{"id":7910,"date":"2026-06-28T04:21:23","date_gmt":"2026-06-28T04:21:23","guid":{"rendered":"https:\/\/materialparts.com\/lm1117mp-3-3\/"},"modified":"2026-06-28T11:46:14","modified_gmt":"2026-06-28T11:46:14","slug":"lm1117mp-3-3","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/lm1117mp-3-3\/","title":{"rendered":"LM1117MP-3.3"},"content":{"rendered":"

Productos<\/h2>\n

The LM1117MP-3.3 is an 800mA low-dropout positive linear regulator from Texas Instruments with fixed 3.3V output, 1.2V dropout at full load, and \u00b11% output accuracy in a SOT-223 surface-mount package.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Output Voltage<\/td>\n3.3V fixed (\u00b11% accuracy)<\/td>\n<\/tr>\n
Corriente de salida<\/td>\n800mA max<\/td>\n<\/tr>\n
Input Voltage Range<\/td>\n4.5V to 15V<\/td>\n<\/tr>\n
Dropout Voltage<\/td>\n1.2V max @ 800mA load<\/td>\n<\/tr>\n
Line Regulation<\/td>\n0.2% max<\/td>\n<\/tr>\n
Load Regulation<\/td>\n0.4% max<\/td>\n<\/tr>\n
Corriente de reposo<\/td>\n5mA typical<\/td>\n<\/tr>\n
PSRR<\/td>\n75dB @ 120Hz<\/td>\n<\/tr>\n
Output Capacitor<\/td>\n10\u00b5F minimum (tantalum or low-ESR ceramic)<\/td>\n<\/tr>\n
Protection<\/td>\nOver-current and thermal shutdown<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n0\u00b0C to +125\u00b0C<\/td>\n<\/tr>\n
Paquete<\/td>\nSOT-223 (6.5 x 3.5mm, surface mount)<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • Fixed 3.3V output with \u00b11% accuracy<\/li>\n
  • 800mA output current<\/li>\n
  • 1.2V dropout at full load<\/li>\n
  • 75dB ripple rejection at 120Hz<\/li>\n
  • Over-current and thermal shutdown protection<\/li>\n
  • Zener-trimmed bandgap reference for precision<\/li>\n
  • Compatible with LM317 pinout (SOT-223 version)<\/li>\n
  • Space-saving SOT-223 package with thermal tab<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • 5V to 3.3V logic level conversion<\/li>\n
    • Post-regulator for switching power supplies<\/li>\n
    • SCSI-2 active termination (2.85V version)<\/li>\n
    • Battery-powered instrumentation<\/li>\n
    • Embedded system 3.3V power rails<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LM1117MP-3.3 is an 800mA low-dropout positive linear regulator from Texas Instruments with fixed 3.3V output, 1.2V dropout at full load, and \u00b11% output accuracy in a SOT-223 surface-mount package. Key Specifications Output Voltage 3.3V fixed (\u00b11% accuracy) Output Current 800mA max Input Voltage Range 4.5V to 15V Dropout Voltage 1.2V max @ […]<\/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":[13,24],"tags":[],"chip_brand":[138],"class_list":["post-7910","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-microcontrollers-processors","chip_brand-ti"],"acf":{"brief_explanation":"800mA LDO, 3.3V fixed, 1.2V Vdo, \u00b11% accuracy, SOT-223","date_code":"","package_case":"SOT-223 (TO-261-4, 6.5 x 3.5 x 1.8mm, surface mount with thermal tab)","in_stock":25768,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/lm1117.pdf","price":"$0.54 @ 1ku","product_introduction":"The LM1117MP-3.3 from Texas Instruments is an 800mA low-dropout positive linear regulator providing a fixed 3.3V output with \u00b11% initial accuracy. The device uses a PNP pass transistor to achieve 1.2V maximum dropout voltage at 800mA load, enabling regulation from a 5V supply with 0.5V headroom. The 75dB ripple rejection at 120Hz makes it effective as a post-regulator following a switching supply, cleaning up residual switching ripple. Over-current protection limits the output current to prevent damage during fault conditions, and thermal shutdown disables the output if the junction temperature exceeds approximately 165\u00b0C. The SOT-223 package features a large thermal tab (connected to VOUT) that provides a low thermal resistance path to the PCB copper, enabling effective heat dissipation. The MP suffix denotes the SOT-223 package with tape-and-reel packaging. The -3.3 suffix specifies the 3.3V fixed output voltage.","working_principle":"The LM1117MP-3.3 uses a PNP pass transistor between VIN and VOUT, controlled by an error amplifier that compares the output voltage against a zener-trimmed bandgap reference. When VOUT drops below 3.3V, the error amplifier drives the PNP base harder, increasing collector current (output current) flowing to the load. When VOUT rises above 3.3V, the error amplifier reduces base drive, limiting output current. The PNP pass transistor is key to the LDO operation: unlike NPN regulators where VOUT = VIN - VBE - VCESAT (minimum dropout \u2248 1.5V), the PNP configuration allows VOUT to approach VIN much more closely, limited only by VCE(sat) of the PNP. At 800mA, the worst-case dropout is 1.2V, meaning VIN must be at least 4.5V to maintain regulation. The 5mA quiescent current is the PNP base drive current that flows to ground rather than to the load; this increases with load current because higher load requires more base drive. The output capacitor (minimum 10\u00b5F) provides frequency compensation for the feedback loop; without it, the regulator may oscillate. The capacitor's ESR must be between 0.3\u03a9 and 22\u03a9 for stability\u2014modern low-ESR ceramics may require a small series resistor to maintain stability.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>GND\/ADJ<\/td>Ground<\/td>Ground (fixed version) or Adjust (adj. version)<\/td><\/tr>\n
      2<\/td>VOUT<\/td>Output<\/td>Regulated 3.3V output (tab also VOUT)<\/td><\/tr>\n
      3<\/td>VIN<\/td>Input<\/td>Input supply (4.5V to 15V)<\/td><\/tr>\n
      4<\/td>TAB<\/td>Output<\/td>Thermal tab (connected to VOUT, for heat dissipation)<\/td><\/tr>\n<\/table>\n

