SN65HVD55D - 1Mbps Full-Duplex RS-485 | Texas Instruments
N.º de pieza: SN65HVD55D ✓ ActivoSN65HVD55D Descripción general
An RS-485 transceiver is a bidirectional communications interface that combines a differential line driver, a differential receiver, and associated enable controls. It belongs to the interface-IC hierarchy and enables robust communication over long, noisy cables by representing digital data as a differential voltage across a balanced pair of conductors. The SN65HVD55D uses separate driver and receiver paths, allowing full-duplex operation on a four-wire bus.
Key features include a maximum data rate of 1 Mbps, 1/8-unit-load operation, and optional driver transition times intended for signaling rates of 1 Mbps, 5 Mbps, and 25 Mbps. The low-current standby mode consumes 1 µA, making the enables useful for power-conscious systems. Bus-pin ESD protection exceeding 15 kV HBM helps improve robustness where cables connect the transceiver to external equipment.
The high-output architecture increases the amount of signal energy available on the bus, while the receiver's 50 mV hysteresis rejects noise within the transition region between differential output states. The device is suitable for RS-422 and RS-485 equipment where point-to-point or multipoint differential signaling is required. Its independent enable controls permit the driver and receiver to be switched according to the operating state of the connected system.
Typical applications include industrial automation equipment, factory-floor controllers, building-control systems, data-acquisition equipment, communications modules, and external bus interfaces. In a full-duplex installation, the driver connects to one differential pair and the receiver connects to another pair, allowing simultaneous transmission and reception without sharing the same bus conductors.
Designers should account for cable length, topology, termination, grounding, and the slew-rate option when selecting the device. The bus must remain within the transceiver's specified electrical limits, and unused inputs should be handled according to the manufacturer guidance. Enable sequencing should also prevent simultaneous bus contention where multiple nodes share a conductor pair.
This product page combines the verified manufacturer description, distributor availability, package information, RS-485 operating characteristics, and documented family differences. It also provides application guidance and a structured comparison for engineers evaluating drop-in interface choices without adding unverified electrical claims.
Alternativas directas para SN65HVD55D — 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 SN65HVD55D (mismo factor de forma y huella) — difiere en Product Type.
SN65HVD54D
✅ Sustitución directa ⚠️ Especificaciones sin verificarConsulte el precio
Ver hoja de datos →SN65HVD53D
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
SN65HVD55D Especificaciones
| Product Type | Full-duplex RS-485 driver and receiver with enables |
| Interface Support | RS-422 and RS-485 |
| Transceiver Configuration | 1 transmitter and 1 receiver |
| Maximum Data Rate | 1 Mbps |
| Receiver Hysteresis | 50 mV |
| Unit Load | 1/8 unit load |
| Maximum Bus Nodes | 256 nodes |
| Bus-Pin ESD Protection | Exceeds 15 kV HBM |
| Driver Transition-Time Options | 1 Mbps, 5 Mbps, and 25 Mbps signaling-rate options |
| Standby Current | 1 µA |
| Rango de temperatura de funcionamiento | -40°C to +85°C |
| Tensión de alimentación de funcionamiento | 5 V |
| Encapsulado | 14-pin SOIC (D) |
| Package Width | 3.90 mm (0.154 inch) |
| Tipo de montaje | Surface Mount |
| Reported Distributor Stock | 7,120 pieces |
| Reported Unit Price | $4.6194 |
Guía de configuración de pines de SN65HVD55D 3.90 mm (0.154 inch)
Configuración de pines para SN65HVD55D (encapsulado 3.90 mm (0.154 inch)). 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 SN65HVD55D.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
SN65HVD55D es adecuado para 6 aplicacións: Industrial Automation Interfaces, Building Control Networks, Data Acquisition Equipment, Remote Monitoring Terminals, Full-Duplex Communications Modules, External Bus Port Protection.
Industrial Automation Interfaces
The SN65HVD55D fits industrial automation equipment that communicates over differential RS-485 networks. Its 1 Mbps maximum data rate supports factory-control traffic, while the 1/8-unit-load option can accommodate as many as 256 nodes when the complete bus loading remains within specification. The 50 mV receiver hysteresis helps distinguish valid differential states in electrically noisy environments. Designers should use the device between a host UART or controller and a protected field-bus connector, while accounting for cable length, termination, grounding, and any required surge-protection components.
Recomendado
Building Control Networks
The SN65HVD55D is appropriate for building-control equipment that distributes commands and sensor data across a wired RS-485 backbone. The supported 1 Mbps rate provides useful headroom for common control traffic, and the 1/8-unit-load capability permits a larger installation when load, stub, and topology requirements are satisfied. Its standby current of 1 µA supports power-managed access panels and controllers. The interface should be placed at the physical bus boundary, with protection designed for the installation’s surge and ESD environment rather than relying solely on the internal 15 kV HBM bus-pin rating.
