{"id":2446,"date":"2026-05-20T04:47:54","date_gmt":"2026-05-20T04:47:54","guid":{"rendered":"https:\/\/materialparts.com\/ldl1117s12r\/"},"modified":"2026-05-20T04:47:54","modified_gmt":"2026-05-20T04:47:54","slug":"ldl1117s12r","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/ldl1117s12r\/","title":{"rendered":"LDL1117S12R"},"content":{"rendered":"

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

The LDL1117S12R from STMicroelectronics is a 1.2A high-PSRR low-dropout linear voltage regulator with a fixed 1.2V output. It features 350mV typical dropout at full load, 87dB PSRR at 120Hz, 250uA typical quiescent current, and comprehensive protection in a SOT-223 package.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n
\u5236\u9020\u5546<\/td>\n\u610f\u6cd5\u534a\u5bfc\u4f53<\/td>\n<\/tr>\n
Output Voltage<\/td>\n1.2V (fixed, 1.185V nominal)<\/td>\n<\/tr>\n
\u8f93\u51fa\u7535\u6d41<\/td>\n1.2A<\/td>\n<\/tr>\n
\u8f93\u5165\u7535\u538b\u8303\u56f4<\/td>\n2.6V to 18V (20V AMR)<\/td>\n<\/tr>\n
Dropout Voltage<\/td>\n350mV typ @ 1.2A<\/td>\n<\/tr>\n
\u9759\u6001\u7535\u6d41<\/td>\n250uA typ<\/td>\n<\/tr>\n
PSRR<\/td>\n87dB @ 120Hz<\/td>\n<\/tr>\n
Output Noise<\/td>\n60uVrms<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSOT-223-4<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40C to +125C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Guaranteed 1.2A output current<\/li>\n
  • Low dropout: 350mV typical at 1.2A<\/li>\n
  • High PSRR: 87dB at 120Hz, >40dB at 100kHz<\/li>\n
  • Fixed 1.2V output (1.185V nominal)<\/li>\n
  • Low output noise: 60uVrms<\/li>\n
  • Internal current limit, SOA, and thermal protection<\/li>\n
  • Stable with ceramic output capacitors (1uF minimum)<\/li>\n
  • Compact SOT-223 surface-mount package<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • FPGA and CPLD core voltage regulation<\/li>\n
    • SMPS post-regulation and DC-DC converter secondary regulation<\/li>\n
    • Consumer and industrial power supplies<\/li>\n
    • Low-voltage digital IC power rails<\/li>\n
    • Point-of-load regulation on motherboards<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LDL1117S12R from STMicroelectronics is a 1.2A high-PSRR low-dropout linear voltage regulator with a fixed 1.2V output. It features 350mV typical dropout at full load, 87dB PSRR at 120Hz, 250uA typical quiescent current, and comprehensive protection in a SOT-223 package. Key Specifications Manufacturer STMicroelectronics Output Voltage 1.2V (fixed, 1.185V nominal) Output Current 1.2A […]<\/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-2446","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","chip_brand-st"],"acf":{"brief_explanation":"1.2A LDO, 1.2V fixed, 350mV dropout, 87dB PSRR, 2.6-18V input, SOT-223","date_code":"","package_case":"SOT-223-4 (6.7 x 3.7 x 1.7 mm)","in_stock":7650,"datasheet":"https:\/\/www.st.com\/en\/power-management\/ldl1117.html","price":"$0.11 @ 1ku","product_introduction":"The STMicroelectronics LDL1117S12R is a 1.2A high-PSRR low-dropout linear voltage regulator providing a fixed 1.2V output from an input voltage range of 2.6V to 18V. The 1.2V output is well-suited for modern low-voltage FPGA, CPLD, and microcontroller core supply requirements. With a typical dropout voltage of 350mV at 1.2A, it can regulate efficiently from low input voltages. The high PSRR of 87dB at 120Hz and greater than 40dB at 100kHz makes it ideal for cleaning noisy switch-mode supply outputs. The device includes internal current limit, safe operating area, and thermal shutdown protection. It is stable with ceramic output capacitors from 1uF to 100uF.","working_principle":"The LDL1117S12R operates as a series-pass linear voltage regulator with three key subsystems: 1) Reference and Error Amplifier: A bandgap voltage reference provides the stable reference voltage. The error amplifier compares a fraction of the output with this reference and drives the pass element to maintain regulation at 1.2V. 2) Pass Element: The internal NPN pass transistor provides the current path from VIN to VOUT with low dropout voltage. At 1.2A load, the typical dropout is 350mV. 3) Protection: Current limiting protects against short circuits, SOA protection ensures safe operation during transients, and thermal shutdown disables the output when the junction temperature exceeds the safe limit. The high PSRR is achieved through the internal bias generator and well-compensated error amplifier design.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>GND<\/td>Ground<\/td>Ground connection<\/td><\/tr>
      2<\/td>VOUT<\/td>Output<\/td>Regulated 1.2V output; tab connected internally<\/td><\/tr>
      3<\/td>VIN<\/td>Input<\/td>Unregulated input voltage (2.6V to 18V)<\/td><\/tr>
      4 (Tab)<\/td>VOUT<\/td>Output<\/td>Output connection \/ thermal pad<\/td><\/tr><\/table>","application_scenarios":"
      • Low-voltage FPGA and CPLD core power supply regulation at 1.2V<\/li>
      • SMPS post-regulation for noise-sensitive low-voltage digital circuits<\/li>
      • Point-of-load 1.2V regulation on motherboards and embedded systems<\/li>
      • DC-DC converter secondary regulation with high PSRR requirements<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        ST<\/td>LDL1117S25R<\/td>SOT-223<\/td>2.5V version, same series<\/td><\/tr>
        ST<\/td>LDL1117S18R<\/td>SOT-223<\/td>1.8V version, same series<\/td><\/tr>
        TI<\/td>TLV1117LV12DCYR<\/td>SOT-223<\/td>1.5A, 1.2V LDO, lower Iq<\/td><\/tr>
        onsemi<\/td>NCP1117ST12T3G<\/td>SOT-223<\/td>1A, 1.2V LDO<\/td><\/tr>
        TI<\/td>TLV76112DCYR<\/td>SOT-223<\/td>1A, 1.2V, newer device<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/2446","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=2446"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/2446\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=2446"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=2446"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=2446"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=2446"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}