{"id":7852,"date":"2026-06-28T02:53:05","date_gmt":"2026-06-28T02:53:05","guid":{"rendered":"https:\/\/materialparts.com\/lm7805ct-2\/"},"modified":"2026-06-28T10:20:13","modified_gmt":"2026-06-28T10:20:13","slug":"lm7805ct-2","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/lm7805ct-2\/","title":{"rendered":"LM7805CT"},"content":{"rendered":"

\u0646\u0638\u0631\u0629 \u0639\u0627\u0645\u0629 \u0639\u0644\u0649 \u0627\u0644\u0645\u0646\u062a\u062c<\/h2>\n

The LM7805CT is a 1A positive voltage regulator from onsemi\/TI providing a fixed 5V output with 2V typical dropout, thermal overload protection, and short-circuit current limiting in a TO-220 package.<\/p>\n

\u0627\u0644\u0645\u0648\u0627\u0635\u0641\u0627\u062a \u0627\u0644\u0631\u0626\u064a\u0633\u064a\u0629<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u062c\u0647\u062f \u0627\u0644\u062e\u0631\u062c<\/td>\n5V fixed (\u00b12% at 25\u00b0C)<\/td>\n<\/tr>\n
\u062a\u064a\u0627\u0631 \u0627\u0644\u0625\u062e\u0631\u0627\u062c<\/td>\n1A (with adequate heatsinking)<\/td>\n<\/tr>\n
\u0646\u0637\u0627\u0642 \u062c\u0647\u062f \u0627\u0644\u0625\u062f\u062e\u0627\u0644<\/td>\n7V to 35V<\/td>\n<\/tr>\n
\u062c\u0647\u062f \u0627\u0644\u062a\u0633\u0631\u0628<\/td>\n2V typical at 1A<\/td>\n<\/tr>\n
Line Regulation<\/td>\n0.01%\/V typical<\/td>\n<\/tr>\n
Load Regulation<\/td>\n10mV typical (5mA to 1.5A)<\/td>\n<\/tr>\n
\u062a\u064a\u0627\u0631 \u0627\u0644\u062a\u0647\u062f\u0626\u0629<\/td>\n4.2mA typical<\/td>\n<\/tr>\n
Ripple Rejection<\/td>\n80dB typical at 120Hz<\/td>\n<\/tr>\n
\u0636\u0648\u0636\u0627\u0621 \u0627\u0644\u0625\u062e\u0631\u0627\u062c<\/td>\n40\u00b5Vrms typical<\/td>\n<\/tr>\n
Thermal Shutdown<\/td>\n150\u00b0C typical<\/td>\n<\/tr>\n
Short Circuit Current<\/td>\n750mA typical (current limited)<\/td>\n<\/tr>\n
\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n0\u00b0C to +125\u00b0C<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\nTO-220 (3-pin, through-hole)<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • Fixed 5V output with \u00b12% tolerance at 25\u00b0C<\/li>\n
  • 1A output current with proper heatsinking<\/li>\n
  • Internal thermal overload protection<\/li>\n
  • Internal short-circuit current limiting<\/li>\n
  • Output transistor safe area compensation<\/li>\n
  • 80dB ripple rejection at 120Hz<\/li>\n
  • No external components required for basic operation<\/li>\n
  • Industry-standard 7805 pinout<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • 5V logic power supplies<\/li>\n
    • Microcontroller and digital circuit power<\/li>\n
    • Post-regulation for switching supplies<\/li>\n
    • Bench and laboratory power supplies<\/li>\n
    • Automotive and battery chargers<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LM7805CT is a 1A positive voltage regulator from onsemi\/TI providing a fixed 5V output with 2V typical dropout, thermal overload protection, and short-circuit current limiting in a TO-220 package. Key Specifications Output Voltage 5V fixed (\u00b12% at 25\u00b0C) Output Current 1A (with adequate heatsinking) Input Voltage Range 7V to 35V Dropout Voltage […]<\/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":[13,32],"tags":[],"chip_brand":[138],"class_list":["post-7852","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","chip_brand-ti"],"acf":{"brief_explanation":"1A fixed 5V positive regulator, 7-35V input, TO-220, thermal protection","date_code":"","package_case":"TO-220 (10.67 x 9.04 x 4.57mm, 3-pin through-hole)","in_stock":18500,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/lm7800.pdf","price":"$0.55 @ 1ku","product_introduction":"The LM7805CT is the industry-standard 5V positive voltage regulator, one of the most widely used linear regulators in electronics. It provides a fixed 5V output at up to 1A with only two external bypass capacitors required. The internal thermal shutdown at 150\u00b0C protects against overheating, while the short-circuit current limiting at 750mA typical prevents damage from output faults. The 80dB ripple rejection at 120Hz makes it effective for post-regulating rectified AC or switching converter outputs. The TO-220 package allows heatsinking for higher power dissipation. With over 40 years in production, the LM7805 remains the go-to solution for simple 5V power supplies.","working_principle":"The LM7805CT uses a series pass transistor (NPN Darlington) controlled by an error amplifier that compares a fraction of the output voltage with an internal bandgap reference. The error amplifier drives the base of the pass transistor to maintain the output at 5V. The series pass element dissipates power equal to (VIN - VOUT) \u00d7 ILOAD as heat, requiring a heatsink for high differential voltages or load currents. The thermal shutdown circuit monitors the junction temperature and turns off the pass transistor when it exceeds approximately 150\u00b0C, preventing damage. The current-limiting circuit senses the output current through a small series resistor and reduces the drive to the pass transistor when the current exceeds approximately 750mA. Safe area protection reduces the current limit as the input-output voltage differential increases, keeping the pass transistor within its safe operating area (SOA). The 80dB ripple rejection is achieved by the high gain of the error amplifier, which suppresses input ripple at 120Hz by a factor of 10,000. The quiescent current of 4.2mA flows through the internal bias network and is delivered to the load rather than wasted.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>INPUT<\/td>Power<\/td>Unregulated input voltage (7V-35V)<\/td><\/tr>\n
      2<\/td>GND<\/td>Power<\/td>Ground (common, tab)<\/td><\/tr>\n
      3<\/td>OUTPUT<\/td>Power<\/td>Regulated 5V output<\/td><\/tr>\n<\/table>","application_scenarios":"
        \n
      • 5V Logic Power:<\/strong> Fixed 5V output directly powers TTL, CMOS, and MCU circuits from 9V or 12V sources<\/li>\n
      • Post-Regulation:<\/strong> 80dB ripple rejection cleans switching converter output for noise-sensitive analog circuits<\/li>\n
      • Bench Supplies:<\/strong> TO-220 with heatsink provides reliable 5V at 1A for prototyping and test fixtures<\/li>\n
      • Automotive:<\/strong> 7-35V input range tolerates automotive battery voltage for 5V accessory power<\/li>\n
      • Educational:<\/strong> Simplest possible regulator circuit (2 capacitors + LM7805) teaches linear regulation fundamentals<\/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\/ar\/wp-json\/wp\/v2\/posts\/7852","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/comments?post=7852"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7852\/revisions"}],"predecessor-version":[{"id":8286,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7852\/revisions\/8286"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=7852"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=7852"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=7852"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=7852"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}