{"id":5464,"date":"2026-06-10T02:25:15","date_gmt":"2026-06-10T02:25:15","guid":{"rendered":"https:\/\/materialparts.com\/sn74lvc4245apwr\/"},"modified":"2026-06-10T02:25:15","modified_gmt":"2026-06-10T02:25:15","slug":"sn74lvc4245apwr","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/sn74lvc4245apwr\/","title":{"rendered":"SN74LVC4245APWR"},"content":{"rendered":"

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

The SN74LVC4245APWR from Texas Instruments is an octal bidirectional level-shifting bus transceiver in a 24-pin TSSOP package. It translates between 3.3V (B port) and 5V (A port) logic levels with 3-state outputs, direction control, and output enable, designed for asynchronous communication between mixed-voltage data buses.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u529f\u80fd<\/td>\nOctal bus transceiver and level shifter<\/td>\n<\/tr>\n
\u6e20\u9053<\/td>\n8 (bidirectional)<\/td>\n<\/tr>\n
VCCA (A Port)<\/td>\n4.5V to 5.5V<\/td>\n<\/tr>\n
VCCB (B Port)<\/td>\n2.7V \u81f3 3.6V<\/td>\n<\/tr>\n
Translation<\/td>\n3.3V to 5V and 5V to 3.3V<\/td>\n<\/tr>\n
Direction Control<\/td>\nDIR pin (A-to-B or B-to-A)<\/td>\n<\/tr>\n
Output Enable<\/td>\nOE pin (active low, 3-state)<\/td>\n<\/tr>\n
Control Voltage Ref<\/td>\nVCCA (DIR and OE referenced to A-side)<\/td>\n<\/tr>\n
\u8f93\u51fa\u7c7b\u578b<\/td>\n3-state<\/td>\n<\/tr>\n
\u4f20\u64ad\u5ef6\u8fdf<\/td>\n~4ns typ<\/td>\n<\/tr>\n
Latch-Up<\/td>\n>250mA per JESD 17<\/td>\n<\/tr>\n
ESD<\/td>\n2000V HBM, 200V MM, 1000V CDM<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40 to +85 C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nTSSOP-24\uff087.8 x 4.4 \u6beb\u7c73\uff09<\/td>\n<\/tr>\n
Status<\/td>\n\u6d3b\u8dc3<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Octal bidirectional level-shifting transceiver<\/li>\n
  • 3.3V to 5V \/ 5V to 3.3V voltage translation<\/li>\n
  • Direction control via DIR pin<\/li>\n
  • 3-state output enable via OE pin<\/li>\n
  • Pin-compatible with standard 245 transceiver layout<\/li>\n
  • Control inputs referenced to VCCA<\/li>\n
  • >250mA latch-up immunity<\/li>\n
  • High ESD protection (2kV HBM)<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • 5V to 3.3V logic level translation<\/li>\n
    • Microcontroller to 5V peripheral interface<\/li>\n
    • Mixed-voltage bus communication<\/li>\n
    • PCI\/ISA bus bridging<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The SN74LVC4245APWR from Texas Instruments is an octal bidirectional level-shifting bus transceiver in a 24-pin TSSOP package. It translates between 3.3V (B port) and 5V (A port) logic levels with 3-state outputs, direction control, and output enable, designed for asynchronous communication between mixed-voltage data buses. Key Specifications Function Octal bus transceiver and level […]<\/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":[138],"class_list":["post-5464","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-ti"],"acf":{"brief_explanation":"Octal 3.3V-5V bidirectional level shifter, TSSOP-24","date_code":"","package_case":"TSSOP-24 (7.8 x 4.4 x 1.1 mm)","in_stock":5470,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/sn74lvc4245a.pdf","price":"$0.24 @ 1ku","product_introduction":"The SN74LVC4245APWR from Texas Instruments is an octal bidirectional level-shifting bus transceiver in a 24-pin TSSOP package. The PW denotes TSSOP-24, R denotes tape and reel (2000 pcs\/reel). The device provides 8-bit bidirectional voltage translation between a 5V A port (VCCA = 4.5-5.5V) and a 3.3V B port (VCCB = 2.7-3.6V). The DIR pin selects the data direction: high for A-to-B, low for B-to-A. The active-low OE pin disables both ports to a high-impedance 3-state, effectively