SP3485CN-L/TR - 10Mbps RS-485/RS-422 Transceiver | MaxLinear
N.º da peça: SP3485CN-L/TR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $0.6143 | $0,61 |
| 10 | $0.6143 | $6,14 |
| 100 | $0.6143 | $61,43 |
| 500 | $0.6143 | $307,15 |
| 1.000 | $0.6143 | $614,30 |
SP3485CN-L/TR Visão geral
An RS-485/RS-422 transceiver is a physical-layer interface IC that converts between single-ended logic signals and differential data transmitted over a balanced cable. RS-485 commonly supports multiple nodes and multidrop buses, while RS-422 is generally used for point-to-point differential links. The SP3485 supports both protocol families and provides a half-duplex arrangement in which the driver and receiver share the bus direction control function.
Key features include a 3.3 V supply, 10 Mbps data-rate capability, low-power operation, and compatibility with the Exar SP481, SP483, and SP485 devices as stated in the verified manufacturer-linked material. Its low-power design is useful when the serial transceiver must operate from a 3.3 V system without adding unnecessary interface power. The integrated driver and receiver reduce the external component count required for a bidirectional half-duplex bus.
The SP3485 uses differential signaling on the bus side and TTL/CMOS-compatible digital signaling on the logic side. In a typical application, the microcontroller UART connects to the receiver input and driver enable input, while external termination, biasing, protection, and cabling determine the physical-layer performance. The 10 Mbps capability allows the interface to support short, high-speed links as well as lower-rate communication when configured with suitable line conditioning.
Typical applications include industrial control systems, factory automation, building automation, remote sensor networks, RS-485 repeater equipment, communications modules, and test-and-measurement instruments. The transceiver is especially useful when a compact 3.3 V design needs an RS-485/RS-422 interface with both transmit and receive capability. For designs using SP3485 devices, the verified data states that the family is pin-to-pin compatible with selected Exar devices, enabling direct second-source evaluation when all electrical and qualification requirements are checked.
A key design consideration is bus termination: long or high-noise RS-485 cables commonly require termination at the physical ends of the bus. Biasing resistors should be placed only where the chosen network topology requires them, because multiple bias points can overdrive the receiver. Keep the transceiver, protection devices, connector, and ground-return arrangement close together to minimize common-mode voltage and improve signal integrity. As of 2026-10-23, the listed LCSC source reports a starting price of $0.6143; verify current commercial pricing and stock before purchasing.
Alternativas drop-in para SP3485CN-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 SP3485CN-L/TR (mesmo formato e footprint) — diferindo em Data Rate, Package, Product Type, Supply Voltage, Number of Drivers.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MAX3485CSA+
✅ Drop-In✓ Em estoque
$3.4903 / unidade
Ver ficha técnica →SP3485CN-L
✅ Drop-In✓ Em estoque
$0.43 / unidade
Ver ficha técnica →SP481
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SP483
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SP485
✅ Drop-In✓ Em estoque
$0.97 / unidade
Ver ficha técnica →MAX3485EESA+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SP3485CN-L/TR Classificações máximas e características elétricas
| Product Type | RS-485/RS-422 half-duplex transceiver |
| Tensão de alimentação | 3.3 V |
| Supply Voltage Range | 3 V to 3.6 V |
| Taxa de dados | Up to 10 Mbps |
| Number of Drivers | 1 |
| Number of Receivers | 1 |
| Communication Mode | Half-duplex |
| Supported Protocols | RS-485 and RS-422 |
| Encapsulamento | 8-pin SOIC |
| Technology | BiCMOS |
| Faixa de temperatura de operação | 0 C to 70 C |
| Tipo de montagem | Surface mount |
| Termination | External bus termination required for suitable physical-layer networks |
Configuração de pinos do SP3485CN-L/TR
| Pino 1 | RO — Receiver output |
| Pino 2 | /RE — Receiver enable input, active-low |
| Pino 3 | DE — Driver enable input |
| Pino 4 | DI — Driver data input |
| Pino 5 | GND — Ground |
| Pino 6 | A — Non-inverting bus terminal |
| Pino 7 | B — Inverting bus terminal |
| Pino 8 | VCC — Positive supply |
Aplicações típicas
SP3485CN-L/TR é adequado para 6 aplicaçãos: Industrial Control Bus, Factory Automation Sensor Network, Building Automation Communication, Remote Telemetry Link, RS-485 Repeater Interface, Test and Measurement Equipment.
Industrial Control Bus
The SP3485CN-L/TR fits industrial control links that need a compact 3.3 V differential interface with transmit and receive capability. Its one-driver/one-receiver arrangement and half-duplex operation allow a controller UART to share a multidrop RS-485 bus while maintaining communication at rates up to 10 Mbps. Use external termination at the bus ends and bias resistors only where the network topology requires them. The listed 0 C to 70 C temperature range limits its use in extended-temperature industrial equipment without additional qualification or a different transceiver.
