{"id":3669,"date":"2026-06-07T13:32:36","date_gmt":"2026-06-07T13:32:36","guid":{"rendered":"https:\/\/materialparts.com\/74hc245d\/"},"modified":"2026-06-07T13:32:36","modified_gmt":"2026-06-07T13:32:36","slug":"74hc245d","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/74hc245d\/","title":{"rendered":"74HC245D"},"content":{"rendered":"

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

The 74HC245D from Nexperia (formerly NXP\/Philips) is an octal bus transceiver with 3-state outputs in a 20-pin SOIC package. With 2V to 6V supply range, 7ns propagation delay at 5V, and bidirectional data flow controlled by DIR and OE inputs, it is the industry-standard bus interface for microprocessor and digital systems.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n
Logic Type<\/td>\nOctal Bus Transceiver, 3-State<\/td>\n<\/tr>\n
\u6e20\u9053<\/td>\n8 (bidirectional)<\/td>\n<\/tr>\n
\u7535\u6e90\u7535\u538b<\/td>\n2.0V to 6.0V<\/td>\n<\/tr>\n
\u4f20\u64ad\u5ef6\u8fdf<\/td>\n7 ns (typ @ 5V)<\/td>\n<\/tr>\n
Output Drive<\/td>\n+\/-6 mA @ 4.5V<\/td>\n<\/tr>\n
\u8f93\u51fa\u7c7b\u578b<\/td>\n3-State (non-inverting)<\/td>\n<\/tr>\n
ESD Protection<\/td>\nHBM >2000V, CDM >1000V<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40 to +125 C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSOIC-20 (7.5mm width)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 8-bit bidirectional bus transceiver<\/li>\n
  • Non-inverting 3-state outputs<\/li>\n
  • Output Enable (OE) and Direction (DIR) control<\/li>\n
  • 2V to 6V wide supply voltage range<\/li>\n
  • 7ns propagation delay at 5V<\/li>\n
  • CMOS low power dissipation<\/li>\n
  • High noise immunity<\/li>\n
  • Input clamp diodes for overvoltage protection<\/td>\n<\/tr>\n
  • ESD protection: HBM >2000V<\/li>\n
  • Pin compatible with 74HCT245 (TTL input levels)<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Microprocessor bus interface buffering<\/li>\n
    • Memory bank switching<\/li>\n
    • Level translation between logic domains<\/li>\n
    • Board-to-board communication isolation<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The 74HC245D from Nexperia (formerly NXP\/Philips) is an octal bus transceiver with 3-state outputs in a 20-pin SOIC package. With 2V to 6V supply range, 7ns propagation delay at 5V, and bidirectional data flow controlled by DIR and OE inputs, it is the industry-standard bus interface for microprocessor and digital systems. Key Specifications […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,20],"tags":[],"chip_brand":[140],"class_list":["post-3669","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-nexperia"],"acf":{"brief_explanation":"Octal bus transceiver, 3-state, 2-6V, 7ns, SOIC-20, bidirectional","date_code":"","package_case":"SOIC-20 (12.8 x 7.5 x 2.65 mm)","in_stock":34820,"datasheet":"https:\/\/www.nexperia.com\/products\/logic\/bus-drivers-and-transceivers\/74HC245D.html","price":"$0.35 @ 1ku","product_introduction":"The 74HC245D from Nexperia is an octal bus transceiver with 3-state non-inverting outputs in a 20-pin SOIC package. The D suffix denotes the SOIC-20 package with 7.5mm body width. As the industry-standard 8-bit bus transceiver, it provides bidirectional data transfer between two buses using a Direction (DIR) pin for flow control and an Output Enable (OE) pin for bus isolation. With 2V to 6V supply range and 7ns propagation delay at 5V, it serves as a universal bus buffer in microprocessor systems, memory interfaces, and board-to-board communication links. The 3-state outputs allow multiple devices to share a common bus without contention. The 74HCT245D variant provides TTL-compatible input thresholds.","working_principle":"The 74HC245D operates through three subsystems: (1) Bidirectional Data Path: Eight identical non-inverting data channels connect the A bus (A0-A7) to the B bus (B0-B7). Each channel can carry data in either direction, but only one direction at a time. (2) Direction Control: The DIR pin determines data flow direction. When DIR is HIGH, data flows from A to B (A inputs, B outputs). When DIR is LOW, data flows from B to A (B inputs, A outputs). This allows a single control line to manage bidirectional bus communication. (3) Bus Isolation: The active-low OE (Output Enable) pin controls the 3-state outputs. When OE is LOW, the outputs are enabled according to the DIR setting. When OE is HIGH, all outputs are forced to a high-impedance state, effectively disconnecting the device from both buses. This allows multiple 74HC245 devices to share the same bus through time-division multiplexing. Input clamp diodes on all inputs allow interfacing to voltages exceeding VCC when current-limiting resistors are used.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>
      1<\/td>DIR<\/td>Input<\/td>Direction control (HIGH=A-to-B, LOW=B-to-A)<\/td><\/tr>
      2-9<\/td>A0-A7<\/td>I\/O<\/td>Bus A data lines<\/td><\/tr>
      10<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>
      11-18<\/td>B7-B0<\/td>I\/O<\/td>Bus B data lines (reversed pin order)<\/td><\/tr>
      19<\/td>OE<\/td>Input<\/td>Output enable (active LOW)<\/td><\/tr>
      20<\/td>VCC<\/td>Power<\/td>Supply voltage (2-6V)<\/td><\/tr><\/table>","application_scenarios":"
      • Microprocessor 8-bit data bus buffering with OE control for bus isolation during DMA cycles<\/li>
      • Memory bank switching with DIR pin selecting read\/write direction and OE enabling specific banks<\/li>
      • Board-to-board communication with 3-state outputs allowing multiple boards on a shared bus<\/li>
      • Level translation between 3.3V and 5V logic domains using input clamp diodes with series resistors<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Input Level<\/th>Package<\/th>Notes<\/th><\/tr>
        74HCT245D<\/td>Nexperia<\/td>TTL<\/td>SOIC-20<\/td>TTL-compatible inputs<\/td><\/tr>
        74LVC245APW<\/td>Nexperia<\/td>CMOS<\/td>TSSOP-20<\/td>3.3V, smaller package<\/td><\/tr>
        SN74HC245DW<\/td>TI<\/td>CMOS<\/td>SOIC-20<\/td>Pin-compatible alternative<\/td><\/tr>
        MC74HC245DWG<\/td>onsemi<\/td>CMOS<\/td>SOIC-20<\/td>Pin-compatible alternative<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/3669","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=3669"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/3669\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=3669"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=3669"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=3669"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=3669"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}