{"id":7005,"date":"2026-06-22T12:43:42","date_gmt":"2026-06-22T12:43:42","guid":{"rendered":"https:\/\/materialparts.com\/sn65hvd1781dr-2\/"},"modified":"2026-06-22T12:43:42","modified_gmt":"2026-06-22T12:43:42","slug":"sn65hvd1781dr-2","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/sn65hvd1781dr-2\/","title":{"rendered":"SN65HVD1781DR"},"content":{"rendered":"

\u0646\u0638\u0631\u0629 \u0639\u0627\u0645\u0629 \u0639\u0644\u0649 \u0627\u0644\u0645\u0646\u062a\u062c<\/h2>\n

The SN65HVD1781DR from Texas Instruments is a fault-protected RS-485\/RS-422 transceiver in an SOIC-8 package. It provides \u00b170V bus-pin fault protection, \u00b116kV HBM ESD protection, and operates from 3.3V to 5V supply. With 1\/10 unit load, up to 320 nodes can share a single bus. The device supports signaling rates up to 1Mbps and features a low 1\u00b5A standby current.<\/p>\n

\u0627\u0644\u0645\u0648\u0627\u0635\u0641\u0627\u062a \u0627\u0644\u0631\u0626\u064a\u0633\u064a\u0629<\/h2>\n\n\n\n\n\n\n\n\n\n\n
Bus-Pin Fault Protection<\/td>\n\u00b170V<\/td>\n<\/tr>\n
Signaling Rate<\/td>\nUp to 1Mbps<\/td>\n<\/tr>\n
\u062c\u0647\u062f \u0627\u0644\u0625\u0645\u062f\u0627\u062f<\/td>\n3.3V ~ 5V<\/td>\n<\/tr>\n
ESD Protection<\/td>\n\u00b116kV HBM on bus pins<\/td>\n<\/tr>\n
Unit Load<\/td>\n1\/10 (up to 320 nodes)<\/td>\n<\/tr>\n
\u0627\u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u0627\u062d\u062a\u064a\u0627\u0637\u064a<\/td>\n1\u00b5A (Maximum)<\/td>\n<\/tr>\n
Operating Current<\/td>\n4mA (Quiescent)<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\nSOIC-8 (4.90 x 3.90mm)<\/td>\n<\/tr>\n
\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n-40\u00b0C ~ +125\u00b0C<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • \u00b170V bus-pin fault protection against mis-wiring<\/li>\n
  • \u00b116kV HBM ESD protection on bus pins<\/li>\n
  • 3.3V to 5V single supply operation<\/li>\n
  • 1\/10 unit load for up to 320 transceivers on one bus<\/li>\n
  • Failsafe receiver for open, short, and idle bus conditions<\/li>\n
  • Low 1\u00b5A maximum standby supply current<\/li>\n
  • Pin-compatible with industry-standard SN75176<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • HVAC networks<\/li>\n
    • Building automation<\/li>\n
    • Industrial networks<\/li>\n
    • Security electronics<\/li>\n
    • Telecommunication equipment<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The SN65HVD1781DR from Texas Instruments is a fault-protected RS-485\/RS-422 transceiver in an SOIC-8 package. It provides \u00b170V bus-pin fault protection, \u00b116kV HBM ESD protection, and operates from 3.3V to 5V supply. With 1\/10 unit load, up to 320 nodes can share a single bus. The device supports signaling rates up to 1Mbps and […]<\/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-7005","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-ti"],"acf":{"brief_explanation":"70V fault-protected RS-485 transceiver, 3.3-5V, 1Mbps, \u00b116kV ESD, 320 nodes in SOIC-8","date_code":"","package_case":"SOIC-8 (4.90 x 3.90 x 1.75 mm) D-8","in_stock":7300,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/sn65hvd1780.pdf","price":"$1.90 @ 1ku","product_introduction":"The SN65HVD1781DR is designed to survive overvoltage faults such as direct shorts to power supplies, mis-wiring faults, connector failures, and cable crushes. The \u00b170V bus-pin fault protection far exceeds the \u00b112V common-mode range required by the RS-485 standard. The device combines a differential driver and differential receiver operating from a single 3.3V to 5V supply. It is pin-compatible with the industry-standard SN75176, making it a drop-in upgrade with significantly improved fault tolerance.","working_principle":"The SN65HVD1781 uses a differential signaling scheme where data is transmitted as a voltage difference between the A and B bus lines. The driver converts single-ended TXD input into differential bus signals, while the receiver converts differential bus signals back to single-ended RXD output. The \u00b170V fault protection is achieved through robust bus-pin circuitry that can withstand accidental connection to power supplies. The failsafe receiver biases the output high when the bus is open, shorted, or idle (all drivers off), preventing undefined output states. The 1\/10 unit load design reduces bus loading to allow 320 transceivers on a single bus.","pin_description":"
      Pin<\/th>Name<\/th>Function<\/th><\/tr>
      1<\/td>R<\/td>Receiver output (CMOS compatible)<\/td><\/tr>
      2<\/td>\/RE<\/td>Receiver enable (active low)<\/td><\/tr>
      3<\/td>DE<\/td>Driver enable (active high)<\/td><\/tr>
      4<\/td>D<\/td>Driver input (CMOS compatible)<\/td><\/tr>
      5<\/td>GND<\/td>Ground reference<\/td><\/tr>
      6<\/td>A<\/td>Bus side non-inverting I\/O<\/td><\/tr>
      7<\/td>B<\/td>Bus side inverting I\/O<\/td><\/tr>
      8<\/td>VCC<\/td>Supply voltage (3.3V or 5V)<\/td><\/tr><\/table>","application_scenarios":"
      • Building Automation Bus<\/b>: \u00b170V fault protection survives mis-wiring during building construction and maintenance<\/li>
      • Industrial Multi-Drop Network<\/b>: 1\/10 unit load allows 320 sensor nodes on a single RS-485 bus segment<\/li>
      • Security System Interconnect<\/b>: Failsafe receiver ensures defined state during cable cuts or connector failures<\/li>
      • 3.3V MCU Interface<\/b>: 3.3V operation eliminates level shifting when used with modern low-voltage microcontrollers<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Key Difference<\/th><\/tr>
        SN65HVD1780DR<\/td>TI<\/td>Full-duplex version (separate TX\/RX pins)<\/td><\/tr>
        SN65HVD1782DR<\/td>TI<\/td>\u00b130V fault protection, 10Mbps<\/td><\/tr>
        THVD1500DR<\/td>TI<\/td>500kbps, lower cost, 3.3-5V<\/td><\/tr>
        SP3485EN<\/td>MaxLinear<\/td>3.3V, 10Mbps, SOIC-8<\/td><\/tr>
        ADM3485EARZ<\/td>ADI<\/td>3.3V, 12Mbps, \u00b115kV ESD<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7005","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/comments?post=7005"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7005\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=7005"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=7005"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=7005"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=7005"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}