SP485REN-L/TR - 5V RS-485/RS-422 Transceiver | MaxLinear
MPN: SP485REN-L/TR ✓ Hoạt độngSP485REN-L/TR Tóm tắt
An RS-485 transceiver is an interface IC that converts logic-level digital signals into balanced differential signals for reliable communication over longer, potentially noisy industrial buses. It belongs to the RS-485 and RS-422 transceiver category, within interface ICs and the broader semiconductor hierarchy. The SP485REN-L/TR is intended for systems that need standardized differential signaling, bus arbitration behavior, and a compact surface-mount implementation.
Key features include support for both RS-485 and RS-422 operation, a maximum signaling rate of 5 Mbps, operation from a single 4.75 V to 5.25 V supply, and a high-impedance receiver arrangement identified by the REN designation. MaxLinear describes the SP485 and SP483 families as BiCMOS products designed to reduce power consumption without sacrificing performance. The industrial-temperature option and lead-free SOIC-8 package suit compact industrial control, instrumentation, and communications equipment.
The REN variant provides higher receiver input impedance than the standard SP485 arrangement. A comparative manufacturer-family listing identifies the SP485REN-L as suitable for connecting more than 400 transceivers on one transmission line without degrading the RS-485 driver signal. This characteristic is useful in large multi-drop installations where many receiver nodes share a common bus, although cable length, topology, termination, and transceiver loading must still be evaluated together.
Typical applications include industrial sensor networks, factory automation equipment, building-control interfaces, process instrumentation, and RS-485-to-serial bridges. At high data rates, cable type, connector transitions, grounding, and electromagnetic compatibility become increasingly important. At lower rates, longer cable runs may be practical, subject to the propagation delay and differential resistance limits of the selected cable and network topology.
Designers should use the pin-description table and typical application circuit in the manufacturer datasheet when assigning PCB traces. Place the transceiver close to the bus connector, provide a solid ground reference, route the differential pair as a balanced pair, and avoid adding unnecessary stubs. Power-supply decoupling should be placed near the device, while external protection should be selected for the cable length, installation environment, and required surge withstand.
This page organizes the confirmed electrical, package, application, and sourcing information for SP485REN-L/TR and adds practical guidance for bus layout, protection, compliance review, and drop-in replacement assessment. It distinguishes documented pin-compatible options from functionally similar devices that may require design verification before substitution.
Bộ thay thế dễ dàng lắp đặt cho SP485REN-L/TR — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với SP485REN-L/TR (cùng hình factor và footprint) — khác nhau ở Package, Product Type, Operating Temperature Range, RoHS Status, Supply Voltage Range.
SP485EN-L/TR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →SP485EMN-L/TR
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →SP485CN-L/TR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SP485REN-L/TR Thông số kỹ thuật
| Product Type | Half-duplex differential bus transceiver |
| Supported Standards | RS-422 and RS-485 |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Nominal Supply Voltage | 5 V |
| Maximum Data Rate | 5 Mbps |
| Target Unit Load | 1/1 unit load |
| Receiver Input Impedance | High-impedance REN configuration |
| Maximum Transceivers per Bus | More than 400 transceivers |
| Process Technology | BiCMOS |
| Hộp | 8-pin SOIC, R-PDSO-G8 |
| Package Width | 3.9 mm |
| Package Length | 4.9 mm |
| Terminal Count | 8 terminals |
| Kiểu lắp đặt | Surface mount |
| Lead-Free Construction | Yes |
| Operating Temperature Class | Industrial temperature |
Hướng dẫn cấu hình chân SP485REN-L/TR 4.9 mm
Cấu hình chân cho SP485REN-L/TR (4.9 mm gói). Số thứ tự chân, chức năng và sơ đồ kết nối được xác định trong tài liệu thông số kỹ thuật của nhà sản xuất. Tham khảo nó để biết footprint và hướng dẫn hàn chính xác.
Không có dữ liệu chân cụ thể sẵn có cho SP485REN-L/TR.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
SP485REN-L/TR phù hợp cho 6 Áp dụngs: Industrial Sensor Networking, Factory Automation Equipment, Building Control and HVAC Networks, Process Instrumentation, Remote Data Acquisition, RS-485 to Serial Bridges.
Industrial Sensor Networking
The SP485REN-L/TR fits industrial sensor networks that distribute measurements from many field nodes over a shared 5 V RS-485 bus. Its 1/1-unit-load rating, high-impedance REN configuration, and support for more than 400 transceivers on one transmission line make it useful where numerous receivers must coexist without unnecessarily loading the bus driver. The 5 Mbps maximum rate also supports higher-speed factory data links, although actual distance must be reduced as the rate increases. Engineers should use twisted-pair cabling, a continuous ground reference, controlled termination, and surge protection appropriate to the plant installation.