Recomendado
Factory Automation Sensor Network
The SP3485CN-L/TR can connect remote sensors and actuators to a 3.3 V automation controller over an RS-485 bus. Differential signaling helps reject common-mode noise, while the 10 Mbps capability supports short, high-speed sensor networks and provides margin for lower-rate legacy devices. Place the transceiver near the cable connector, use a controlled ground return, and add protection appropriate to the installation environment. The device is suitable when the required temperature range and ESD requirements remain within the verified operating envelope.
Recomendado
Building Automation Communication
The SP3485CN-L/TR is suitable for building-automation nodes that exchange commands and sensor data over an RS-485 wiring backbone. Its 3.3 V supply operation fits modern embedded controllers, while half-duplex communication reduces the number of physical bus directions and can simplify system wiring. In a multi-drop installation, correct biasing and termination are essential; adding bias at several nodes may unnecessarily load the bus and reduce noise margin. The 8-pin SOIC package helps keep the interface compact beside the controller and connector.
Recomendado
Remote Telemetry Link
The SP3485CN-L/TR can provide the physical interface for a remote telemetry unit that must transmit and receive data over a balanced cable. The 10 Mbps rating permits high-speed short-range links, while the device can also operate at lower UART rates when the cable and network are suitably conditioned. Differential transmission is useful in installations where ground-potential differences may occur, but it does not replace a correctly designed ground or shield strategy. Verify cable length, connector pinout, and protection requirements before deployment.
Recomendado
RS-485 Repeater Interface
The SP3485CN-L/TR can be used in a repeater or gateway design where an RS-485 segment must be received and retransmitted to another segment. Its integrated half-duplex driver and receiver reduce the logic around the serial path, and its 3.3 V operation suits compact gateway hardware. A repeater design must control direction state carefully to avoid bus contention, and it may need galvanic isolation if the two cable sides have different ground references. The 10 Mbps capability supports short segments, but segment length and loading determine actual reach.
Recomendado
Test and Measurement Equipment
The SP3485CN-L/TR is appropriate for compact test and measurement equipment that needs a low-power RS-485 or RS-422 command interface. A 3.3 V controller can use the transceiver to connect an instrument to a computer, fixture, or laboratory automation network, while the 10 Mbps capability supports high-speed data transfer over short runs. The designer should account for the listed 0 C to 70 C range, external bus protection, calibration of termination, and isolation requirements when the instrument is connected to long or externally accessible cables.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para SP3485CN-L/TR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MAX3485CSA | SP3485CN-L | SP481 | SP483 | SP485 | MAX3485EESA+ |
|---|---|---|---|---|---|---|---|
| Package | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 |
| Brand | MaxLinear, Inc. | Maxim Integrated | MaxLinear | MaxLinear | MaxLinear | MaxLinear | Maxim Integrated |
| Special Compatibility | Pin-to-pin compatibility stated for SP481, SP483, and SP485 | MAX3485 cross-reference drop-in candidate | Related MaxLinear ordering variant | Referenced compatible device | Referenced compatible device | Referenced compatible device | MAX3485 comparison candidate |
Principais diferenciais
- 10 Mbps interface capability in an 8-pin SOIC (vs MAX3485CSA)
- Verified compatibility with selected Exar families (vs SP485)
- 3.3 V low-power BiCMOS implementation (vs SP3485CN-L)
- Direct manufacturer cross-reference path (vs MAX3485EESA+)
Notas de projeto
For an RS-485 cable, place the transceiver close to the connector and route the differential A and B conductors as a tightly coupled pair. Use a termination resistor only at the physical end of the bus, not at every node. Keep the connector, protection components, and transceiver ground return together so common-mode disturbances do not unnecessarily enter the receiver. The exact resistor values and topology must be selected from the complete manufacturer guidance.
Do not assume that any 8-pin RS-485 transceiver is automatically interchangeable. Check enable polarity, receiver-output behavior, supply limits, temperature range, timing, and the bus-side pin mapping before fitting a replacement. The verified material specifically identifies compatibility with selected Exar devices and a MAX3485CSA cross-reference candidate, but the full electrical tables were not supplied. Validate the exact replacement part rather than relying only on the package outline.
Decouple the 3.3 V supply near the transceiver with the capacitor arrangement and placement required by the manufacturer datasheet. Keep the ground return short and connect the transceiver ground to the interface ground using a low-impedance path. Because the verified data identifies a 3 V to 3.6 V supply range, do not allow transient overshoot or undershoot to exceed the device limits, especially when the transceiver is connected to long cables through protection components.
Reserve the A and B bus nets as a differential pair and avoid routing them through unrelated switching nodes. Keep the driver-enable and receiver-enable traces short enough to avoid unintended direction transitions while the bus is active. For half-duplex systems, coordinate UART direction control in firmware so the driver is disabled before switching from transmit to receive. This prevents two enabled drivers from contending on the cable.
Use a controlled cable shield or enclosure-ground strategy based on the installation requirement, and terminate any shield according to the system’s EMC strategy rather than by assumption. The verified data does not provide the SP3485CN-L/TR ESD or surge rating, so external protection may be necessary for exposed industrial cables. Select protection devices whose capacitance and clamping behavior do not distort the intended communication rate.
Informações de conformidade
The supplied verified search data does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Compliance fields remain unknown rather than inferred.
