SP485CN-L - 5Mbps Half-Duplex RS-485 IC | MaxLinear
MPN： SP485CN-L ✓ 啟用中SP485CN-L 概覽
An RS-485 transceiver is an interface IC that converts logic-level transmit and receive signals into differential bus signals. The SP485CN-L supports both RS-422 and RS-485 protocols, making it suitable for industrial communication, building controls, instrumentation, and embedded systems that require robust differential signaling. Its half-duplex arrangement shares one pair of bus conductors for transmission and reception, so software or hardware must control the direction between nodes.
Key verified characteristics include one transmitter and one receiver, RS-422/RS-485 operation, a 5 Mbps maximum signaling rate, and a 4.75 V to 5.25 V supply range. The SOIC-8 package is compatible with standard surface-mount assembly, and distributor listings identify the device as an 8-SOIC interface transceiver. Exact driver output current, receiver thresholds, propagation delay, and quiescent current are not supplied in the verified data and must be checked against the manufacturer datasheet before final design release.
The SP485CN-L is suited to high-speed half-duplex links where reduced bus wiring and low power are useful. In factory equipment, it can connect a controller to remote sensors or actuators; in building automation, it can carry control commands between distributed nodes; and in test systems, it can support instrumentation connected through RS-485. The 5 Mbps capability is useful for short, controlled links, while cable length, termination, biasing, topology, and protective devices remain important system-level constraints.
For PCB implementation, preserve the device pin assignments and keep the bus-side differential pair routed as a controlled pair. Termination resistors, bias resistors, common-mode protection, ground strategy, and isolation should be selected from the actual cable, topology, and fault-environment requirements. Do not assume that the package alone guarantees robust communication.
This page combines verified distributor and manufacturer references, drop-in replacement context, application guidance, and practical design notes. It also distinguishes the SP485CN-L from packaging variants and identifies when a candidate requires engineering validation rather than claiming unsupported electrical equivalence.
直接替換替代品，適用於 SP485CN-L — 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： SP485CN-L （相同外形與佔位） — 差異在於 Package, Product Type, Mounting Type, Driver Count, Receiver Count.
MAX485CSA-T
✅ 直接替換📋 參考替代品（不在目錄中）
MAX485CSA+
✅ 直接替換聯絡詢價
查看資料表 →SN75176BD
✅ 直接替換聯絡詢價
查看資料表 →ST485ERBD
✅ 直接替換📋 參考替代品（不在目錄中）
SP485ECN-L
✅ 直接替換聯絡詢價
查看資料表 →SP485CN-L 規格
| Transceiver Type | Single transmitter/single receiver half-duplex transceiver |
| Supported Protocols | RS-422 and RS-485 |
| Maximum Data Rate | 5 Mbps |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Logic and Bus Function | Bidifferential half-duplex serial interface |
| Architecture | BiCMOS |
| Power Class | Low-power operation |
| Driver Count | 1 |
| Receiver Count | 1 |
| 封裝 | 8-pin SOIC |
| 安裝類型 | Surface Mount |
| Temperature Range | 0 C to 70 C |
| Bus Topology | Half-duplex differential bus |
| Signaling | Differential RS-422/RS-485 |
| AEC-Q100 Qualification | not_applicable |
SP485CN-L 8-pin soic 腳位配置指南
SP485CN-L（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： SP485CN-L.
請參閱 資料表 以查看完整腳位配置。
典型應用
SP485CN-L 適用於 6 應用s: Industrial Automation Bus, Building Automation Networks, Remote Sensor Networks, Process and Factory Control, Instrumentation and Test Systems, Data Acquisition Gateways.
Industrial Automation Bus
The SP485CN-L fits a half-duplex controller-to-field-device link when the design uses one differential pair and a direction-control signal. Its verified RS-422/RS-485 capability and 5 Mbps family rating provide a useful starting point for industrial automation equipment, although actual cable length and node count determine whether the target rate is achievable. Termination, fail-safe biasing, grounding, and surge protection must be designed around the field wiring rather than added only after installation. The 0 C to 70 C verified temperature range should also be checked against the enclosure and process environment.
