THVD1451DRBR - 3.3-5V RS-485 Transceiver, ±18kV ESD | TI
N.º de pieza: THVD1451DRBR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $1.78 | $1,78 |
| 10 | $1.55 | $15,50 |
| 100 | $1.18 | $118,00 |
| 500 | $0.99 | $495,00 |
| 1.000 | $0.92 | $920,00 |
| 3.000 | $0.85 | $2.550,00 |
THVD1451DRBR Descripción general
An RS-485 transceiver is a physical-layer interface IC that converts differential bus signals to single-ended logic levels, enabling robust half-duplex or full-duplex serial communication over twisted-pair cabling in electrically noisy industrial environments. RS-485 belongs to the broader TIA/EIA-485 standard family of differential transceivers, used as the physical layer for protocols such as Modbus RTU, PROFIBUS, DMX512, and BACnet. The THVD1451 sits within TI's THVD family, which adds integrated IEC ESD protection that eliminates external TVS diodes in many designs.
Key features include ±18-kV IEC 61000-4-2 contact discharge ESD protection on the bus pins, ±8-kV IEC 61000-4-2 air-gap discharge, ±4-kV EFT, and ±1.5-kV surge (2 Ω source). The device supports up to 50 Mbps signaling rate, features a low standby current of < 5 µA, and offers 1/8 unit-load fanout supporting up to 256 nodes on a single bus. Thermal and fault protection includes thermal shutdown, current limiting on driver outputs, and bus pin fail-safe biasing that keeps the receiver output in a defined state when the bus is floating.
The THVD1451 uses a 3.3 V/5 V CMOS process with precision differential line drivers, achieving low driver skew and rail-to-rail common-mode range from -7 V to +12 V on the bus. The wide common-mode tolerance makes the device tolerant of ground potential differences between nodes in long-cable runs, a defining requirement of the RS-485 standard. The integrated IEC 61000-4-2 ESD protection reduces board area and BOM cost by replacing discrete TVS arrays.
Typical applications include factory automation PLCs, building automation HVAC controllers, solar inverter communication gateways, smart-grid metering, and motor drive encoder feedback links. The wide supply and common-mode ranges also support battery management system (BMS) daisy-chained monitoring where nodes see different ground references.
Design tip: place the THVD1451 as close as possible to the bus connector with a solid ground pour beneath the exposed pad to maximize ESD dissipation. For full ±18-kV IEC contact discharge protection the PCB ground must be low-impedance; a stitching capacitance of 1 nF Y1-rated between bus ground and chassis is recommended.
This page synthesizes distributor pricing, drop-in alternatives and design notes not found in the manufacturer datasheet alone, helping engineers select pin-compatible RS-485 ICs with comparable ESD ratings for industrial and factory-automation designs.
Alternativas directas para THVD1451DRBR — 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 THVD1451DRBR (mismo factor de forma y huella) — difiere en Mounting Type, Package.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
THVD1450DRBR
✅ Sustitución directa✓ En stock
$1.25 / unidad
Ver hoja de datos →THVD1451DRBT
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
THVD1452DRBR
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
THVD1424DRBR
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
SP3485EN-L/TR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
THVD1451DRBR Especificaciones
| Función | RS-485 transceiver (1 driver / 1 receiver) |
| Protocol | RS-485 / RS-422 |
| Supply Voltage Range | 3.0 V to 5.5 V |
| Rango de temperatura de funcionamiento | -40 °C to +125 °C |
| Signaling Rate (Maximum) | 50 Mbps |
| Number of Nodes on Bus | Up to 256 (1/8 unit load) |
| IEC 61000-4-2 Contact Discharge ESD | ±18 kV (bus pins) |
| IEC 61000-4-2 Air-Gap Discharge ESD | ±8 kV (bus pins) |
| IEC 61000-4-4 EFT | ±4 kV |
| Common-Mode Voltage Range | -7 V to +12 V |
| Receiver Input Hysteresis | 30 mV (typical) |
| Standby / Shutdown Current | < 5 µA |
| Encapsulado | VSON-8 (DRB) 3x3 mm with exposed thermal pad |
| Tipo de montaje | Surface Mount |
| MSL Moisture Sensitivity | MSL 1 |
| Estado RoHS | Compliant |
| Número de pines | 8 |
| Duplex | Half-Duplex |
Configuración de pines de THVD1451DRBR
| Pin 1 | R — Receiver data output (push-pull, referenced to logic supply) |
| Pin 2 | RE — Receiver enable, active low (tie low to enable; tie high to put R in high-impedance) |
| Pin 3 | DE — Driver enable, active high (tie high to enable driver; tie low to put bus pins in high-impedance) |
| Pin 4 | D — Driver data input (TTL/CMOS logic referenced to VCC) |
| Pin 5 | GND — Ground reference for both logic and analog circuitry |
| Pin 6 | A/Y — Non-inverting bus pin - driver output, receiver input (differential) |
| Pin 7 | B/Z — Inverting bus pin - driver output, receiver input (differential) |
| Pin 8 | VCC — Power supply input, 3.0 V to 5.5 V; decouple with 100 nF + 1 µF ceramic |
Aplicaciones típicas
THVD1451DRBR es adecuado para 7 aplicacións: Factory Automation PLC Communication, Solar Inverter Modbus Daisy-Chain, Building Automation HVAC Controllers, Battery Management System (BMS) Daisy-Chain, Industrial Encoder and Drive Feedback, Smart-Grid Metering Endpoint Links, LED Lighting DMX512 Control.
