{"id":7884,"date":"2026-06-28T03:14:37","date_gmt":"2026-06-28T03:14:37","guid":{"rendered":"https:\/\/materialparts.com\/sp3485en-l\/"},"modified":"2026-06-28T11:39:35","modified_gmt":"2026-06-28T11:39:35","slug":"sp3485en-l","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/sp3485en-l\/","title":{"rendered":"SP3485EN-L"},"content":{"rendered":"

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

The SP3485EN-L is a 3.3V low-power half-duplex RS-485\/RS-422 transceiver from MaxLinear with 10Mbps data rate, driver\/receiver enables, and 75176-compatible pinout in a SOIC-8 package.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u7535\u6e90\u7535\u538b<\/td>\n3.3V (\u00b15%)<\/td>\n<\/tr>\n
Duplex<\/td>\nHalf-duplex (shared bus)<\/td>\n<\/tr>\n
\u6570\u636e\u901f\u7387<\/td>\n10Mbps max<\/td>\n<\/tr>\n
Driver Differential Output<\/td>\n1.5V min (27\u03a9 load)<\/td>\n<\/tr>\n
Receiver Sensitivity<\/td>\n\u00b1200mV<\/td>\n<\/tr>\n
Receiver Hysteresis<\/td>\n20mV typical<\/td>\n<\/tr>\n
Common-Mode Range<\/td>\n-7V to +12V<\/td>\n<\/tr>\n
Nodes per Bus<\/td>\n32 (unit load)<\/td>\n<\/tr>\n
Driver Propagation Delay<\/td>\n17ns typical, 60ns max<\/td>\n<\/tr>\n
Receiver Propagation Delay<\/td>\n40ns typical, 100ns max<\/td>\n<\/tr>\n
Driver Short-Circuit Current<\/td>\n\u00b1250mA<\/td>\n<\/tr>\n
Supply Current (No Load)<\/td>\n1mA typical (driver enabled)<\/td>\n<\/tr>\n
\u5173\u673a\u7535\u6d41<\/td>\n10\u00b5A typical<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u00b0C to +85\u00b0C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSOIC-8 (5.0 x 4.0mm)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 3.3V single supply operation<\/li>\n
  • Pin-compatible with industry standard 75176<\/li>\n
  • 10Mbps data rate for high-speed communication<\/li>\n
  • Driver and receiver enable pins for direction control<\/li>\n
  • -7V to +12V common-mode input voltage range<\/li>\n
  • Up to 32 transceivers on one bus<\/li>\n
  • Driver output short-circuit protection<\/li>\n
  • Interoperable with 5V logic systems<\/li>\n
  • Failsafe receiver (HIGH output on open inputs)<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Industrial automation RS-485 networks<\/li>\n
    • Building automation (HVAC, lighting)<\/li>\n
    • Smart meters and energy management<\/li>\n
    • Security and access control systems<\/li>\n
    • Embedded system communication links<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The SP3485EN-L is a 3.3V low-power half-duplex RS-485\/RS-422 transceiver from MaxLinear with 10Mbps data rate, driver\/receiver enables, and 75176-compatible pinout in a SOIC-8 package. Key Specifications Supply Voltage 3.3V (\u00b15%) Duplex Half-duplex (shared bus) Data Rate 10Mbps max Driver Differential Output 1.5V min (27\u03a9 load) Receiver Sensitivity \u00b1200mV Receiver Hysteresis 20mV typical Common-Mode […]<\/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":[171],"class_list":["post-7884","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-maxlinear"],"acf":{"brief_explanation":"3.3V half-duplex RS-485, 10Mbps, 75176 pinout, 32 nodes, SOIC-8","date_code":"","package_case":"SOIC-8 (5.0 x 4.0 x 1.55mm, 1.27mm pitch)","in_stock":8500,"datasheet":"https:\/\/www.maxlinear.com\/product\/interface\/serial-transceivers\/rs-485-rs-422\/sp3485","price":"$0.62 @ 1ku","product_introduction":"The SP3485EN-L from MaxLinear (formerly Exar\/Sipex) is a 3.3V low-power half-duplex RS-485\/RS-422 transceiver with a 10Mbps data rate. It is pin-compatible with the industry-standard 75176 transceiver, allowing direct replacement in existing designs. The BiCMOS process provides low power consumption without sacrificing performance. The driver outputs meet RS-485 specifications with a minimum 1.5V differential output across a 27\u03a9 load. The receiver features \u00b1200mV sensitivity with 20mV hysteresis for noise rejection, and a failsafe feature that guarantees a HIGH output when the inputs are open. The -7V to +12V common-mode range handles ground potential differences between systems. Up to 32 transceivers can share one bus. The EN-L suffix denotes the extended temperature range (-40\u00b0C to +85\u00b0C) in SOIC-8 package.","working_principle":"The SP3485EN-L operates as a half-duplex RS-485 transceiver where the driver and receiver share the same bus lines (A and B). In transmit mode, the driver enable (DE) is set high, and the receiver enable (RE) is set high (disabled). The driver takes the DI (data input) logic level and drives the A and B outputs as a differential pair: DI high drives A high and B low (positive VOD), DI low drives A low and B high (negative VOD). The differential output voltage is at least 1.5V across a 27\u03a9 load, meeting the RS-485 specification. The driver is protected by current limiting to \u00b1250mA for short-circuit conditions across the -7V to +12V common-mode range. In receive mode, DE is set low (driver outputs high-impedance) and RE is set low (receiver enabled). The receiver monitors the A-B differential voltage: when A-B exceeds +200mV, RO (receiver output) goes high; when A-B drops below -200mV, RO goes low. The 20mV hysteresis prevents output oscillation near the threshold in noisy environments. When the bus is idle (A-B between -200mV and +200mV, or inputs open), the failsafe circuit ensures RO is high. The device is pin-compatible with the 75176: pin 1=RO, pin 2=RE, pin 3=DE, pin 4=DI, pin 5=GND, pin 6=A, pin 7=B, pin 8=VCC.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>RO<\/td>Output<\/td>Receiver data output<\/td><\/tr>\n
      2<\/td>RE<\/td>Input<\/td>Receiver enable (active low)<\/td><\/tr>\n
      3<\/td>DE<\/td>Input<\/td>Driver enable (active high)<\/td><\/tr>\n
      4<\/td>DI<\/td>Input<\/td>Driver data input<\/td><\/tr>\n
      5<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>\n
      6<\/td>A<\/td>I\/O<\/td>Non-inverting driver output \/ receiver input<\/td><\/tr>\n
      7<\/td>B<\/td>I\/O<\/td>Inverting driver output \/ receiver input<\/td><\/tr>\n
      8<\/td>VCC<\/td>Power<\/td>Supply (3.3V \u00b15%)<\/td><\/tr>\n<\/table>\n

