SP485REN-L - 5Mbps RS-485 Transceiver | MaxLinear | SOIC-8
Référence : SP485REN-L ✓ ActifSP485REN-L Présentation
An RS-485 transceiver is an interface IC that combines a differential line driver and differential receiver, allowing reliable bidirectional communication over long, electrically noisy interconnects. The SP485REN-L belongs to the RS-422/RS-485 interface hierarchy within the broader semiconductor and industrial-control markets. Its half-duplex architecture supports a shared differential pair through a direction-control input, making it suitable for multidrop buses, remote monitoring, factory automation, and building-control networks.
The principal feature of the SP485REN-L is its low 1/10-unit-load receiver input. According to the manufacturer product information, this impedance permits more than 400 transceivers on a single transmission line without degrading the RS-485 driver signal. The device operates from a 4.75 V to 5.25 V supply, communicates at rates up to 5 Mbps, and supports an industrial temperature range of -40°C to 85°C. Its BiCMOS implementation combines low-power operation with high communication performance.
The SP485REN-L uses a half-duplex arrangement in which the driver and receiver share differential bus terminals. A driver-enable control determines whether the device transmits, while a receiver-enable control determines whether the receiver is active. The high receiver impedance is particularly useful when numerous nodes must share one cable because it limits loading of the bus. This characteristic also distinguishes the SP485REN-L from the standard SP485 configuration for designs where node count is a primary constraint.
Typical applications include industrial sensor networks, PLC-to-remote-I/O links, building automation equipment, telecommunications infrastructure, instrumentation, and industrial motor-control systems. A half-duplex implementation can connect a controller to distributed sensors over one twisted pair, while the 5 Mbps capability provides useful margin for moderate-speed industrial links and point-to-point backplanes.
Designers should account for bus termination, fail-safe biasing, common-mode range, and cable length when integrating the transceiver. Place the transceiver close to the connector and route the differential pair as a balanced pair to minimize noise pickup. The external enable logic must also prevent driver contention, particularly during startup or fault-recovery conditions.
This page combines device specifications, package and pin information, application guidance, drop-in alternatives, and practical interface-design considerations. It helps engineers compare bus loading, data rate, package compatibility, and protection requirements before assigning the SP485REN-L to a new RS-485 design.
Alternatives de remplacement direct pour SP485REN-L — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec SP485REN-L (même facteur de forme et même empreinte) — différant par Operating Temperature Range, Product Type, Package, Data Rate, Quiescent Supply Current.
SP485EMN-L/TR
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →SP485EEN-L
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →SP485EN-L
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →ST485ERBDR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ST485EBDR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX485EESA+
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →SP485REN-L Spécifications
| Product Type | Half-duplex RS-422/RS-485 transceiver |
| Maximum Data Rate | 5 Mbps |
| Receiver Input Load | 1/10 unit load |
| Maximum Nodes per Bus | More than 400 transceivers |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Quiescent Supply Current | 900 uA |
| Plage de température de fonctionnement | -40°C to 85°C |
| Boîtier | 8-pin SOIC, 3.90 mm wide body |
| Type de montage | Surface mount |
| Process Technology | BiCMOS |
| Receiver Input Impedance | High impedance |
| Duplex Mode | Half-duplex |
| Supported Standards | RS-422 and RS-485 |
| Logic Supply Voltage | 4.75 V to 5.25 V |
Configuration des broches de SP485REN-L
| Broche 1 | RO — Receiver output |
| Broche 2 | /RE — Active-low receiver enable |
| Broche 3 | DE — Driver enable |
| Broche 4 | DI — Driver data input |
| Broche 5 | GND — Ground |
| Broche 6 | A — Non-inverting bus terminal |
| Broche 7 | B — Inverting bus terminal |
| Broche 8 | VCC — Positive supply |
Applications typiques
SP485REN-L convient pour 6 applications: Industrial Sensor Multidrop Bus, Building Automation and HVAC Control, Remote Instrumentation Network, Telecommunications Power and Control Link, Factory Motor-Control Monitoring, Point-to-Point Data-Link Backplane.
Industrial Sensor Multidrop Bus
The SP485REN-L fits industrial sensor buses that place many distributed measurement nodes on one RS-485 cable. Its 1/10-unit-load receiver input allows more than 400 transceivers on a transmission line according to the manufacturer, reducing the electrical load compared with a one-unit receiver. This capability is useful in production cells where temperature, pressure, and valve-position nodes share a long industrial backbone. The device supports data rates up to 5 Mbps, although practical distance must be reduced as baud rate rises. Use controlled bus topology, termination at both physical ends, and one defined fail-safe bias location.
