{"id":3197,"date":"2026-05-31T03:20:42","date_gmt":"2026-05-31T03:20:42","guid":{"rendered":"https:\/\/materialparts.com\/lm1085isx-3-3-nopb\/"},"modified":"2026-06-06T03:28:50","modified_gmt":"2026-06-06T03:28:50","slug":"lm1085isx-3-3-nopb","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/lm1085isx-3-3-nopb\/","title":{"rendered":"LM1085ISX-3.3\/NOPB"},"content":{"rendered":"

Productos<\/h2>\n

The LM1085ISX-3.3\/NOPB from Texas Instruments is the lead-free (Pb-free) variant of the 3 A low-dropout positive voltage regulator with fixed 3.3 V output. Featuring a maximum dropout of 1.5 V at 3 A, current limiting, and thermal shutdown, it is supplied in a TO-263 (D2PAK) package on tape and reel. The NOPB suffix indicates Pb-free terminal finish.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n
Output Voltage<\/td>\n3.3 V (fixed)<\/td>\n<\/tr>\n
Corriente de salida<\/td>\n3 A<\/td>\n<\/tr>\n
Dropout Voltage<\/td>\n1.3 V typical, 1.5 V max @ 3 A<\/td>\n<\/tr>\n
Input Voltage Range<\/td>\n4.8 V to 27 V<\/td>\n<\/tr>\n
Line Regulation<\/td>\n0.015% typical<\/td>\n<\/tr>\n
Load Regulation<\/td>\n0.1% typical<\/td>\n<\/tr>\n
PSRR<\/td>\n72 dB at 120 Hz<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-40\u00b0C to 125\u00b0C<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • 3 A output current capability<\/li>\n
  • Low dropout voltage: 1.3 V typical at 3 A<\/li>\n
  • Fixed 3.3 V output with high accuracy<\/li>\n
  • Internal current limiting and thermal shutdown protection<\/li>\n
  • Zener trimmed bandgap reference<\/li>\n
  • Pb-free terminal finish (NOPB)<\/li>\n
  • TO-263 surface-mount package on tape and reel<\/li>\n
  • Pin-compatible with LM317 footprint<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • 3.3 V logic power supply regulation<\/li>\n
    • Post-regulation for switching power supplies<\/li>\n
    • Battery-powered systems and chargers<\/li>\n
    • Embedded processor and FPGA core power<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LM1085ISX-3.3\/NOPB from Texas Instruments is the lead-free (Pb-free) variant of the 3 A low-dropout positive voltage regulator with fixed 3.3 V output. Featuring a maximum dropout of 1.5 V at 3 A, current limiting, and thermal shutdown, it is supplied in a TO-263 (D2PAK) package on tape and reel. The NOPB suffix […]<\/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-3197","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","chip_brand-ti"],"acf":{"brief_explanation":"3 A LDO regulator, 3.3 V fixed, 1.3 V dropout, Pb-free, TO-263 tape and reel","date_code":"","package_case":"TO-263-3 (D2PAK, 10.16 x 8.64 mm)","in_stock":5400,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/lm1085.pdf","price":"$0.79 @ 1ku","product_introduction":"The LM1085ISX-3.3\/NOPB is the lead-free variant of the LM1085 3 A low-dropout positive voltage regulator from Texas Instruments. It provides a fixed 3.3 V output with a maximum dropout voltage of 1.5 V at the full 3 A load, making it well-suited for 5 V to 3.3 V conversion in mixed-voltage digital systems. The NOPB suffix indicates that the device uses a Pb-free terminal finish (tin), complying with RoHS requirements for lead-free assembly. The regulator incorporates a zener-trimmed bandgap reference for excellent output voltage accuracy, along with internal current limiting and thermal shutdown circuits for robust fault protection. The TO-263 (D2PAK) package provides excellent thermal dissipation capability in a surface-mount footprint, and the tape-and-reel packaging supports automated SMT assembly processes.","working_principle":"The LM1085ISX-3.3\/NOPB operates as a series pass linear regulator with three control loops: (1) The voltage regulation loop compares the output voltage with an internal bandgap reference. For the fixed 3.3 V version, an internal resistor divider sets the output voltage, and the error amplifier drives the PNP pass transistor to maintain regulation. (2) The current limiting circuit monitors the pass transistor current and reduces the gate drive when the current exceeds the safe operating limit, protecting against output overloads and short circuits. (3) The thermal protection circuit monitors the junction temperature and shuts down the pass transistor at approximately 165\u00b0C, with automatic recovery when the temperature drops below the hysteresis threshold. The low dropout architecture uses a PNP pass element that can operate in saturation with minimal VCE, enabling regulation with input-output differentials as low as 1.3 V.","pin_description":"
      Pin No.<\/td>Pin Name<\/td>Function<\/td><\/tr>
      1<\/td>ADJ\/GND<\/td>Ground connection (fixed voltage version)<\/td><\/tr>
      2<\/td>VOUT<\/td>Regulated 3.3 V output<\/td><\/tr>
      3<\/td>VIN<\/td>Unregulated input supply (4.8 V to 27 V)<\/td><\/tr>
      Tab<\/td>VOUT<\/td>Output tab (connected to pin 2, aids thermal dissipation)<\/td><\/tr><\/table>","application_scenarios":"
      • 5 V to 3.3 V power conversion in RoHS-compliant embedded systems requiring Pb-free components<\/li>
      • Post-regulation for switch-mode power supplies in telecom and networking equipment<\/li>
      • FPGA and microcontroller core voltage regulation where 3 A current and low dropout are required<\/li>
      • Industrial and automotive systems needing robust thermal and overcurrent protection in a surface-mount LDO<\/li><\/ul>","alternative_models":"
        Model<\/td>Brand<\/td>Output<\/td>Max Current<\/td>Lead-Free<\/td><\/tr>
        LM1085IS-3.3\/NOPB<\/td>TI<\/td>3.3 V<\/td>3 A<\/td>Yes<\/td><\/tr>
        LM1085ISX-3.3<\/td>TI<\/td>3.3 V<\/td>3 A<\/td>Sn finish<\/td><\/tr>
        LM1084ISX-3.3\/NOPB<\/td>TI<\/td>3.3 V<\/td>5 A<\/td>Yes<\/td><\/tr>
        LM1117SX-3.3\/NOPB<\/td>TI<\/td>3.3 V<\/td>0.8 A<\/td>Yes<\/td><\/tr>
        LT1085CM-3.3#PBF<\/td>ADI<\/td>3.3 V<\/td>3 A<\/td>Yes<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/3197","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=3197"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/3197\/revisions"}],"predecessor-version":[{"id":3278,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/3197\/revisions\/3278"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=3197"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=3197"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=3197"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=3197"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}