{"id":7881,"date":"2026-06-28T03:14:32","date_gmt":"2026-06-28T03:14:32","guid":{"rendered":"https:\/\/materialparts.com\/74lvc245apw\/"},"modified":"2026-06-28T11:46:46","modified_gmt":"2026-06-28T11:46:46","slug":"74lvc245apw","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/74lvc245apw\/","title":{"rendered":"74LVC245APW"},"content":{"rendered":"

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

The 74LVC245APW is an octal bus transceiver from Nexperia with 3-state outputs, 5V tolerant I\/O, direction control, and 24mA drive in a TSSOP-20 package.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Number of Bits<\/td>\n8<\/td>\n<\/tr>\n
Supply Voltage (VCC)<\/td>\n1.2V to 3.6V<\/td>\n<\/tr>\n
Input Voltage Tolerance<\/td>\nUp to 5.5V (overvoltage tolerant)<\/td>\n<\/tr>\n
Output Drive<\/td>\n\u00b124mA<\/td>\n<\/tr>\n
\u4f20\u64ad\u5ef6\u8fdf<\/td>\n17ns max (at 3.3V)<\/td>\n<\/tr>\n
Max Frequency<\/td>\n175MHz<\/td>\n<\/tr>\n
\u8f93\u51fa\u7c7b\u578b<\/td>\n3-state (high-impedance when disabled)<\/td>\n<\/tr>\n
Direction Control<\/td>\nDIR pin (A\u2192B or B\u2192A)<\/td>\n<\/tr>\n
Output Enable<\/td>\nOE pin (active low)<\/td>\n<\/tr>\n
Ioff \u652f\u6301<\/td>\nYes (partial power-down safe)<\/td>\n<\/tr>\n
Schmitt Trigger<\/td>\nYes (on all inputs)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u00b0C to +125\u00b0C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nTSSOP-20 (6.5 x 4.4mm)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 8-bit bidirectional bus transceiver with 3-state outputs<\/li>\n
  • 5V tolerant inputs\/outputs for mixed 3.3V\/5V designs<\/li>\n
  • Wide supply voltage: 1.2V to 3.6V<\/li>\n
  • \u00b124mA balanced output drive<\/li>\n
  • DIR pin controls data direction (A\u2192B or B\u2192A)<\/li>\n
  • OE pin disables both buses (high-impedance)<\/li>\n
  • Schmitt-trigger inputs tolerate slow edge rates<\/li>\n
  • Ioff circuitry prevents backflow during power-down<\/li>\n
  • Direct interface with TTL and CMOS logic levels<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Mixed 3.3V\/5V voltage level translation<\/li>\n
    • Bus buffering and isolation<\/li>\n
    • Microprocessor I\/O port expansion<\/li>\n
    • Memory bus interface<\/li>\n
    • Backplane driving<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The 74LVC245APW is an octal bus transceiver from Nexperia with 3-state outputs, 5V tolerant I\/O, direction control, and 24mA drive in a TSSOP-20 package. Key Specifications Number of Bits 8 Supply Voltage (VCC) 1.2V to 3.6V Input Voltage Tolerance Up to 5.5V (overvoltage tolerant) Output Drive \u00b124mA Propagation Delay 17ns max (at 3.3V) […]<\/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-7881","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-ti"],"acf":{"brief_explanation":"Octal bus transceiver, 1.2-3.6V, 5V tolerant, 24mA, 3-state, TSSOP-20","date_code":"","package_case":"TSSOP-20 SOT360-1 (6.5 x 4.4 x 1.1mm, 0.65mm pitch)","in_stock":9791,"datasheet":"https:\/\/www.nexperia.com\/products\/logic\/buffers-drivers-transceivers\/74LVC245APW.html","price":"$0.17 @ 1ku","product_introduction":"The 74LVC245APW from Nexperia is an 8-bit bidirectional bus transceiver with 3-state outputs designed for asynchronous communication between data buses. The DIR (direction) pin selects whether data flows from the A bus to the B bus or vice versa. The OE (output enable) pin, when high, places both buses in high-impedance state for bus isolation. The 5V tolerant inputs and outputs enable direct interfacing between 3.3V and 5V logic systems without external level shifters. Schmitt-trigger inputs on all pins tolerate slow input edge rates, making the device suitable for\u63a5\u6536 signals from RC-filtered or open-drain sources. The Ioff circuitry ensures that when VCC is 0V, the I\/O pins present high impedance, preventing damaging backflow current in partial power-down scenarios. The \u00b124mA output drive capability can directly drive heavy capacitive loads or backplane traces. The APW suffix denotes the TSSOP-20 package.","working_principle":"The 74LVC245APW contains eight identical bidirectional transceiver cells, each connecting one A-bus pin to one B-bus pin through a pair of tristate buffers. When DIR is high, the A-to-B buffers are enabled and the B-to-A buffers are disabled, allowing data to flow from A to B. When DIR is low, the B-to-A buffers are enabled and data flows from B to A. The OE pin controls the overall enable: when OE is low, the selected direction is active; when OE is high, all buffers are disabled and both A and B buses are in high-impedance state. The 5V tolerance works because the input protection diodes clamp to VCC only when the input voltage exceeds VCC, but the Ioff circuitry disconnects these diodes when VCC is 0V, allowing the pin to float without drawing current. When the device is powered (VCC = 3.3V), the 5V-tolerant inputs can accept voltages up to 5.5V without forward-biasing the input diodes, because the protection structure is designed to tolerate this overvoltage. The Schmitt-trigger input stage provides hysteresis (typically 200mV at 3.3V), converting slowly rising or falling input signals into clean logic transitions.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>DIR<\/td>Input<\/td>Direction control (high=A\u2192B, low=B\u2192A)<\/td><\/tr>\n
