{"id":7883,"date":"2026-06-28T03:14:36","date_gmt":"2026-06-28T03:14:36","guid":{"rendered":"https:\/\/materialparts.com\/sn74ls14n\/"},"modified":"2026-06-28T11:46:45","modified_gmt":"2026-06-28T11:46:45","slug":"sn74ls14n","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/sn74ls14n\/","title":{"rendered":"SN74LS14N"},"content":{"rendered":"

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

The SN74LS14N is a hex Schmitt-trigger inverter from Texas Instruments with hysteresis inputs, high noise immunity, and slow-edge tolerance in a 14-pin PDIP package.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u901a\u9053\u6570<\/td>\n6 (hex inverter)<\/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
VT+ (Positive-going threshold)<\/td>\n1.5V min, 2.0V typical<\/td>\n<\/tr>\n
VT- (Negative-going threshold)<\/td>\n0.6V typical, 1.0V max<\/td>\n<\/tr>\n
Hysteresis (VT+ – VT-)<\/td>\n0.8V typical<\/td>\n<\/tr>\n
Output Low Current (IOL)<\/td>\n8mA<\/td>\n<\/tr>\n
Output High Current (IOH)<\/td>\n-0.4mA<\/td>\n<\/tr>\n
\u4f20\u64ad\u5ef6\u8fdf<\/td>\n15ns typical, 22ns max at 5V<\/td>\n<\/tr>\n
Supply Current<\/td>\n21mA max (all gates)<\/td>\n<\/tr>\n
\u8f93\u5165\u7c7b\u578b<\/td>\nSchmitt-trigger with hysteresis<\/td>\n<\/tr>\n
\u8f93\u51fa\u7c7b\u578b<\/td>\nPush-pull (totem pole)<\/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
  • Six independent Schmitt-trigger inverters in one package<\/li>\n
  • Different threshold voltages for rising and falling inputs<\/li>\n
  • High noise immunity due to hysteresis (~0.8V)<\/li>\n
  • Operates from very slow input edges without oscillation<\/li>\n
  • Improved line-receiving characteristics<\/li>\n
  • Input clamp diodes limit negative undershoot<\/li>\n
  • Direct replacement for 7414 and 74LS14 from any manufacturer<\/li>\n
  • Temperature compensated thresholds<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Switch debouncing and signal conditioning<\/li>\n
    • Square wave generation from sine or triangle waves<\/li>\n
    • RC oscillator circuits<\/li>\n
    • Noisy signal cleanup and level restoration<\/li>\n
    • Line receivers for long cable runs<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The SN74LS14N is a hex Schmitt-trigger inverter from Texas Instruments with hysteresis inputs, high noise immunity, and slow-edge tolerance in a 14-pin PDIP package. Key Specifications Number of Channels 6 (hex inverter) Logic Family LS (Low-power Schottky) Supply Voltage 4.75V to 5.25V (5V nominal) VT+ (Positive-going threshold) 1.5V min, 2.0V typical VT- (Negative-going […]<\/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-7883","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-ti"],"acf":{"brief_explanation":"Hex Schmitt-trigger inverter, 5V LS, 0.8V hysteresis, 22ns, PDIP-14","date_code":"","package_case":"PDIP-14 (19.3 x 6.35 x 4.57mm, 2.54mm pitch, through-hole)","in_stock":12000,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/sn74ls14.pdf","price":"$0.28 @ 1ku","product_introduction":"The SN74LS14N from Texas Instruments contains six independent Schmitt-trigger inverters in a 14-pin PDIP through-hole package. Unlike standard inverters that switch at a single threshold voltage, each Schmitt-trigger inverter has separate positive-going (VT+) and negative-going (VT-) thresholds with approximately 0.8V of hysteresis. This hysteresis provides high noise immunity and clean output switching even when the input signal has slow edges, noise, or bounce. The device converts slowly rising or falling analog signals into clean digital outputs without the oscillation that standard gates exhibit. The LS (Low-power Schottky) technology provides 15ns typical propagation delay with 8mA output sink current. Input clamp diodes protect against negative voltage undershoot. The N suffix denotes the PDIP through-hole package.","working_principle":"Each of the six inverters in the SN74LS14N uses a Schmitt-trigger circuit with positive feedback that creates two distinct switching thresholds. When the input voltage rises from below VT- toward VT+, the output remains HIGH until the input exceeds VT+ (approximately 1.7V). Once the input crosses VT+, the output switches LOW. When the input then falls from above VT+ toward VT-, the output remains LOW until the input drops below VT- (approximately 0.9V). Only then does the output switch HIGH again. The difference between VT+ and VT- is the hysteresis voltage (approximately 0.8V), which creates a dead band where noise cannot cause the output to toggle. This is fundamentally different from a standard inverter (like the 74LS04) which switches at a single threshold around 1.3V and can oscillate if the input is near that threshold with noise. The Schmitt trigger's hysteresis makes it ideal for switch debouncing: the bouncing contact creates a noisy input that oscillates between 0V and 5V, but the hysteresis ensures the output switches once and stays stable. The input clamp diode prevents the input from going below approximately -0.7V by clamping negative undershoot to ground.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>1A<\/td>Input<\/td>Gate 1 input<\/td><\/tr>\n
      2<\/td>1Y<\/td>Output<\/td>Gate 1 output<\/td><\/tr>\n
      3<\/td>2A<\/td>Input<\/td>Gate 2 input<\/td><\/tr>\n
      4<\/td>2Y<\/td>Output<\/td>Gate 2 output<\/td><\/tr>\n
      5<\/td>3A<\/td>Input<\/td>Gate 3 input<\/td><\/tr>\n
      6<\/td>3Y<\/td>Output<\/td>Gate 3 output<\/td><\/tr>\n
      7<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>\n
      8<\/td>4Y<\/td>Output<\/td>Gate 4 output<\/td><\/tr>\n
      9<\/td>4A<\/td>Input<\/td>Gate 4 input<\/td><\/tr>\n
      10<\/td>5Y<\/td>Output<\/td>Gate 5 output<\/td><\/tr>\n
      11<\/td>5A<\/td>Input<\/td>Gate 5 input<\/td><\/tr>\n
      12<\/td>6Y<\/td>Output<\/td>Gate 6 output<\/td><\/tr>\n
      13<\/td>6A<\/td>Input<\/td>Gate 6 input<\/td><\/tr>\n
      14<\/td>VCC<\/td>Power<\/td>Supply (4.75V to 5.25V)<\/td><\/tr>\n<\/table>\n