Recommandé
Building Automation and HVAC Control
The SP485REN-L can connect controllers, room modules, and HVAC equipment over a shared RS-485 network. Its half-duplex driver and receiver architecture supports two-wire communication while the 1/10-unit-load receiver provides ample node-loading margin for building floors with numerous room controllers. A supply range of 4.75 V to 5.25 V fits conventional 5 V automation electronics. The 5 Mbps maximum rate is more than adequate for supervisory HVAC traffic, while the -40°C to 85°C range supports equipment rooms and industrial building controls.
Recommandé
Remote Instrumentation Network
The SP485REN-L is appropriate for remote laboratory and process instrumentation that connects several nodes over a balanced cable. Its high receiver impedance helps maintain the RS-485 driver signal when numerous transceivers share the line, while the 5 Mbps capability supports short, high-rate instrument links and longer, lower-rate field connections. The device is normally used with a direction-control signal from the host controller. Care should be taken to isolate the transceiver from ground-potential differences in remote installations and to select external protection appropriate for the cable environment.
Recommandé
Telecommunications Power and Control Link
The SP485REN-L can serve as the physical-layer interface for low- and medium-speed supervisory links in telecommunications equipment. A 5 V supply range, 900 uA quiescent current, and half-duplex operation suit embedded control modules that communicate status and configuration over an RS-485 backplane. The 1/10-unit-load receiver allows designers to connect multiple cards or remote units without quickly overloading the bus. The transceiver should be placed near the connector, and its differential route should remain away from switching power nodes to minimize coupling from high-edge-rate circuitry.
Recommandé
Factory Motor-Control Monitoring
The SP485REN-L supports supervisory communication between motor controllers, condition-monitoring modules, and a factory controller. Its high-impedance receiver allows multiple monitoring nodes to share a common RS-485 wiring run without loading the source aggressively. The 5 Mbps transceiver capability provides substantial link-rate margin for status polling, while the -40°C to 85°C operating range suits industrial enclosures. Keep the interface circuitry separated from high-current motor switching paths, use a shielded twisted pair where needed, and apply surge protection according to the installation's cable length and grounding conditions.
Recommandé
Point-to-Point Data-Link Backplane
The SP485REN-L can also implement a short point-to-point link where a panel controller communicates with a remote controller through a balanced pair. Although its 1/10-unit-load receiver is primarily beneficial on crowded multidrop buses, the same electrical interface supports two-node links and short backplanes. The 5 Mbps maximum data rate is useful for transferring configuration blocks or diagnostic data. For installations spanning separate power domains or large ground-potential differences, add galvanic isolation and verify the isolated interface's logic levels against the SP485REN-L control signals.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour SP485REN-L — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | SP485EMN-L/TR | SP485EEN-L | SP485EN-L | ST485ERBDR | ST485EBDR |
|---|---|---|---|---|---|---|
| Manufacturer | MaxLinear | MaxLinear | MaxLinear | MaxLinear | STMicroelectronics | STMicroelectronics |
| Package | 8-pin SOIC | 8-pin SOIC - same | 8-pin SOIC - same | 8-pin SOIC - same | 8-pin SOIC - same | 8-pin SOIC - same |
| Transceiver Type | Half-duplex RS-422/RS-485 | SP485-family half-duplex RS-422/RS-485 | SP485-family half-duplex RS-422/RS-485 | SP485-family half-duplex RS-422/RS-485 | RS-485 transceiver | RS-485 transceiver |
Principaux différenciateurs
- Lower receiver loading for large multidrop networks (vs SP485EN-L)
- Pin-compatible protection upgrade path (vs SP485EMN-L/TR)
- Five-megabit performance within the SP485 family (vs ST485EBDR)
Notes de conception
Place the SP485REN-L close to the RS-485 connector and route terminals A and B as a tightly coupled differential pair. Keep the pair away from switching nodes, relay contacts, motor traces, and high-current return paths. If a TVS or common-mode choke is used, place it at the connector side of the PCB and provide a short, direct return into the protection-network ground. Avoid stubs and test pads that create unnecessary discontinuities.
Do not enable the driver and receiver simultaneously when the transceiver shares a bus with another active transmitter. Assert driver enable only during transmission, and allow the driver to become high impedance before another node drives the line. External fail-safe biasing should be defined once at a designated point in the network rather than duplicated at every node, since multiple bias networks can alter the bus common-mode voltage during operation.
Treat the differential pair as a controlled-impedance, balanced structure when cable length, topology, or EMI requirements justify it. Terminate the bus at the two physical ends, use twisted-pair cabling, and avoid star branches with long stubs. Although the SP485REN-L supports rates up to 5 Mbps and more than 400 transceivers, actual distance and fault margin depend on baud rate, cable loss, node loading, termination, common-mode range, and the installation environment.
Informations de conformité
The available product information does not explicitly establish the requested compliance and material-status declarations. AEC-Q100 is not applicable to this general-purpose interface IC.
