SN65HVD71D - 400kbps Full-Duplex RS-485 Transceiver | Texas Instruments
N.º de pieza: SN65HVD71D ✓ ActivoSN65HVD71D Descripción general
An RS-485 transceiver is an interface integrated circuit that converts logic-level signals into differential bus signals and converts received differential signals back into CMOS-compatible logic. RS-485 extends communication distance and noise immunity compared with single-ended interfaces by using balanced differential signaling. This family belongs to the interface IC hierarchy: transceiver > RS-485 interface > differential bus interface > semiconductor.
The SN65HVD71D provides a 3.3 V supply range of 3 V to 3.6 V, operation from -40 °C to +125 °C, and a data rate up to 400 kbps. Its 12 kV IEC-rated ESD protection helps protect the transceiver when cables are connected to external equipment. Full-duplex operation allows transmitting and receiving simultaneously, which is useful for point-to-point links and systems that cannot wait for a bus turnaround.
Internally, the device combines one differential driver and one differential receiver. The driver accepts a CMOS-compatible transmit input, while the receiver produces a CMOS-compatible receive output. The absence of enable pins simplifies control logic, although the design must manage bus direction externally when the transceiver is connected to a shared multidrop network.
Typical applications include industrial RS-485 links, building automation, factory equipment, motor-control systems, security equipment, and other long-distance serial networks. The device can also support point-to-point RS-422-style connections when the system requires independent transmit and receive paths.
Designers should check the pin assignment and termination requirements in the manufacturer datasheet before layout. A 120-ohm termination resistor is commonly used at each end of a standard RS-485 bus, while bias resistors should be placed only where required. Keep the differential pair routed together, minimize stubs, and provide a stable return path to reduce common-mode noise.
This product page combines the manufacturer's electrical specifications with practical interface guidance, application context, comparison information, and verified sourcing references. It is intended to help engineers identify whether the SN65HVD71D fits a 3.3 V full-duplex RS-485 design before beginning PCB implementation.
Alternativas directas para SN65HVD71D — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con SN65HVD71D (mismo factor de forma y huella) — difiere en Product Type, Package, Driver Enable, ESD Protection, Operating Temperature Range.
SN65HVD70DGSR
✅ Sustitución directa ⚠️ Especificaciones sin verificarConsulte el precio
Ver hoja de datos →SN65HVD72D
✅ Sustitución directa ⚠️ Especificaciones sin verificarConsulte el precio
Ver hoja de datos →SN65HVD73D
✅ Sustitución directa ⚠️ Especificaciones sin verificarConsulte el precio
Ver hoja de datos →SN65HVD71D Especificaciones
| Product Type | Full-duplex RS-485 and RS-422 transceiver |
| Supply Voltage Range | 3 V to 3.6 V |
| Nominal Supply Voltage | 3.3 V |
| Maximum Data Rate | 400 kbps |
| Driver Channels | 1 |
| Receiver Channels | 1 |
| Duplex Mode | Full duplex |
| ESD Protection | 12 kV IEC |
| Rango de temperatura de funcionamiento | -40 °C to +125 °C |
| Encapsulado | 8-pin SOIC (D) |
| Tipo de montaje | Surface mount |
| Enable Inputs | None |
| Interface Standard | RS-485 and RS-422 |
| Logic Supply | 3.3 V CMOS-compatible |
| Corriente en reposo | 1.1 mA |
| Manufacturer Packaging | 2,500 pieces per reel |
Guía de configuración de pines de SN65HVD71D 8-pin soic (d)
Configuración de pines para SN65HVD71D (encapsulado 8-pin soic (d)). La numeración de pines, las funciones y los diagramas de conexión se definen en la hoja de datos del fabricante. Consúltela para conocer el footprint exacto y las directrices de soldadura.
No hay datos detallados de patillaje disponibles para SN65HVD71D.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
SN65HVD71D es adecuado para 6 aplicacións: Industrial RS-485 Control Links, Building Automation Networks, Factory Equipment Communication, Security and Surveillance Equipment, Motor and Machinery Control, Point-to-Point RS-422 Links.
Industrial RS-485 Control Links
The SN65HVD71D suits fixed point-to-point industrial equipment links that require simultaneous transmission and reception. Its 400 kbps maximum data rate is sufficient for supervisory commands, status packets, and sensor data between controllers and remote equipment. The 3 V to 3.6 V supply range permits connection to 3.3 V embedded controllers. Unlike a shared multidrop design, a full-duplex arrangement uses independent differential paths, reducing turnaround delays. Place the transceiver near the cable connector, keep the differential route compact, and apply termination only where required by the bus configuration.
