{"id":9944,"date":"2026-07-08T01:19:17","date_gmt":"2026-07-08T01:19:17","guid":{"rendered":"https:\/\/materialparts.com\/ncp1117dt33rkg\/"},"modified":"2026-07-08T01:19:17","modified_gmt":"2026-07-08T01:19:17","slug":"ncp1117dt33rkg","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/ncp1117dt33rkg\/","title":{"rendered":"NCP1117DT33RKG"},"content":{"rendered":"

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

The onsemi NCP1117DT33RKG is a 1A low-dropout (LDO) linear voltage regulator providing a fixed 3.3V output. With a maximum dropout voltage of 1.2V at 800mA, it can operate from input voltages up to 20V. The DPAK package provides excellent thermal performance for applications requiring moderate output current.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n
Output Voltage<\/td>\n3.3V (fixed)<\/td>\n<\/tr>\n
Maximum Output Current<\/td>\n1A<\/td>\n<\/tr>\n
Dropout Voltage<\/td>\n1.2V max at 800mA<\/td>\n<\/tr>\n
\u8f93\u5165\u7535\u538b\u8303\u56f4<\/td>\n4.5V to 20V<\/td>\n<\/tr>\n
Output Accuracy<\/td>\n\u00b11.0%<\/td>\n<\/tr>\n
\u9759\u6001\u7535\u6d41<\/td>\n5mA (typical)<\/td>\n<\/tr>\n
Current Limiting<\/td>\nYes<\/td>\n<\/tr>\n
Thermal Shutdown<\/td>\nYes (150\u00b0C)<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nDPAK (DT)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u00b0C to +125\u00b0C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 1A output current<\/li>\n
  • 3.3V fixed output with \u00b11% accuracy<\/li>\n
  • Low dropout: 1.2V at 800mA<\/li>\n
  • No minimum load requirement<\/li>\n
  • Internal current limiting and thermal shutdown<\/li>\n
  • Direct replacement for LM1117<\/li>\n
  • DPAK package for good thermal dissipation<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • 3.3V logic power supply from 5V<\/li>\n
    • Post-regulation for switch-mode supplies<\/li>\n
    • \u7535\u6c60\u4f9b\u7535\u8bbe\u5907<\/li>\n
    • Consumer electronics<\/li>\n
    • Industrial control systems<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The onsemi NCP1117DT33RKG is a 1A low-dropout (LDO) linear voltage regulator providing a fixed 3.3V output. With a maximum dropout voltage of 1.2V at 800mA, it can operate from input voltages up to 20V. The DPAK package provides excellent thermal performance for applications requiring moderate output current. Key Specifications Output Voltage 3.3V (fixed) […]<\/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":[13,32],"tags":[1241],"chip_brand":[144],"class_list":["post-9944","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","tag-ncp1117dt33rkg","chip_brand-on"],"acf":{"brief_explanation":"1A LDO, 3.3V fixed, 1.2V dropout, 20V max input, DPAK, onsemi NCP1117 series","date_code":"","package_case":"DPAK (DT, 6.5 x 5.5 x 2.3mm)","in_stock":7393,"datasheet":"https:\/\/www.onsemi.com\/pub\/Collateral\/NCP1117-D.PDF","price":"$0.38 @ 1ku","product_introduction":"The onsemi NCP1117DT33RKG is a 1A LDO linear regulator providing a fixed 3.3V output with \u00b11% accuracy. As a direct replacement for the industry-standard LM1117, it features low dropout voltage (1.2V max at 800mA), internal current limiting, and thermal shutdown protection. The DPAK package provides good thermal dissipation for the 1A output current capability.","working_principle":"The NCP1117DT33RKG uses a PNP pass transistor in a low-dropout configuration, allowing the output voltage to be maintained with only 1.2V of headroom at 800mA load. The internal bandgap reference provides the \u00b11% output voltage accuracy. On-chip trimming during manufacturing ensures the output voltage is within specification. The current limiting circuit protects against output short circuits, while the thermal shutdown activates at approximately 150\u00b0C junction temperature to prevent damage.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>GND<\/td>Ground<\/td>Ground and thermal pad<\/td><\/tr>
      2<\/td>VOUT<\/td>Output<\/td>3.3V regulated output<\/td><\/tr>
      3<\/td>VIN<\/td>Input<\/td>Input supply (4.5-20V)<\/td><\/tr><\/table>","application_scenarios":"
      • 3.3V logic supply from 5V USB power<\/li>
      • Switch-mode supply post-regulation<\/li>
      • Battery-powered device 3.3V rail<\/li>
      • Consumer electronics power management<\/li>
      • Industrial controller 3.3V supply<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        TI<\/td>LM1117MP-3.3\/NOPB<\/td>SOT-223<\/td>Industry standard equivalent<\/td><\/tr>
        onsemi<\/td>NCP1117ST33T3G<\/td>SOT-223<\/td>Same function, SOT-223 pkg<\/td><\/tr>
        Microchip<\/td>MCP1827-3302E\/DB<\/td>SOT-223<\/td>Low Iq alternative<\/td><\/tr>
        Diodes Inc<\/td>AZ1117EH-3.3TRG1<\/td>SOT-223<\/td>Cost-effective alternative<\/td><\/tr>
        onsemi<\/td>NCP1117DT50RKG<\/td>DPAK<\/td>5.0V version<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/9944","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=9944"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/9944\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=9944"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=9944"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=9944"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=9944"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}