      LM1117MP-3.3 uses the SOT-223-4 (MP) surface-mount package with Pin 1 = GND\/Adjust, Pin 2 = VOUT (tab), Pin 3 = VIN, Pin 4 = Tab (connected to VOUT). The tab underneath the package must be soldered to a PCB copper pour for both electrical connection to VOUT and thermal dissipation. The MP package designation indicates SOT-223 from TI\/National. Output current up to 800mA with 1.1V dropout at full load. A minimum 10\u00b5F tantalum output capacitor is required for stability. For fixed 3.3V output, the ADJ pin (Pin 1) is internally connected to a resistive divider \u2014 do not connect external components to Pin 1 on the fixed-voltage version.<\/p>","application_scenarios":"

        \n
      • 5V to 3.3V:<\/strong> VIN=5V, VOUT=3.3V, 1.7V headroom; at 500mA load, Pdiss = (5-3.3)\u00d70.5 = 850mW \u2014 needs PCB copper heat area<\/li>\n
      • Post-SMPS:<\/strong> 75dB PSRR attenuates 100mV switcher ripple to 18\u00b5V; adds clean analog-grade 3.3V<\/li>\n
      • 3.3V MCU Rail:<\/strong> 800mA supports MCU + peripherals; thermal tab solders to copper pour for heat dissipation<\/li>\n
      • Battery to Logic:<\/strong> 4.2V Li-ion to 3.3V; 0.9V dropout works until battery discharges to ~4.5V<\/li>\n
      • Multi-Rail System:<\/strong> LM1117-3.3 + LM1117-5.0 from 12V bus; thermal management critical at high VI-VO<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Specs<\/th><\/tr>\n
        TLV1117LV33DCYR<\/td>TI<\/td>Modern 1A LDO with 300mV dropout and 500\u00b5A IQ, stable with ceramic capacitors only<\/td>SOT-223-3<\/td>3.3V\/1A\/300mV<\/td><\/tr>\n
        AMS1117-3.3<\/td>Advanced<\/td>Budget equivalent with 1.1V dropout at 1A, widely available and very low cost<\/td>SOT-223-3<\/td>3.3V\/1A\/1.1V<\/td><\/tr>\n
        MCP1826T-3302E\/DC<\/td>Microchip<\/td>1A anyCAP LDO with 210mV dropout, stable with any capacitor type and value<\/td>SOT-223-3<\/td>3.3V\/1A\/210mV<\/td><\/tr>\n
        LD1117DT33CTR<\/td>ST<\/td>800mA LDO with 1V dropout in DPAK for surface-mount 3.3V supply rails<\/td>DPAK-3<\/td>3.3V\/800mA<\/td><\/tr>\n
        AZ1117IH-3.3TRG1<\/td>Diodes Inc<\/td>1A LDO with 1.1V dropout, ESD protection, and pin-compatible with AMS1117-3.3<\/td>SOT-223-3<\/td>3.3V\/1A\/1.1V<\/td><\/tr>\n<\/table>\n

        LM1117MP-3.3 is an 800mA low-dropout regulator in SOT-223-4 with 1.1V dropout at 800mA and 3.3V fixed output. The TLV1117LV33DCYR is the modern TI replacement with lower 300mV dropout and ceramic capacitor stability. The AMS1117-3.3 is the most popular budget alternative with identical SOT-223-3 pinout. For anyCAP stability, MCP1826T guarantees stability with any capacitor type.<\/p>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/7910","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=7910"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/7910\/revisions"}],"predecessor-version":[{"id":8243,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/7910\/revisions\/8243"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=7910"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=7910"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=7910"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=7910"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}