SN65HVD32D - 3.3V Full-Duplex RS-485 Transceiver | Texas Instruments
N.º da peça: SN65HVD32D ✓ AtivoSN65HVD32D Visão geral
An RS-485 transceiver is an interface IC that combines a differential line driver with a differential receiver. It belongs to the interface transceiver class, connects digital logic to a balanced communication bus, and supports noise-resistant transmission in industrial, commercial, and telecommunications systems. The SN65HVD32 family uses separate driver and receiver signal paths for full-duplex communication rather than sharing a single bus direction.
Key features include support for up to 256 nodes through the 1/8 unit-load option, bus-pin electrostatic-discharge protection exceeding 15 kV HBM, and driver transition times suitable for 1 Mbps signaling. The 3.3 V operating supply supports modern low-voltage digital systems, while the differential bus interface improves common-mode noise rejection. The SN65HVD32D temperature grade is rated from -40°C to 85°C for the specified D-package ordering option.
The SN65HVD3x architecture uses separate input and output pins for full-duplex bus communication. The driver converts logic-level inputs into differential bus outputs, while the receiver converts differential bus inputs into a logic-level output. Because each direction has independent signal pins, the device can transmit and receive simultaneously when the bus, termination, and system design support that operating mode.
Typical uses include industrial automation equipment, factory-floor controllers, building automation systems, telecom equipment, data acquisition systems, and other long-distance differential communication networks. In these systems, the transceiver provides the physical-layer interface between a microcontroller, DSP, FPGA, or other controller and a balanced RS-485 bus. Its 1 Mbps capability supports factory automation traffic while the 1/8 unit-load option supports networks containing as many as 256 nodes.
PCB design must preserve the differential signal path from the transceiver to the bus connector. Place termination and protection components close to the appropriate bus pins, route the driver and receiver traces as a tightly coupled pair, and provide a low-impedance ground connection. The bus should use twisted-pair cable, with termination applied according to the physical network topology rather than at every node.
This page combines manufacturer specifications, interface-application guidance, verified drop-in alternatives, and practical PCB considerations to support component selection, schematic review, and hardware design. It also highlights the distinctions that matter when comparing full-duplex transceivers, bus loading, signaling speed, package compatibility, and node-count requirements.
Alternativas drop-in para SN65HVD32D — 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 SN65HVD32D (mesmo formato e footprint) — diferindo em Package, Product Type, Maximum Cable Length, Number of Drivers, Number of Receivers.
Nenhuma alternativa drop-in disponível para este produto.
Solicitar alternativasSN65HVD32D Especificações
| Product Type | Full-duplex RS-422/RS-485 transceiver |
| Number of Drivers | 1 driver |
| Number of Receivers | 1 receiver |
| Supply Voltage Range | 3 V to 3.6 V |
| Nominal Supply Voltage | 3.3 V |
| Maximum Signaling Rate | 1 Mbps |
| Bus Standard | RS-422 and RS-485 |
| Unit Load | 1/8 unit load |
| Maximum Bus Nodes | Up to 256 nodes |
| Maximum Cable Length | Up to 1500 m |
| Bus-Pin ESD Protection | Exceeds 15 kV HBM |
| Driver Output Transition Time | Supports signaling rates up to 1 Mbps |
| Temperatura de operação | -40°C to 85°C |
| Encapsulamento | 8-pin SOIC (D), MS-012AA |
| Contagem de pinos | 8 pins |
| Tipo de montagem | Surface mount |
Guia de Configuração de Pinos do SN65HVD32D 8-pin soic (d), ms-012aa
Configuração de pinos para SN65HVD32D (pacote 8-pin soic (d), ms-012aa). A numeração dos pinos, funções e diagramas de conexão estão definidos no datasheet do fabricante. Consulte-o para o footprint exato e diretrizes de soldagem.
Nenhum dado detalhado de pinagem disponível para SN65HVD32D.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
SN65HVD32D é adequado para 6 aplicaçãos: Industrial Factory Automation, Building Automation and HVAC, Telecommunications Equipment, Data Acquisition Systems, Security and Surveillance Systems, Embedded Control and Instrumentation.
Industrial Factory Automation
The SN65HVD32D suits factory automation links that connect a controller to remotely located sensors, motor-control blocks, or instrumentation over a 3.3 V differential bus. Its 1 Mbps signaling rate accommodates common automation traffic, while the 1/8-unit-load option allows up to 256 nodes when the complete network satisfies bus-loading requirements. The 3 V to 3.6 V supply range integrates directly with 3.3 V logic. Keep the driver and receiver routes as controlled differential pairs, terminate the cable according to the bus topology, and use appropriate surge and ESD protection for factory cable transients.
