{"id":3552,"date":"2026-06-06T10:25:47","date_gmt":"2026-06-06T10:25:47","guid":{"rendered":"https:\/\/materialparts.com\/max487esat\/"},"modified":"2026-06-06T10:25:47","modified_gmt":"2026-06-06T10:25:47","slug":"max487esat","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/max487esat\/","title":{"rendered":"MAX487ESA+T"},"content":{"rendered":"

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

The MAX487ESA+T from Analog Devices (formerly Maxim) is a low-power, slew-rate-limited RS-485\/RS-422 transceiver with 1 driver and 1 receiver. Operating from a single 5V supply, its 1\/4 unit-load receiver input impedance allows up to 128 transceivers on one bus. The slew-rate-limited driver minimizes EMI and reflections for error-free 250 kbps communication. The ESA+T denotes the SOIC-8 industrial-temperature tape-and-reel version.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
\u7c7b\u578b<\/td>\nRS-485\/RS-422 Transceiver<\/td>\n<\/tr>\n
Drivers \/ Receivers<\/td>\n1 \/ 1<\/td>\n<\/tr>\n
Duplex<\/td>\nHalf<\/td>\n<\/tr>\n
\u6570\u636e\u901f\u7387<\/td>\n250 kbps (slew-rate limited)<\/td>\n<\/tr>\n
\u7535\u6e90\u7535\u538b<\/td>\n4.75V – 5.25V (5V nominal)<\/td>\n<\/tr>\n
\u9759\u6001\u7535\u6d41<\/td>\n120 uA (typical)<\/td>\n<\/tr>\n
\u5173\u673a\u7535\u6d41<\/td>\n0.1 uA<\/td>\n<\/tr>\n
Unit Load<\/td>\n1\/4 (up to 128 nodes)<\/td>\n<\/tr>\n
ESD Protection<\/td>\n\u00b115 kV HBM<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSOIC-8 Narrow<\/td>\n<\/tr>\n
Operating Temp<\/td>\n-40 to 85 C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 1\/4 unit load allows 128 transceivers on a single bus<\/li>\n
  • Slew-rate-limited driver minimizes EMI and reflections<\/li>\n
  • Ultra-low 120 uA quiescent supply current<\/li>\n
  • 0.1 uA shutdown current for battery-powered applications<\/li>\n
  • \u00b115 kV ESD protection on bus pins<\/li>\n
  • Short-circuit current limited driver with thermal shutdown<\/li>\n
  • Open-circuit fail-safe receiver output (logic high)<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Industrial control LANs: Multi-drop RS-485 networks<\/li>\n
    • Level translators: RS-485 to TTL\/CMOS conversion<\/li>\n
    • EMI-sensitive applications: Slew-rate limited for reduced emissions<\/li>\n
    • Building automation: HVAC and security system networks<\/li>\n
    • Low-power RS-422\/RS-485 transceivers<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The MAX487ESA+T from Analog Devices (formerly Maxim) is a low-power, slew-rate-limited RS-485\/RS-422 transceiver with 1 driver and 1 receiver. Operating from a single 5V supply, its 1\/4 unit-load receiver input impedance allows up to 128 transceivers on one bus. The slew-rate-limited driver minimizes EMI and reflections for error-free 250 kbps communication. The ESA+T […]<\/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":[165],"class_list":["post-3552","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-adi"],"acf":{"brief_explanation":"RS-485\/RS-422 transceiver, 250kbps, 1\/4 unit load (128 nodes), SOIC-8, -40-85C","date_code":"","package_case":"SOIC-8 Narrow (3.90 x 4.90 x 1.27 mm)","in_stock":12182,"datasheet":"https:\/\/www.analog.com\/media\/en\/technical-documentation\/data-sheets\/MAX1487-MAX491.pdf","price":"$2.12 @ 1ku","product_introduction":"The MAX487ESA+T from Analog Devices (formerly Maxim Integrated) is a low-power, slew-rate-limited RS-485\/RS-422 transceiver containing one driver and one receiver for half-duplex communication. Its 1\/4 unit-load receiver input impedance (48 kOhm) allows up to 128 transceivers to share a single bus, quadrupling the node count of standard RS-485 transceivers. The reduced slew-rate driver minimizes EMI and reflections caused by improperly terminated cables, enabling error-free data transmission up to 250 kbps. With 120 uA quiescent current and 0.1 uA shutdown current, it is optimized for battery-powered and low-power applications.","working_principle":"The MAX487ESA+T converts between TTL\/CMOS logic levels and RS-485\/RS-422 differential signal levels. The driver uses a current-limiting output stage that drives the A and B bus lines with complementary signals: a logic low on DI drives A high and B low (differential output), while a logic high or tri-state leaves both outputs high impedance. The slew-rate limiting is achieved by controlling the output transition time to approximately 250 ns, which reduces high-frequency spectral content that causes EMI and cable reflections. The receiver has a 70 mV hysteresis for noise immunity and a fail-safe circuit that guarantees a logic-high output when the inputs are open-circuited.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>RO<\/td>Output<\/td>Receiver output<\/td><\/tr>
      2<\/td>RE<\/td>Input<\/td>Receiver enable (active low)<\/td><\/tr>
      3<\/td>DE<\/td>Input<\/td>Driver enable (active high)<\/td><\/tr>
      4<\/td>DI<\/td>Input<\/td>Driver data input<\/td><\/tr>
      5<\/td>GND<\/td>Ground<\/td>Ground<\/td><\/tr>
      6<\/td>A<\/td>I\/O<\/td>Non-inverting bus I\/O<\/td><\/tr>
      7<\/td>B<\/td>I\/O<\/td>Inverting bus I\/O<\/td><\/tr>
      8<\/td>VCC<\/td>Power<\/td>Supply voltage (4.75-5.25V)<\/td><\/tr><\/table>","application_scenarios":"
      • Industrial LANs: Multi-drop RS-485 networks with up to 128 nodes per bus<\/li>
      • Building automation: BACnet MS\/TP and Modbus RTU slave devices<\/li>
      • EMI-sensitive systems: Slew-rate limiting for cables > 1000 ft<\/li>
      • Battery-powered instruments: 0.1 uA shutdown current for long battery life<\/li>
      • Security systems: RS-485 networked cameras and access controllers<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        TI<\/td>SN65HVD75DR<\/td>SOIC-8<\/td>3.3V\/5V RS-485, 500kbps, 1\/8 UL<\/td><\/tr>
        MaxLinear<\/td>SP3485EN-L\/TR<\/td>SOIC-8<\/td>3.3V RS-485, 10Mbps, 1\/4 UL<\/td><\/tr>
        ADI<\/td>MAX3082ESA+T<\/td>SOIC-8<\/td>115kbps, 1\/8 UL, 256 nodes<\/td><\/tr>
        TI<\/td>THVD1500DR<\/td>SOIC-8<\/td>500kbps, 1\/8 UL, 3.3-5V<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/3552","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=3552"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/3552\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=3552"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=3552"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=3552"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=3552"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}