SP485RCN-L - 1/10-Unit-Load RS-485 Transceiver | MaxLinear
MPN: SP485RCN-L ✓ نشطSP485RCN-L نظرة عامة
An RS-485 transceiver is a physical-layer interface IC that combines a differential line driver and receiver on a balanced two-wire bus. The SP485 family supports RS-485 and RS-422 operation, while the SP485R high-fanout version raises receiver input impedance and can accommodate more than 400 transceivers on one transmission line without materially degrading the driver signal.
The SP485RCN-L offers several practical benefits for industrial communication equipment. Its 1/10-unit-load receiver allows many devices to share the same bus without requiring a separate termination for every node. High receiver input impedance reduces loading in multi-drop networks, while the 5 Mbps maximum data rate supports both legacy industrial baud rates and faster point-to-point links.
The SP485R architecture is described by the manufacturer as pin-to-pin equivalent to the original SP485 while adding high receiver input impedance and enhanced ESD tolerance. This makes it suitable for designs migrating from a conventional SP485 footprint when fan-out or transient robustness is important. The half-duplex arrangement allows the same differential pair to support transmission and reception, although direction control must be managed by the host logic.
Typical applications include industrial PLC and factory automation links, building-control networks, instrumentation buses, motor-control equipment, security systems, and communications equipment that must place multiple transceivers on a single RS-485 segment. The 8-pin narrow SOIC package also supports compact board layouts where a higher-density interface solution would otherwise consume unnecessary area.
Designers should use the manufacturer pin-description table when assigning PCB tracks, place the transceiver close to the connector, and apply suitable protection to the external bus. Termination, biasing, common-mode range, and isolation requirements must be evaluated together because the transceiver itself does not remove the need for correct bus topology and surge protection.
This product data combines the SP485 family architecture, package information, manufacturer guidance, and drop-in comparison guidance to support faster schematic review, PCB-footprint validation, and sourcing decisions for industrial RS-485 and RS-422 interfaces.
بدائل مباشرة لـ SP485RCN-L — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع SP485RCN-L (نفس عامل الشكل والبصمة) — يختلف في Package, Product Type, Mounting Type, Maximum Data Rate, Operating Temperature Range.
SP485EMN-L/TR
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←SP485REP-L
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←SP485EEN-L/TR
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ST485EBDR
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
ST485ECDR
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
SP485RCN-L المواصفات
| Product Type | Half-duplex RS-485/RS-422 transceiver |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Maximum Data Rate | 5 Mbps |
| Receiver Unit Load | 1/10 unit load |
| Receiver Input Impedance | High; more than 400 transceivers supported per transmission line |
| Driver and Receiver Configuration | Half-duplex |
| Supported Standards | RS-485 and RS-422 |
| Process Technology | BiCMOS |
| ESD Tolerance | Enhanced versus the original SP485; exact rating not stated |
| العلبة | 8-pin narrow SOIC |
| نوع التركيب | Surface mount |
| Maximum Bus Node Count | More than 400 transceivers |
تكوين أطراف SP485RCN-L
| دبوس 1 | RO — Receiver output |
| دبوس 2 | /RE — Receiver enable, active low |
| دبوس 3 | DE — Driver enable |
| دبوس 4 | DI — Driver data input |
| دبوس 5 | GND — Ground |
| دبوس 6 | Y — Non-inverting driver output and receiver input |
| دبوس 7 | Z — Inverting driver output and receiver input |
| دبوس 8 | VCC — Supply voltage |
التطبيقات النموذجية
SP485RCN-L مناسب لـ 6 التطبيقs: Industrial PLC and Factory Automation Buses, Building Control and HVAC Networks, Security and Access-Control Systems, Instrumentation and Sensor Networks, Motor Drives and Machinery Control, Telecommunications and Remote Equipment.
