{"id":7962,"date":"2026-06-28T06:10:26","date_gmt":"2026-06-28T06:10:26","guid":{"rendered":"https:\/\/materialparts.com\/sn74ls47n-2\/"},"modified":"2026-06-28T11:45:12","modified_gmt":"2026-06-28T11:45:12","slug":"sn74ls47n-2","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/sn74ls47n-2\/","title":{"rendered":"SN74LS47N"},"content":{"rendered":"

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

The SN74LS47N from Texas Instruments is a BCD-to-7-segment decoder\/driver with active-LOW outputs for common-anode LED displays, featuring ripple blanking for leading-zero suppression in a 16-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
\u0627\u0644\u0648\u0638\u064a\u0641\u0629<\/td>\nBCD-to-7-segment decoder\/driver<\/td>\n<\/tr>\n
\u0639\u0627\u0626\u0644\u0629 \u0627\u0644\u0645\u0646\u0637\u0642<\/td>\nLS (Low-power Schottky)<\/td>\n<\/tr>\n
\u062c\u0647\u062f \u0627\u0644\u0625\u0645\u062f\u0627\u062f<\/td>\n4.75V to 5.25V<\/td>\n<\/tr>\n
\u0646\u0648\u0639 \u0627\u0644\u0625\u062e\u0631\u0627\u062c<\/td>\nActive-LOW (for common-anode displays)<\/td>\n<\/tr>\n
Output Sink Current<\/td>\n24mA per segment<\/td>\n<\/tr>\n
Lamp Test (LT)<\/td>\nActive LOW (all segments on)<\/td>\n<\/tr>\n
RBI\/RBO<\/td>\nRipple blanking in\/out for leading-zero suppression<\/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-16 (19.3 x 6.35mm)<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • Drives common-anode 7-segment LED displays<\/li>\n
  • 24mA output sink current per segment<\/li>\n
  • Ripple blanking for leading-zero suppression<\/li>\n
  • Lamp test for display verification<\/li>\n
  • Invalid BCD (10-15) displays unique patterns<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • Common-anode LED display driver<\/li>\n
    • Digital panel meter display<\/li>\n
    • Counter display system<\/li>\n
    • Clock and timer displays<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The SN74LS47N from Texas Instruments is a BCD-to-7-segment decoder\/driver with active-LOW outputs for common-anode LED displays, featuring ripple blanking for leading-zero suppression in a 16-pin PDIP package. Key Specifications Function BCD-to-7-segment decoder\/driver Logic Family LS (Low-power Schottky) Supply Voltage 4.75V to 5.25V Output Type Active-LOW (for common-anode displays) Output Sink Current 24mA per […]<\/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":[13,20],"tags":[],"chip_brand":[138],"class_list":["post-7962","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-ti"],"acf":{"brief_explanation":"BCD-to-7-segment decoder, active-LOW, common-anode, PDIP-16","date_code":"","package_case":"PDIP-16 (19.3 x 6.35 x 4.57mm, 2.54mm pitch, through-hole)","in_stock":4000,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/sn74ls47.pdf","price":"$0.55 @ 1ku","product_introduction":"The SN74LS47N from Texas Instruments is a BCD-to-7-segment decoder\/driver with active-LOW (current-sinking) outputs designed to drive common-anode LED displays. In a common-anode display, the anodes of all LED segments connect to VCC, and each segment turns on when its cathode is pulled LOW. The 7447's active-LOW outputs sink current through the segment, lighting it up. External current-limiting resistors (typically 330\u03a9 at 5V) are required on each segment output. The 24mA sink capability provides adequate brightness for most indoor LED displays. The Ripple Blanking Input (RBI) and Output (RBO) allow automatic leading-zero suppression: when RBI is LOW and the BCD input is 0000, all segments are blanked AND RBO goes LOW, which can drive the RBI of the next lower digit. This causes leading zeros to be blanked automatically (005 displays as ' 5'). The N suffix denotes the PDIP-16 through-hole package.","working_principle":"The SN74LS47N accepts a 4-bit BCD input (D,C,B,A) and decodes it into 7 active-LOW segment outputs (a-g). For BCD inputs 0-9, the segment outputs activate the appropriate pattern on a common-anode display. For inputs 10-15 (invalid BCD), unique patterns are displayed (not blank \u2014 the 7446\/7447 displays patterns for 10-15, unlike the CD4511 which blanks them). The Lamp Test (LT, active LOW) overrides all other inputs and turns all segments on simultaneously \u2014 useful for verifying display integrity. The Blanking Input (BI, active LOW) forces all segments off \u2014 this can be used for display blanking or intensity modulation (PWM on BI). The Ripple Blanking Input (RBI) is used for leading-zero suppression: when RBI=LOW, LT=HIGH, and BCD input=0000, all segments are blanked AND RBO goes LOW. For a 3-digit display: connect the hundreds RBI to GND; hundreds RBO to tens RBI; tens RBO to units RBI. This blanks leading zeros: 007 displays as ' 7', 070 displays as '70', 700 displays as '700'. Note: the units digit should never be blanked, so connect its RBI to VCC or leave it unconnected with a pull-up.