SP3485EN-L/TR - 3.3V 10Mbps RS-485 Transceiver | MaxLinear
MPN： SP3485EN-L/TR ✓ 啟用中SP3485EN-L/TR 概覽
An RS-485 transceiver is an interface IC that converts between differential digital signals and a logic-level UART or controller interface. RS-485 uses balanced differential signaling to improve noise immunity and allow communication over longer cable runs than single-ended logic. The SP3485 belongs to the broader serial-interface hierarchy: transceiver -> differential line driver and receiver -> communications IC -> semiconductor.
Key features include compatibility with both RS-422 and RS-485 protocols, half-duplex operation, a 10 Mbps maximum data rate, and operation from a 3.3 V supply. The SP3485 family is also identified as pin-to-pin compatible with Exar SP481, SP483 and SP485 devices and popular industry standards. Its 8-SOIC format supports conventional surface-mount assembly and compact board layouts.
The BiCMOS architecture combines bipolar and CMOS characteristics, supporting low power while maintaining high communication speed. Because the transceiver is half-duplex, the driver and receiver share the bus connection and direction is controlled by an external logic signal. The system designer must manage enable, bus idle state and turnaround timing to avoid contention.
Typical uses include industrial automation equipment, building-control systems, instrumentation, data acquisition, motor-control interfaces and embedded serial bridges. The 3.3 V supply is well suited to modern controller platforms, while the differential bus can improve robustness in electrically noisy environments when implemented with proper cabling, termination and grounding.
For PCB design, place the transceiver close to the bus connector and route differential pairs as a tightly coupled pair. Termination and bias resistors should be located where they can be configured or removed for the system topology. Decoupling should be placed close to the supply pins, and ESD protection should be selected to suit the connector environment.
This product page consolidates verified distributor information, manufacturer family data and cross-reference findings. It distinguishes true pin-compatible alternatives from broader functional equivalents so engineers can shortlist parts without overlooking footprint, voltage or data-rate differences.
直接替換替代品，適用於 SP3485EN-L/TR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： SP3485EN-L/TR （相同外形與佔位） — 差異在於 Package, Product Type, Data Rate, RoHS Status, Duplex.
SP3485EN-L
✅ 直接替換聯絡詢價
查看資料表 →SP3485CN-L
✅ 直接替換聯絡詢價
查看資料表 →SP3485CN-L/TR
✅ 直接替換聯絡詢價
查看資料表 →SP481
✅ 直接替換📋 參考替代品（不在目錄中）
SP483
✅ 直接替換📋 參考替代品（不在目錄中）
SP3485EN-L/TR 規格
| Product Type | RS-422/RS-485 half-duplex transceiver |
| 供應電壓 | 3.3 V |
| Maximum Data Rate | 10 Mbps |
| Driver Count | 1 driver |
| Receiver Count | 1 receiver |
| Duplex Mode | Half-duplex |
| Supported Protocols | RS-422 and RS-485 |
| Process Technology | BiCMOS |
| 封裝 | 8-pin SOIC |
| 安裝類型 | Surface mount |
| Compatibility | Pin-to-pin compatible with Exar SP481, SP483 and SP485 devices |
| Power Class | Low-power operation |
| Bus Signaling | Differential RS-422/RS-485 |
| DigiKey Availability Statement | Buy now, ships today |
| LCSC Listed Quantity | 187,140 units |
| LCSC Listed Price | From $0.1358 |
| eBee Listed Price | From $0.2813 |
| RoHS 狀態 | RoHS-compliant information found in comparison data |
SP3485EN-L/TR 8-pin soic 腳位配置指南
SP3485EN-L/TR（8-pin soic 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： SP3485EN-L/TR.
請參閱 資料表 以查看完整腳位配置。
典型應用
SP3485EN-L/TR 適用於 6 應用s: Industrial Automation Serial Links, Building Control and HVAC Networks, Data Acquisition and Instrumentation, Embedded UART-to-RS485 Bridges, Motor and Equipment Control Interfaces, Low-Power Sensor and Gateway Boards.
Industrial Automation Serial Links
The SP3485EN-L/TR fits industrial automation modules that need a compact 3.3 V differential serial interface between a controller and remote equipment. Its half-duplex architecture reduces the number of bus conductors, while the 10 Mbps capability provides substantial rate headroom for short factory-floor links. Place the transceiver near the connector, route the differential pair as a controlled impedance-aware path and provide termination appropriate to the cable length and topology. The design should also account for direction turnaround, idle-bus biasing and connector-side ESD protection because those external details determine reliable operation more than the nominal IC speed alone.
推薦
Building Control and HVAC Networks
The SP3485EN-L/TR can connect a 3.3 V embedded controller to differential building-control equipment where RS-485 or RS-422-style balanced signaling is used over a longer cable than ordinary logic wiring. Its 10 Mbps rating is more than sufficient for many control and telemetry rates, allowing designers to retain margin for protocol overhead and future traffic. Keep the transceiver and bus protection close to the field connector, separate noisy switching paths from the differential pair, and verify grounding and common-mode behavior in the installed system. Direction control must be configured so the driver is disabled whenever the bus is being received.
