SN65HVD08P - 3.3/5V RS-485 Transceiver | Texas Instruments
N.º da peça: SN65HVD08P ✓ AtivoSN65HVD08P Visão geral
An RS-485 transceiver is an interface IC that combines a differential line driver and differential receiver for balanced, bidirectional data transmission. Within the hierarchy of communication semiconductors, it is a physical-layer bus transceiver: the transceiver converts logic-level signals into differential bus signals and reconstructs digital data from those differential voltages. This makes the SN65HVD08P suitable for industrial control, instrumentation, and distributed systems operating on a multipoint bus.
The SN65HVD08P operates from a 3.3-V or 5-V supply and is designed for interoperability with ANSI TIA/EIA-485-A and ISO-8482E compliant devices. Its wide supply range allows use in systems powered from 5-V power buses that may experience line-voltage drops of as much as 2 V. Open-circuit, short-circuit, and idle-bus failsafe receiver behavior helps the receiver interpret inactive-bus conditions deterministically.
The 1/8-unit-load rating is the principal bus-loading figure because it determines how many nodes can share the same twisted-pair network. Up to 256 nodes are supported when system topology, cable length, termination, and transceiver loading permit the complete network to remain within its communication limits. The half-duplex architecture requires one wired-AND bus, and the driver and receiver paths share access to the same differential pair.
Typical applications include industrial sensor networks, programmable logic controller communication, factory automation equipment, building-control systems, and RS-485-to-serial interface bridges. The low quiescent power is useful in distributed or remotely powered equipment, while the failsafe receiver improves system behavior when the bus is disconnected, shorted, or idle.
PCB implementation should preserve the differential pair as a controlled-impedance, closely coupled route and provide the termination and biasing required by the selected network topology. Decoupling should be placed close to the supply and ground pins, while protection devices should be selected to handle the cable environment without loading the bus excessively.
This page organizes the device specifications, same-package replacement options, interface applications, and practical RS-485 design guidance into one engineering-focused reference for evaluating the SN65HVD08P.
Alternativas drop-in para SN65HVD08P — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
SN65HVD11PW
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SN75HVD08P
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SN65HVD08P Especificações
| Product Type | Half-duplex RS-485 transceiver |
| Supply Voltage Range | 3 V to 5.5 V |
| Nominal Supply Voltage | 3.3 V or 5 V |
| Quiescent Power Consumption | Less than 90 mW |
| Driver and Receiver Count | 1 driver and 1 receiver |
| Unit Load | 1/8 unit load |
| Maximum Bus Nodes | Up to 256 nodes |
| Bus-Pin ESD Protection | Exceeding 16 kV HBM |
| Receiver Failsafe | Open-circuit, short-circuit, and idle-bus failsafe |
| Supported Standards | ANSI TIA/EIA-485-A and ISO-8482E |
| Power-Bus Line Drop Tolerance | As much as 2 V |
| Package Type | PDIP (P), 8 pins |
| Package Pitch | 7.62 mm |
| Package Body Width | 0.300 in |
| Tipo de montagem | Through-hole |
| Logic Compatibility | RS-422 and RS-485 |
Configuração de pinos do SN65HVD08P
| Pino 1 | RO — Receiver output |
| Pino 2 | /RE — Receiver enable, active low |
| Pino 3 | DE — Driver enable, active high |
| Pino 4 | DI — Driver data input |
| Pino 5 | GND — Ground |
| Pino 6 | A — Non-inverting differential bus terminal |
| Pino 7 | B — Inverting differential bus terminal |
| Pino 8 | VCC — Power supply |
Aplicações típicas
SN65HVD08P é adequado para 6 aplicaçãos: Industrial Sensor Networking, Programmable Controller Communication, Factory Automation Equipment, Building Control Networks, Remote Instrumentation, RS-485 Serial Interface Bridge.
Industrial Sensor Networking
The SN65HVD08P fits industrial sensor networks that distribute measurements over a wired RS-485 bus. Its 1/8-unit-load receiver supports as many as 256 nodes, allowing multiple remote sensors to share the bus when cable length and topology permit. The less-than-90-mW quiescent consumption reduces standby demand in distributed equipment, while the differential interface supports reliable communication over industrial cable runs. Designers should retain a controlled-impedance A-to-B route, install termination only at the physical ends, and add appropriate biasing for an idle bus.