Factory Automation Equipment
The SP485REN-L/TR can connect a controller, programmable logic device, or embedded system to remote actuators over an RS-485 fieldbus. Its half-duplex architecture limits the bus to one active driver at a time, which is well suited to token-passing or request-response industrial protocols. The single 4.75 V to 5.25 V operating range integrates readily with 5 V logic, while the compact 8-pin SOIC package simplifies high-density control boards. Validate driver enable timing and bus turnaround delay in the system firmware, and route the differential pair away from motor power and switching-node traces.
Building Control and HVAC Networks
SP485REN-L/TR is suitable for building-control equipment that links room controllers, sensors, dampers, and monitoring units through an RS-485 network. The high-impedance receiver characteristic is valuable when multiple low-cost nodes share the same cable, while operation from 4.75 V to 5.25 V supports conventional embedded control rails. Industrial-temperature operation and a surface-mount SOIC package help satisfy compact equipment requirements. In building environments, use twisted pair with a low-capacitance design, bond the signal reference to protective earth where appropriate, and place protection close to the external connector.
Process Instrumentation
The SP485REN-L/TR provides a differential physical layer for process instruments communicating with a supervisory controller over RS-485. Differential signaling improves noise immunity in installations containing motor drives, contactors, and switching power supplies, while the transceiver's 5 Mbps capability provides margin for moderate-speed acquisition systems. The REN configuration supports a high population of listening nodes without requiring a separate receiver for every sensor. Ensure the bus has only one enabled driver at a time, observe the specified driver-enable timing, and verify cable length against the selected signaling rate and protocol.
Remote Data Acquisition
The SP485REN-L/TR is well suited to remote acquisition links that collect measurements from distributed modules and forward them over an RS-485 segment. Its 8-pin SOIC package leaves board area for signal conditioning, isolation, or protection circuitry, and its differential driver and receiver support robust communication in electrically noisy environments. The high-impedance REN configuration can accommodate many receiver-only acquisition modules on one bus. For installations exposed to large transients, add appropriately rated surge and ESD protection and confirm that the transceiver ground is referenced correctly to the protected signal ground.
RS-485 to Serial Bridges
The SP485REN-L/TR can provide the physical-layer side of a compact RS-485-to-serial bridge when the host processor handles framing, addressing, and protocol conversion. Half-duplex operation supports economical two-wire wiring, with the firmware coordinating transmit and receive intervals through the driver-enable function. Its 5 Mbps capability allows transparent bridging at high enough rates for many data-transfer tasks, while the industrial-temperature classification supports equipment deployed outside tightly controlled environments. Firmware must prevent bus contention, and the PCB should keep the transceiver close to the connector to minimize unprotected trace length.
Dữ liệu tham khảo kỹ thuật cho SP485REN-L/TR — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | SP485EN-L/TR | SP485EMN-L/TR | SP485CN-L/TR |
|---|---|---|---|---|
| Package | 8-pin SOIC, R-PDSO-G8 | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Brand | MaxLinear | MaxLinear | MaxLinear | MaxLinear |
| Product Type | Half-duplex RS-485/RS-422 transceiver | Half-duplex RS-485/RS-422 transceiver | Half-duplex RS-485/RS-422 transceiver | Half-duplex RS-485/RS-422 transceiver |
Bảo phân biệt quan trọng
- High-impedance receiver configuration for large multi-drop buses (vsSP485EN-L/TR)
- Established SP485-family 5 Mbps performance (vsSP485EMN-L/TR)
- 1/1-unit-load industrial interface in an 8-pin SOIC (vsSP485CN-L/TR)
Ghi chú thiết kế
Place the SP485REN-L/TR close to the external bus connector and route the A and B conductors as a tightly coupled differential pair over a continuous ground plane. Keep the protected transceiver side of any surge or ESD component separated from the connector as much as practical. Avoid stubs, test pads, and branch traces on the main bus because each added branch changes the transmission-line loading and can degrade signal integrity at higher data rates.
Do not enable more than one driver on the same RS-485 segment at the same time. The SP485REN-L/TR is a half-duplex transceiver, so firmware must coordinate transmit and receive states and allow the bus to settle before interpreting a response. The REN designation provides high receiver input impedance, but it does not remove the need for correct unit-load calculations, termination, topology, and cable-length validation.
Decouple the 5 V supply locally at the transceiver and use a quiet source for logic-level signals sharing the board. The documented operating range is 4.75 V to 5.25 V, so verify the actual rail remains within that interval under load. Place the supply capacitor adjacent to the device power pin and connect the transceiver ground directly to the signal reference ground rather than routing it through a narrow or shared path.
Use twisted-pair cable with a consistent reference-ground strategy, especially when the bus crosses between buildings, machines, or large cabinets. At the maximum 5 Mbps signaling rate, cable loss, connector transitions, reflections, and common-mode noise become increasingly important. Apply termination only where required by the bus topology and evaluate it together with the receiver's input impedance rather than adding it unconditionally.
Thông tin tuân thủ
The datasheet listing identifies the package as lead-free, but no explicit RoHS, REACH, AEC-Q100, halogen-free, or conflict-minerals declarations were confirmed.
