{"id":5759,"date":"2026-06-11T04:40:33","date_gmt":"2026-06-11T04:40:33","guid":{"rendered":"https:\/\/materialparts.com\/1812l200thpr\/"},"modified":"2026-06-11T06:40:39","modified_gmt":"2026-06-11T06:40:39","slug":"1812l200thpr","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/1812l200thpr\/","title":{"rendered":"1812L200THPR"},"content":{"rendered":"

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

The 1812L200THPR from Littelfuse is a 2A 33V resettable PTC (polyfuse) in 1812 surface-mount package for overcurrent protection in USB and I\/O ports.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n
\u5305\u88c5<\/td>\n1812 (4.5×3.2mm)<\/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
    • Power management<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The 1812L200THPR from Littelfuse is a 2A 33V resettable PTC (polyfuse) in 1812 surface-mount package for overcurrent protection in USB and I\/O ports. Key Specifications Package 1812 (4.5×3.2mm) Features See datasheet for complete specifications Industry-standard package Applications Industrial control Consumer electronics Communication equipment Power management<\/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":[57,13],"tags":[],"chip_brand":[200],"class_list":["post-5759","post","type-post","status-publish","format-standard","hentry","category-insulated-gate-bipolar-transistors-igbt","category-integrated-circuits-ics","chip_brand-littelfuse"],"acf":{"brief_explanation":"2A 33V resettable PTC fuse, 1812","date_code":"","package_case":"1812 (4.5x3.2mm)","in_stock":5308,"datasheet":"https:\/\/www.littelfuse.com\/media\/littelfuse\/data-sheets\/littelfuse_1812l.pdf","price":"$0.25 @ 1ku","product_introduction":"The 1812L200THPR from Littelfuse is a 2A 33V resettable PTC (polyfuse) in 1812 surface-mount package for overcurrent protection in USB and I\/O ports.","working_principle":"The 1812L200THPR is a surface-mount resettable PTC (polymeric positive temperature coefficient) fuse from Littelfuse with 2A hold current and 33V maximum voltage in 1812 (4532 metric) package. The device uses a composite of crystalline polymer and conductive carbon particles. At normal temperatures, carbon particles form conductive chains providing low resistance (typically 0.1-0.5 Ohm). When overcurrent occurs, self-heating raises the polymer above its crystalline transition temperature (approximately 125C). The polymer expands, breaking the carbon chains and dramatically increasing resistance (by 3-4 orders of magnitude), which limits current to a low leakage value. When the fault is removed and the device cools, the polymer recrystallizes and carbon chains reform, restoring low-resistance operation. The hold current (2A) is the maximum that does not trip the device; the trip current (approximately 4A at 20C) guarantees tripping.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>Terminal 1<\/td>Terminal<\/td>PTC element terminal 1<\/td><\/tr>
      2<\/td>Terminal 2<\/td>Terminal<\/td>PTC element terminal 2<\/td><\/tr><\/table>","application_scenarios":"
    • Industrial control<\/li>
    • Consumer electronics<\/li>
    • Communication equipment<\/li>
    • Power management<\/li>","alternative_models":"
      Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
      Littelfuse<\/td>1812L110THPR<\/td>1812<\/td>1.1A hold, 33V version<\/td><\/tr>
      Bourns<\/td>MF-MSMF200-2<\/td>1812<\/td>2A hold, 33V, direct equivalent<\/td><\/tr>
      TE Connectivity<\/td>2-1812L200DR<\/td>1812<\/td>2A hold, surface-mount PTC<\/td><\/tr>
      Schurter<\/td>PTC-SMD1812-200-33V<\/td>1812<\/td>2A hold, 33V resettable fuse<\/td><\/tr>
      Littelfuse<\/td>1812L150THPR<\/td>1812<\/td>1.5A hold, 33V version<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5759","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=5759"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5759\/revisions"}],"predecessor-version":[{"id":5909,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5759\/revisions\/5909"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=5759"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=5759"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=5759"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=5759"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}