Recomendado
Programmable Controller Communication
The SN65HVD08P is useful for connecting programmable logic controllers, remote I/O modules, and operator panels over a half-duplex RS-485 network. Its 3 V to 5.5 V supply range supports both 3.3-V and 5-V controller platforms, and the 256-node rating provides substantial bus capacity. The open-circuit, short-circuit, and idle-bus failsafe receiver helps the controller interpret an inactive network consistently. Because driver and receiver share the bus, firmware must prevent simultaneous transmission and should include bus-idle, retry, and contention handling.
Recomendado
Factory Automation Equipment
The SN65HVD08P supports factory automation equipment that links actuators, motion controllers, and condition-monitoring modules over a reliable differential bus. Its low 1/8-unit-load interface enables dense networks, while the less-than-90-mW quiescent consumption limits power in continuously energized machines. The transceiver's bus-pin ESD protection exceeding 16 kV HBM is valuable around electrically noisy industrial equipment. Maintain clear separation between the RS-485 pair and switching-power nodes, and validate surge and ESD requirements against the complete enclosure and cabling design.
Recomendado
Building Control Networks
The SN65HVD08P can connect room controllers, HVAC equipment, access-control readers, and environmental sensors in a building-control network. Its 3.3-V or 5-V operation suits controller electronics, while the 1/8-unit-load rating allows numerous field devices to share one bus. Differential signaling helps maintain data integrity across building wiring and equipment-ground differences. For reliable deployments, follow the network's biasing scheme, avoid placing unnecessary termination at interior nodes, and test the completed cable run for reflections and common-mode voltage limits.
Recomendado
Remote Instrumentation
The SN65HVD08P suits remote instrumentation where measurement equipment communicates with a central logger over a long RS-485 cable. The 1/8-unit-load receiver allows up to 256 nodes, and the low quiescent power is advantageous when field devices include sleep modes or limited power budgets. The transceiver's idle-bus and short-circuit failsafe behavior improves interpretation of disconnected field wiring. Use twisted-pair cabling, establish one defined bias point, and keep the differential route away from motors, relay contacts, and high-current switching nodes.
Recomendado
RS-485 Serial Interface Bridge
The SN65HVD08P is appropriate for a compact bridge between a host UART and a field-level RS-485 network. Its half-duplex architecture requires the bridge firmware to assert driver enable only during transmission and switch to receiver mode promptly afterward. A 1/8-unit-load interface permits numerous downstream devices, while the 3.3-V or 5-V supply range allows integration with common host controllers. Because propagation timing and bus turnaround affect throughput, confirm the device timing against the bridge firmware and enable polarity before finalizing the interface.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para SN65HVD08P — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | SN65HVD11PW | SN75HVD08P |
|---|---|---|---|
| Package | PDIP (P), 8 pins | PDIP (P), 8 pins | PDIP (P), 8 pins |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Transceiver Type | Half-duplex RS-485 transceiver | Half-duplex RS-485 transceiver | Single transmitter/receiver RS-485 transceiver |
| Driver and Receiver Count | 1 driver and 1 receiver | 1 driver and 1 receiver | 1 driver and 1 receiver |
Principais diferenciais
- High node density for a through-hole RS-485 interface (vs SN75HVD08P)
- Explicit failsafe operation for abnormal bus states (vs SN65HVD11PW)
- Low standby consumption in distributed nodes (vs SN75HVD08P)
Notas de projeto
Route the A and B conductors as a closely coupled differential pair over the full PCB length. Keep the pair away from switching nodes, relay contacts, motor traces, and high-current power paths. Use a solid ground reference beneath the pair, minimize stubs to transceiver and protection components, and apply the network's termination only at the physical bus endpoints.
Do not allow transmit data to remain asserted when the driver is disabled or when the bus direction changes. The SN65HVD08P is half-duplex, so the host must control DE and /RE without contention. Verify enable polarity, driver and receiver turnaround timing, bus-idle detection, and retry behavior against the device timing before releasing the design for production.
Place the supply bypass capacitor close to pin 8 and provide a short return path from pin 5 to the ground reference. Confirm the capacitor voltage rating, effective capacitance, and dielectric behavior at the system's operating temperature. Maintain separation between the bus pair and noisy power-conversion components to preserve the benefit of differential signaling.
Use a single, defined fail-safe bias network for the bus and ensure its resistance does not exceed the loading allowed by the complete transceiver population. Terminate the A-to-B pair at both ends for a conventional linear bus. After installation, check differential and common-mode voltages at the farthest node because cable routing and grounding can influence the usable communication margin.
Informações de conformidade
The manufacturer material identifies ANSI TIA/EIA-485-A and ISO-8482E interoperability. No definitive RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations were identified for the specific SN65HVD08P orderable.
