{"id":7990,"date":"2026-06-28T06:32:21","date_gmt":"2026-06-28T06:32:21","guid":{"rendered":"https:\/\/materialparts.com\/lm3914n-2\/"},"modified":"2026-06-28T11:44:31","modified_gmt":"2026-06-28T11:44:31","slug":"lm3914n-2","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/lm3914n-2\/","title":{"rendered":"LM3914N"},"content":{"rendered":"

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

The LM3914N from Texas Instruments is a monolithic dot\/bar display driver that senses an analog voltage and drives 10 LEDs in either bar-graph or moving-dot mode \u2014 the classic VU meter and battery indicator IC in an 18-pin PDIP 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
\u0627\u0644\u0648\u0638\u064a\u0641\u0629<\/td>\nDot\/Bar display driver (10-LED analog meter)<\/td>\n<\/tr>\n
LED Channels<\/td>\n10 (independently driven)<\/td>\n<\/tr>\n
\u062c\u0647\u062f \u0627\u0644\u0625\u0645\u062f\u0627\u062f<\/td>\n3V to 20V (typical 5V-15V)<\/td>\n<\/tr>\n
Internal Reference<\/td>\n1.25V (adjustable from 1.2V to 12V)<\/td>\n<\/tr>\n
LED Current<\/td>\n2mA to 30mA (programmable via 1 resistor)<\/td>\n<\/tr>\n
\u0646\u0637\u0627\u0642 \u062c\u0647\u062f \u0627\u0644\u0625\u062f\u062e\u0627\u0644<\/td>\n0V to \u00b135V (protected)<\/td>\n<\/tr>\n
Linearity<\/td>\n0.5% typical<\/td>\n<\/tr>\n
Input Impedance<\/td>\n>10M\u03a9 (buffer input)<\/td>\n<\/tr>\n
Display Mode<\/td>\nDot or Bar (pin 9 selects)<\/td>\n<\/tr>\n
Cascading<\/td>\nUp to 100 LEDs (10 chips)<\/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-18 (23.5 x 6.35mm)<\/td>\n<\/tr>\n<\/table>\n

