{"id":10712,"date":"2026-07-20T10:41:51","date_gmt":"2026-07-20T10:41:51","guid":{"rendered":"https:\/\/ic-vendor.com\/pca9548apwr\/"},"modified":"2026-07-20T10:41:51","modified_gmt":"2026-07-20T10:41:51","slug":"pca9548apwr","status":"publish","type":"post","link":"https:\/\/ic-vendor.com\/zh\/pca9548apwr\/","title":{"rendered":"PCA9548APWR"},"content":{"rendered":"

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

The PCA9548APWR is an 8-channel I2C\/SMBus switch from Texas Instruments with reset and voltage level translation capabilities. Packaged in a 24-pin TSSOP (PW), it operates from 2.3 V to 5.5 V and allows a single I2C master to communicate with up to eight downstream I2C buses. The device features an active-low reset input and supports voltage translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n
\u529f\u80fd<\/td>\n8-Channel I2C\/SMBus Switch<\/td>\n<\/tr>\n
Supply Voltage Range<\/td>\n2.3 V to 5.5 V<\/td>\n<\/tr>\n
\u901a\u9053\u6570<\/td>\n8 (1 upstream, 8 downstream pairs)<\/td>\n<\/tr>\n
Max Clock Frequency<\/td>\n400 kHz (Fast Mode)<\/td>\n<\/tr>\n
On-Resistance<\/td>\n15 \u03a9 typical<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\n24-TSSOP (PW) \u2014 7.8 x 6.4 mm<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u00b0C to +85\u00b0C<\/td>\n<\/tr>\n
\u9759\u6001\u7535\u6d41<\/td>\n50 \u00b5A typical<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 8 bidirectional translating switches for I2C bus expansion<\/li>\n
  • Active-low RESET input for bus recovery without power cycling<\/li>\n
  • Three hardware address pins allow up to eight devices on one bus<\/li>\n
  • Supports voltage level translation between 1.8 V and 5 V buses<\/li>\n
  • 5 V tolerant I\/O pins for mixed-voltage systems<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Servers and networking equipment with multiple I2C devices<\/li>\n
    • Resolving I2C slave address conflicts<\/li>\n
    • Mixed-voltage I2C bus bridging<\/li>\n
    • Factory automation and industrial control systems<\/li>\n
    • Telecommunication switching equipment<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The PCA9548APWR is an 8-channel I2C\/SMBus switch from Texas Instruments with reset and voltage level translation capabilities. Packaged in a 24-pin TSSOP (PW), it operates from 2.3 V to 5.5 V and allows a single I2C master to communicate with up to eight downstream I2C buses. The device features an active-low reset input […]<\/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":[2052],"chip_brand":[138],"class_list":["post-10712","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","tag-pca9548apwr","chip_brand-ti"],"acf":{"brief_explanation":"8-channel I2C switch, 2.3\u20135.5 V, reset, voltage translation, 24-TSSOP, 400 kHz","date_code":"","package_case":"24-TSSOP (PW) \u2014 7.8 x 6.4 mm","in_stock":10367,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/pca9548a.pdf","price":"$0.60 @ 1ku","product_introduction":"The PCA9548A is an 8-channel I2C\/SMBus switch from Texas Instruments that allows a single I2C master to communicate with up to eight downstream I2C buses. Each channel can be individually selected or combined via a programmable control register. The device features an active-low RESET input for recovering from bus hang conditions, and supports voltage level translation allowing 1.8 V, 2.5 V, or 3.3 V devices to communicate with 5 V devices. Three hardware address pins enable up to eight PCA9548A devices on the same I2C bus.","working_principle":"The PCA9548A operates as an I2C-controlled multiplexer for I2C buses. After the master sends the device address (selectable via A0-A2 pins), an 8-bit control register is written to select which downstream channels are enabled. Each bit in the control register corresponds to one of the eight SCx\/SDx channel pairs. When a channel is enabled, the SCL\/SDA signals pass bidirectionally between the upstream master and the selected downstream bus. The pass-gate structure allows voltage level translation: the VCC pin limits the maximum voltage passed, while external pull-up resistors on each channel set the bus voltage level independently.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>A0<\/td>Input<\/td>Hardware address bit 0<\/td><\/tr>
      2<\/td>A1<\/td>Input<\/td>Hardware address bit 1<\/td><\/tr>
      3<\/td>A2<\/td>Input<\/td>Hardware address bit 2<\/td><\/tr>
      4\u201311<\/td>SD0\u2013SD7<\/td>I\/O<\/td>Downstream SDA channels 0\u20137<\/td><\/tr>
      12<\/td>GND<\/td>Power<\/td>Ground reference<\/td><\/tr>
      13\u201320<\/td>SC0\u2013SC7<\/td>I\/O<\/td>Downstream SCL channels 0\u20137<\/td><\/tr>
      21<\/td>SDA<\/td>I\/O<\/td>Upstream I2C data<\/td><\/tr>
      22<\/td>SCL<\/td>I\/O<\/td>Upstream I2C clock<\/td><\/tr>
      23<\/td>RESET<\/td>Input<\/td>Active-low reset<\/td><\/tr>
      24<\/td>VCC<\/td>Power<\/td>Supply voltage (2.3\u20135.5 V)<\/td><\/tr><\/table>","application_scenarios":"
      • Connecting multiple identical I2C sensors with address conflicts<\/li>
      • Voltage translation between 3.3 V MCU and 5 V I2C peripherals<\/li>
      • Server BMC management bus expansion<\/li>
      • Industrial PLC I2C device isolation and routing<\/li>
      • Multi-display system I2C bus management<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        TI<\/td>TCA9548APWR<\/td>24-TSSOP<\/td>Enhanced version, wider VCC range<\/td><\/tr>
        NXP<\/td>PCA9548APW<\/td>24-TSSOP<\/td>Original manufacturer equivalent<\/td><\/tr>
        TI<\/td>PCA9546APW<\/td>16-TSSOP<\/td>4-channel version<\/td><\/tr>
        Microchip<\/td>MCP23T08-E\/MQ<\/td>24-QFN<\/td>I2C switch alternative<\/td><\/tr>
        onsemi<\/td>NCN9801MNTXG<\/td>24-QFN<\/td>I2C level translator alternative<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/10712","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/comments?post=10712"}],"version-history":[{"count":0,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/10712\/revisions"}],"wp:attachment":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/media?parent=10712"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/categories?post=10712"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/tags?post=10712"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=10712"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}