      SN74LS14N uses the PDIP-14 package with the same hex inverter pinout as 7404\/74LS04: VCC at Pin 14, GND at Pin 7. Six independent Schmitt-trigger inverters: Inv 1 (Pin 1 in, Pin 2 out), Inv 2 (Pin 3 in, Pin 4 out), Inv 3 (Pin 5 in, Pin 6 out), Inv 4 (Pin 9 in, Pin 8 out), Inv 5 (Pin 11 in, Pin 10 out), Inv 6 (Pin 13 in, Pin 12 out). The Schmitt-trigger inputs have hysteresis of approximately 0.8V (VT+ \u2248 1.7V, VT- \u2248 0.9V) at 5V supply. This makes the device ideal for cleaning up noisy signals, debouncing mechanical switches, and building RC oscillators. For wider supply range, 74HC14 operates from 2-6V with proportional hysteresis.<\/p>","application_scenarios":"

        \n
      • Switch Debouncing:<\/strong> 0.8V hysteresis eliminates contact bounce without software delays; output is clean single-edge<\/li>\n
      • Signal Squaring:<\/strong> Converts slow sine, triangle, or ramp signals into clean digital square waves without multi-transition<\/li>\n
      • RC Oscillator:<\/strong> One gate plus one resistor and one capacitor form a simple square-wave oscillator; hysteresis sets frequency<\/li>\n
      • Noise Cleanup:<\/strong> Restores degraded digital signals from long cables; hysteresis rejects noise within the dead band<\/li>\n
      • Line Receiver:<\/strong> Improved line-receiving characteristics over standard gates for noisy TTL signal reception<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Supply<\/th><\/tr>\n
        74LS14N<\/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
        74LS14D<\/td>TI\/Nexperia<\/td>Surface-mount SOIC version of LS with identical logic function<\/td>SOIC-14<\/td>5V TTL<\/td><\/tr>\n
        74HC14D<\/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
        74HC14N<\/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
        74HCT14D<\/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
        74HCT14N<\/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
        74AC14D<\/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
        74AC14N<\/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
        74LVC14D<\/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
        74LVC14N<\/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 7414 is a Hex Schmitt-Trigger Inverter. 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\/7883","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=7883"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7883\/revisions"}],"predecessor-version":[{"id":8207,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7883\/revisions\/8207"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=7883"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=7883"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=7883"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=7883"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}