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    \n
  • 10 independently driven LED outputs (current-regulated, open-collector)<\/li>\n
  • Dot or Bar mode selectable via single pin<\/li>\n
  • Internal precision voltage reference (adjustable)<\/li>\n
  • Input buffer accepts signals down to ground (0V)<\/li>\n
  • No LED resistors needed \u2014 current programmable<\/li>\n
  • Cascadable for 20, 30, … 100 LED displays<\/li>\n
  • Input withstands \u00b135V without damage<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • VU meters and audio level displays<\/li>\n
    • Battery voltage indicators<\/li>\n
    • Temperature gauges<\/li>\n
    • Analog meter replacements<\/li>\n
    • Expanded-scale meters<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LM3914N from Texas Instruments is a monolithic dot\/bar display driver that senses an analog voltage and drives 10 LEDs in either bar-graph or moving-dot mode \u2014 the classic VU meter and battery indicator IC in an 18-pin PDIP package. Key Specifications Function Dot\/Bar display driver (10-LED analog meter) LED Channels 10 (independently […]<\/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-7990","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-microcontrollers-processors","chip_brand-ti"],"acf":{"brief_explanation":"10-LED dot\/bar display driver, 3-20V, programmable current, PDIP-18","date_code":"","package_case":"PDIP-18 (23.5 x 6.35 x 4.57mm, 2.54mm pitch, through-hole)","in_stock":5000,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/lm3914.pdf","price":"$2.50 @ 1ku","product_introduction":"The LM3914N from Texas Instruments is the industry-standard analog display driver that senses an analog voltage level and drives 10 LEDs to form a bar-graph or moving-dot display. A single pin (pin 9) selects the display mode: tied to V+ for bar mode (all LEDs up to the signal level light), or left open for dot mode (only one LED at the signal level lights). The internal 1.25V reference and precision 10-step resistor divider create 10 equally-spaced comparison thresholds. The LED current is set by a single external resistor connected to the reference output \u2014 no individual LED resistors needed. The reference voltage is adjustable from 1.2V to 12V using two external resistors, setting the full-scale input voltage. The input buffer has high impedance (>10M\u03a9) and accepts signals down to ground, making it compatible with single-supply systems. The LM3914 is incredibly easy to use: a basic 1.2V meter needs only 1 resistor, 10 LEDs, and a power supply. For battery indicators: connect input to battery voltage through a voltage divider; adjust reference for full-scale at the desired voltage. Multiple LM3914s can be cascaded for 20, 30, or more LED displays. The N suffix denotes the PDIP-18 package. Status: Discontinued (TI recommends checking alternatives).","working_principle":"The LM3914N operates as follows: An input buffer (high-impedance voltage follower) receives the analog signal and drives 10 comparators. Each comparator has its inverting input connected to a different tap on an internal 10-step resistor divider. The resistor divider is biased by the internal 1.25V reference (adjustable via external resistors). When the input voltage exceeds a comparator's threshold, that comparator's output activates, sinking current through the corresponding LED. In bar mode (pin 9 tied to V+), all comparators below the signal level activate, creating a bar of lit LEDs. In dot mode (pin 9 open), only the highest activated comparator drives its LED, creating a single moving dot. The LED current is proportional to the current flowing out of the reference output pin: I_LED \u2248 10 \u00d7 I_REF. By choosing the reference resistor, LED brightness is controlled without individual resistors. The internal reference develops 1.25V between REF OUT (pin 7) and REF ADJ (pin 8). Adding resistors from pin 8 to ground and pin 7 to pin 8 sets the reference voltage: V_REF = 1.25 \u00d7 (1 + R2\/R1) + 120\u00b5A \u00d7 R2. This sets the full-scale voltage. The floating resistor divider means both ends (Rhi and Rlo) are accessible, allowing expanded-scale or zero-center meter configurations.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>LED 1<\/td>Output<\/td>LED 1 driver (open collector, current regulated)<\/td><\/tr>\n
      2<\/td>V\u2212<\/td>Power<\/td>Negative supply \/ Ground<\/td><\/tr>\n
      3<\/td>V+<\/td>Power<\/td>Positive supply (3V to 20V)<\/td><\/tr>\n
      4<\/td>Rlo<\/td>Input<\/td>Lower end of resistor divider (connect to GND or offset voltage)<\/td><\/tr>\n
      5<\/td>SIG<\/td>Input<\/td>Signal input (high impedance, accepts 0V to V+)<\/td><\/tr>\n
      6<\/td>Rhi<\/td>Input<\/td>Upper end of resistor divider (connect to REF OUT for basic use)<\/td><\/tr>\n
      7<\/td>REF OUT<\/td>Output<\/td>Reference output (1.25V, adjustable)<\/td><\/tr>\n
      8<\/td>REF ADJ<\/td>Input<\/td>Reference adjust (connect resistor to GND)<\/td><\/tr>\n
      9<\/td>MODE<\/td>Input<\/td>Mode select: tied to V+ = bar, open = dot<\/td><\/tr>\n
      10<\/td>LED 10<\/td>Output<\/td>LED 10 driver (open collector)<\/td><\/tr>\n
      11<\/td>LED 9<\/td>Output<\/td>LED 9 driver<\/td><\/tr>\n
      12<\/td>LED 8<\/td>Output<\/td>LED 8 driver<\/td><\/tr>\n
      13<\/td>LED 7<\/td>Output<\/td>LED 7 driver<\/td><\/tr>\n
      14<\/td>LED 6<\/td>Output<\/td>LED 6 driver<\/td><\/tr>\n
      15<\/td>LED 5<\/td>Output<\/td>LED 5 driver<\/td><\/tr>\n
      16<\/td>LED 4<\/td>Output<\/td>LED 4 driver<\/td><\/tr>\n
      17<\/td>LED 3<\/td>Output<\/td>LED 3 driver<\/td><\/tr>\n
      18<\/td>LED 2<\/td>Output<\/td>LED 2 driver<\/td><\/tr>\n<\/table>","application_scenarios":"
        \n
      • Simple VU Meter:<\/strong> Audio signal \u2192 rectifier \u2192 SIG (pin 5); Rhi to REF OUT; Rlo to GND; 10 LEDs on pins 1,18-10; MODE pin 9 to V+ (bar) or open (dot); 1 resistor sets LED current<\/li>\n
      • Battery Indicator:<\/strong> Battery voltage \u2192 voltage divider \u2192 SIG; REF set for full-scale at charged voltage; LEDs: green=charged, yellow=mid, red=low<\/li>\n
      • 20-LED Display:<\/strong> Two LM3914s; SIG of #2 = SIG of #1 (shifted by resistor divider); pin 9 of #1 \u2192 pin 1 of #2 for dot carry; bar mode for bar display<\/li>\n
      • Expanded-Scale Meter:<\/strong> Rhi and Rlo set to a narrow voltage window (e.g., 11V-13V for 12V battery); 10 LEDs span only 2V range for high resolution<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Specs<\/th><\/tr>\n
        LM3915N<\/td>TI<\/td>Logarithmic version with 3dB\/step for audio VU metering and signal strength displays<\/td>DIP-18<\/td>3V-25V\/log<\/td><\/tr>\n
        LM3916N<\/td>TI<\/td>Semi-logarithmic version designed specifically for standard VU scale audio metering<\/td>DIP-18<\/td>3V-25V\/VU<\/td><\/tr>\n
        LM3914V<\/td>TI<\/td>Same device in 20-pin PLCC surface-mount package for compact PCB assembly<\/td>PLCC-20<\/td>3V-25V\/linear<\/td><\/tr>\n
        MAX7219<\/td>ADI<\/td>SPI-controlled 8-digit LED display driver with individual segment dimming for multiplexed displays<\/td>DIP-24<\/td>2.7-5.5V\/SPI<\/td><\/tr>\n
        HT16K33<\/td>Holtek<\/td>I2C LED matrix driver with 16x8 multiplex for 7-segment and dot-matrix displays<\/td>DIP-28<\/td>4.5-5.5V\/I2C<\/td><\/tr>\n<\/table>\n

        LM3914N is a linear-scale dot\/bar display driver that drives 10 LEDs proportional to an analog input voltage. LM3915 (logarithmic 3dB\/step) and LM3916 (VU scale) are audio-optimized variants. All share the same DIP-18 pinout and support both dot and bar display modes. For digital control, MAX7219 and HT16K33 provide SPI\/I2C LED driver alternatives with individual LED addressing.<\/p>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7990","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=7990"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7990\/revisions"}],"predecessor-version":[{"id":8213,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7990\/revisions\/8213"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=7990"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=7990"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=7990"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=7990"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}