      SP3485EN-L uses the 8-SOIC (N) surface-mount package from MaxLinear\/Sipex: Pin 1 = RO (Receiver Output), Pin 2 = RE (Receiver Enable, active-low), Pin 3 = DE (Driver Enable, active-high), Pin 4 = DI (Driver Input), Pin 5 = GND, Pin 6 = A (non-inverting bus), Pin 7 = B (inverting bus), Pin 8 = VCC (3.0-3.6V). This is the industry-standard RS-485 transceiver pinout shared by SP3485, SN75176, MAX3485, and similar half-duplex devices. For auto-direction control, tie RE and DE together \u2014 when DI is idle HIGH, the driver is enabled for transmit; when the controller releases DI, the bus returns to receive mode. The -L suffix denotes lead-free RoHS compliance. For 5V operation, use SP485 (identical pinout, 5V supply).<\/p>","application_scenarios":"

        \n
      • Industrial Networks:<\/strong> 10Mbps supports high-speed Modbus RTU and Profibus; -7V to +12V CMR tolerates ground loops between factory equipment<\/li>\n
      • Building Automation:<\/strong> 3.3V supply simplifies design with modern MCUs; 32-node capacity covers multi-floor sensor networks<\/li>\n
      • Smart Meters:<\/strong> Low 1mA supply current and 10\u00b5A shutdown extend battery life in remote meter reading nodes<\/li>\n
      • Legacy Upgrade:<\/strong> 75176 pin-compatible allows drop-in replacement of 5V transceivers with 3.3V systems<\/li>\n
      • Failsafe Operation:<\/strong> Open-bus failsafe (RO=HIGH) prevents garbage data during bus disconnection or cable faults<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Specs<\/th><\/tr>\n
        SP3485CN-L<\/td>MaxLinear<\/td>Commercial temp (0\u00b0C to +70\u00b0C) version<\/td>-<\/td>-<\/td><\/tr>\n
        SP481EN-L<\/td>MaxLinear<\/td>Reduced slew rate (250kbps), lower EMI<\/td>-<\/td>-<\/td><\/tr>\n
        SP3481EN-L<\/td>MaxLinear<\/td>With shutdown mode, lower standby power<\/td>-<\/td>-<\/td><\/tr>\n
        SN65HVD75DR<\/td>TI<\/td>3.3V, 12Mbps, \u00b116kV IEC ESD, SOIC-8<\/td>-<\/td>-<\/td><\/tr>\n
        MAX3485ECSA+<\/td>ADI\/Maxim<\/td>3.3V, 12Mbps, \u00b115kV ESD, SOIC-8<\/td>-<\/td>-<\/td><\/tr>\n<\/table>\n

        SP3485EN-L is a 3.3V 10Mbps RS-485 transceiver from MaxLinear in SOIC-8. The SP3481 provides full-duplex operation. The SP3491 offers 3.3V full-duplex with 10Mbps. The SN65HVD485EDR from TI provides 3.3V RS-485 in SOIC-8 with 16Mbps. The MAX3485ECSA+ from ADI\/Maxim offers 3.3V 10Mbps with ESD protection. The THVD1500 from TI provides 3.3V RS-485 with 500kbps for long cable runs. For 5V operation, SP485 offers identical pinout at 5V supply.<\/p>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7884","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=7884"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7884\/revisions"}],"predecessor-version":[{"id":8259,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7884\/revisions\/8259"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=7884"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=7884"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=7884"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=7884"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}