{"id":7943,"date":"2026-06-28T06:01:43","date_gmt":"2026-06-28T06:01:43","guid":{"rendered":"https:\/\/materialparts.com\/lm386n-3-2\/"},"modified":"2026-06-28T11:45:32","modified_gmt":"2026-06-28T11:45:32","slug":"lm386n-3-2","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/lm386n-3-2\/","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 700mW into 8\u03a9 from a 9V supply, with internally-set gain of 20 (adjustable to 200), 4mA quiescent current, and only a few external components required in a PDIP-8 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\n
Architecture<\/td>\nClass-AB<\/td>\n<\/tr>\n
\u0627\u0644\u0642\u0646\u0648\u0627\u062a<\/td>\n1 (Mono)<\/td>\n<\/tr>\n
\u062c\u0647\u062f \u0627\u0644\u0625\u0645\u062f\u0627\u062f<\/td>\n4V to 12V (N-3 version)<\/td>\n<\/tr>\n
Output Power<\/td>\n700mW typical @ 9V, 8\u03a9<\/td>\n<\/tr>\n
Voltage Gain<\/td>\n20 (26dB) default; adjustable 20-200 via pins 1-8<\/td>\n<\/tr>\n
\u062a\u064a\u0627\u0631 \u0627\u0644\u062a\u0647\u062f\u0626\u0629<\/td>\n4mA typical<\/td>\n<\/tr>\n
Input Impedance<\/td>\n50k\u03a9<\/td>\n<\/tr>\n
\u062a\u064a\u0627\u0631 \u062a\u062d\u064a\u0632 \u0627\u0644\u0625\u062f\u062e\u0627\u0644<\/td>\n250nA typical<\/td>\n<\/tr>\n
THD+N<\/td>\n0.2% @ AV=20, 6V, 8\u03a9, 125mW<\/td>\n<\/tr>\n
Output Bias<\/td>\nAuto-centering to VCC\/2<\/td>\n<\/tr>\n
Bandwidth<\/td>\n300kHz @ AV=20; 100kHz @ AV=200<\/td>\n<\/tr>\n
Maximum Output Swing<\/td>\nVCC\u22121.5V peak-to-peak typical<\/td>\n<\/tr>\n
\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n0\u00b0C to +70\u00b0C<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\nPDIP-8 (9.81 x 6.35mm)<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • Battery operation with low quiescent current: 4mA<\/li>\n
  • Minimal external components (as few as 2)<\/li>\n
  • Wide supply range: 4V to 12V<\/li>\n
  • Gain adjustable from 20 to 200<\/li>\n
  • Ground-referenced inputs<\/li>\n
  • Self-centering output quiescent voltage<\/li>\n
  • Low distortion: 0.2% at 125mW<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • Battery-powered audio amplifier<\/li>\n
    • Small speaker driver<\/li>\n
    • AM\/FM radio amplifier<\/li>\n
    • Intercom and talk-back<\/li>\n
    • Mini guitar amplifier<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LM386N-3 from Texas Instruments is a low-voltage audio power amplifier delivering 700mW into 8\u03a9 from a 9V supply, with internally-set gain of 20 (adjustable to 200), 4mA quiescent current, and only a few external components required in a PDIP-8 package. Key Specifications Architecture Class-AB Channels 1 (Mono) Supply Voltage 4V to 12V […]<\/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":[23,13],"tags":[],"chip_brand":[138],"class_list":["post-7943","post","type-post","status-publish","format-standard","hentry","category-data-conversion-ics-adc-dac","category-integrated-circuits-ics","chip_brand-ti"],"acf":{"brief_explanation":"700mW mono audio amp, Class-AB, gain 20-200, 4-12V, PDIP-8","date_code":"","package_case":"PDIP-8 (9.81 x 6.35 x 5.08mm, 2.54mm pitch, through-hole)","in_stock":15000,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/lm386.pdf","price":"$0.391 @ 1ku","product_introduction":"The LM386N-3 from Texas Instruments is a low-voltage audio power amplifier designed for battery-powered consumer applications. The N-3 variant delivers up to 700mW into an 8\u03a9 speaker from a 9V supply, making it suitable for small portable speakers, radios, and DIY audio projects. The internal gain is set to 20 (26dB) by default, requiring no external components for basic operation. Adding a capacitor between pins 1 and 8 bypasses the internal 1.35k\u03a9 resistor, increasing the gain to 200 (46dB); a series resistor sets any gain between 20 and 200. The inputs are ground-referenced through internal 50k\u03a9 resistors, eliminating the need for external DC biasing. The output automatically biases to half the supply voltage, enabling single-supply operation with an output coupling capacitor. The 4mA quiescent current at 6V means the amplifier draws only 24mW at idle \u2014 ideal for battery operation. The LM386 has been in continuous production since the 1970s and remains one of the most popular audio amplifier ICs for hobbyists.","working_principle":"The LM386 uses a Lin topology: a PNP differential input stage, a common-emitter voltage amplifier stage, and a Class-AB complementary push-pull output stage. The two 50k\u03a9 resistors from each input to ground provide ground-referenced biasing \u2014 the inputs sit at approximately 12.5mV above ground due to 250nA input bias current. The gain is set by the feedback network between pins 1 and 8: internally, a 1.35k\u03a9 resistor and a 150\u03a9 resistor form the emitter degeneration of the differential pair, setting the gain to 1 + (15k\u03a9\/1.5k\u03a9) = 20. Bypassing the 1.35k\u03a9 resistor with a capacitor (pin 1 to pin 8) reduces the degeneration to just 150\u03a9, increasing the gain to 1 + (15k\u03a9\/150\u03a9) = 200. A series resistor can set intermediate gains. The output stage is a complementary push-pull pair biased into Class-AB through a VBE multiplier, automatically centering the output at VCC\/2. The 250\u00b5F output coupling capacitor blocks this DC bias from the speaker while passing the AC audio signal. The capacitor forms a high-pass filter with the speaker impedance: fC = 1\/(2\u03c0\u00d7250\u00b5F\u00d78\u03a9) \u2248 80Hz. The bypass pin (7) connects to an internal 50k\u03a9\/10\u00b5F node; adding an external 10\u00b5F capacitor from pin 7 to ground improves power supply rejection by bypassing the internal node.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>GAIN<\/td>Input<\/td>Gain adjust (capacitor\/resistor to pin 8)<\/td><\/tr>\n
      2<\/td>IN\u2212<\/td>Input<\/td>Inverting input (usually AC-coupled or grounded)<\/td><\/tr>\n
      3<\/td>IN+<\/td>Input<\/td>Non-inverting input (signal input)<\/td><\/tr>\n
      4<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>\n
      5<\/td>OUT<\/td>Output<\/td>Audio output (via coupling capacitor to speaker)<\/td><\/tr>\n
      6<\/td>VCC<\/td>Power<\/td>Supply voltage (4V to 12V)<\/td><\/tr>\n
      7<\/td>BYPASS<\/td>Input<\/td>Bypass capacitor (10\u00b5F to GND for PSRR)<\/td><\/tr>\n
      8<\/td>GAIN<\/td>Input<\/td>Gain adjust (capacitor\/resistor to pin 1)<\/td><\/tr>\n<\/table>\n

