{"id":5788,"date":"2026-06-11T05:29:58","date_gmt":"2026-06-11T05:29:58","guid":{"rendered":"https:\/\/materialparts.com\/l7812cv\/"},"modified":"2026-06-11T06:58:58","modified_gmt":"2026-06-11T06:58:58","slug":"l7812cv","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/l7812cv\/","title":{"rendered":"L7812CV"},"content":{"rendered":"

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

The L7812CV from ST is a 12V fixed 1.5A positive voltage regulator with internal current limiting, thermal shutdown, and 2V typical dropout in TO-220 for linear power supply regulation.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n
\u8f93\u51fa<\/td>\n12V fixed<\/td>\n<\/tr>\n
\u8f93\u51fa\u7535\u6d41<\/td>\n1.5A<\/td>\n<\/tr>\n
Input Range<\/td>\n14.5-35V<\/td>\n<\/tr>\n
Dropout<\/td>\n2V typ<\/td>\n<\/tr>\n
Regulation<\/td>\n+\/-2%<\/td>\n<\/tr>\n
Temp<\/td>\n-40~125C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 12V fixed output<\/li>\n
  • 1.5A output current<\/li>\n
  • Internal current limiting<\/li>\n
  • Thermal shutdown<\/li>\n
  • Output transistor safe area protection<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Linear power supplies<\/li>\n
    • Board-level regulation<\/li>\n
    • Industrial control<\/li>\n
    • Audio amplifiers<\/li>\n
    • Battery chargers<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The L7812CV from ST is a 12V fixed 1.5A positive voltage regulator with internal current limiting, thermal shutdown, and 2V typical dropout in TO-220 for linear power supply regulation. Key Specifications Output 12V fixed Output Current 1.5A Input Range 14.5-35V Dropout 2V typ Regulation +\/-2% Temp -40~125C Features 12V fixed output 1.5A output […]<\/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":[13,32],"tags":[],"chip_brand":[142],"class_list":["post-5788","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","chip_brand-st"],"acf":{"brief_explanation":"12V 1.5A positive LDO, TO-220","date_code":"","package_case":"TO-220-3","in_stock":6541,"datasheet":"https:\/\/www.st.com\/en\/power-management\/l7812cv.html","price":"$0.50 @ 1ku","product_introduction":"The L7812CV from ST is a 12V fixed 1.5A positive voltage regulator with internal current limiting, thermal shutdown, and 2V typical dropout in TO-220 for linear power supply regulation.","working_principle":"The L7812CV is a 12V fixed positive voltage regulator from ST in TO-220, delivering up to 1.5A output current. It uses a series-pass NPN transistor controlled by a feedback loop: an internal bandgap reference (approximately 7V) is compared against a divided-down version of the output voltage. The error amplifier drives the series-pass transistor to maintain VOUT at 12V +\/-2% (for the AB version). The dropout voltage is approximately 2V at 1A, requiring VIN >= 14.5V for proper regulation. Internal protection includes: thermal shutdown at 150C junction temperature, output short-circuit current limiting (typically 2.1A peak), and safe operating area (SOA) protection that limits current when VIN-VOUT differential is large. The device requires external capacitors: 0.33uF on input for stability and 0.1uF on output for transient response. Quiescent current is 5mA typical, which flows regardless of load.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>IN<\/td>Input<\/td>Unregulated input voltage (14.5-27V)<\/td><\/tr>
      2<\/td>GND<\/td>Power<\/td>Ground (common, tab)<\/td><\/tr>
      3<\/td>OUT<\/td>Output<\/td>Regulated 12V output (up to 1.5A)<\/td><\/tr><\/table>","application_scenarios":"
    • Linear power supplies<\/li>
    • Board-level regulation<\/li>
    • Industrial control<\/li>
    • Audio amplifiers<\/li>
    • Battery chargers<\/li>","alternative_models":"
      Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
      STMicroelectronics<\/td>L7812ABV<\/td>TO-220<\/td>Higher precision (2% tolerance)<\/td><\/tr>
      Texas Instruments<\/td>UA7812CKTTR<\/td>D2PAK<\/td>SMD equivalent, 1A<\/td><\/tr>
      onsemi<\/td>MC7812ECTG<\/td>TO-220<\/td>Direct equivalent from onsemi<\/td><\/tr>
      Infineon<\/td>TLE4274G<\/td>TO-252<\/td>Automotive 12V LDO, SMD<\/td><\/tr>
      Microchip<\/td>MCP1827-1202E\/AB<\/td>SOT-223<\/td>1.5A LDO, low dropout alternative<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5788","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=5788"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5788\/revisions"}],"predecessor-version":[{"id":5938,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5788\/revisions\/5938"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=5788"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=5788"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=5788"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=5788"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}