{"id":7949,"date":"2026-06-28T06:01:49","date_gmt":"2026-06-28T06:01:49","guid":{"rendered":"https:\/\/materialparts.com\/lm7805ct-3\/"},"modified":"2026-06-28T11:45:25","modified_gmt":"2026-06-28T11:45:25","slug":"lm7805ct-3","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/lm7805ct-3\/","title":{"rendered":"LM7805CT"},"content":{"rendered":"

Productos<\/h2>\n

The LM7805CT from onsemi\/TI is a 3-terminal 1A positive voltage regulator providing a fixed 5V output with internal thermal shutdown and short-circuit protection in a TO-220 package \u2014 the most widely used 5V regulator in electronics.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Output Voltage<\/td>\n5V fixed (\u00b12% at 25\u00b0C for A-grade)<\/td>\n<\/tr>\n
Corriente de salida<\/td>\n1A continuous (1.5A peak)<\/td>\n<\/tr>\n
Input Voltage Range<\/td>\n7.5V to 20V (7.5V min for regulation)<\/td>\n<\/tr>\n
Maximum Input Voltage<\/td>\n35V<\/td>\n<\/tr>\n
Dropout Voltage<\/td>\n2V typical @ 1A<\/td>\n<\/tr>\n
Line Regulation<\/td>\n5mV typical (7.5V to 20V)<\/td>\n<\/tr>\n
Load Regulation<\/td>\n10mV typical (5mA to 1A)<\/td>\n<\/tr>\n
Corriente de reposo<\/td>\n5mA typical<\/td>\n<\/tr>\n
Ripple Rejection<\/td>\n68dB typical @ 120Hz<\/td>\n<\/tr>\n
Thermal Shutdown<\/td>\n~170\u00b0C junction<\/td>\n<\/tr>\n
Short-Circuit Current<\/td>\n2.1A typical<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-40\u00b0C to +125\u00b0C (junction)<\/td>\n<\/tr>\n
Paquete<\/td>\nTO-220-3 (through-hole, tab=GND)<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • Fixed 5V output \u2014 the standard logic supply voltage<\/li>\n
  • 1A continuous output current<\/li>\n
  • Internal thermal overload protection<\/li>\n
  • Internal short-circuit current limiting<\/li>\n
  • Output transistor safe operating area protection<\/li>\n
  • 68dB ripple rejection at 120Hz<\/li>\n
  • Only two external capacitors needed<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • 5V logic power supply<\/li>\n
    • Microcontroller voltage regulation<\/li>\n
    • Post-regulator after switching supply<\/li>\n
    • Bench power supply<\/li>\n
    • USB 5V power source<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LM7805CT from onsemi\/TI is a 3-terminal 1A positive voltage regulator providing a fixed 5V output with internal thermal shutdown and short-circuit protection in a TO-220 package \u2014 the most widely used 5V regulator in electronics. Key Specifications Output Voltage 5V fixed (\u00b12% at 25\u00b0C for A-grade) Output Current 1A continuous (1.5A peak) […]<\/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-7949","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-microcontrollers-processors","chip_brand-ti"],"acf":{"brief_explanation":"5V 1A positive linear regulator, TO-220, thermal\/SCP protection","date_code":"","package_case":"TO-220-3 (15.6 x 10.6 x 4.6mm, through-hole, tab=GND)","in_stock":30000,"datasheet":"https:\/\/www.onsemi.com\/pub\/Collateral\/LM78XX-D.PDF","price":"$0.48 @ 1ku","product_introduction":"The LM7805CT from onsemi\/Texas Instruments is the most ubiquitous voltage regulator in electronics, providing a fixed 5V output at up to 1A from an input of 7.5V or higher. It is the backbone of virtually every 5V logic power supply, from Arduino boards to industrial controllers. The device requires only two external capacitors (0.33\u00b5F input, 0.1\u00b5F output) for stable operation. The 2V dropout voltage means the input must be at least 7V to maintain 5V output at full load. The 68dB ripple rejection effectively attenuates AC mains ripple by a factor of 2500, making the output clean enough for sensitive analog circuits. Internal protection includes thermal shutdown (disables output at ~170\u00b0C junction), current limiting (short-circuit current limited to ~2.1A), and safe operating area compensation. The CT suffix denotes the TO-220 package. For lower dropout alternatives, the LM2940 (0.5V dropout at 1A) is preferred when input voltage is close to 5V.","working_principle":"The LM7805CT uses a series pass transistor (NPN Darlington) between the input and output, controlled by a feedback loop that compares a fraction of the output voltage with an internal bandgap reference. When the output voltage drops below 5V, the error amplifier increases the drive to the pass transistor, increasing current flow. When the output rises above 5V, the drive is reduced. The thermal protection circuit monitors the junction temperature; at ~170\u00b0C, the pass transistor is disabled until the device cools. The current limiting circuit limits the pass transistor current to approximately 2.1A during a short circuit. The safe operating area (SOA) protection further reduces the current limit as the input-output voltage differential increases. The 5mA quiescent current flows through the ground pin and biases the internal reference and error amplifier. The 0.33\u00b5F input capacitor prevents oscillation when the source impedance is high, and the 0.1\u00b5F output capacitor improves transient response.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>INPUT<\/td>Power Input<\/td>Unregulated input voltage. Must be at least 3.0V (Vout + Vdropout \u2248 3.0V) for proper regulation. Maximum 35V. Bypass with 0.33\u00b5F ceramic capacitor to GND if supply is more than 6 inches from the regulator.<\/td><\/tr>\n
      2<\/td>GND<\/td>Ground<\/td>Common ground reference. The TO-220 tab is electrically connected to this pin and serves as the primary heat dissipation path. Use thermal compound and heatsink for currents above 500mA.<\/td><\/tr>\n
      3<\/td>OUTPUT<\/td>Power Output<\/td>Regulated 0.5V DC output at up to 1A continuous current with \u00b14% tolerance. Bypass with 0.1\u00b5F ceramic capacitor to GND to improve transient response and output impedance. Do not apply external voltage higher than 0.5V to prevent reverse bias damage.<\/td><\/tr>\n<\/table>\n

