{"id":5846,"date":"2026-06-11T05:59:17","date_gmt":"2026-06-11T05:59:17","guid":{"rendered":"https:\/\/materialparts.com\/ld39050pu33r\/"},"modified":"2026-06-12T02:44:11","modified_gmt":"2026-06-12T02:44:11","slug":"ld39050pu33r","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/ld39050pu33r\/","title":{"rendered":"LD39050PU33R"},"content":{"rendered":"

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

The LD39050PU33R from ST is a 500mA 3.3V LDO with ultra-low 8uVrms noise, 70dB PSRR, and 100mV dropout in DFN-6 for RF and audio power supplies.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n
\u5305\u88c5<\/td>\nDFN-6 (2x2mm)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • See datasheet for complete specifications<\/li>\n
  • Industry-standard package<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Industrial control<\/li>\n
    • Consumer electronics<\/li>\n
    • Communication equipment<\/li>\n
    • Power management<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LD39050PU33R from ST is a 500mA 3.3V LDO with ultra-low 8uVrms noise, 70dB PSRR, and 100mV dropout in DFN-6 for RF and audio power supplies. Key Specifications Package DFN-6 (2x2mm) Features See datasheet for complete specifications Industry-standard package Applications Industrial control Consumer electronics Communication equipment Power management<\/p>","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-5846","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","chip_brand-st"],"acf":{"brief_explanation":"500mA LDO, 3.3V, ultra-low noise, DFN-6","date_code":"","package_case":"DFN-6 (2x2mm)","in_stock":14511,"datasheet":"https:\/\/www.st.com\/en\/power-management\/ld39050.html","price":"$0.50 @ 1ku","product_introduction":"The LD39050PU33R from ST is a 500mA 3.3V LDO with ultra-low 8uVrms noise, 70dB PSRR, and 100mV dropout in DFN-6 for RF and audio power supplies.","working_principle":"The LD39050PU33R is a 3.3V 500mA ultra-low-noise LDO from ST in DFN-6 (2x2mm). It achieves 8uVrms output noise (10Hz-100kHz) using a filtered voltage reference architecture. The NR (Noise Reduction) pin connects to an external 10nF capacitor that filters the internal bandgap reference noise before it reaches the error amplifier. Since the reference noise is the dominant noise source in an LDO, this filtering dramatically reduces total output noise compared to standard LDOs (which typically have 30-100uVrms). The PSRR is 75dB at 1kHz and 40dB at 100kHz, making it effective for RF and analog supply filtering. Dropout voltage is 200mV at 500mA (3.3V output requires VIN >= 3.5V). The PMOS pass transistor provides ground current of only 40uA (typical), independent of load current. The EN pin (active HIGH, internal pull-down) enables\/disables the output. In shutdown mode, quiescent current drops to 0.1uA. The DFN-6 package with exposed pad provides thermal resistance of 55C\/W. Applications include RF transceivers, VCO power, PLL supplies, and ADC\/DAC reference supplies where noise performance is critical.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>VIN<\/td>Input<\/td>Input voltage (2.0-5.5V)<\/td><\/tr>
      2<\/td>VOUT<\/td>Output<\/td>Regulated 3.3V output (500mA max)<\/td><\/tr>
      3<\/td>EN<\/td>Input<\/td>Enable (active high, internal pull-down)<\/td><\/tr>
      4<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>
      5<\/td>NR<\/td>Analog<\/td>Noise reduction capacitor (10nF for low noise)<\/td><\/tr>
      6<\/td>BYP<\/td>Analog<\/td>Bypass capacitor for reference (not connected)<\/td><\/tr><\/table>","application_scenarios":"
    • Industrial control<\/li>
    • Consumer electronics<\/li>
    • Communication equipment<\/li>
    • Power management<\/li>","alternative_models":"
      Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
      STMicroelectronics<\/td>LD39050M33R<\/td>DFN-6<\/td>Same device, different package option<\/td><\/tr>
      Texas Instruments<\/td>TPS73633DBVR<\/td>SOT-23-5<\/td>3.3V 400mA LDO, 20uVrms noise<\/td><\/tr>
      Analog Devices<\/td>ADP122AUJZ-3.3-R7<\/td>TSOT-26<\/td>3.3V 500mA LDO, 2.5uVrms noise<\/td><\/tr>
      Richtek<\/td>RT9013-33GB<\/td>SOT-23-5<\/td>3.3V 500mA LDO, low noise<\/td><\/tr>
      Microchip<\/td>MCP1824T-3302E\/OT<\/td>SOT-23-5<\/td>3.3V 300mA LDO, low noise<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5846","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=5846"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5846\/revisions"}],"predecessor-version":[{"id":5999,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5846\/revisions\/5999"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=5846"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=5846"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=5846"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=5846"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}