{"id":7921,"date":"2026-06-28T04:28:48","date_gmt":"2026-06-28T04:28:48","guid":{"rendered":"https:\/\/materialparts.com\/sn74ls08n-2\/"},"modified":"2026-06-28T11:46:04","modified_gmt":"2026-06-28T11:46:04","slug":"sn74ls08n-2","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/sn74ls08n-2\/","title":{"rendered":"SN74LS08N"},"content":{"rendered":"

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

The SN74LS08N from Texas Instruments is a quad 2-input AND gate with LS TTL technology, 15ns propagation delay, and industry-standard 7408 pinout in a 14-pin PDIP package.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n
Number of Gates<\/td>\n4 (quad 2-input AND)<\/td>\n<\/tr>\n
\u903b\u8f91\u5bb6\u65cf<\/td>\nLS (Low-power Schottky)<\/td>\n<\/tr>\n
\u7535\u6e90\u7535\u538b<\/td>\n4.75V to 5.25V (5V nominal)<\/td>\n<\/tr>\n
\u4f20\u64ad\u5ef6\u8fdf<\/td>\n15ns typical @ 5V<\/td>\n<\/tr>\n
Output Drive (IOL\/IOH)<\/td>\n8mA \/ -0.4mA<\/td>\n<\/tr>\n
Input Voltage (HIGH min)<\/td>\n2V<\/td>\n<\/tr>\n
Input Voltage (LOW max)<\/td>\n0.8V<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n0\u00b0C to +70\u00b0C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nPDIP-14 (19.3 x 6.35mm)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Four independent 2-input AND gates<\/li>\n
  • LS TTL technology<\/li>\n
  • 15ns typical propagation delay<\/li>\n
  • Industry-standard 7408 pinout<\/li>\n
  • Input clamp diodes for undershoot protection<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Logic AND function implementation<\/li>\n
    • Chip select gating<\/li>\n
    • Enable signal qualification<\/li>\n
    • Address decoding logic<\/li>\n
    • General-purpose logic gating<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The SN74LS08N from Texas Instruments is a quad 2-input AND gate with LS TTL technology, 15ns propagation delay, and industry-standard 7408 pinout in a 14-pin PDIP package. Key Specifications Number of Gates 4 (quad 2-input AND) Logic Family LS (Low-power Schottky) Supply Voltage 4.75V to 5.25V (5V nominal) Propagation Delay 15ns typical @ […]<\/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-7921","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-ti"],"acf":{"brief_explanation":"Quad 2-input AND gate, LS TTL, 15ns, PDIP-14","date_code":"","package_case":"PDIP-14 (19.3 x 6.35 x 4.57mm, 2.54mm pitch, through-hole)","in_stock":8000,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/sn74ls08.pdf","price":"$0.28 @ 1ku","product_introduction":"The SN74LS08N from Texas Instruments contains four independent 2-input AND gates in a 14-pin PDIP through-hole package. Each gate performs the Boolean function Y = A AND B; the output is HIGH only when both inputs are HIGH. The LS (Low-power Schottky) technology provides 15ns typical propagation delay with moderate power consumption. The AND gate is one of the most fundamental logic elements, used for qualifying signals: an enable input ANDed with a data input passes the data through only when enabled. The device is also commonly used in address decoding, where multiple address lines must all be in the correct state to select a particular device. The N suffix denotes the PDIP-14 through-hole package.","working_principle":"Each of the four AND gates in the SN74LS08N performs the Boolean function Y = A \u00b7 B. The output Y is HIGH only when both input A and input B are HIGH. For all other input combinations (00, 01, 10), the output is LOW. The LS TTL implementation uses Schottky diodes at the input for faster switching and a totem-pole output stage. The 15ns propagation delay means the output transitions approximately 15ns after the inputs change. AND gates are fundamental building blocks for digital logic: they implement qualification (an enable must be ANDed with a signal for it to pass), validation (multiple conditions must all be true), and decoding (multiple address bits must match). In address decoding, for example, a 7408 AND gate can combine A15 and A14 (both HIGH) to create a chip select for the upper 16K of memory.","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>1Y<\/td>Output<\/td>Gate 1 output (AND)<\/td><\/tr>\n
      4<\/td>2A<\/td>Input<\/td>Gate 2 input A<\/td><\/tr>\n
      5<\/td>2B<\/td>Input<\/td>Gate 2 input B<\/td><\/tr>\n
      6<\/td>2Y<\/td>Output<\/td>Gate 2 output (AND)<\/td><\/tr>\n
      7<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>\n
      8<\/td>3Y<\/td>Output<\/td>Gate 3 output (AND)<\/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>4Y<\/td>Output<\/td>Gate 4 output (AND)<\/td><\/tr>\n
      12<\/td>4A<\/td>Input<\/td>Gate 4 input A<\/td><\/tr>\n
      13<\/td>4B<\/td>Input<\/td>Gate 4 input B<\/td><\/tr>\n
      14<\/td>VCC<\/td>Power<\/td>Supply (4.75V to 5.25V)<\/td><\/tr>\n<\/table>","application_scenarios":"
        \n
      • Chip Select Gating:<\/strong> Address line ANDed with MREQ signal; CS asserted only when both address matches AND memory cycle active<\/li>\n
      • Enable Qualification:<\/strong> Data signal ANDed with enable; data passes only when both are HIGH<\/li>\n
      • Window Detection:<\/strong> Two comparators (high limit, low limit) ANDed to indicate signal is within window<\/li>\n
      • Address Decode:<\/strong> Multiple address bits ANDed; all must be HIGH for device selection<\/li>\n
      • Strobe Generation:<\/strong> Clock ANDed with counter output to generate periodic strobe pulse<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Supply<\/th><\/tr>\n
        74LS08N<\/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
        74LS08D<\/td>TI\/Nexperia<\/td>Surface-mount SOIC version of LS with identical logic function<\/td>SOIC-14<\/td>5V TTL<\/td><\/tr>\n
        74HC08D<\/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
        74HC08N<\/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
        74HCT08D<\/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
        74HCT08N<\/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
        74AC08D<\/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
        74AC08N<\/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
        74LVC08D<\/td>TI\/Nexperia<\/td>Low-voltage CMOS for 1.65-3.6V modern logic with 24mA output drive and bus-hold inputs<\/td>SOIC-14<\/td>1.65-3.6V CMOS<\/td><\/tr>\n
        74LVC08N<\/td>TI\/Nexperia<\/td>Through-hole DIP version of LVC family for prototyping and repair<\/td>DIP-14<\/td>1.65-3.6V CMOS<\/td><\/tr>\n<\/table>\n

        The 7408 is a Quad 2-Input AND 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\/zh\/wp-json\/wp\/v2\/posts\/7921","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=7921"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7921\/revisions"}],"predecessor-version":[{"id":8192,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7921\/revisions\/8192"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=7921"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=7921"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=7921"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=7921"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}