Recomendado
Data Acquisition Equipment
The SN65HVD55D supports data-acquisition systems that must move commands or sampled data reliably across a multi-drop RS-485 network. Its 1 Mbps limit accommodates moderate-rate telemetry, and the 1/8-unit-load option supports up to 256 nodes, allowing multiple sensors or instrument modules to share a bus when no individual node exceeds its permitted loading. The 50 mV receiver hysteresis provides additional margin against noise, but engineers should still maintain a defined reference ground, control cable geometry, and use termination only where required by the selected topology.
Recomendado
Remote Monitoring Terminals
The SN65HVD55D is useful in remote monitoring terminals that exchange status and control information over an industrial serial network. The verified 1 Mbps data rate supports responsive command traffic, while separate driver and receiver enables allow the communications section to be controlled independently. Low-current standby operation consumes 1 µA, which can benefit duty-cycled terminals and instrumentation. The interface should be enabled only when the attached bus is safe to drive, and the design should include isolation or surge protection when the cable leaves the controlled enclosure.
Recomendado
Full-Duplex Communications Modules
The SN65HVD55D is appropriate for a full-duplex communications module using separate differential pairs for transmission and reception. Its 1/1 transceiver configuration combines one driver and one receiver, and the independent enable controls provide local control over both directions. The maximum signaling rate of 1 Mbps is suitable for moderate-speed command and response traffic. Unlike half-duplex shared-bus designs, this arrangement avoids requiring both nodes to share the same driver pair, although both sides must still use a consistent wiring plan and common-mode strategy.
Recomendado
External Bus Port Protection
The SN65HVD55D can form part of an external equipment interface where connected cables introduce ESD events. According to the verified family data, its bus pins provide ESD protection exceeding 15 kV HBM, while 50 mV receiver hysteresis improves noise immunity during data detection. These features strengthen the communications endpoint but do not eliminate the need for application-specific protection. A production design should evaluate whether external surge, ground-fault, or high-energy transient requirements call for separate protection and isolation beyond the transceiver’s internal HBM-rated capability.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para SN65HVD55D — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | SN65HVD54D | SN65HVD53D |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-pin SOIC (D) | 14-pin SOIC (D) - same package | 14-pin SOIC (D) - same package |
| Product Type | High-output full-duplex RS-485 driver and receiver with enables | RS-485 driver and receiver in the SN65HVD5x family | RS-485 driver and receiver in the SN65HVD5x family |
| Driver Enable Polarity | Active high | Active high | Active high |
| Receiver Enable Polarity | Active low | Active low | Active low |
Diferenciadores clave
- Verified 1 Mbps full-duplex operation with separate enables (frente a SN65HVD54D)
- Supports substantially larger RS-485 bus loading (frente a SN65HVD53D)
- High bus-pin ESD protection (frente a SN65HVD54D)
- Very low standby consumption (frente a SN65HVD53D)
Notas de diseño
Do not assume that two 14-pin SOIC RS-485 devices are interchangeable solely because their packages match. The verified family information confirms that SN65HVD53, SN65HVD54, and SN65HVD55 share active-high driver enables and active-low receiver enables, but it does not quantify their complete electrical differences. Compare supply range, bus output voltage, receiver thresholds, transition time, unit loading, and ESD ratings against the manufacturer datasheet before approving a substitution.
Place the transceiver close to the connector and route the differential bus pair as a tightly coupled pair on a continuous reference plane. Keep the driver and receiver bus traces away from switching nodes and high-current edges. Provide a low-impedance connection between the transceiver ground and the board’s communication-reference ground, while observing the datasheet’s external-component and common-mode recommendations to avoid introducing ground-loop currents.
Decouple the transceiver supply close to its supply and ground pins, then verify startup and enable sequencing at the system level. The verified standby current is 1 µA, but that low figure does not describe active-supply consumption or transient demand. Avoid enabling the driver while another connected node is actively driving the same bus pair, because simultaneous outputs can produce bus contention and excessive current.
Use termination and biasing only where required by the selected cable and topology. The device supports 1/8-unit-load operation and up to 256 nodes, but those figures do not authorize arbitrary stub lengths or unrestricted cable runs. Keep unused bus inputs in a defined state, use the receiver’s 50 mV hysteresis advantage as part of the noise-margin budget, and evaluate external surge protection when cables leave the controlled enclosure.
Información de cumplimiento
The supplied verified data identifies the component as a Texas Instruments interface IC but does not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable because this is an industrial RS-485 communications transceiver rather than an automotive-qualified device.