{"id":7605,"date":"2026-06-26T06:52:27","date_gmt":"2026-06-26T06:52:27","guid":{"rendered":"https:\/\/materialparts.com\/74hct14d\/"},"modified":"2026-06-26T14:53:01","modified_gmt":"2026-06-26T14:53:01","slug":"74hct14d","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/74hct14d\/","title":{"rendered":"74HCT14D"},"content":{"rendered":"

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

The 74HCT14D from Nexperia is a hex inverting Schmitt trigger in SO14 package, providing six independent inverters with TTL-compatible input levels and hysteresis for noise immunity.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
  • Compliant with JEDEC standards JESD7A and JESD8C<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Wave and pulse shaping<\/li>\n
    • Astable and monostable multivibrators<\/li>\n
    • Signal conditioning and debouncing<\/li>\n
    • Clock and data signal cleanup<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The 74HCT14D from Nexperia is a hex inverting Schmitt trigger in SO14 package, providing six independent inverters with TTL-compatible input levels and hysteresis for noise immunity. Key Specifications Logic Family 74HCT (TTL input levels) Number of Gates 6 inverters Supply Voltage 4.5 to 5.5V Propagation Delay 18ns typical Output Drive +-4mA Input Hysteresis […]<\/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":[13,25],"tags":[],"chip_brand":[140],"class_list":["post-7605","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-microcontrollers-mcu","chip_brand-nexperia"],"acf":{"brief_explanation":"Hex inverting Schmitt trigger, TTL input, 4.5-5.5V, SO14, 18ns propagation","date_code":"","package_case":"SO14 (SOT108-1, 8.65 x 3.9 x 1.75 mm)","in_stock":3679,"datasheet":"https:\/\/assets.nexperia.com\/documents\/data-sheet\/74HC_HCT14.pdf","price":"$0.22 @ 1ku","product_introduction":"

      The 74HCT14D from Nexperia is a hex inverting Schmitt trigger integrated circuit in an SO14 surface-mount package. It contains six independent inverters, each featuring Schmitt trigger inputs with hysteresis that transform slowly changing input signals into sharply defined, jitter-free output signals. The HCT variant features reduced input threshold levels compatible with TTL logic levels, allowing direct interfacing with TTL outputs while maintaining CMOS output drive levels. The Schmitt trigger action provides a hysteresis window of approximately 0.6V, giving excellent noise immunity and allowing the device to handle slowly rising or falling input signals without oscillation. The device operates from a single 4.5V to 5.5V supply and offers a propagation delay of approximately 18ns. Each output can drive up to +-4mA. ESD protection exceeds 2000V HBM and latch-up immunity exceeds 100mA per JESD78.<\/p>","working_principle":"

      The 74HCT14D operates through six independent inverting Schmitt trigger channels: (1) Input stage with hysteresis - Each Schmitt trigger input has two distinct threshold voltages: a higher positive-going threshold (VT+) and a lower negative-going threshold (VT-). The difference between VT+ and VT- is the hysteresis voltage (approximately 0.6V typical). When the input voltage rises past VT+, the output switches low (inverted). When the input falls below VT-, the output switches high. This dual-threshold mechanism ensures that small noise fluctuations within the hysteresis window do not cause output toggling. (2) TTL-compatible thresholds - The HCT variant has its VT+ and VT- thresholds set to match TTL logic levels (approximately 1.4V and 0.8V), enabling direct connection to TTL outputs that may not swing rail-to-rail. (3) CMOS output stage - The output stage uses a complementary CMOS push-pull configuration, providing rail-to-rail output swing with +-4mA drive capability. The CMOS construction ensures very low static power consumption. (4) Protection - Input clamp diodes allow interfacing to voltages exceeding VCC when used with current-limiting resistors. ESD protection circuits and latch-up resistant design ensure robust operation.<\/p>","pin_description":"