      2<\/td>A1<\/td>I\/O<\/td>A-bus data pin 1<\/td><\/tr>\n
      3<\/td>A2<\/td>I\/O<\/td>A-bus data pin 2<\/td><\/tr>\n
      4<\/td>A3<\/td>I\/O<\/td>A-bus data pin 3<\/td><\/tr>\n
      5<\/td>A4<\/td>I\/O<\/td>A-bus data pin 4<\/td><\/tr>\n
      6<\/td>A5<\/td>I\/O<\/td>A-bus data pin 5<\/td><\/tr>\n
      7<\/td>A6<\/td>I\/O<\/td>A-bus data pin 6<\/td><\/tr>\n
      8<\/td>A7<\/td>I\/O<\/td>A-bus data pin 7<\/td><\/tr>\n
      9<\/td>A8<\/td>I\/O<\/td>A-bus data pin 8<\/td><\/tr>\n
      10<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>\n
      11<\/td>B8<\/td>I\/O<\/td>B-bus data pin 8<\/td><\/tr>\n
      12<\/td>B7<\/td>I\/O<\/td>B-bus data pin 7<\/td><\/tr>\n
      13<\/td>B6<\/td>I\/O<\/td>B-bus data pin 6<\/td><\/tr>\n
      14<\/td>B5<\/td>I\/O<\/td>B-bus data pin 5<\/td><\/tr>\n
      15<\/td>B4<\/td>I\/O<\/td>B-bus data pin 4<\/td><\/tr>\n
      16<\/td>B3<\/td>I\/O<\/td>B-bus data pin 3<\/td><\/tr>\n
      17<\/td>B2<\/td>I\/O<\/td>B-bus data pin 2<\/td><\/tr>\n
      18<\/td>B1<\/td>I\/O<\/td>B-bus data pin 1<\/td><\/tr>\n
      19<\/td>OE<\/td>Input<\/td>Output enable (active low)<\/td><\/tr>\n
      20<\/td>VCC<\/td>Power<\/td>Supply (1.2V to 3.6V)<\/td><\/tr>\n<\/table>","application_scenarios":"
        \n
      • Level Translation:<\/strong> 5V tolerant I\/O translates between 3.3V MCU and 5V peripheral buses without external level shifters<\/li>\n
      • Bus Isolation:<\/strong> OE pin disconnects two buses during hot-plug or debug, preventing contention between drivers<\/li>\n
      • Buffering:<\/strong> \u00b124mA drive boosts 3.3V MCU output current for long PCB traces or backplane loads<\/li>\n
      • Memory Interface:<\/strong> DIR and OE provide read\/write direction control for shared memory bus between CPU and DMA<\/li>\n
      • Power-Down Safe:<\/strong> Ioff prevents backflow when one side of the bus is powered while the other is off (hot-swap)<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Supply<\/th><\/tr>\n
        74LS245N<\/td>TI\/Nexperia<\/td>Original TTL version with 5V-only supply, typical propagation delay 10-15ns<\/td>DIP-20<\/td>5V TTL<\/td><\/tr>\n
        74LS245D<\/td>TI\/Nexperia<\/td>Surface-mount SOIC version of LS with identical logic function<\/td>SOIC-20<\/td>5V TTL<\/td><\/tr>\n
        74HC245D<\/td>TI\/Nexperia<\/td>CMOS version with wide 2-6V supply range, lower power consumption and higher noise immunity<\/td>SOIC-20<\/td>2-6V CMOS<\/td><\/tr>\n
        74HC245N<\/td>TI\/Nexperia<\/td>Through-hole DIP version of HC family for prototyping and repair<\/td>DIP-20<\/td>2-6V CMOS<\/td><\/tr>\n
        74HCT245D<\/td>TI\/Nexperia<\/td>CMOS with TTL-compatible input levels, ideal for mixing with LS devices at 5V<\/td>SOIC-20<\/td>4.5-5.5V TTL-in<\/td><\/tr>\n
        74HCT245N<\/td>TI\/Nexperia<\/td>Through-hole DIP version of HCT family for prototyping and repair<\/td>DIP-20<\/td>4.5-5.5V TTL-in<\/td><\/tr>\n
        74LVC245D<\/td>TI\/Nexperia<\/td>Low-voltage CMOS for 1.65-3.6V modern logic with 24mA output drive and bus-hold inputs<\/td>SOIC-20<\/td>1.65-3.6V CMOS<\/td><\/tr>\n
        74LVC245N<\/td>TI\/Nexperia<\/td>Through-hole DIP version of LVC family for prototyping and repair<\/td>DIP-20<\/td>1.65-3.6V CMOS<\/td><\/tr>\n
        74AUP245D<\/td>TI\/Nexperia<\/td>Ultra-low power CMOS with 0.8-3.6V supply for battery-powered and mobile applications<\/td>SOIC-20<\/td>0.8-3.6V CMOS<\/td><\/tr>\n
        74AUP245N<\/td>TI\/Nexperia<\/td>Through-hole DIP version of AUP family for prototyping and repair<\/td>DIP-20<\/td>0.8-3.6V CMOS<\/td><\/tr>\n<\/table>\n

        The 74245 is a Octal Bus Transceiver with 3-State Output. 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\/7881","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=7881"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7881\/revisions"}],"predecessor-version":[{"id":8208,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7881\/revisions\/8208"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=7881"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=7881"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=7881"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=7881"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}