      Pin assignment follows standard TO-220-3 layout: Pin 1 (left) = Input, Pin 2 (center) = Ground\/Tab, Pin 3 (right) = Output, when viewed from the front with pins pointing down. The metal tab on the back is electrically connected to Pin 2 (GND) and must be insulated from the heatsink when the heatsink is not at ground potential. Output capacitance of 0.1\u00b5F is required for stability; input capacitance of 0.33\u00b5F is recommended when the input supply is remote.<\/p>","application_scenarios":"

        \n
      • 5V MCU Supply:<\/strong> 9V battery or wall adapter \u2192 LM7805CT \u2192 5V for MCU, TTL logic, sensors; 0.33\u00b5F + 0.1\u00b5F caps<\/li>\n
      • Arduino Power:<\/strong> 12V DC jack \u2192 LM7805CT \u2192 5V rail; Pdiss = (12-5)\u00d70.5A = 3.5W; small heatsink needed<\/li>\n
      • Post-SMPS:<\/strong> 7.5V switching supply \u2192 LM7805CT \u2192 clean 5V; 68dB ripple rejection eliminates switcher noise<\/li>\n
      • USB Power:<\/strong> 9V battery \u2192 LM7805CT \u2192 5V USB output; charges phone or powers USB device<\/li>\n
      • Split Supply:<\/strong> LM7805CT (+5V) + LM7905CT (-5V) from center-tapped transformer; \u00b15V for op-amp circuits<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Specs<\/th><\/tr>\n
        LM7805ACT<\/td>onsemi<\/td>Tighter output tolerance: \u00b12% vs \u00b14% for precision power supply applications<\/td>TO-220-3<\/td>0.5V\/1A<\/td><\/tr>\n
        L7805CV<\/td>STMicroelectronics<\/td>Direct equivalent with 1.5A output current, internal thermal shutdown and current limiting<\/td>TO-220-3<\/td>0.5V\/1.5A<\/td><\/tr>\n
        MC7805CTG<\/td>onsemi<\/td>Current production replacement with identical electrical specifications and RoHS compliance<\/td>TO-220-3<\/td>0.5V\/1A<\/td><\/tr>\n
        KA7805<\/td>onsemi\/Fairchild<\/td>Budget-friendly version with \u00b14% tolerance and standard 1A output current rating<\/td>TO-220-3<\/td>0.5V\/1A<\/td><\/tr>\n
        MC7805ABD2TG<\/td>onsemi<\/td>Surface-mount DPAK version with \u00b12% A-grade tolerance for compact PCB layouts<\/td>DPAK-3<\/td>0.5V\/1A<\/td><\/tr>\n
        LM2940CT-0.5<\/td>TI<\/td>Low-dropout version with 0.5V max dropout at 1A for battery-powered and automotive systems<\/td>TO-220-3<\/td>0.5V\/1A LDO<\/td><\/tr>\n<\/table>\n

        LM7805CT is a 0.5V fixed positive voltage regulator in TO-220-3 with 1A output and \u00b14% tolerance. The ACT suffix offers \u00b12% precision. For surface-mount designs, use MC7805ABD2TG (DPAK). For battery-powered systems, the LM2940CT-0.5 LDO version reduces dropout to 0.5V. All 7805 variants are pin-compatible (IN-GND-OUT) and require only input\/output capacitors.<\/p>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/7949","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=7949"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/7949\/revisions"}],"predecessor-version":[{"id":8224,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/7949\/revisions\/8224"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=7949"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=7949"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=7949"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=7949"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}