{"id":7970,"date":"2026-06-28T06:17:39","date_gmt":"2026-06-28T06:17:39","guid":{"rendered":"https:\/\/materialparts.com\/sn74ls27n\/"},"modified":"2026-06-28T11:45:02","modified_gmt":"2026-06-28T11:45:02","slug":"sn74ls27n","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/sn74ls27n\/","title":{"rendered":"SN74LS27N"},"content":{"rendered":"

Productos<\/h2>\n

The SN74LS27N from Texas Instruments contains three independent 3-input positive NOR gates in a 14-pin PDIP package \u2014 ideal for multi-input OR logic with active-LOW output.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n
Number of Gates<\/td>\n3 (triple 3-input NOR)<\/td>\n<\/tr>\n
Logic Family<\/td>\nLS (Low-power Schottky)<\/td>\n<\/tr>\n
Tensi\u00f3n de alimentaci\u00f3n<\/td>\n4.75V to 5.25V<\/td>\n<\/tr>\n
Retardo de propagaci\u00f3n<\/td>\n12ns typical @ 5V<\/td>\n<\/tr>\n
Output Drive (IOL\/IOH)<\/td>\n8mA \/ -0.4mA<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n0\u00b0C to +70\u00b0C<\/td>\n<\/tr>\n
Paquete<\/td>\nPDIP-14 (19.3 x 6.35mm)<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • Triple 3-input NOR gates<\/li>\n
  • LS TTL technology<\/li>\n
  • 12ns typical propagation delay<\/li>\n
  • Three gates in one 14-pin package<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • 3-input OR function (NOR + inverter)<\/li>\n
    • Active-LOW detection (any input HIGH \u2192 output LOW)<\/li>\n
    • Multi-condition alarm<\/li>\n
    • General-purpose logic<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The SN74LS27N from Texas Instruments contains three independent 3-input positive NOR gates in a 14-pin PDIP package \u2014 ideal for multi-input OR logic with active-LOW output. Key Specifications Number of Gates 3 (triple 3-input NOR) Logic Family LS (Low-power Schottky) Supply Voltage 4.75V to 5.25V Propagation Delay 12ns typical @ 5V Output Drive […]<\/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-7970","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-ti"],"acf":{"brief_explanation":"Triple 3-input NOR gate, LS TTL, 12ns, PDIP-14","date_code":"","package_case":"PDIP-14 (19.3 x 6.35 x 4.57mm, 2.54mm pitch, through-hole)","in_stock":4000,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/sn74ls27.pdf","price":"$0.25 @ 1ku","product_introduction":"The SN74LS27N from Texas Instruments contains three independent 3-input NOR gates in a 14-pin PDIP package. Each gate performs Y = NOT(A OR B OR C); the output is HIGH only when ALL three inputs are LOW. The NOR gate is the complement of the OR gate, and by DeMorgan's theorem, NOR is also equivalent to NOT-A AND NOT-B AND NOT-C. The 7427 is useful for detecting when none of three conditions is active (all LOW \u2192 output HIGH), or for implementing 3-input OR logic by adding an inverter. The three gates in one package provide more logic density than using three 2-input NOR gates (7402) to implement 3-input functions. The N suffix denotes the PDIP-14 through-hole package.","working_principle":"Each 3-input NOR gate in the SN74LS27N performs Y = (A + B + C)' \u2014 the output is HIGH only when all three inputs are LOW simultaneously. If ANY input is HIGH, the output goes LOW. Truth table: 8 possible input combinations, only one (000) produces HIGH output. By DeMorgan's theorem: (A + B + C)' = A' \u00b7 B' \u00b7 C' \u2014 the NOR output is HIGH when A is LOW AND B is LOW AND C is LOW. For a 3-input OR function: Y = A + B + C \u2014 add an inverter after the NOR, or use the NOR with DeMorgan's equivalent. For active-HIGH alarm detection: connect three fault signals to the NOR inputs; when any fault goes HIGH, the NOR output goes LOW (active-LOW alarm). For active-HIGH alarm: add inverter. Three 3-input NOR gates can implement moderately complex combinational logic in a single 14-pin IC.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>1A<\/td>Input<\/td>Gate 1 input A<\/td><\/tr>\n