Factory Automation PLC Communication
The THVD1451DRBR is an excellent fit for factory-automation PLC communication links because its integrated ±18 kV IEC 61000-4-2 contact ESD eliminates external TVS diodes on the bus, reducing BOM and PCB area. Its 3.0 V to 5.5 V supply supports both 3.3 V micro-PLCs and legacy 5 V backplanes without level shifters. With a 50 Mbps signaling rate and 1/8 unit load (256 nodes), a single bus can fan out to remote I/O blocks, drives and HMI panels over twisted-pair cable. The -7 V to +12 V common-mode range tolerates ground-potential differences between cells that often exceed 10 V in large plants. Estimated: at VCC=5 V and 1 Mbps load, the device draws well below 5 mA in active mode. Engineers should still place a 100 nF decoupling capacitor within 5 mm of the VCC pin and route bus traces symmetrically to keep impedance matched at 120 Ω.
Recomendado
Solar Inverter Modbus Daisy-Chain
The THVD1451DRBR is well suited to solar inverter Modbus daisy-chain monitoring because its ±18 kV integrated IEC ESD protects against installer-induced discharges on the cabinet cable gland. The wide -7 V to +12 V common-mode range tolerates ground-reference drift across many series-connected inverters. Operating across 3.3 V to 5.5 V simplifies interface to either battery-side MCU rails or the inverter's 5 V control plane. The 1/8 unit-load receiver supports long daisy-chains of up to 256 nodes, well beyond the typical 32-node limit. According to TI's application notes, similar THVD parts are used in Sunspec-compliant monitoring networks. Estimated: at 1 Mbps and 5 V supply, active current is around 2-3 mA. Add a 1 nF Y1-rated capacitor between bus ground and chassis for surge path return.
Recomendado
Building Automation HVAC Controllers
The THVD1451DRBR serves building-automation HVAC controller networks because its 3.0 V to 5.5 V supply interfaces cleanly with 24 V-AC-derived 5 V rails typical in HVAC control boards. The integrated ±18 kV IEC ESD withstands installation-time wiring faults and incidental contact discharge during service. With up to 256 nodes on a bus, a single transceiver can backhaul multiple zone controllers, VAV dampers and rooftop units. The half-duplex topology matches the typical BACnet MS-TP / Modbus RTU deployment in commercial buildings. According to TI, this family is widely used in BACnet/IP gateways and chillers controllers. Estimated: at 3.3 V supply, standby current drops below 5 µA meeting low-idle requirements of always-on HVAC nodes. Surge rating of ±1.5 kV also tolerates nearby inductive load switching from contactors.
Recomendado
Battery Management System (BMS) Daisy-Chain
The THVD1451DRBR is appropriate for battery-management daisy-chain communication between stacked battery modules because the wide -7 V to +12 V common-mode range tolerates large ground-potential drift between series-connected cells. The integrated ±18 kV IEC ESD on bus pins protects against hot-swap transients when a module is plugged into a live rack. The 3.3 V to 5.5 V supply matches typical BMS-IC derived rails (e.g., low-dropout regulators from a 12 V cell stack). Half-duplex operation aligns with daisy-chain protocols like TI's daisy-chain or proprietary BMS serial links. Estimated: at 5 V supply and 1 Mbps the part dissipates below 25 mW per node. Designers should keep bus traces short and use twisted-pair cable between modules to maintain 120 Ω characteristic impedance for clean termination.
Recomendado
Industrial Encoder and Drive Feedback
The THVD1451DRBR fits industrial encoder and servo-drive feedback channels because the 50 Mbps signaling rate supports high-resolution dual-channel feedback such as EnDat 2.2, Hiperface DSL or BISS protocols. The ±18 kV IEC ESD protects against accumulated static from long motor cables that can carry substantial capacitive charge. Half-duplex topology simplifies the encoder-only side, eliminating the need for separate full-duplex transceivers. The -40 °C to +125 °C operating range tolerates the elevated ambient temperature inside drive cabinets. According to TI's motor-control documentation, the THVD family is recommended for incremental encoder return lines. Estimated: at 50 Mbps and 5 V supply, driver current peaks around 60 mA during bus transitions. Use 120 Ω termination at both encoder and drive ends for clean signal integrity.
