{"id":10640,"date":"2026-07-20T09:16:56","date_gmt":"2026-07-20T09:16:56","guid":{"rendered":"https:\/\/ic-vendor.com\/p82b715dr\/"},"modified":"2026-07-20T09:16:56","modified_gmt":"2026-07-20T09:16:56","slug":"p82b715dr","status":"publish","type":"post","link":"https:\/\/ic-vendor.com\/zh\/p82b715dr\/","title":{"rendered":"P82B715DR"},"content":{"rendered":"

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

The P82B715DR is a dual bidirectional I2C bus extender from Texas Instruments, packaged in an 8-pin SOIC (D) package. It extends the I2C bus communication distance up to 50 meters using twisted-pair cables by transforming the bus impedance by a factor of 10. The device operates from 3V to 12V and supports standard and fast-mode I2C at up to 400 kHz.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n
\u529f\u80fd<\/td>\nI2C Bus Extender \/ Buffer<\/td>\n<\/tr>\n
\u6e20\u9053<\/td>\n2 (SDA and SCL)<\/td>\n<\/tr>\n
\u7535\u6e90\u7535\u538b<\/td>\n3V to 12V (4.5-12V recommended)<\/td>\n<\/tr>\n
I2C Speed<\/td>\nUp to 400 kHz<\/td>\n<\/tr>\n
Bus Capacitance (Sx\/Sy)<\/td>\n400 pF<\/td>\n<\/tr>\n
Bus Capacitance (Lx\/Ly)<\/td>\n3000 pF<\/td>\n<\/tr>\n
Impedance Transformation<\/td>\n10x<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSOIC-8 (4.9 \u00d7 3.91 mm)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u00b0C to +85\u00b0C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Extends I2C bus up to 50 meters over twisted-pair wire<\/li>\n
  • 10x impedance transformation for improved noise immunity<\/li>\n
  • Bidirectional unity-voltage-gain buffer \u2014 no directional control needed<\/li>\n
  • Supports multi-drop distribution using low-cost cables<\/li>\n
  • No external directional control required<\/li>\n
  • ESD protection exceeds 2500V HBM<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Industrial I2C bus extension over long cables<\/li>\n
    • Multi-drop I2C signal distribution<\/li>\n
    • AdvancedTCA radial IPMB applications<\/li>\n
    • Building automation networks<\/li>\n
    • Security and access control systems<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The P82B715DR is a dual bidirectional I2C bus extender from Texas Instruments, packaged in an 8-pin SOIC (D) package. It extends the I2C bus communication distance up to 50 meters using twisted-pair cables by transforming the bus impedance by a factor of 10. The device operates from 3V to 12V and supports standard […]<\/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":[1981],"chip_brand":[138],"class_list":["post-10640","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","tag-p82b715dr","chip_brand-ti"],"acf":{"brief_explanation":"Dual bidirectional I2C bus extender, 3-12V, 400kHz, 50m cable, 10x impedance, SOIC-8","date_code":"","package_case":"SOIC-8 (4.9 \u00d7 3.91 \u00d7 1.45 mm)","in_stock":11205,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/p82b715.pdf","price":"$0.94 @ 1ku","product_introduction":"The P82B715 is a bipolar I2C bus extender that supports bidirectional data transfer, allowing I2C signals to be transmitted over distances far exceeding the standard 400 pF bus capacitance limit. It achieves this through a 10x impedance transformation that effectively reduces the apparent capacitance of long cable runs. The Lx\/Ly buffered bus side can handle up to 3000 pF of total capacitance, enabling cable lengths of 50 meters or more with twisted-pair wiring. No external directional control is needed as the device automatically handles the bidirectional nature of I2C communication.","working_principle":"The P82B715 operates as a dual bidirectional unity-voltage-gain buffer using analog current amplification. On the Sx\/Sy side (local I2C bus), the device presents standard I2C input characteristics. On the Lx\/Ly side (buffered\/extended bus), it increases the current sink capability by a factor of 10, effectively transforming the 400 pF I2C bus specification into a 4000 pF (4 nF) bus capacitance limit. When the I2C master drives Sx\/Sy low, the internal amplifier drives Lx\/Ly low with 30 mA sink capability. Conversely, when a remote device on the Lx\/Ly bus pulls low, the corresponding Sx\/Sy line follows within 100 mV. This transparent bidirectional operation preserves all I2C modes and features without requiring any directional control signals.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>N.C.<\/td>\u2014<\/td>No connect<\/td><\/tr>
      2<\/td>Lx<\/td>I\/O<\/td>Buffered SDA \u2014 connect to extended bus side<\/td><\/tr>
      3<\/td>Sx<\/td>I\/O<\/td>Local SDA \u2014 connect to local I2C bus<\/td><\/tr>
      4<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>
      5<\/td>Sy<\/td>I\/O<\/td>Local SCL \u2014 connect to local I2C bus<\/td><\/tr>
      6<\/td>Ly<\/td>I\/O<\/td>Buffered SCL \u2014 connect to extended bus side<\/td><\/tr>
      7<\/td>N.C.<\/td>\u2014<\/td>No connect<\/td><\/tr>
      8<\/td>VCC<\/td>Power<\/td>Supply voltage (3V to 12V)<\/td><\/tr><\/table>","application_scenarios":"
      • Extending I2C bus between boards in industrial equipment racks<\/li>
      • Remote sensor nodes connected via twisted-pair cable<\/li>
      • AdvancedTCA IPMB bus extension in telecom chassis<\/li>
      • Multi-drop I2C distribution in building automation<\/li>
      • Level translation using external transistor with P82B715<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        TI<\/td>P82B96DR<\/td>SOIC-8<\/td>Full-duplex I2C buffer, voltage offset<\/td><\/tr>
        NXP<\/td>PCA9615<\/td>TSSOP-10<\/td>Differential I2C bus extender<\/td><\/tr>
        ADI<\/td>LTC4331<\/td>DFN-16<\/td>SPI\/I2C extender over single pair<\/td><\/tr>
        Maxim<\/td>MAX15301<\/td>TQFN-24<\/td>I2C bus buffer with level translation<\/td><\/tr>
        NXP<\/td>PCA9509<\/td>SOIC-8<\/td>I2C bus repeater with level shift<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/10640","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=10640"}],"version-history":[{"count":0,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/10640\/revisions"}],"wp:attachment":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/media?parent=10640"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/categories?post=10640"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/tags?post=10640"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=10640"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}