      2<\/td>1B<\/td>Input<\/td>Gate 1 input B<\/td><\/tr>\n
      3<\/td>2A<\/td>Input<\/td>Gate 2 input A<\/td><\/tr>\n
      4<\/td>2B<\/td>Input<\/td>Gate 2 input B<\/td><\/tr>\n
      5<\/td>2C<\/td>Input<\/td>Gate 2 input C<\/td><\/tr>\n
      6<\/td>2Y<\/td>Output<\/td>Gate 2 output (NOR)<\/td><\/tr>\n
      7<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>\n
      8<\/td>3Y<\/td>Output<\/td>Gate 3 output (NOR)<\/td><\/tr>\n
      9<\/td>3A<\/td>Input<\/td>Gate 3 input A<\/td><\/tr>\n
      10<\/td>3B<\/td>Input<\/td>Gate 3 input B<\/td><\/tr>\n
      11<\/td>3C<\/td>Input<\/td>Gate 3 input C<\/td><\/tr>\n
      12<\/td>1C<\/td>Input<\/td>Gate 1 input C<\/td><\/tr>\n
      13<\/td>1Y<\/td>Output<\/td>Gate 1 output (NOR)<\/td><\/tr>\n
      14<\/td>VCC<\/td>Power<\/td>Supply (5V)<\/td><\/tr>\n<\/table>","application_scenarios":"
        \n
      • 3-Input OR:<\/strong> 3 signals \u2192 7427 NOR \u2192 7404 inverter \u2192 active-HIGH OR output<\/li>\n
      • All-Clear Detect:<\/strong> 3 status signals \u2192 NOR; output HIGH only when all 3 are LOW (all-clear)<\/li>\n
      • Active-LOW Alarm:<\/strong> Overtemp, Overvoltage, Overcurrent \u2192 NOR; output LOW when any fault is HIGH<\/li>\n
      • Sum-of-Products:<\/strong> Combine NOR gates with inverters to implement product-of-sums logic forms<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Supply<\/th><\/tr>\n
        74LS27N<\/td>TI\/Nexperia<\/td>Original TTL version with 5V-only supply, typical propagation delay 10-15ns<\/td>DIP-14<\/td>5V TTL<\/td><\/tr>\n
        74LS27D<\/td>TI\/Nexperia<\/td>Surface-mount SOIC version of LS with identical logic function<\/td>SOIC-14<\/td>5V TTL<\/td><\/tr>\n
        74HC27D<\/td>TI\/Nexperia<\/td>CMOS version with wide 2-6V supply range, lower power consumption and higher noise immunity<\/td>SOIC-14<\/td>2-6V CMOS<\/td><\/tr>\n
        74HC27N<\/td>TI\/Nexperia<\/td>Through-hole DIP version of HC family for prototyping and repair<\/td>DIP-14<\/td>2-6V CMOS<\/td><\/tr>\n
        74HCT27D<\/td>TI\/Nexperia<\/td>CMOS with TTL-compatible input levels, ideal for mixing with LS devices at 5V<\/td>SOIC-14<\/td>4.5-5.5V TTL-in<\/td><\/tr>\n
        74HCT27N<\/td>TI\/Nexperia<\/td>Through-hole DIP version of HCT family for prototyping and repair<\/td>DIP-14<\/td>4.5-5.5V TTL-in<\/td><\/tr>\n
        74AC27D<\/td>TI\/Nexperia<\/td>Advanced CMOS with 2-6V supply and higher output drive current (24mA vs 6mA for HC)<\/td>SOIC-14<\/td>2-6V CMOS<\/td><\/tr>\n
        74AC27N<\/td>TI\/Nexperia<\/td>Through-hole DIP version of AC family for prototyping and repair<\/td>DIP-14<\/td>2-6V CMOS<\/td><\/tr>\n<\/table>\n

        The 7427 is a Triple 3-Input NOR Gate. 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\/es\/wp-json\/wp\/v2\/posts\/7970","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/comments?post=7970"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/7970\/revisions"}],"predecessor-version":[{"id":8164,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/7970\/revisions\/8164"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=7970"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=7970"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=7970"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=7970"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}