Recomendado
Building Automation Networks
The SN65HVD71D can connect building controllers, sensors, actuators, and gateways operating from a 3.3 V supply. Its full-duplex architecture allows a controller to request data while simultaneously receiving acknowledgments or periodic telemetry. The 400 kbps rate provides ample bandwidth for supervisory traffic, while 12 kV IEC ESD protection strengthens the interface against charge on cables entering an electrical enclosure. Keep the bus pair routed over a continuous ground reference and use controlled termination to avoid reflections.
Recomendado
Factory Equipment Communication
The SN65HVD71D is appropriate for full-duplex communication between factory controllers and remote equipment where concurrent traffic reduces protocol delays. Its 400 kbps data rate supports machine-state information, configuration data, and diagnostic events. The SOIC package is also compatible with conventional surface-mount assembly methods. For industrial installations, verify the complete signal path against the operating temperature and ESD requirements, provide local decoupling, and avoid long unprotected branch stubs from the main differential pair.
Recomendado
Security and Surveillance Equipment
The SN65HVD71D can connect a surveillance controller to a remote camera or access-control unit over a balanced RS-485 link. Full-duplex operation permits continuous command transmission and status reception, which is useful for centralized management. The 400 kbps rate accommodates control and telemetry traffic, while 12 kV IEC ESD protection adds valuable defense where field cables connect to external equipment. Maintain a low-impedance ground relationship between connected systems, route the differential pair together, and install external protection when the cable leaves the protected enclosure.
Recomendado
Motor and Machinery Control
The SN65HVD71D supports independent command and feedback paths in motor-control and machinery systems that prefer a full-duplex topology. The transceiver's 400 kbps rate is suitable for position, speed, alarm, and configuration messages rather than high-bandwidth motion streams. Operation from 3.3 V simplifies integration with modern controller logic. Keep the bus interface away from high-current switching paths, use a continuous reference plane beneath the pair, and verify ground potential differences before adding the device to externally powered machinery.
Recomendado
Point-to-Point RS-422 Links
The SN65HVD71D's separate differential driver and receiver also support point-to-point RS-422-style links where both ends communicate continuously. The 400 kbps limit provides sufficient bandwidth for command channels, remote I/O, and telemetry. Because it has no enable pins, external direction control is unnecessary for fixed-direction transmit and receive paths. Confirm that the board termination strategy matches the cable length and signal rate, and route the two conductors as a closely coupled differential pair.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para SN65HVD71D — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | SN65HVD70D | SN65HVD72D | SN65HVD73D |
|---|---|---|---|---|
| Package | 8-pin SOIC (D) | 8-pin SOIC (D) | 8-pin SOIC (D) | 8-pin SOIC (D) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
Diferenciadores clave
- Full-duplex operation without enable pins (frente a SN65HVD37D)
- Single 3.3 V operation with 400 kbps performance (frente a SN65HVD70D)
- 12 kV IEC-rated bus-side ESD protection (frente a SN65HVD72D)
- Industrial temperature capability (frente a SN65HVD73D)
Notas de diseño
Route the two differential bus conductors as a tightly coupled pair with a continuous reference plane beneath them. Keep the transceiver close to the connector, minimize stubs and loop area, and avoid placing the pair alongside switching nodes or high-current return paths. If the cable exits the board, provide a defined chassis or signal-ground strategy and evaluate whether an external TVS or other surge-protection device is required beyond the SN65HVD71D's 12 kV IEC ESD rating.
Do not treat the 12 kV IEC ESD rating as permission to omit system-level cable protection. The rating describes a specified ESD test condition, not immunity to every industrial surge. Check the maximum bus voltage, ground-potential difference, connector construction, cable length, and protection-device stand-off voltage. Also confirm that any external protection does not add excessive bus capacitance or leakage that could distort the 400 kbps signal.
Place the device's supply-decoupling capacitor immediately beside its supply and ground pins, and connect it with the shortest practical ground return. Follow the manufacturer datasheet for the recommended capacitor value and layout. Keep the receive and transmit logic traces away from the bus connector and protection components where possible, because fast edge transitions can couple into high-impedance logic nodes. Confirm all exposed and unused pins against the pin-description table before release.
Select termination and bias networks from the completed topology rather than copying a universal resistor arrangement. In a standard terminated bus, a 120-ohm resistor is commonly placed at each physical end, and fail-safe bias is commonly provided at one location only. The SN65HVD71D has no enable pins, so ensure the external bus design does not require controlled driver shutdown. Confirm signal polarity and naming because differential bus conventions can be described in opposite driver and receiver terms across devices.
Información de cumplimiento
The manufacturer product-page summary identifies 12 kV IEC ESD protection. Specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals statements require confirmation from the manufacturer's compliance documentation.