SP485RCN-L/TR - 5Mbps RS-485 Transceiver | MaxLinear
N.º da peça: SP485RCN-L/TR ✓ AtivoSP485RCN-L/TR Visão geral
An RS-485 transceiver is a bidirectional communications interface that combines a differential line driver and differential receiver on a single integrated circuit. RS-485 defines a physical layer for robust, multipoint, balanced digital data links, while RS-422 provides a related differential signaling system. These transceivers operate within the interface IC and data-communications hierarchy, converting between logic-level signals and balanced differential signals used by industrial, building, and telecommunications equipment.
The SP485RCN-L/TR combines a 5 V BiCMOS implementation with operation at rates up to 5 Mbps. Key electrical features include a typical receiver input resistance of 150 kohm and support for more than 400 units on a single line. The device is intended for half-duplex communication, uses an 8-pin narrow SOIC package, and is supplied in tape-and-reel packaging. Its operating temperature range is 0 °C to 70 °C.
The BiCMOS architecture combines bipolar and CMOS characteristics to provide low-power operation without sacrificing line-driver performance. Separate receiver and driver control inputs permit the design to select receive, transmit, or disabled operating states. This flexibility is useful when direction control is handled by a microcontroller, transceiver logic, or an automatic control circuit. The high receiver impedance is particularly valuable in large RS-485 networks where loading from many connected receivers could otherwise reduce bus signal amplitude.
Typical uses include industrial RS-485 controllers, building-automation equipment, instrumentation links, motor-control systems, and communications between a host controller and distributed remote nodes. The 5 Mbps capability supports relatively fast short-distance balanced links, while the 1/10-unit-load receiver allows numerous devices to share a bus when cable length, topology, termination, and transceiver loading permit.
Design the bus with correct differential routing, a termination strategy suited to the network topology, and protection appropriate for the installation environment. Keep the driver, receiver, and bypass-capacitor connections compact, and account for common-mode voltage and ground potential differences between remotely connected nodes. The MAX485ESA cross-reference page identifies direct drop-in options and notes that minor parametric differences may exist, so verify every replacement against the required data rate, unit load, and bus topology.
This product page combines manufacturer-level interface characteristics, package and environmental information, drop-in replacement guidance, and practical network-design considerations. It helps engineers evaluate the SP485RCN-L/TR beyond basic catalog attributes and select a compatible replacement without changing the 8-pin PCB footprint.
Alternativas drop-in para SP485RCN-L/TR — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com SP485RCN-L/TR (mesmo formato e footprint) — diferindo em Package, Operating Temperature Range, Mounting Type, RoHS Status, Package Width.
SP485R
✅ Drop-InConsulte o preço
Ver ficha técnica →SP485EN-L/TR
✅ Drop-In ⚠️ Especificações não verificadasConsulte o preço
Ver ficha técnica →SP485EMN-L/TR
✅ Drop-In ⚠️ Especificações não verificadasConsulte o preço
Ver ficha técnica →SP485RCN-L/TR Especificações
| Transceiver Type | 1/1 half-duplex transceiver |
| Supported Standards | RS-422 and RS-485 |
| Maximum Data Rate | 5 Mbps |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Nominal Supply Voltage | 5 V |
| Receiver Unit Load | 1/10 unit load |
| Maximum Transceivers per Line | More than 400 transceivers |
| Receiver Input Resistance | 150 kohm typical |
| Process Technology | BiCMOS |
| Faixa de temperatura de operação | 0 °C to +70 °C |
| Encapsulamento | 8-pin SOIC |
| Package Width | 3.90 mm |
| Tipo de montagem | Surface mount |
| Shipping Packaging | Tape and reel |
| Lead-Free Status | Lead free |
| Status RoHS | Compliant |
Configuração de pinos do SP485RCN-L/TR
| Pino 1 | RO — Receiver output |
| Pino 2 | /RE — Active-low receiver enable |
| Pino 3 | DE — Driver enable |
| Pino 4 | DI — Driver input |
| Pino 5 | GND — Ground |
| Pino 6 | A — Non-inverting driver output |
| Pino 7 | B — Inverting driver output |
| Pino 8 | VCC — Positive supply |
Aplicações típicas
SP485RCN-L/TR é adequado para 6 aplicaçãos: Industrial RS-485 Controller Networks, Building Automation and HVAC Equipment, Instrumentation and Sensor Data Links, Motor Control and Factory Automation, Telecommunications Equipment, Security and Access-Control Terminals.
Industrial RS-485 Controller Networks
The SP485RCN-L/TR fits industrial controllers that communicate with many remote nodes over a balanced RS-485 bus. Its 5 Mbps maximum data rate supports high-throughput command and telemetry traffic, while the 1/10 unit load and 150 kohm typical receiver input resistance allow more than 400 transceivers on one transmission line. Place the transceiver near the connector and routing junction, connect the differential A and B conductors to the driver outputs, and terminate only the locations required by the selected bus topology.