isolating the buses. Control inputs (DIR, OE) are referenced to VCCA, so they are 5V logic level. The pinout is designed to align with standard 245-type transceiver layouts (pins 2-11 and 14-23 carry data), allowing a designer to switch between an all-3.3V or all-5V standard 245 device and the SN74LVC4245A without board re-layout. The dual-supply architecture enables true level translation: the A port outputs swing to VCCA (5V) and the B port outputs swing to VCCB (3.3V).","working_principle":"The SN74LVC4245APWR operates through three subsystems: (1) Dual-Supply Architecture: The A port I\/O buffers are powered by VCCA (4.5-5.5V), and the B port I\/O buffers are powered by VCCB (2.7-3.6V). This ensures that output voltages on each side are appropriate for the connected logic domain. When an A-port output drives high, it drives to VCCA (5V); when a B-port output drives high, it drives to VCCB (3.3V). (2) Direction Control: The DIR pin (referenced to VCCA) determines data flow direction. When DIR is high, data flows from A1-A8 to B1-B8 (5V to 3.3V translation). When DIR is low, data flows from B1-B8 to A1-A8 (3.3V to 5V translation). The direction applies to all 8 channels simultaneously. (3) Output Enable: The active-low OE pin (referenced to VCCA) controls the 3-state outputs. When OE is high, both A and B port outputs are in high-impedance state, isolating the two buses. When OE is low, the selected direction is active. Both ports can never drive simultaneously in opposite directions, preventing bus contention.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>
      1<\/td>DIR<\/td>Input<\/td>Direction control (H=A-to-B, L=B-to-A)<\/td><\/tr>
      2-9<\/td>A1-A8<\/td>I\/O<\/td>A port data (5V domain)<\/td><\/tr>
      10<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>
      11<\/td>OE<\/td>Input<\/td>Output enable (active low)<\/td><\/tr>
      12-19<\/td>B1-B8<\/td>I\/O<\/td>B port data (3.3V domain)<\/td><\/tr>
      20<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>
      21<\/td>VCCB<\/td>Power<\/td>B port supply (2.7-3.6V)<\/td><\/tr>
      22-24<\/td>NC<\/td>-<\/td>No connect<\/td><\/tr>
      -<\/td>VCCA<\/td>Power<\/td>A port supply (4.5-5.5V), pin 23 or power pin<\/td><\/tr><\/table>","application_scenarios":"
      • 5V microcontroller to 3.3V peripheral bus level translation with DIR controlled by MCU GPIO for bidirectional data transfer<\/li>
      • 3.3V FPGA communicating with 5V legacy ISA\/PCI bus using 8-bit bidirectional level shifting with OE for bus isolation<\/li>
      • Mixed-voltage data acquisition system with 5V ADC and 3.3V processor sharing an 8-bit parallel bus through the transceiver<\/li>
      • Industrial control module bridging 3.3V logic to 5V industrial I\/O with latch-up immunity above 250mA<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Translation<\/th>Package<\/th>Notes<\/th><\/tr>
        SN74LVC4245ADWR<\/td>TI<\/td>3.3V\/5V<\/td>SOIC-24<\/td>Wider SOIC package<\/td><\/tr>
        SN74LVC16245ADGVR<\/td>TI<\/td>3.3V\/5V<\/td>TSSOP-48<\/td>16-bit version<\/td><\/tr>
        74LVC4245PW<\/td>NXP<\/td>3.3V\/5V<\/td>TSSOP-24<\/td>Pin-compatible<\/td><\/tr>
        FXMA108BQX<\/td>onsemi\/Fairchild<\/td>Adjustable<\/td>QFN-20<\/td>Auto-direction sensing<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5464","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=5464"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5464\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=5464"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=5464"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=5464"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=5464"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}