{"id":5430,"date":"2026-06-10T01:53:26","date_gmt":"2026-06-10T01:53:26","guid":{"rendered":"https:\/\/materialparts.com\/lm386mx-1-nopb\/"},"modified":"2026-06-10T01:53:26","modified_gmt":"2026-06-10T01:53:26","slug":"lm386mx-1-nopb","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/lm386mx-1-nopb\/","title":{"rendered":"LM386MX-1\/NOPB"},"content":{"rendered":"

\u4ea7\u54c1\u6982\u89c8<\/h2>\n

The LM386MX-1\/NOPB from Texas Instruments is a low-voltage audio power amplifier delivering 325mW into an 8-ohm speaker in an 8-pin SOIC package. With 4-12V supply range, internally set gain of 20 (adjustable to 200), and only 4mA quiescent current, it is the classic choice for battery-powered audio applications.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n
Output Power<\/td>\n325 mW into 8Ohm @ VS=12V<\/td>\n<\/tr>\n
Supply Voltage Range<\/td>\n4V to 12V (MX-1 version)<\/td>\n<\/tr>\n
Voltage Gain<\/td>\n20 (default), adjustable to 200<\/td>\n<\/tr>\n
\u9759\u6001\u7535\u6d41<\/td>\n4 mA (typical)<\/td>\n<\/tr>\n
\u8f93\u5165\u504f\u7f6e\u7535\u6d41<\/td>\n250 nA (typical)<\/td>\n<\/tr>\n
THD<\/td>\n0.2% @ AV=20, VS=6V, RL=8Ohm, PO=125mW<\/td>\n<\/tr>\n
PSRR<\/td>\n50 dB<\/td>\n<\/tr>\n
Bandwidth<\/td>\n300 kHz<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n0 to +70 C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSOIC-8<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Low-voltage audio power amplifier<\/li>\n
  • Battery operation with 4mA quiescent current<\/li>\n
  • Minimum external components<\/li>\n
  • Gain internally set to 20, adjustable to 200<\/li>\n
  • Ground-referenced input<\/li>\n

Self-centering output quiescent voltage<\/li>\n
  • Low distortion: 0.2% at 125mW output<\/li>\n
  • Wide supply range: 4V to 12V (MX-1)<\/li>\n
  • 8-pin SOIC surface-mount package<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • AM\/FM radio amplifiers<\/li>\n
    • Portable speaker systems<\/li>\n
    • Intercoms and TV sound<\/li>\n
    • Ultrasonic drivers and servo drives<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LM386MX-1\/NOPB from Texas Instruments is a low-voltage audio power amplifier delivering 325mW into an 8-ohm speaker in an 8-pin SOIC package. With 4-12V supply range, internally set gain of 20 (adjustable to 200), and only 4mA quiescent current, it is the classic choice for battery-powered audio applications. Key Specifications Output Power 325 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[19,13],"tags":[],"chip_brand":[138],"class_list":["post-5430","post","type-post","status-publish","format-standard","hentry","category-analog-linear-ics","category-integrated-circuits-ics","chip_brand-ti"],"acf":{"brief_explanation":"325mW audio amp, gain 20-200, 4-12V, 4mA Iq, SOIC-8","date_code":"","package_case":"SOIC-8 (4.9 x 3.9 x 1.5 mm)","in_stock":10208,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/lm386.pdf","price":"$0.307 @ 1ku","product_introduction":"The LM386MX-1\/NOPB from Texas Instruments is the surface-mount version of the legendary LM386 low-voltage audio power amplifier in an 8-pin SOIC package. The MX-1 version specifies 4V to 12V supply range and 325mW output into 8Ohm at 12V supply. The \/NOPB suffix indicates lead-free (Pb-free) packaging. Since its introduction by National Semiconductor in the 1970s, the LM386 has become the most widely used small audio amplifier IC, found in everything from guitar pedals to educational kits. The gain is internally set to 20 (26dB) with no external components, but can be increased to any value from 20 to 200 (46dB) by adding a resistor and capacitor between pins 1 and 8. The ground-referenced input eliminates the need for input coupling capacitors in many applications, while the self-centering output biases to VCC\/2 automatically.","working_principle":"The LM386 operates through four subsystems: (1) Differential Input Stage: A PNP differential pair provides ground-referenced inputs (both inputs referenced to ground). The input impedance is approximately 50kOhm. The negative input is typically used for feedback, while the positive input receives the audio signal. (2) Gain Setting: The default voltage gain of 20 is set by internal resistors. The gain can be increased by bypassing the internal 1.35kOhm emitter resistor between pins 1 and 8 with an external capacitor (gain increases to 200 when only the capacitor is used) or with a resistor-capacitor series combination (gain set between 20 and 200). (3) Power Output Stage: A Class AB push-pull output stage automatically biases to VCC\/2. The output can drive loads as low as 4Ohm, delivering up to 325mW at VS=12V into 8Ohm. The output is AC-coupled to the speaker through a 250uF capacitor. (4) Bypass and Zobel Network: Pin 7 provides a bypass for the internal midpoint reference. A 10uF capacitor from pin 7 to ground improves PSRR and reduces power supply noise on the output. A Zobel network (0.05uF + 10Ohm in series) from the output to ground prevents high-frequency oscillation.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>
      1<\/td>GAIN<\/td>I\/O<\/td>Gain set (bypass with C to pin 8 for gain=200)<\/td><\/tr>
      2<\/td>IN-<\/td>Input<\/td>Inverting input (ground for non-inverting config)<\/td><\/tr>
      3<\/td>IN+<\/td>Input<\/td>Non-inverting input (audio signal input)<\/td><\/tr>
      4<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>
      5<\/td>VOUT<\/td>Output<\/td>Audio output (AC-coupled to speaker)<\/td><\/tr>
      6<\/td>VCC<\/td>Power<\/td>Supply voltage (4-12V for MX-1)<\/td><\/tr>
      7<\/td>BYPASS<\/td>Analog<\/td>Bypass capacitor (10uF to GND for PSRR)<\/td><\/tr>
      8<\/td>GAIN<\/td>I\/O<\/td>Gain set (connect to pin 1 via RC for gain adjust)<\/td><\/tr><\/table>","application_scenarios":"
      • Portable speaker amplifier with 4mA quiescent current and 325mW output at 12V into 8Ohm<\/li>
      • AM\/FM radio audio output with gain=20 default and minimum external components<\/li>
      • Guitar practice amplifier with gain=200 (capacitor between pins 1-8) and 0.2% low distortion<\/li>
      • Ultrasonic driver with 300kHz bandwidth and gain adjustable from 20 to 200<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Pout<\/th>Vs<\/th>Notes<\/th><\/tr>
        LM386N-4\/NOPB<\/td>TI<\/td>1W<\/td>5-18V<\/td>Higher power, DIP-8<\/td><\/tr>
        LM4871MX<\/td>TI<\/td>3W<\/td>2-5.5V<\/td>BTL, higher power<\/td><\/tr>
        PAM8302A<\/td>Diodes Inc<\/td>2.5W<\/td>2-5.5V<\/td>Class-D, efficient<\/td><\/tr>
        TPA2016D2RTJR<\/td>TI<\/td>2.8W<\/td>2.5-5.5V<\/td>Class-D, I2C gain<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5430","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/comments?post=5430"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5430\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=5430"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=5430"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=5430"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=5430"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}