Recomendado
Building Automation and HVAC Equipment
The SP485RCN-L/TR is suitable for building-automation controllers, HVAC modules, and room-control units that use a common RS-485 backbone for sensors and actuators. Its low 1/10 unit load reduces the aggregate receiver demand when several controls share the cable, and its 150 kohm typical input resistance helps maintain bus amplitude. The 5 V supply integrates readily with embedded controllers, while the 8-SOIC package supports compact two-wire transceivers near terminal blocks and surge-protection components.
Recomendado
Instrumentation and Sensor Data Links
The SP485RCN-L/TR provides a noise-resistant differential interface between instrumentation, data-acquisition equipment, and remote sensors. A 5 Mbps rate gives designers margin for short, controlled links, while the receiver's high impedance limits loading across multiple distributed devices. Connect the differential bus to A and B with matched trace geometry, place a proper termination at the physical ends, and route the interface away from motors, relay contacts, and switching-power nodes to preserve signal integrity.
Recomendado
Motor Control and Factory Automation
The SP485RCN-L/TR can connect a motion controller, drive interface, or programmable controller to a factory RS-485 network. Its half-duplex topology permits shared bidirectional communication when the direction is controlled by receiver-enable and driver-enable signals. The 5 Mbps capability suits short high-speed links, while the low unit load helps when several drives or I/O modules populate the bus. Keep the transceiver ground and supply return close to the signal path and use suitable isolation or protection for long industrial cables.
Recomendado
Telecommunications Equipment
The SP485RCN-L/TR is useful in telecommunications equipment requiring a compact point-to-point or multipoint differential interface. Its high-impedance receiver supports numerous nodes without significantly loading the driver, and its 5 Mbps rate covers common supervisory, configuration, and status channels. The 8-SOIC package simplifies placement in compact line-card designs. Confirm line length, connector grounding, shield termination, and regulatory interface requirements before using the device in externally accessible communication ports.
Recomendado
Security and Access-Control Terminals
The SP485RCN-L/TR fits access-control readers, intercoms, and security panels that exchange commands and status through an RS-485 wiring network. Its low receiver loading supports larger panel networks, and the differential interface reduces susceptibility to common-mode noise encountered around access-control wiring. Keep the transceiver close to the line connector, provide local supply bypassing, and apply surge or overvoltage protection at exposed terminals. The 0 °C to 70 °C range fits many indoor and controlled-environment installations.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para SP485RCN-L/TR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | SP485R | SP485EN-L/TR | SP485EMN-L/TR |
|---|---|---|---|---|
| Brand | MaxLinear | MaxLinear | MaxLinear | MaxLinear |
| Package | 8-SOIC | 8-SOIC option - same | 8-SOIC - same | 8-SOIC - same |
Principais diferenciais
- Low receiver loading supports dense RS-485 networks (vs SP485EN-L/TR)
- Manufacturer-confirmed pin-to-pin family equivalence (vs SP485R)
- Direct 5 Mbps interface capability (vs SP485EMN-L/TR)
Notas de projeto
Route the A and B conductors as a closely matched differential pair from the transceiver pins to the connector or protection device. Minimize stub lengths and keep the pair away from switching nodes, relay contacts, and high-current motor wiring. Place the transceiver near the interface connector so transient energy is clamped before it reaches the IC. Maintain a continuous ground reference beneath the pair and connect the transceiver ground directly to the local supply ground.
Configure termination according to the physical bus topology rather than placing a resistor at every node. End the main transmission line at both physical ends with the termination value specified by the system design, and remove terminations from intermediate nodes. Stubs should be minimized because their reflected signals can reduce margin. Confirm operation at 5 Mbps over the longest cable, highest node count, and worst-case termination tolerances rather than relying only on the transceiver's maximum data-rate rating.
Do not drive the receiver and driver simultaneously without accounting for bus direction. The DE and active-low /RE inputs can be tied together for a compact control scheme, but their logic polarity and timing must match the controller. Leave unused logic inputs at defined levels. Also verify that ground-potential differences and common-mode voltage remain inside the transceiver limits, particularly between nodes connected through long cables.
Use a low-inductance local bypass capacitor from VCC to ground and place it immediately beside the supply pins. Differential signaling reduces radiated noise, but unbalanced board geometry or cable routing can reintroduce emissions. Keep the protected or filtered interface section short, preserve symmetry between A and B, and avoid sharing narrow return paths with unrelated switching currents. Validate conducted and radiated emissions with the final enclosure, cable, and termination configuration.
Informações de conformidade
RoHS-compliant and lead-free status are identified in the component information. Automotive qualification, REACH status, halogen-free status, and conflict-minerals status are not stated.