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>B<\/td>Input<\/td>BCD input B (2^1)<\/td><\/tr>\n
      2<\/td>C<\/td>Input<\/td>BCD input C (2^2)<\/td><\/tr>\n
      3<\/td>LT<\/td>Input<\/td>Lamp test (active LOW, all segments on)<\/td><\/tr>\n
      4<\/td>BI\/RBO<\/td>I\/O<\/td>Blanking input \/ Ripple blanking output<\/td><\/tr>\n
      5<\/td>RBI<\/td>Input<\/td>Ripple blanking input (active LOW)<\/td><\/tr>\n
      6<\/td>D<\/td>Input<\/td>BCD input D (MSB)<\/td><\/tr>\n
      7<\/td>A<\/td>Input<\/td>BCD input A (LSB)<\/td><\/tr>\n
      8<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>\n
      9<\/td>e<\/td>Output<\/td>Segment e (active LOW)<\/td><\/tr>\n
      10<\/td>d<\/td>Output<\/td>Segment d (active LOW)<\/td><\/tr>\n
      11<\/td>c<\/td>Output<\/td>Segment c (active LOW)<\/td><\/tr>\n
      12<\/td>b<\/td>Output<\/td>Segment b (active LOW)<\/td><\/tr>\n
      13<\/td>a<\/td>Output<\/td>Segment a (active LOW)<\/td><\/tr>\n
      14<\/td>g<\/td>Output<\/td>Segment g (active LOW)<\/td><\/tr>\n
      15<\/td>f<\/td>Output<\/td>Segment f (active LOW)<\/td><\/tr>\n
      16<\/td>VCC<\/td>Power<\/td>Supply (5V)<\/td><\/tr>\n<\/table>","application_scenarios":"
        \n
      • 4-Digit Display:<\/strong> 4\u00d7 7447; each driven by counter BCD output; 330\u03a9 resistors on segment outputs; common-anode displays; RBI\/RBO for leading zero blanking<\/li>\n
      • Digital Clock:<\/strong> Hours and minutes from counter chain \u2192 BCD \u2192 7447 \u2192 common-anode display; RBI suppresses leading zero in hours<\/li>\n
      • Panel Meter:<\/strong> ADC BCD output \u2192 7447 \u2192 display; LT pin for display test; BI for blanking during update<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Supply<\/th><\/tr>\n
        74LS47N<\/td>TI\/Nexperia<\/td>Original TTL version with 5V-only supply, typical propagation delay 10-15ns<\/td>DIP-16<\/td>5V TTL<\/td><\/tr>\n
        74LS47D<\/td>TI\/Nexperia<\/td>Surface-mount SOIC version of LS with identical logic function<\/td>SOIC-16<\/td>5V TTL<\/td><\/tr>\n
        74HC47D<\/td>TI\/Nexperia<\/td>CMOS version with wide 2-6V supply range, lower power consumption and higher noise immunity<\/td>SOIC-16<\/td>2-6V CMOS<\/td><\/tr>\n
        74HC47N<\/td>TI\/Nexperia<\/td>Through-hole DIP version of HC family for prototyping and repair<\/td>DIP-16<\/td>2-6V CMOS<\/td><\/tr>\n
        74HCT47D<\/td>TI\/Nexperia<\/td>CMOS with TTL-compatible input levels, ideal for mixing with LS devices at 5V<\/td>SOIC-16<\/td>4.5-5.5V TTL-in<\/td><\/tr>\n
        74HCT47N<\/td>TI\/Nexperia<\/td>Through-hole DIP version of HCT family for prototyping and repair<\/td>DIP-16<\/td>4.5-5.5V TTL-in<\/td><\/tr>\n<\/table>\n

        The 7447 is a BCD-to-7-Segment Decoder\/Driver. Family variants span from the original LS TTL (5V only) to modern LVC\/AUP (down to 0.8V). HC and HCT versions offer 2-6V CMOS operation with HCT providing TTL-compatible input thresholds for mixed 5V systems. CD4000-series equivalents offer the widest 3-18V supply range at the cost of lower switching speed. DIP packages (N suffix) are through-hole; SOIC (D suffix) and TSSOP are surface-mount.<\/p>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7962","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=7962"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7962\/revisions"}],"predecessor-version":[{"id":8170,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7962\/revisions\/8170"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=7962"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=7962"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=7962"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=7962"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}