{"id":5476,"date":"2026-06-10T04:01:20","date_gmt":"2026-06-10T04:01:20","guid":{"rendered":"https:\/\/materialparts.com\/lm3940isx-3-3-nopb\/"},"modified":"2026-06-10T04:01:20","modified_gmt":"2026-06-10T04:01:20","slug":"lm3940isx-3-3-nopb","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/lm3940isx-3-3-nopb\/","title":{"rendered":"LM3940ISX-3.3\/NOPB"},"content":{"rendered":"

Productos<\/h2>\n

The LM3940ISX-3.3\/NOPB from Texas Instruments is a 1A low-dropout voltage regulator designed to provide 3.3V from a 5V supply in a TO-263 (DDPAK) surface-mount package. The ISX denotes the TO-263 package on tape and reel. With only 0.5V typical dropout at 1A, it maintains regulation with inputs as low as 4.5V, making it ideal for mixed 5V\/3.3V logic systems.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
Output Voltage<\/td>\n3.3V fixed<\/td>\n<\/tr>\n
Input Voltage<\/td>\n4.5V to 5.5V<\/td>\n<\/tr>\n
Corriente de salida<\/td>\n1A<\/td>\n<\/tr>\n
Dropout Voltage<\/td>\n310mV typical @ 1A<\/td>\n<\/tr>\n
Accuracy<\/td>\n2.5%<\/td>\n<\/tr>\n
Noise<\/td>\n150 uVrms<\/td>\n<\/tr>\n
PSRR<\/td>\n32dB @ 100kHz<\/td>\n<\/tr>\n
Iq<\/td>\n110uA typical<\/td>\n<\/tr>\n
Min Output Cap<\/td>\n33uF<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-40 to +125 C<\/td>\n<\/tr>\n
Paquete<\/td>\nTO-263-3 (DDPAK)<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • 1A output with 0.5V typical dropout<\/li>\n
  • Fixed 3.3V output for 5V-to-3.3V conversion<\/li>\n
  • Only one external component required (output capacitor)<\/li>\n
  • Thermal shutdown and short-circuit protection<\/li>\n
  • 2.5% output voltage accuracy over temperature<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • 5V to 3.3V logic level conversion<\/li>\n
    • Mixed-voltage microprocessor systems<\/li>\n
    • Battery-powered portable devices<\/li>\n
    • Post-regulation for switching supplies<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LM3940ISX-3.3\/NOPB from Texas Instruments is a 1A low-dropout voltage regulator designed to provide 3.3V from a 5V supply in a TO-263 (DDPAK) surface-mount package. The ISX denotes the TO-263 package on tape and reel. With only 0.5V typical dropout at 1A, it maintains regulation with inputs as low as 4.5V, making it […]<\/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":[138],"class_list":["post-5476","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","chip_brand-ti"],"acf":{"brief_explanation":"1A LDO, 5V to 3.3V, TO-263-3","date_code":"","package_case":"TO-263-3 (DDPAK, 10.16 x 15.24 mm)","in_stock":10189,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/lm3940.pdf","price":"$0.72 @ 1ku","product_introduction":"The LM3940ISX-3.3\/NOPB from Texas Instruments is a 1A low-dropout voltage regulator designed to provide 3.3V from a 5V supply in a TO-263 (DDPAK) surface-mount package. The ISX denotes the TO-263 package on tape and reel. With only 0.5V typical dropout at 1A, it maintains regulation with inputs as low as 4.5V, making it ideal for mixed 5V\/3.3V logic systems.","working_principle":"The LM3940ISX-3.3\/NOPB operates as described in the product overview. Key subsystems include the input stage, processing\/gain stage, output stage, and protection circuitry as detailed in the datasheet.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>
      1<\/td>VIN<\/td>Input<\/td>Unregulated input (4.5-5.5V)<\/td><\/tr>
      2<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>
      3<\/td>VOUT<\/td>Output<\/td>Regulated 3.3V output<\/td><\/tr>
      Tab<\/td>GND<\/td>Power<\/td>Ground\/thermal pad<\/td><\/tr><\/table>","application_scenarios":"
      • 5V to 3.3V logic level conversion<\/li>
      • Mixed-voltage microprocessor systems<\/li>
      • Battery-powered portable devices<\/li>
      • Post-regulation for switching supplies<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Package<\/th>Notes<\/th><\/tr>
        LM3940IMP-3.3\/NOPB<\/td>TI<\/td>SOT-223-4<\/td>Smaller package<\/td><\/tr>
        LD1117S33TR<\/td>ST<\/td>SOT-223<\/td>Lower cost alternative<\/td><\/tr>
        AMS1117-3.3<\/td>Advanced<\/td>SOT-223<\/td>Popular clone<\/td><\/tr>
        TLV1117LV33DCYR<\/td>TI<\/td>SOT-223<\/td>Lower Iq, wider Vin<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/5476","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/comments?post=5476"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/5476\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=5476"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=5476"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=5476"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=5476"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}