr>
      4<\/td>Collector<\/td>Output<\/td>Phototransistor collector; pull up through resistor<\/td><\/tr><\/table>","application_scenarios":"
      • SMPS Feedback Isolation:<\/b> Provides isolated voltage feedback from secondary 5V\/12V output to primary PWM controller; TL431 drives LED, CTR of 200-400% ensures sufficient collector current to control feedback pin even at low IF<\/li>
      • AC Zero-Cross Detection:<\/b> LED driven through resistor from AC mains; phototransistor output pulses at zero-crossings for TRIAC phase control timing with 5000Vrms mains isolation<\/li>
      • Industrial Signal Isolation:<\/b> Isolates 4-20mA current loops and digital signals between PLCs and sensors with 5000Vrms preventing ground loops in noisy factory environments<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>CTR<\/th>VCEO<\/th>Key Difference<\/th><\/tr>
        TLP521-1<\/td>Toshiba<\/td>50-300%<\/td>55V<\/td>Lower CTR range, lower VCEO<\/td><\/tr>
        PC817A<\/td>Sharp<\/td>50-150%<\/td>80V<\/td>Lower CTR grade<\/td><\/tr>
        PC817B<\/td>Sharp<\/td>100-300%<\/td>80V<\/td>Medium CTR grade<\/td><\/tr>
        PC817D<\/td>Sharp<\/td>300-600%<\/td>80V<\/td>Higher CTR grade<\/td><\/tr>
        6N137<\/td>Vishay<\/td>Logic<\/td>7V<\/td>High-speed (10Mbps), logic output<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/6425","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=6425"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/6425\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=6425"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=6425"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=6425"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=6425"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}