Industrial PLC and Factory Automation Buses
The SP485RCN-L fits industrial automation networks that distribute commands and sensor readings across multiple controller modules. Its 1/10-unit-load receiver and high input impedance reduce the loading created by numerous transceiver nodes, while the manufacturer describes support for more than 400 devices on one transmission line. The half-duplex arrangement preserves the shared A and B conductors used by common factory bus topologies, and the enhanced ESD tolerance of the SP485R family adds useful protection margin where field wiring enters a control cabinet.
موصى به
Building Control and HVAC Networks
The SP485RCN-L is appropriate for building-control equipment that links HVAC controllers, room sensors, actuators, and supervisory controllers over a balanced RS-485 network. High receiver input impedance helps when many low-power nodes share the same cable, and the 1/10-unit-load characteristic supports dense bus arrangements. Its 4.75 V to 5.25 V operating range fits regulated 5 V controller electronics. The enhanced ESD tolerance is particularly useful for building controllers connected to long in-wall or field cables.
موصى به
Security and Access-Control Systems
The SP485RCN-L can connect access-control readers, door controllers, intercoms, and alarm panels in security installations that use a half-duplex RS-485 backbone. The high-fanout receiver characteristic allows numerous low-power field nodes to share one cable without excessive bus loading. Data rates up to 5 Mbps provide ample margin for common control traffic. Because readers and panels may connect to external cabling, the SP485R family’s enhanced ESD tolerance is a useful attribute, although coordinated surge protection is still required.
موصى به
Instrumentation and Sensor Networks
The SP485RCN-L is useful for instrumentation systems that collect measurements from distributed sensors, transmitters, laboratory equipment, or process monitors. The 1/10-unit-load receiver minimizes the effective load presented by each node, allowing more instruments to share a differential pair. A maximum rate of 5 Mbps supports high-speed laboratory links as well as slower industrial measurement buses. The combination of high receiver impedance, enhanced ESD tolerance, and an 8-pin narrow SOIC package supports compact multi-channel measurement equipment.
موصى به
Motor Drives and Machinery Control
The SP485RCN-L can serve as the command bus between a machinery controller, motor-drive modules, remote I/O blocks, and diagnostic equipment. Half-duplex communication suits the shared differential conductors commonly used between drive modules, while the 1/10-unit-load receiver helps preserve signal integrity in multi-drive installations. The 5 Mbps capability is more than sufficient for status and command traffic in many drive systems. Because motor environments can expose transients, the enhanced ESD capability should be supplemented with correctly selected surge protection.
موصى به
Telecommunications and Remote Equipment
The SP485RCN-L is suitable for remote-unit and telecommunications equipment that uses point-to-point or lightly loaded RS-485 links for configuration, monitoring, and alarm information. Its 5 Mbps maximum data rate supports high-speed control traffic, while the half-duplex driver and receiver share the same physical bus. The 8-pin narrow SOIC footprint simplifies compact interface sections, and enhanced ESD tolerance offers additional resilience when the transceiver is located near an external communications connector.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ SP485RCN-L — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
Choose SP485EMN-L/TR or SP485REP-L when a same-manufacturer ordering option provides a closer match for the required protection rating, exact electrical limits, or supply range. Review their individual datasheets rather than assuming that all SP485 suffix codes are interchangeable. Choose SP485EEN-L/TR when its documented configuration better matches the design and the SOIC-8 footprint remains unchanged.
The ST485EBDR and ST485ECDR are reasonable cross-brand candidates for conventional half-duplex SOIC-8 RS-485 designs. They should be selected only after confirming unit load, receiver impedance, ESD immunity, common-mode range, enable logic, and bus-fail-safe behavior. In every case, verify the exact pinout, termination strategy, protection network, and cable topology before approving a drop-in substitution.