推薦
Building Automation Networks
Use the SP485CN-L as a low-power half-duplex interface in building-control equipment that exchanges commands and status over an RS-485 bus. The 4.75 V to 5.25 V supply range simplifies integration with conventional 5 V control electronics, while the single-driver/single-receiver arrangement suits shared bus wiring. The practical benefit is fewer dedicated communication lines than a point-to-point serial interface, but installers still need consistent baud rate, addressing, termination, and grounding. Environmental transients from long building cables may require external protection and isolation.
推薦
Remote Sensor Networks
The SP485CN-L can connect a controller to remote sensors over a short or medium-length RS-485 segment when half-duplex communication is acceptable. Its verified 5 Mbps capability is useful for sensor backhaul traffic and diagnostic bursts, although lower baud rates may be necessary for long cables or noisy installations. The interface does not replace sensor excitation, signal conditioning, or isolation; those functions must be placed according to the sensor’s electrical requirements. Firmware should manage bus direction and avoid transmitting while multiple nodes are active.
推薦
Process and Factory Control
In factory control equipment, the SP485CN-L provides a compact differential serial interface between a controller and remote actuators or instrumentation. The BiCMOS low-power architecture is attractive when multiple interface channels share a constrained power budget, and the half-duplex topology reduces wiring compared with separate transmit and receive buses. Designers should still calculate cable loss and common-mode margin, specify 120-ohm termination only where appropriate, and add protection for motor, relay, or industrial switching transients. The verified 0 C to 70 C range limits unrestricted use in harsh environments.
推薦
Instrumentation and Test Systems
SP485CN-L is suitable for instrument and test-system interfaces that need a reliable, low-power half-duplex link to distributed measurement modules. The verified 5 Mbps family rating can support fast command or data bursts, while the 8-SOIC package supports compact surface-mount assemblies. A successful design must separate sensitive measurement grounds where appropriate, define a common bus reference, and verify that termination and biasing preserve valid receiver levels over the intended cable and node configuration. Protection should be selected based on the laboratory environment and cable routing.
推薦
Data Acquisition Gateways
The SP485CN-L can act as the field-side interface in a gateway that converts between embedded control electronics and an RS-485 field bus. Its one-driver/one-receiver arrangement is appropriate for a node that participates in a shared half-duplex network, and the low-power architecture supports distributed equipment. The gateway should control transmit direction with deterministic firmware timing, handle bus contention defensively, and expose diagnostics for communication faults. Exact receiver thresholds, propagation delay, and fail-safe behavior must be confirmed from the production datasheet before setting protocol timing limits.
推薦
推薦產品摘要
工程參考資料，適用於 SP485CN-L — 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 | MAX485CSA-T | MAX485CSA+ | SN75176BD | ST485ERBD | SP485ECN-L |
|---|---|---|---|---|---|---|
| Brand | MaxLinear | Maxim Integrated | Maxim Integrated | Texas Instruments | STMicroelectronics | MaxLinear |
| Package | 8-pin SOIC | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 | PDSO-8 |
主要差異化特點
- Verified MaxLinear SP485 family support (對比MAX485CSA-T)
- 5 Mbps family capability (對比SN75176BD)
- Low-power BiCMOS positioning (對比MAX485CSA+)
設計說明
Route the two RS-485 bus conductors as a tightly coupled differential pair and keep the transceiver-side ground reference close to the interface. Place any termination and fail-safe bias components where they can be reached by short, defined traces. Because the verified data does not include the exact pinout or recommended resistor values, use the manufacturer datasheet for placement and values instead of copying a generic RS-485 layout.
Do not treat the 5 Mbps family rating as a guarantee for every cable length or topology. Confirm baud rate against cable length, node count, termination, biasing, and environmental noise. Also verify direction-control timing because the SP485CN-L is half-duplex. The verified 0 C to 70 C range and absent detailed transient specifications make it especially important to check the actual operating environment before release.
Use a controlled ground and cable strategy to reduce common-mode noise and radiated emissions. Keep external protection devices close to the connector so surge energy is diverted before reaching the transceiver. Termination should be enabled only according to the selected bus topology; incorrect termination can reduce signal quality or increase load. The supplied data does not establish a specific slew-rate value, so do not claim a specific EMI performance without the manufacturer test data.
合規資訊
The supplied verified data does not provide RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations. AEC-Q100 is recorded as not_applicable because this is an interface transceiver rather than an automotive-qualified device in the supplied data.