{"id":5332,"date":"2026-06-09T11:29:22","date_gmt":"2026-06-09T11:29:22","guid":{"rendered":"https:\/\/materialparts.com\/ltv-357t-b\/"},"modified":"2026-06-09T11:29:22","modified_gmt":"2026-06-09T11:29:22","slug":"ltv-357t-b","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/ltv-357t-b\/","title":{"rendered":"LTV-357T-B"},"content":{"rendered":"

\u0646\u0638\u0631\u0629 \u0639\u0627\u0645\u0629 \u0639\u0644\u0649 \u0627\u0644\u0645\u0646\u062a\u062c<\/h2>\n

LTV-357T-B from Lite-On is a single-channel phototransistor optocoupler with CTR 130-260% @ 5mA, 3750Vrms isolation, 35V VCEO, 50mA output current. SOP-4 surface-mount. -B suffix = high CTR rank.<\/p>\n

\u0645\u0628\u062f\u0623 \u0627\u0644\u0639\u0645\u0644<\/h2>\n

Infrared LED on input side emits light to phototransistor on output side, providing galvanic isolation. CTR (Current Transfer Ratio) determines output current for given LED current. B-rank guarantees 130-260% CTR at IF=5mA. 3750Vrms isolation between input and output.<\/p>\n

Pin Description<\/h2>\n\n\n\n\n\n\n
\u062f\u0628\u0648\u0633<\/th>\n\u0627\u0644\u0627\u0633\u0645<\/th>\n\u0627\u0644\u0648\u0638\u064a\u0641\u0629<\/th>\n<\/tr>\n
1<\/td>\n\u0627\u0644\u0623\u0646\u0648\u062f<\/td>\nLED anode<\/td>\n<\/tr>\n
2<\/td>\n\u0627\u0644\u0642\u0637\u0628 \u0627\u0644\u0633\u0627\u0644\u0628<\/td>\nLED cathode<\/td>\n<\/tr>\n
3<\/td>\n\u0627\u0644\u0628\u0627\u0639\u062b<\/td>\nPhototransistor emitter<\/td>\n<\/tr>\n
4<\/td>\n\u062c\u0627\u0645\u0639 \u0627\u0644\u062a\u062d\u0635\u064a\u0644<\/td>\nPhototransistor collector<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
    \n
  • Signal isolation<\/li>\n
  • PLC I\/O isolation<\/li>\n
  • Power supply feedback<\/li>\n
  • Industrial control<\/li>\n<\/ul>\n

    Alternative Models<\/h2>\n\n\n\n\n
    Mfr<\/th>\nPart<\/th>\n\u0627\u0644\u0645\u0644\u0627\u062d\u0638\u0627\u062a<\/th>\n<\/tr>\n
    Sharp<\/td>\nPC817B<\/td>\nDIP-4 equivalent<\/td>\n<\/tr>\n
    \u0641\u064a\u0634\u0627\u064a<\/td>\nSFH615A-3<\/td>\nSimilar CTR<\/td>\n<\/tr>\n<\/table>","protected":false},"excerpt":{"rendered":"

    Product Overview LTV-357T-B from Lite-On is a single-channel phototransistor optocoupler with CTR 130-260% @ 5mA, 3750Vrms isolation, 35V VCEO, 50mA output current. SOP-4 surface-mount. -B suffix = high CTR rank. Working Principle Infrared LED on input side emits light to phototransistor on output side, providing galvanic isolation. CTR (Current Transfer Ratio) determines output current for […]<\/p>\n","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":[212],"class_list":["post-5332","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-liteon"],"acf":{"brief_explanation":"1-ch optocoupler, CTR 130-260%, 3750Vrms, SOP-4","date_code":"","package_case":"SOP-4 (3.85x4.40x2.10mm)","in_stock":10520,"datasheet":"https:\/\/www.liteon.com\/opto\/pdf\/LTV-357T.pdf","price":"$0.17 @ 1ku","product_introduction":"LTV-357T-B from Lite-On is a single-channel phototransistor optocoupler with CTR 130-260% @ 5mA, 3750Vrms isolation, 35V VCEO, 50mA output current. SOP-4 surface-mount. -B suffix = high CTR rank.","working_principle":"Infrared LED on input side emits light to phototransistor on output side, providing galvanic isolation. CTR (Current Transfer Ratio) determines output current for given LED current. B-rank guarantees 130-260% CTR at IF=5mA. 3750Vrms isolation between input and output.","pin_description":"
    Pin<\/th>Name<\/th>Function<\/th><\/tr>
    1<\/td>Anode<\/td>LED anode<\/td><\/tr>
    2<\/td>Cathode<\/td>LED cathode<\/td><\/tr>
    3<\/td>Emitter<\/td>Phototransistor emitter<\/td><\/tr>
    4<\/td>Collector<\/td>Phototransistor collector<\/td><\/tr><\/table>","application_scenarios":"
    • Signal isolation<\/li>
    • PLC I\/O isolation<\/li>
    • Power supply feedback<\/li>
    • Industrial control<\/li><\/ul>","alternative_models":"
      Mfr<\/th>Part<\/th>Notes<\/th><\/tr>
      Sharp<\/td>PC817B<\/td>DIP-4 equivalent<\/td><\/tr>
      Vishay<\/td>SFH615A-3<\/td>Similar CTR<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/5332","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/comments?post=5332"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/5332\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=5332"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=5332"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=5332"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=5332"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}