المقارنة مع البدائل
| المعامل | هذا المنتج | SP485EMN-L/TR | SP485REP-L | SP485EEN-L/TR | ST485EBDR | ST485ECDR |
|---|---|---|---|---|---|---|
| Package | 8-pin narrow SOIC | 8-pin narrow SOIC | 8-pin narrow SOIC | 8-pin narrow SOIC | 8-pin narrow SOIC | 8-pin narrow SOIC |
| Brand | MaxLinear, Inc. | MaxLinear, Inc. | MaxLinear, Inc. | MaxLinear, Inc. | STMicroelectronics | STMicroelectronics |
| Supported Interfaces | RS-485 and RS-422 | RS-485 family transceiver | RS-485 family transceiver | RS-485 family transceiver | RS-485 transceiver | RS-485 transceiver |
| Duplex Mode | Half-duplex | Half-duplex family implementation | Half-duplex family implementation | Half-duplex family implementation | Half-duplex RS-485 implementation | Half-duplex RS-485 implementation |
| Supply Voltage Range | 4.75 V to 5.25 V | Not stated in cited record | Not stated in cited record | Not stated in cited record | Not stated in cited record | Not stated in cited record |
| Maximum Data Rate | 5 Mbps | Not stated in cited record | Not stated in cited record | Not stated in cited record | Not stated in cited record | Not stated in cited record |
| Receiver Unit Load | 1/10 unit load | Not stated in cited record | Not stated in cited record | Not stated in cited record | Not stated in cited record | Not stated in cited record |
| Receiver Input Impedance | High impedance; supports more than 400 transceivers per line | Not stated in cited record | Not stated in cited record | Not stated in cited record | Not stated in cited record | Not stated in cited record |
| ESD Capability | Enhanced versus the original SP485 | Not stated in cited record | Not stated in cited record | Not stated in cited record | Not stated in cited record | Not stated in cited record |
| Process Technology | BiCMOS | SP485 family BiCMOS implementation | SP485 family BiCMOS implementation | SP485 family BiCMOS implementation | Not stated in cited record | Not stated in cited record |
أبرز الفروقات
- High-fanout receiver architecture (مقابلST485EBDR)
- Enhanced ESD tolerance relative to the original SP485 (مقابلSP485EMN-L/TR)
- Established 5 Mbps RS-485 and RS-422 capability (مقابلST485ECDR)
- High receiver impedance preserves driver signal in dense networks (مقابلSP485REP-L)
ملاحظات التصميم
Place the SP485RCN-L close to the external bus connector and keep the differential route from RO and DI to the connector short and compact. Route the Y and Z conductors as a balanced pair with consistent ground reference, avoid stubs, and keep protection-device capacitance out of high-speed signal paths. Confirm the final pin assignment against the manufacturer datasheet before releasing the PCB.
Do not treat every SOIC-8 RS-485 transceiver as an automatic replacement. The SP485RCN-L is distinguished by a 1/10-unit-load receiver, high receiver impedance, and enhanced ESD tolerance relative to the original SP485. Before substituting a candidate, verify the driver and receiver enable polarity, fail-safe behavior, supply range, common-mode limits, bus loading, and protection ratings against the system requirements.
Use termination only where required by the cable topology, normally at the two ends of the main bus segment rather than at every node. Add biasing only after checking whether another node or an external network already establishes the idle state. For long industrial cables, use twisted-pair wiring, a continuous reference ground where permitted, and coordinated surge protection rated for the installation environment.
Manage DE and /RE correctly because the SP485RCN-L is half-duplex. The controller should avoid leaving the driver enabled while receivers listen, since multiple drivers can conflict on the shared bus. Validate turnaround timing in firmware and use the transceiver’s maximum 5 Mbps figure as a device limit rather than assuming every cable and topology can operate at that rate.
Follow the manufacturer’s recommended supply decoupling and place it directly between the VCC and GND pins. Keep the return-current path short and use a low-impedance ground plane. Because the stated operating range is 4.75 V to 5.25 V, confirm rail tolerance, startup behavior, and any 3.3 V system interface requirements before assigning logic-level compatibility to the digital control pins.
معلومات الامتثال
The manufacturer family page and distributor listings do not state the requested compliance results. Enhanced ESD tolerance is a device capability and does not by itself establish RoHS, REACH, AEC-Q100, or halogen-free status.