SN65HVD74D - 3.3V 20Mbps Full-Duplex RS-485 | TI
N.º da peça: SN65HVD74D ✓ AtivoSN65HVD74D Visão geral
A transceiver interface IC converts between digital logic signals and balanced differential bus signals. The SN65HVD74 belongs to the RS-485 transceiver category within interface ICs, interface semiconductors, and broader communication semiconductors. Its differential signaling improves noise immunity by comparing the voltage between two bus conductors rather than referencing one conductor to ground, making it suitable for industrial, building-automation, and communications equipment operating over longer cable runs.
The SN65HVD74D combines a 20 Mbps maximum data rate with more than 30 kV HBM ESD protection and more than 12 kV IEC61000-4-2 contact-discharge protection. Receiver hysteresis is 70 mV, helping reject conducted differential noise and prevent unwanted output transitions. Separate driver and receiver input and output pins support full-duplex bus arrangements without sharing a single half-duplex direction-control path.
The transceiver operates from a single 3.3 V power supply and supports both RS-485 and RS-422 interface applications. Its surface-mount SOIC package permits automated assembly, while the stated -40°C to 125°C operating range supports industrial equipment, data-acquisition systems, factory controls, and industrial communication equipment. Each driver and receiver has separate input and output pins, allowing transmit and receive paths to operate simultaneously.
Typical applications include full-duplex RS-485 industrial networks, high-speed instrumentation links, factory automation equipment, building-control systems, and industrial data acquisition. In a typical circuit, the microcontroller-facing pins connect to digital logic, while the differential A, B, Y, and Z pins connect to the balanced bus through suitable termination and protection components. The 70 mV receiver hysteresis helps maintain reliable decisions in electrically noisy environments.
When designing the interface, maintain compatible logic levels, observe recommended bus biasing and termination, and verify that the selected cable length and topology remain valid for 20 Mbps operation. Protection-device capacitance should be included when calculating edge rate and channel performance. The 3.3 V supply must remain within the specified 3.0 V to 3.6 V range, and system designers should check all logic thresholds against their controlling device.
This page combines the manufacturer's key electrical and environmental ratings with practical interface-design guidance, packaging information, and a focused drop-in replacement assessment. It highlights where the SN65HVD74D fits within a 3.3 V full-duplex RS-485 design and the checks that matter when evaluating bus speed, ESD robustness, receiver noise immunity, and PCB implementation.
Alternativas drop-in para SN65HVD74D — 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 SN65HVD74D (mesmo formato e footprint) — diferindo em Duplex Mode, Package, Product Type.
SN65HVD30D
✅ Drop-InConsulte o preço
Ver ficha técnica →SN65HVD74D Especificações
| Product Type | Full-duplex RS-485 transceiver |
| Tensão de alimentação | 3.3 V |
| Operating Supply Voltage Range | 3.0 V to 3.6 V |
| Maximum Data Rate | 20 Mbps |
| Driver and Receiver Configuration | 1/1 transceiver |
| Communication Standard | RS-422 and RS-485 |
| Duplex Mode | Full duplex |
| IEC ESD Protection | 12 kV |
| IEC61000-4-2 Contact Discharge Protection | Greater than 12 kV |
| HBM ESD Protection | Greater than 30 kV |
| Receiver Hysteresis | 70 mV |
| Faixa de temperatura de operação | -40°C to 125°C |
| Power Supply Architecture | Single 3.3 V supply |
| Driver Inputs and Receiver Outputs | Separate pins for full-duplex communication |
| Encapsulamento | 8-pin SOIC |
| Tipo de montagem | Surface mount |
| Shipping Package | Tube |
Configuração de pinos do SN65HVD74D
| Pino 1 | RO — Receiver output |
| Pino 2 | RE — Receiver enable, active low |
| Pino 3 | DE — Driver enable |
| Pino 4 | DI — Driver input |
| Pino 5 | GND — Device ground |
| Pino 6 | Y — Non-inverting driver output |
| Pino 7 | A — Non-inverting receiver input and driver output |
| Pino 8 | VCC — Power supply |
Aplicações típicas
SN65HVD74D é adequado para 6 aplicaçãos: Full-Duplex Industrial RS-485 Networks, Factory Automation Equipment, Building Control Systems, Industrial Data Acquisition, High-Speed Instrumentation Links, RS-422 Point-to-Point Communication.
Full-Duplex Industrial RS-485 Networks
The SN65HVD74D fits full-duplex industrial RS-485 networks because it combines one differential driver and one differential receiver with separate input and output paths. According to the Texas Instruments SN65HVD7x datasheet, the device operates from a single 3.3 V supply and supports rates up to 20 Mbps. Its 70 mV receiver hysteresis helps reject conducted differential noise in factory environments. Design the bus with valid termination, biasing, cable length, and topology for the target data rate, while using its more than 12 kV IEC61000-4-2 contact protection as part of a complete board-level ESD strategy.