推薦
Data Acquisition and Instrumentation
Use the SP3485EN-L/TR as the physical-layer interface between a modern 3.3 V data-acquisition controller and external sensors or laboratory equipment. The differential bus can improve noise immunity compared with single-ended communication, and the 10 Mbps capability allows a high-bandwidth control path or aggregated measurement traffic when the remote device supports it. Place termination and optional bias networks at deliberate locations, use a low-noise supply path and keep the bus return properly referenced. Verify cable length, baud rate and isolation requirements experimentally because the supplied data does not specify a maximum bus length or guaranteed isolation voltage.
推薦
Embedded UART-to-RS485 Bridges
The SP3485EN-L/TR is well suited to compact embedded boards that expose a UART through a robust differential port. Its 3.3 V operation aligns with many microcontrollers and communication SoCs, while the single driver and receiver support a shared half-duplex bus. The firmware must deassert transmit before switching to receive and avoid bus contention during startup or reset. Hardware should include local decoupling, an optional direction-control pull-down, user-selectable termination and a protected connector path. The 8-SOIC footprint simplifies assembly but still requires careful grounding to prevent common-mode noise from entering the controller.
推薦
Motor and Equipment Control Interfaces
The SP3485EN-L/TR can provide the differential communication path between a controller and motor or industrial equipment interface that accepts RS-485/RS-422 signaling. The 3.3 V supply is suitable for compact control electronics, and the 10 Mbps rating supports high-speed command and status traffic where the connected equipment defines an appropriate protocol. Keep the transceiver away from high-dv/dt switching stages, use a defined chassis or signal ground strategy, and place protection components at the connector boundary. Isolation and fail-safe behavior are system-level concerns; the supplied information does not establish them, so validate them against the actual motor-drive environment.
推薦
Low-Power Sensor and Gateway Boards
The SP3485EN-L/TR is useful in small sensor gateways and remote I/O boards that need a wired differential link without adding a high-power interface. Its low-power 3.3 V operation and 8-SOIC package suit compact boards, while the 10 Mbps capability allows the link to carry telemetry and configuration traffic beyond low-speed sensor polling. The designer should estimate average bus activity because power use depends on transmit time, receive state and external biasing. Add a controlled direction signal, maintain fail-safe idle states and use low-leakage protection devices so an inactive transceiver does not unnecessarily load the bus.
推薦
推薦產品摘要
工程參考資料，適用於 SP3485EN-L/TR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | SP3485EN-L | SP3485CN-L | SP481 | SP483 | SP485 |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | SOIC-8 | 8-SOIC family package; exact suffix not supplied | 8-SOIC family package; exact suffix not supplied | 8-SOIC family package; exact suffix not supplied |
| Brand | MaxLinear | MaxLinear | MaxLinear | MaxLinear | MaxLinear | MaxLinear |
| Protocol Support | RS-422 and RS-485 | RS-422 and RS-485 family device | RS-422/RS-485 family device | SP3485-compatible family device; exact protocol details not supplied | SP3485-compatible family device; exact protocol details not supplied | SP3485-compatible family device; exact protocol details not supplied |
主要差異化特點
- 10 Mbps communication capability (對比SN75176BD)
- 3.3 V low-power family positioning (對比SP3485EN-L)
- Pin-to-pin family compatibility (對比SP485)
設計說明
Route the differential bus as a closely coupled pair with continuous reference over the connector and transceiver. Keep the pair away from switching power nodes, clocks and high-current motor wiring. Place any termination components at the physical ends of the bus, and use only the resistor values and bias arrangement supported by the final topology and cable length. Validate signal quality with an oscilloscope at the intended baud rate because the 10 Mbps IC specification does not by itself guarantee margin for every cable or connector implementation.
Do not assume that every 3.3 V RS-485 transceiver is pin-to-pin compatible. Direction control, driver enable polarity, receiver output behavior, fail-safe biasing, ESD rating and supply limits must be checked against the existing PCB. The SP3485 family is described as compatible with SP481, SP483 and SP485 devices, but the exact alternate MPN and suffix still require manufacturer cross-reference confirmation before production substitution.
Place the transceiver close to the bus connector and place decoupling capacitors close to its supply pins. Keep the logic-side UART traces away from the differential pair where practical, and provide a defined ground return. If the board supports field-bus protection, locate TVS and common-mode-choke components at the connector boundary rather than beside the IC. Check the assembled footprint's pin numbering and exposed or no-connect details against the manufacturer datasheet before release.
合規資訊
The supplied comparison data describes the SP3485 family as RoHS-compliant. No verified REACH, lead-free, halogen-free, conflict-minerals or AEC-Q100 qualification statement was supplied.