      LM386N-3 uses the PDIP-8 package with audio power amplifier pinout: Pin 1 = Gain Set (bypass with 10\u00b5F to Pin 8 for 200x gain), Pin 2 = Inverting Input (-), Pin 3 = Non-inverting Input (+), Pin 4 = GND, Pin 5 = Output (to speaker via 250\u00b5F coupling cap), Pin 6 = VCC (4-12V for N-3), Pin 7 = Bypass (decouple with 10\u00b5F to GND for power supply ripple rejection), Pin 8 = Gain Set. Default gain is 20x (26dB) with pins 1 and 8 open. Adding a 10\u00b5F cap between pins 1 and 8 increases gain to 200x (46dB). A series resistor (1.2k\u03a9) with the 10\u00b5F cap sets intermediate gains. The Zobel network (0.05\u00b5F + 10\u03a9 from Pin 5 to GND) prevents oscillation with inductive speaker loads.<\/p>","application_scenarios":"

        \n
      • Basic Amp (Gain=20):<\/strong> Signal \u2192 10k\u03a9 pot \u2192 0.05\u00b5F cap \u2192 pin 3; pin 2 grounded; 250\u00b5F cap from pin 5 to 8\u03a9 speaker; 10\u00b5F cap pin 7 to GND<\/li>\n
      • High Gain (200):<\/strong> Same as above plus 10\u00b5F cap between pins 1 and 8; amplifies microphone-level signals directly<\/li>\n
      • Gain=50:<\/strong> 1.2k\u03a9 resistor + 10\u00b5F cap in series between pins 1 and 8; intermediate gain for line-level signals<\/li>\n
      • Mini Guitar Amp:<\/strong> Guitar \u2192 0.05\u00b5F \u2192 pin 3; gain=200; pin 5 \u2192 250\u00b5F \u2192 8\u03a9 speaker; 9V battery power<\/li>\n
      • Bass Boost:<\/strong> RC network (0.033\u00b5F + 10k\u03a9) from pin 1 to pin 5 boosts low frequencies; enhances bass response<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Specs<\/th><\/tr>\n
        LM386N-1<\/td>TI<\/td>Lower-power 250mW version with 4-12V supply for headphone and small speaker applications<\/td>DIP-8<\/td>250mW\/4-12V<\/td><\/tr>\n
        LM386N-4<\/td>TI<\/td>Higher-power 1W version with 5-18V supply range for louder speaker output capability<\/td>DIP-8<\/td>1W\/5-18V<\/td><\/tr>\n
        TDA7052A<\/td>NXP<\/td>1W mono audio amp with DC volume control in DIP-8 for simple audio output stages<\/td>DIP-8<\/td>1W\/DC vol<\/td><\/tr>\n
        PAM8302A<\/td>Diodes Inc<\/td>Class-D 2.5W audio amplifier with 90% efficiency in SOT-23-6 for portable speakers<\/td>SOT-23-6<\/td>2.5W\/Class-D<\/td><\/tr>\n
        TDA2030A<\/td>ST<\/td>18W mono Class-AB audio power amplifier for higher-power speaker driver applications<\/td>PENTAWATT-5<\/td>18W\/\u00b118V<\/td><\/tr>\n<\/table>\n

        LM386N-3 is a 325mW low-voltage audio power amplifier in DIP-8 with 4-12V supply and adjustable gain from 20 to 200. The N-1 (250mW) and N-4 (1W) variants scale output power. For modern battery-powered designs, the PAM8302A Class-D amplifier offers 2.5W with 90% efficiency. For higher power, TDA2030A provides up to 18W in a 5-pin TO-220 package.<\/p>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7943","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=7943"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7943\/revisions"}],"predecessor-version":[{"id":8229,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7943\/revisions\/8229"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=7943"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=7943"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=7943"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=7943"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}