    • \u903b\u8f91\u5bb6\u65cf<\/td>\n74HCT (TTL input levels)<\/td>\n<\/tr>\n
    Number of Gates<\/td>\n6 inverters<\/td>\n<\/tr>\n
    \u7535\u6e90\u7535\u538b<\/td>\n4.5 to 5.5V<\/td>\n<\/tr>\n
    \u4f20\u64ad\u5ef6\u8fdf<\/td>\n18ns typical<\/td>\n<\/tr>\n
    Output Drive<\/td>\n+-4mA<\/td>\n<\/tr>\n
    Input Hysteresis<\/td>\n0.6V typical<\/td>\n<\/tr>\n
    Max Frequency<\/td>\n36 MHz<\/td>\n<\/tr>\n
    \u5305\u88c5<\/td>\nSO14 (SOT108-1)<\/td>\n<\/tr>\n
    \u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40 to +125 C<\/td>\n<\/tr>\n<\/table>\n

    \u7279\u70b9<\/h2>\n
      \n
    • TTL-compatible input switching levels<\/li>\n
    • Schmitt trigger hysteresis for noise immunity<\/li>\n
    • Unlimited input rise and fall times<\/li>\n
    • CMOS low power dissipation<\/li>\n
    • ESD protection exceeds 2000V HBM<\/td>\n<\/tr>\n

    Latch-up performance exceeds 100mA per JESD78<\/td>\n<\/tr>\n
    Pin<\/th>Name<\/th>Function<\/th><\/tr>
    1<\/td>1A<\/td>Input of inverter 1<\/td><\/tr>
    2<\/td>1Y<\/td>Output of inverter 1<\/td><\/tr>
    3<\/td>2A<\/td>Input of inverter 2<\/td><\/tr>
    4<\/td>2Y<\/td>Output of inverter 2<\/td><\/tr>
    5<\/td>3A<\/td>Input of inverter 3<\/td><\/tr>
    6<\/td>3Y<\/td>Output of inverter 3<\/td><\/tr>
    7<\/td>GND<\/td>Ground (0V)<\/td><\/tr>
    8<\/td>4Y<\/td>Output of inverter 4<\/td><\/tr>
    9<\/td>4A<\/td>Input of inverter 4<\/td><\/tr>
    10<\/td>5Y<\/td>Output of inverter 5<\/td><\/tr>
    11<\/td>5A<\/td>Input of inverter 5<\/td><\/tr>
    12<\/td>6Y<\/td>Output of inverter 6<\/td><\/tr>
    13<\/td>6A<\/td>Input of inverter 6<\/td><\/tr>
    14<\/td>VCC<\/td>Supply voltage (4.5-5.5V)<\/td><\/tr><\/table>","application_scenarios":"
    • Wave and pulse shaping circuits converting slowly varying analog signals into clean digital outputs with hysteresis noise immunity<\/li>
    • Astable and monostable multivibrator circuits using Schmitt trigger hysteresis for precise timing<\/li>
    • Switch debouncing and signal conditioning for mechanical contacts with unlimited input rise\/fall time tolerance<\/li>
    • Clock and data signal cleanup in mixed TTL\/CMOS systems leveraging TTL-compatible input thresholds<\/li><\/ul>","alternative_models":"
      Model<\/th>Manufacturer<\/th>Key Difference<\/th><\/tr>
      74HC14D<\/td>Nexperia<\/td>CMOS input levels, same function<\/td><\/tr>
      SN74HCT14N<\/td>TI<\/td>DIP-14 package, same function<\/td><\/tr>
      74AHC14D<\/td>Nexperia<\/td>Faster propagation, overvoltage tolerant<\/td><\/tr>
      MC74HCT14ADR2G<\/td>onsemi<\/td>SOIC-14, equivalent<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7605","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=7605"}],"version-history":[{"count":2,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7605\/revisions"}],"predecessor-version":[{"id":7768,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7605\/revisions\/7768"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=7605"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=7605"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=7605"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=7605"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}