{"id":5612,"date":"2026-06-11T02:53:49","date_gmt":"2026-06-11T02:53:49","guid":{"rendered":"https:\/\/materialparts.com\/fod817d3sd\/"},"modified":"2026-06-12T09:12:01","modified_gmt":"2026-06-12T09:12:01","slug":"fod817d3sd","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/fod817d3sd\/","title":{"rendered":"FOD817D3SD"},"content":{"rendered":"

\u4ea7\u54c1\u6982\u89c8<\/h2>\n

The FOD817D3SD from onsemi is a phototransistor optocoupler with high CTR (300-600%) and 5000Vrms isolation in a DIP-4 SMD package for signal isolation in feedback loops.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n
\u5305\u88c5<\/td>\nDIP-4 SMD<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • See datasheet for complete specifications<\/li>\n
  • Industry-standard package<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Industrial control<\/li>\n
    • Consumer electronics<\/li>\n
    • Communication equipment<\/li>\n
    • Automotive electronics<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The FOD817D3SD from onsemi is a phototransistor optocoupler with high CTR (300-600%) and 5000Vrms isolation in a DIP-4 SMD package for signal isolation in feedback loops. Key Specifications Package DIP-4 SMD Features See datasheet for complete specifications Industry-standard package Applications Industrial control Consumer electronics Communication equipment Automotive electronics<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,20],"tags":[],"chip_brand":[144],"class_list":["post-5612","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-on"],"acf":{"brief_explanation":"Phototransistor optocoupler, CTR 300-600%, DIP-4 SMD","date_code":"","package_case":"DIP-4 SMD","in_stock":5814,"datasheet":"https:\/\/www.onsemi.com\/pub\/Collateral\/FOD817-D3.pdf","price":"$0.25 @ 1ku","product_introduction":"The FOD817D3SD from onsemi is a phototransistor optocoupler with high CTR (300-600%) and 5000Vrms isolation in a DIP-4 SMD package for signal isolation in feedback loops.","working_principle":"The FOD817D3SD is a phototransistor optocoupler from onsemi in DIP-4 SMD (gull-wing), providing galvanic isolation up to 5000Vrms. The device consists of an infrared LED optically coupled to an NPN phototransistor. When the LED is forward-biased, emitted photons are absorbed by the phototransistor base region, generating base current that turns on the collector-emitter conduction. The CTR (Current Transfer Ratio) is 300-600% (D3 rank), meaning the phototransistor can sink 3-6x the LED current. At IF=5mA, the phototransistor can sink 15-30mA, sufficient for driving logic gates, MOSFET gates (through a driver), or relay coils. The bandwidth is approximately 80kHz (limited by the phototransistor storage time), making it suitable for low-frequency signals and DC isolation. The saturation voltage (VCE(sat)) is 0.1V at IF=5mA and IC=1mA, important for logic-level interfacing. The -SD suffix specifies DIP-4 SMD (gull-wing leads). The -D3 suffix specifies the CTR rank (300-600%). The 5000Vrms isolation meets IEC 60747-5-2 for reinforced isolation. Applications include: SMPS feedback loops (voltage isolation from secondary to primary), AC zero-crossing detection, and logic signal isolation in motor drives.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>Anode<\/td>Input<\/td>LED anode (connects to current-limiting resistor, IF=5-50mA)<\/td><\/tr>
      2<\/td>Cathode<\/td>Input<\/td>LED cathode (connects to signal ground of driving side)<\/td><\/tr>
      3<\/td>Emitter<\/td>Output<\/td>Phototransistor emitter (output, LOW when LED is on)<\/td><\/tr>
      4<\/td>Collector<\/td>Output<\/td>Phototransistor collector (connects to pull-up resistor and load)<\/td><\/tr><\/table>","application_scenarios":"
    • Industrial control<\/li>
    • Consumer electronics<\/li>
    • Communication equipment<\/li>
    • Automotive electronics<\/li>","alternative_models":"
      Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
      onsemi<\/td>FOD817D3SD<\/td>DIP-4 SMD<\/td>Same device, onsemi brand<\/td><\/tr>
      Vishay<\/td>CNY17F-3<\/td>DIP-4<\/td>Phototransistor optocoupler, Vishay brand<\/td><\/tr>
      Everlight<\/td>EL817D<\/td>DIP-4<\/td>Phototransistor optocoupler, Everlight brand<\/td><\/tr>
      Sharp<\/td>PC817C<\/td>DIP-4<\/td>Phototransistor optocoupler, Sharp brand<\/td><\/tr>
      Toshiba<\/td>TLP785GB<\/td>DIP-4<\/td>Phototransistor optocoupler, Toshiba brand<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5612","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/comments?post=5612"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5612\/revisions"}],"predecessor-version":[{"id":6195,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5612\/revisions\/6195"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=5612"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=5612"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=5612"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=5612"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}