Recomendado
Factory Automation Equipment
Factory automation equipment benefits from the SN65HVD74D's 20 Mbps full-duplex RS-485 interface and 3.0 V to 3.6 V operating range. The differential driver and receiver allow a controller to exchange data with remote modules while the 70 mV receiver hysteresis improves noise immunity around motors, contactors, and switching supplies. According to the Texas Instruments product page, the device provides 12 kV IEC ESD protection. Place the transceiver near the bus connector, decouple the 3.3 V supply locally, and confirm that the cable, protection devices, and grounding strategy preserve usable bandwidth at the selected link rate.
Recomendado
Building Control Systems
The SN65HVD74D is suitable for building-control networks that require deterministic full-duplex communication from a 3.3 V controller. Its 20 Mbps capability provides substantial link headroom for sensors, room controllers, gateways, and supervisory equipment, while the 70 mV receiver hysteresis assists operation in systems with electrically coupled loads. According to the Texas Instruments SN65HVD7x datasheet, the transceiver operates across -40°C to 125°C, supporting varied building-environment equipment. Use proper bus termination and biasing, keep differential routing symmetrical, and validate the installation against the required RS-485 system parameters and any external surge threats.
Recomendado
Industrial Data Acquisition
Industrial data-acquisition systems can use the SN65HVD74D to connect a controller or measurement system to remote sensors over a full-duplex RS-485 link. The 20 Mbps data rate supports high-speed data transfer, while the 1/1 transceiver arrangement provides simultaneous transmit and receive capability. Its 70 mV receiver hysteresis helps maintain stable data decisions when differential noise is present. According to the Texas Instruments product page, the device operates at 3.3 V and includes 12 kV IEC ESD protection. Select cable length and topology carefully, preserve pair routing, and place external protection so its capacitance does not unnecessarily reduce edge-rate margin.
Recomendado
High-Speed Instrumentation Links
The SN65HVD74D suits instrumentation links requiring a 3.3 V full-duplex interface with throughput as high as 20 Mbps. According to the Texas Instruments SN65HVD7x datasheet, separate driver and receiver inputs and outputs allow transmit and receive paths to operate simultaneously. The 70 mV receiver hysteresis adds noise margin for laboratory and industrial environments. Place the SOIC device close to the connector, maintain a continuous ground reference, route the differential conductors as a pair, and evaluate connector and protection capacitance before assuming that the 20 Mbps device rating can be reached in every cable and topology combination.
Recomendado
RS-422 Point-to-Point Communication
Although primarily described as an RS-485 transceiver, the SN65HVD74D also supports RS-422 interface applications according to distributor product classification. Its separate differential driver and receiver paths can implement full-duplex point-to-point communication from a 3.3 V system, and its 20 Mbps rating provides ample speed for short instrument and control links. According to the Texas Instruments product page, the device operates from 3.0 V to 3.6 V with 70 mV receiver hysteresis. Confirm the receiver's response to the required noise and fault conditions, provide the appropriate termination, and route each differential pair to minimize pickup from nearby switching circuitry.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para SN65HVD74D — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | SN65HVD30D |
|---|---|---|
| Package | 8-pin SOIC (D) | 8-pin SOIC (D) |
| Brand | Texas Instruments | Texas Instruments |
Principais diferenciais
- Higher data-rate capability than the identified older replacement (vs SN65HVD30D)
- Stronger interface ESD positioning (vs SN65HVD30D)
- Explicit full-duplex interface with separate signal paths (vs SN65HVD30D)
Notas de projeto
Place the SN65HVD74D close to the external connector and route the differential conductors as a tightly coupled pair. Keep the driver-side and receiver-side bus nets within the transceiver's recommended topology, use a continuous ground reference beneath the pair, and avoid crossing digital or switching-current paths. The 20 Mbps device rating provides link headroom, but connector transitions, protection capacitance, stub lengths, and trace impedance discontinuities can still reduce practical margin.
Keep the 3.3 V supply within the specified 3.0 V to 3.6 V range and place the required bypass capacitor directly between VCC and GND. Provide a low-impedance return path for the driver and receiver currents, especially when the bus drives a termination network. Validate the supply with appropriate transient margin rather than relying only on its nominal value, because a disturbed 3.3 V rail can impair receiver thresholds and alter transmitted signal amplitude.
Do not assume that the transceiver's ESD rating replaces correct bus protection. The SN65HVD74D provides more than 12 kV IEC61000-4-2 contact-discharge and more than 30 kV HBM protection, but surge pulses, ground offsets, and long cable environments may require coordinated external protection. Select protection devices with suitable standoff voltage and low capacitance, and verify that added components preserve the intended 20 Mbps signal integrity.
Configure receiver and driver enables deliberately so the bus remains in a defined state during reset, boot, and fault conditions. The SN65HVD74 has separate driver and receiver paths for full-duplex operation, but correct pin states alone do not guarantee a valid system-level bus condition. Review the complete enable logic against the source device's power-up sequence, and confirm that unused logic inputs are never left floating.
Informações de conformidade
The manufacturer product information identifies IEC61000-4-2 and HBM ESD ratings, but no specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status was stated.