{"id":6268,"date":"2026-06-12T10:29:49","date_gmt":"2026-06-12T10:29:49","guid":{"rendered":"https:\/\/materialparts.com\/ncp1117dt33t5g\/"},"modified":"2026-06-12T10:29:49","modified_gmt":"2026-06-12T10:29:49","slug":"ncp1117dt33t5g","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/ncp1117dt33t5g\/","title":{"rendered":"NCP1117DT33T5G"},"content":{"rendered":"

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

The NCP1117DT33T5G from onsemi is a 3.3V fixed-output LDO voltage regulator capable of delivering up to 1A output current. With a dropout voltage of 1.2V at 800mA and internal current limiting, it is available in a DPAK-3 surface-mount package suitable for industrial applications.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n
Output Voltage<\/td>\n3.3V (fixed, +\/-1%)<\/td>\n<\/tr>\n
\u8f93\u51fa\u7535\u6d41<\/td>\n1A (max)<\/td>\n<\/tr>\n
\u8f93\u5165\u7535\u538b\u8303\u56f4<\/td>\n4.5V to 20V<\/td>\n<\/tr>\n
Dropout Voltage<\/td>\n1.2V at 800mA<\/td>\n<\/tr>\n
Line Regulation<\/td>\n0.2% (typical)<\/td>\n<\/tr>\n
Load Regulation<\/td>\n0.2% (typical)<\/td>\n<\/tr>\n
\u9759\u6001\u7535\u6d41<\/td>\n5 mA (typical)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40 to 125 C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nDPAK-3 (TO-252-3)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 1A output current in surface-mount DPAK package<\/li>\n
  • Internal current limiting and thermal shutdown<\/li>\n
  • +\/-1% output voltage accuracy<\/li>\n
  • No minimum load requirement<\/li>\n
  • AEC-Q100 qualified for automotive use<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • 3.3V MCU and FPGA power supplies<\/li>\n
    • Post-regulation for switching converters<\/li>\n
    • Automotive ECU 3.3V rails<\/li>\n
    • Industrial control system regulation<\/li>\n
    • Battery charger regulation<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The NCP1117DT33T5G from onsemi is a 3.3V fixed-output LDO voltage regulator capable of delivering up to 1A output current. With a dropout voltage of 1.2V at 800mA and internal current limiting, it is available in a DPAK-3 surface-mount package suitable for industrial applications. Key Specifications Output Voltage 3.3V (fixed, +\/-1%) Output Current 1A […]<\/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":[144],"class_list":["post-6268","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","chip_brand-on"],"acf":{"brief_explanation":"3.3V 1A LDO, 1.2V dropout, DPAK-3, AEC-Q100, automotive grade","date_code":"","package_case":"DPAK-3 \/ TO-252-3 (6.6 x 6.0 x 2.3mm)","in_stock":6342,"datasheet":"https:\/\/www.onsemi.com\/pub\/Collateral\/NCP1117-D.PDF","price":"$0.28 @ 1ku","product_introduction":"The NCP1117DT33T5G from onsemi is a 3.3V fixed-output low-dropout linear voltage regulator from the NCP1117 series. Capable of delivering up to 1A, it features a dropout voltage of 1.2V at 800mA load and +\/-1% output voltage accuracy. The internal current limiting and thermal shutdown provide robust protection. AEC-Q100 qualified, it is suitable for automotive ECU power supplies. The DPAK-3 surface-mount package offers excellent thermal dissipation for 1A output in a compact footprint.","working_principle":"The NCP1117DT33T5G operates as a series linear voltage regulator with PNP pass transistor. **Reference Subsystem**: A trimmed bandgap reference provides the stable 3.3V output with +\/-1% accuracy over temperature and line\/load variations. **Error Amplifier**: A differential amplifier compares the output voltage against the internal reference. The error signal drives the PNP pass transistor to maintain regulation. **Pass Transistor**: The PNP pass element enables low dropout operation (1.2V at 800mA) compared to NPN-based designs. At 1A output, the device dissipates significant power (PD = (VIN-VOUT) x IOUT), requiring proper PCB thermal design. **Protection Subsystem**: Current limiting restricts output current to approximately 1.2A during overload. Thermal shutdown activates when junction temperature exceeds approximately 155C, cycling on and off until the fault is removed. **Stability**: A minimum 10uF output capacitor is required for stability. Tantalum or low-ESR ceramic capacitors ensure proper phase margin in the feedback loop.","pin_description":"
      Pin<\/th>Name<\/th>Description<\/th><\/tr>
      1<\/td>GND\/ADJ<\/td>Ground (fixed voltage version)<\/td><\/tr>
      2<\/td>VOUT<\/td>Regulated 3.3V output (connected to tab)<\/td><\/tr>
      3<\/td>VIN<\/td>Unregulated input voltage (4.5V to 20V)<\/td><\/tr>
      Tab<\/td>VOUT<\/td>Thermal tab, electrically connected to VOUT (Pin 2)<\/td><\/tr><\/table>","application_scenarios":"
      • Automotive ECU: Regulating 5V vehicle supply to 3.3V for MCU and CAN transceiver power<\/li>
      • FPGA Power: Clean 3.3V I\/O supply for Lattice and Xilinx FPGAs from 5V input<\/li>
      • Industrial Control: Post-regulation of 5V switching supply to low-noise 3.3V<\/li>
      • Battery Devices: Regulating Li-ion battery (4.2V) to 3.3V for IoT and sensor nodes<\/li>
      • Communication: 3.3V rail for Ethernet PHY and RS-485 transceiver circuits<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Key Difference<\/th><\/tr>
        LM1117DT-3.3<\/td>TI<\/td>Pin-compatible, 800mA, DPAK<\/td><\/tr>
        AMS1117-3.3<\/td>AMS<\/td>1A, 1.1V dropout, SOT-223<\/td><\/tr>
        LD1117DT33TR<\/td>ST<\/td>800mA, 1.1V dropout, DPAK<\/td><\/tr>
        NCV1117DT33T5G<\/td>onsemi<\/td>Automotive PPAP version, same specs<\/td><\/tr>
        AP1117D33LI-TRG<\/td>Diodes Inc<\/td>1A, 1.2V dropout, DPAK, low ESR stable<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6268","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=6268"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6268\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=6268"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=6268"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=6268"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=6268"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}