{"id":6614,"date":"2026-06-18T15:38:37","date_gmt":"2026-06-18T15:38:37","guid":{"rendered":"https:\/\/materialparts.com\/lm386n-3\/"},"modified":"2026-06-18T15:38:37","modified_gmt":"2026-06-18T15:38:37","slug":"lm386n-3","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/lm386n-3\/","title":{"rendered":"LM386N-3"},"content":{"rendered":"

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

The LM386N-3 from Texas Instruments is a low-voltage audio power amplifier delivering 500mW into 8 Ohm from a single 9V supply. Requiring minimal external components and with a fixed gain of 20 (adjustable to 200), it is the most popular audio amplifier IC for hobbyist and small speaker projects. Packaged in 8-PDIP.<\/p>\n

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Output Power<\/td>\n500mW (8 Ohm, 9V supply)<\/td>\n<\/tr>\n
\u062c\u0647\u062f \u0627\u0644\u0625\u0645\u062f\u0627\u062f<\/td>\n4V to 12V<\/td>\n<\/tr>\n
Voltage Gain<\/td>\n20 (26dB) default, adjustable to 200 (46dB)<\/td>\n<\/tr>\n
\u062a\u064a\u0627\u0631 \u0627\u0644\u062a\u0647\u062f\u0626\u0629<\/td>\n4mA (typ)<\/td>\n<\/tr>\n
Input Impedance<\/td>\n50kOhm<\/td>\n<\/tr>\n
THD<\/td>\n0.2% (typ at 125mW)<\/td>\n<\/tr>\n
Bandwidth<\/td>\n300kHz<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\n8-PDIP<\/td>\n<\/tr>\n
\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n0 to +70 C<\/td>\n<\/tr>\n<\/table>\n

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    \n
  • Single supply operation: 4V to 12V<\/li>\n
  • Only 4mA quiescent current<\/li>\n
  • Default gain of 20, adjustable to 200 with external capacitor<\/li>\n
  • Self-centering output (VCC\/2 bias)<\/li>\n
  • Minimal external components required<\/li>\n
  • Ground-referenced input<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • Small speaker amplifiers<\/li>\n
    • Intercom and walkie-talkie audio<\/li>\n
    • AM\/FM radio audio output<\/li>\n
    • Ultrasonic drivers<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LM386N-3 from Texas Instruments is a low-voltage audio power amplifier delivering 500mW into 8 Ohm from a single 9V supply. Requiring minimal external components and with a fixed gain of 20 (adjustable to 200), it is the most popular audio amplifier IC for hobbyist and small speaker projects. Packaged in 8-PDIP. Key […]<\/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":[36,13],"tags":[],"chip_brand":[138],"class_list":["post-6614","post","type-post","status-publish","format-standard","hentry","category-gate-driver-ics","category-integrated-circuits-ics","chip_brand-ti"],"acf":{"brief_explanation":"Low-voltage 500mW audio amp, 4-12V, gain 20-200, 8-PDIP","date_code":"","package_case":"8-PDIP","in_stock":7671,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/lm386.pdf","price":"$0.45 @ 1ku","product_introduction":"The LM386N-3 from Texas Instruments is a low-voltage audio power amplifier designed for battery-powered applications. It delivers 500mW into an 8 Ohm speaker from a single 9V supply with only 4mA quiescent current, making it ideal for portable audio devices. The default voltage gain of 20 (26dB) requires no external components; adding a capacitor between pins 1 and 8 increases the gain to 200 (46dB). The output is self-centering at VCC\/2, eliminating the need for a coupling capacitor in some configurations. With only a handful of external components, a complete audio amplifier can be built in minutes. The LM386 has been the go-to audio amplifier IC for decades, used in everything from guitar practice amps to toy electronics.","working_principle":"The LM386 uses a class AB output stage with a differential input pair. The input stage is ground-referenced, accepting signals directly without DC blocking capacitors in many configurations. The internal feedback network sets the default gain to 20; connecting a capacitor (10uF typical) between pins 1 and 8 bypasses the internal 1.35kOhm resistor, increasing gain to 200. The output stage is biased to VCC\/2 by an internal voltage divider, allowing single-supply operation with the output coupling capacitor blocking the DC offset from the speaker. The 300kHz bandwidth provides ample margin for audio applications. The low quiescent current of 4mA makes battery operation practical. The class AB output stage delivers reasonable efficiency while maintaining low crossover distortion.","pin_description":"
      Pin<\/th>Name<\/th>Function<\/th><\/tr>
      1<\/td>GAIN<\/td>Gain adjust (cap to pin 8 for 200x gain)<\/td><\/tr>
      2<\/td>IN-<\/td>Inverting input (usually grounded)<\/td><\/tr>
      3<\/td>IN+<\/td>Non-inverting input (audio signal)<\/td><\/tr>
      4<\/td>GND<\/td>Ground<\/td><\/tr>
      5<\/td>VOUT<\/td>Audio output (via coupling capacitor to speaker)<\/td><\/tr>
      6<\/td>VCC<\/td>Power supply (4-12V)<\/td><\/tr>
      7<\/td>BYPASS<\/td>Bypass capacitor (to ground, for ripple rejection)<\/td><\/tr>
      8<\/td>GAIN<\/td>Gain adjust (cap to pin 1 for 200x gain)<\/td><\/tr><\/table>","application_scenarios":"
      • Portable speaker amplifier from 9V battery with 500mW output<\/li>
      • AM\/FM radio audio output stage with 4mA quiescent current<\/li>
      • Guitar practice amplifier with gain adjustable from 20 to 200<\/li>
      • Intercom and walkie-talkie audio driver with minimal external components<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Key Difference<\/th><\/tr>
        LM386N-1<\/td>TI<\/td>325mW output, 4-12V<\/td><\/tr>
        LM386N-4<\/td>TI<\/td>1W output, 5-18V, higher power<\/td><\/tr>
        LM4906<\/td>TI<\/td>Bridge-tied-load, no output capacitor<\/td><\/tr>
        PAM8302A<\/td>Diodes Inc<\/td>Class-D, 2.5W, much more efficient<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/6614","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=6614"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/6614\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=6614"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=6614"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=6614"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=6614"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}