Recomendado
Smart-Grid Metering Endpoint Links
The THVD1451DRBR is also appropriate for smart-grid metering endpoints where each meter communicates back to a data concentrator over RS-485. Its integrated ±18 kV IEC ESD is essential for metering cabinets that experience occasional installer contact or induced transients from substation switching. The 1/8 unit-load receiver (256 nodes per bus) supports dense residential meter clusters sharing one twisted pair. The wide 3.3 V to 5.5 V supply window pairs with the output of battery-backed metering power supplies. According to TI's grid-infrastructure collateral, THVD-family transceivers are designed into AMI / AMR meter gateways worldwide. Estimated: at 3.3 V supply and idle-bus listen mode, standby current remains under 5 µA critical for battery-buffered meters. Add a surge-rated fuse + PTC between bus pins and the meter case for additional field-replaceable protection.
Recomendado
LED Lighting DMX512 Control
The THVD1451DRBR can be used in DMX512 stage- and architectural-lighting control because RS-485 is the physical layer for DMX512-A. The 50 Mbps signaling rate well exceeds the 250 kbps DMX512 requirement, leaving headroom for protocol updates. The integrated ±18 kV IEC ESD protects against stage-installation contact events where fixtures are frequently re-rigged. Half-duplex single-pair topology matches DMX512 differential signaling. The 3.3 V to 5.5 V supply aligns with typical fixture MCU rails. According to TI, the THVD family is widely referenced in commercial-lighting design notes. Estimated: at 5 V supply and 250 kbps the device dissipates below 10 mW per fixture. Use 120 Ω termination at the last fixture in each daisy-chain to absorb reflections and meet DMX512 return-loss spec.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para THVD1451DRBR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | THVD1450DRBR | THVD1451DRBT | THVD1452DRBR | THVD1424DRBR | SP3485EN-L/TR |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | MaxLinear |
| Package | VSON-8 (DRB) 3x3 mm | VSON-8 (DRB) 3x3 mm - same | VSON-8 (DRB) 3x3 mm - same | VSON-8 (DRB) 3x3 mm - same | VSON-8 (DRB) 3x3 mm - same | VSON-8 (DFN) 3x3 mm - same footprint |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V |
| Max Data Rate | 50 Mbps | 50 Mbps | 50 Mbps | 50 Mbps | 20 Mbps | 10 Mbps |
| Number of Nodes (Unit Load) | 256 (1/8 UL) | 256 (1/8 UL) | 256 (1/8 UL) | 256 (1/8 UL) | 256 (1/8 UL) | 32 (1 UL) |
| Common-Mode Range | -7 V to +12 V | -7 V to +12 V | -7 V to +12 V | -25 V to +25 V | -7 V to +12 V | -7 V to +12 V |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +85 °C |
| Unit Price (qty 1, as of 2026-10-10) | $1.78 | $1.55 (estimated, same family tier) | $1.78 (same die, small reel surcharge) | $2.20 (estimated, higher ESD tier) | $1.10 (estimated, lower ESD tier) | $1.10 (estimated, MaxLinear) |
Diferenciadores clave
- Industry-leading integrated IEC 61000-4-2 contact ESD protection (frente a SP3485EN-L/TR (MaxLinear))
- Wide 3.0 V to 5.5 V supply range vs 3.3 V-only competitors (frente a THVD1424DRBR)
- 1/8 unit-load supporting 256 nodes on a single bus (frente a SP3485EN-L/TR)
- 50 Mbps data rate for high-speed protocols (frente a THVD1424DRBR)
Notas de diseño
Place the THVD1451DRBR within 5 mm of the bus connector and use a wide, short trace pair (A/Y and B/Z) of matched length to maintain ~120 Ω differential impedance. According to TI's THVD family datasheet layout recommendations, the bus traces should be routed over an unbroken ground plane to maximize IEC 61000-4-2 ESD dissipation; routed over a power plane increases coupling and reduces robustness. Estimated: a 10 mm un-matched trace adds ~3 dB of attenuation at 50 Mbps; keep bus traces shorter than 30 mm when running at full speed.
Although the VSON-8 DRB package includes an exposed pad (EP) for heat dissipation, the THVD1451DRBR's typical supply current (a few mA in active mode) generates negligible heat. According to TI, thermal shutdown engages only during sustained bus shorts; otherwise the part runs cool with the EP providing mechanical rigidity and a low-inductance ground return. Estimated: at 5 V supply, 10 Mbps and full bus load the part dissipates below 50 mW, well under the device's thermal limit. To improve thermal performance further, solder the EP to a ground copper pour of at least 100 mm² and add four thermal vias.
A common design error is leaving RE floating - according to TI's THVD1451 datasheet the receiver-enable pin has no internal pull and must be tied to a defined logic level (high disables the receiver output). Another pitfall is omitting the 120 Ω termination resistor at the cable ends; without it signal reflections cause inter-symbol interference on long cables, especially at 50 Mbps. When using fail-safe biasing resistors (typically 1.5 kΩ pull-up on A and 1.5 kΩ pull-down on B) verify the bus idle voltage crosses the receiver threshold of -50 mV with margin.
Información de cumplimiento
RoHS and REACH compliance per TI product declaration. Not AEC-Q100 qualified - choose automotive-grade transceivers like TCAN1044 series for vehicle applications. Lead-free and halogen-free per TI's RoHS-compliant DRB package.
