{"id":6608,"date":"2026-06-18T15:38:22","date_gmt":"2026-06-18T15:38:22","guid":{"rendered":"https:\/\/materialparts.com\/ams1117-3-3-2\/"},"modified":"2026-06-18T15:38:22","modified_gmt":"2026-06-18T15:38:22","slug":"ams1117-3-3-2","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/ams1117-3-3-2\/","title":{"rendered":"AMS1117-3.3"},"content":{"rendered":"

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

The AMS1117-3.3 is a 1A low-dropout (LDO) voltage regulator providing a fixed 3.3V output. Manufactured by Advanced Monolithic Systems, it is a popular industry-standard LDO known for its reliability and ease of use. Packaged in SOT-223, it features low dropout voltage, current limiting, and thermal shutdown protection for robust power supply designs.<\/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, \u00b11% or \u00b12%)<\/td>\n<\/tr>\n
Maximum Output Current<\/td>\n1A<\/td>\n<\/tr>\n
\u8f93\u5165\u7535\u538b\u8303\u56f4<\/td>\n4.5V to 15V<\/td>\n<\/tr>\n
Dropout Voltage<\/td>\n1.1V @ 800 mA<\/td>\n<\/tr>\n
Line Regulation<\/td>\n0.2% (max)<\/td>\n<\/tr>\n
Load Regulation<\/td>\n0.4% (max)<\/td>\n<\/tr>\n
\u9759\u6001\u7535\u6d41<\/td>\n5 mA (typical)<\/td>\n<\/tr>\n
Ripple Rejection<\/td>\n60 dB @ 120 Hz<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u00b0C to +125\u00b0C (junction)<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSOT-223 (6.5\u00d73.5\u00d71.8 mm)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 1A output current capability<\/li>\n
  • Low dropout voltage: 1.1V at 800 mA<\/li>\n
  • Fixed 3.3V output with tight tolerance<\/li>\n
  • Internal current limiting and thermal shutdown<\/li>\n
  • Stable with tantalum or aluminum output capacitors (10 \u00b5F min)<\/li>\n
  • SOT-223 package with thermal tab for heat dissipation<\/li>\n
  • Industry-standard pinout compatible with 1117 family<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • 5V to 3.3V logic level conversion power supply<\/li>\n
    • Embedded system point-of-load regulation<\/li>\n
    • Battery charger and power management<\/li>\n
    • Arduino and development board 3.3V rail<\/li>\n
    • Consumer electronics and set-top box power<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The AMS1117-3.3 is a 1A low-dropout (LDO) voltage regulator providing a fixed 3.3V output. Manufactured by Advanced Monolithic Systems, it is a popular industry-standard LDO known for its reliability and ease of use. Packaged in SOT-223, it features low dropout voltage, current limiting, and thermal shutdown protection for robust power supply designs. Key […]<\/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":[],"chip_brand":[297],"class_list":["post-6608","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","chip_brand-advanced-monolithic"],"acf":{"brief_explanation":"1A LDO, 3.3V fixed, 1.1V dropout, SOT-223","date_code":"","package_case":"SOT-223 (6.5\u00d73.5\u00d71.8 mm)","in_stock":22100,"datasheet":"https:\/\/datasheet.lcsc.com\/lcsc\/1811021917_Advanced-Monolithic-Systems-AMS1117-ADJ_C6188.pdf","price":"$0.12 @ 1ku","product_introduction":"The AMS1117-3.3 from Advanced Monolithic Systems is a widely used 1A low-dropout voltage regulator providing a fixed 3.3V output. With a dropout voltage of only 1.1V at 800 mA, it efficiently converts 5V to 3.3V for logic level power supply. The SOT-223 package features a thermal tab for effective heat dissipation, while internal current limiting and thermal shutdown ensure reliable operation. It is an industry-standard LDO found in countless embedded and consumer designs.","working_principle":"The AMS1117-3.3 uses a PNP pass transistor in a common-emitter (LDO) configuration with an internal bandgap reference set to 3.3V. The error amplifier compares the output voltage (sensed via an internal resistor divider) with the reference and adjusts the PNP pass transistor drive to maintain regulation. The low dropout is achieved because the PNP transistor saturation voltage can be very low compared to NPN-based regulators. Internal current limiting senses the pass transistor current and limits it to approximately 1.2A, while thermal shutdown disables the output at approximately 150\u00b0C junction temperature.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>\n
      1<\/td>GND\/ADJ<\/td>Power<\/td>Ground (fixed version) or adjust (adj version)<\/td><\/tr>\n
      2<\/td>VOUT<\/td>Output<\/td>Regulated 3.3V output (also thermal tab)<\/td><\/tr>\n
      3<\/td>VIN<\/td>Input<\/td>Input voltage (4.5-15V)<\/td><\/tr>\n<\/table>","application_scenarios":"
        \n
      • 5V to 3.3V logic level power conversion for MCU and FPGA designs<\/li>\n
      • Embedded system 3.3V point-of-load regulation<\/li>\n
      • Arduino, Raspberry Pi, and development board 3.3V power rails<\/li>\n
      • Consumer electronics including set-top boxes and routers<\/li>\n
      • Battery-powered device power management from 4.5V+ sources<\/li>\n<\/ul>","alternative_models":"\n
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>\n
        TI<\/td>AMS1117-3.3<\/td>SOT-223<\/td>TI-manufactured equivalent<\/td><\/tr>\n
        Diodes Inc<\/td>AP1117E33G-13<\/td>SOT-223<\/td>Pin-compatible, 1A LDO<\/td><\/tr>\n
        Micrel\/Microchip<\/td> MIC39100-3.3WS<\/td>SOT-223<\/td>1A, ultra-low dropout<\/td><\/tr>\n
        ON Semiconductor<\/td>NCP1117DT33G<\/td>SOT-223<\/td>1A LDO, 3.3V fixed<\/td><\/tr>\n
        Infineon<\/td>TLE4274D<\/td>SOT-223<\/td>Automotive qualified alternative<\/td><\/tr>\n<\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6608","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=6608"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6608\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=6608"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=6608"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=6608"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=6608"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}