Recomendado
Building Automation and HVAC
The SN65HVD32D can bridge a 3.3 V controller and building-automation equipment positioned across floors or equipment rooms. RS-485 is useful for this role because the differential interface supports long cable runs up to 1500 meters and rejects common-mode noise better than a single-ended link. The 1 Mbps maximum rate is ample for supervisory HVAC commands and status reporting, while the 1/8-unit-load option supports a larger network of field modules. Plan a single bus reference ground, preserve pair geometry through the PCB, and avoid excessive cable stubs that would distort reflections at 1 Mbps.
Recomendado
Telecommunications Equipment
The SN65HVD32D is appropriate for 3.3 V telecommunications equipment that requires a dedicated full-duplex differential interface to a remote network or rack. The 1 Mbps rate supports moderate-speed management, status, and control traffic, while cable lengths up to 1500 meters provide installation flexibility. Full-duplex operation allows transmit and receive paths to operate simultaneously when the remote equipment and cable arrangement support that mode. Designers should still evaluate enclosure grounding, surge paths, and cable protection according to the installation environment, and should use controlled impedance-aware routing for the differential pairs.
Recomendado
Data Acquisition Systems
The SN65HVD32D connects a data-acquisition controller to distributed analog or digital measurement modules when the system uses a 3.3 V RS-485 field bus. Its 1 Mbps capability supports timely command and sample-status traffic, and the 1/8-unit-load option permits up to 256 nodes for densely distributed channels. The long-cable capability helps place sensors away from the acquisition chassis while differential signaling improves noise immunity. Keep analog and digital return paths organized, use a single-point bus reference, and avoid routing the communications pair through areas containing high-current switching nodes.
Recomendado
Security and Surveillance Systems
The SN65HVD32D can serve as the 3.3 V differential communications interface between a surveillance controller and distant cameras or access equipment. A 1 Mbps RS-485 link provides sufficient control bandwidth for ordinary command, configuration, and status traffic, while cable lengths up to 1500 meters suit larger facilities. Differential signaling helps maintain reliable communication where motors, lighting, and switching equipment share the building environment. Use twisted-pair cabling, provide protection for cable-borne transients, and keep the transceiver and protection-network ground connections short to preserve signal integrity.
Recomendado
Embedded Control and Instrumentation
The SN65HVD32D is useful when a 3.3 V microcontroller or DSP must communicate with remote instrumentation through a full-duplex RS-485 interface. Its 1 Mbps rate supports command traffic and status data, while the low unit load permits many distributed instruments on one bus. The separate receiver output and driver inputs simplify full-duplex system partitioning and reduce the need to share a transceiver direction pin. Validate the controller’s UART timing, avoid overdriving the receiver output, maintain continuous pair routing, and apply termination only at the locations required by the selected bus topology.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para SN65HVD32D — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto |
|---|---|
| Package | 8-pin SOIC (D), MS-012AA |
| Brand | Texas Instruments |
| Product Type | Full-duplex RS-422/RS-485 transceiver |
| Supply Voltage | 3 V to 3.6 V |
| Maximum Data Rate | 1 Mbps |
| Bus Loading | 1/8 unit load |
| Maximum Nodes | Up to 256 nodes |
| Maximum Cable Length | Up to 1500 m |
| Bus-Pin ESD Protection | Exceeds 15 kV HBM |
| Operating Temperature | -40°C to 85°C |
Principais diferenciais
- Full-duplex operation with separate driver and receiver paths (vs SN65HVD32DR)
- High bus-node capacity (vs SN65HVD32DR)
- Long-distance differential communications (vs SN65HVD32DR)
Notas de projeto
Route the driver output and receiver input as differential pairs with consistent geometry, minimal vias, and continuous reference-plane support. Keep the transceiver ground connection short and connect it to the bus-reference ground through a low-impedance path. The SN65HVD32 datasheet emphasizes that balanced interconnect performance depends on preserving the differential signal path, so avoid splitting either pair across a plane boundary or routing it beside high-current switching nodes.
Do not place termination indiscriminately at every RS-485 node. For the usual linear topology, termination belongs at the two physical ends of the bus, and unnecessary terminations reduce bus loading and signal margin. Avoid long branch stubs because their reflections can become significant at rates up to 1 Mbps. If the physical network is not a linear bus, re-evaluate termination, node loading, and transceiver selection for the actual topology.
The SN65HVD32D operates from a 3 V to 3.6 V supply. Place the local supply-decoupling capacitor close to the device power and ground pins, use a short ground return, and avoid routing the bus or protection-current path through the quiet decoupling area. This is particularly important when the transceiver is mounted near surge-protection devices, where high-frequency transient current must be kept out of the logic-supply return path.
Use twisted-pair cable for the RS-485 bus and keep the cable away from sources of large transient currents. If the connection leaves the enclosure, add surge and ESD protection selected for the installation threat level. Protection components should be placed near the connector and bus entry point, while their return current should follow the shortest practical path to the bus-reference ground. Validate the completed network with eye-quality measurements when cable length or node count is high.
Informações de conformidade
The manufacturer product documentation identifies the SN65HVD32D as a 3.3 V full-duplex RS-485 transceiver, but no explicit compliance declaration is stated in the referenced product information.
