THVD1452D - 3.3-5V RS-485 Transceiver, ±18kV IEC ESD | TI
N.º de pieza: THVD1452D ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $2.45 | $2,45 |
| 10 | $2.18 | $21,80 |
| 100 | $1.85 | $185,00 |
| 500 | $1.62 | $810,00 |
| 1.000 | $1.38 | $1.380,00 |
| 2.500 | $1.21 | $3.025,00 |
THVD1452D Descripción general
An RS-485 transceiver is a differential line driver/receiver IC designed for robust, long-distance, half- or full-duplex serial communication over twisted-pair cabling. RS-485 transceivers belong to the interface IC family within the broader semiconductor hierarchy (interface IC -> communication transceiver -> differential bus transceiver -> semiconductor). They convert single-ended TTL/CMOS logic levels into differential signals compliant with the TIA/EIA-485 standard, enabling multi-drop networks of up to 32 unit loads on a single bus segment with excellent immunity to common-mode noise.
Key features of the THVD1452D include ±18-kV IEC 61000-4-2 ESD protection on the bus pins (HBM ±16 kV, contact discharge ±6 kV), a 1/8 unit-load receiver input impedance allowing up to 256 nodes on the bus, true fail-safe biasing on the receiver outputs, and integrated IEC 61000-4-4 EFT protection. The device operates across the industrial -40 °C to +125 °C temperature range and provides thermal shutdown with automatic recovery.
The architecture combines a precision differential line driver with a wide-common-mode receiver that detects signals as low as ±200 mV in the presence of ±25 V common-mode voltage. This robust receiver design eliminates the need for external fail-safe resistors and supports reliable operation in electrically noisy industrial environments such as motor inverters and HVAC equipment.
Typical applications include factory automation networks, motor drive position feedback, building automation (HVAC, lighting, access control), solar inverter communications, and any point-to-point or multi-drop RS-485 link requiring strong system-level ESD/EFT robustness without external protection components.
When designing with the THVD1452D, place the bus pins' decoupling capacitor as close as possible to VCC (pin 13) and route the differential A/B traces as a 100-Ω differential pair with ground reference. Use a 120 Ω resistor across A and B at the cable ends for termination.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Alternativas directas para THVD1452D — 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 THVD1452D (mismo factor de forma y huella) — difiere en Common-Mode Voltage Range, HBM ESD Protection, IEC ESD Protection (Bus Pins), Number of Drivers/Receivers, Operating Temperature.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
THVD1452DR
✅ Sustitución directa✓ En stock
$0.54 / unidad
Ver hoja de datos →THVD1452DG4
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
THVD1452D
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$1.21 / unidad
Ver hoja de datos →MAX3485ESA
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
SP485E-L
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ST3485EIDR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
THVD1452D Especificaciones
| Protocol | RS-485 |
| Number of Drivers/Receivers | 1/1 (Full-duplex) |
| Supply Voltage (VCC) | 3.0 V to 5.5 V |
| IEC ESD Protection (Bus Pins) | ±18 kV (IEC 61000-4-2 air discharge) |
| HBM ESD Protection | ±16 kV |
| Contact Discharge ESD | ±6 kV |
| IEC EFT Protection | Per IEC 61000-4-4 |
| Receiver Input Impedance | 1/8 unit load (≥ 96 kΩ) |
| Maximum Bus Nodes | 256 |
| Common-Mode Voltage Range | ±25 V |
| Fail-Safe Receiver | Yes (open, short, idle-bus) |
| Temperatura de funcionamiento | -40 °C to +125 °C |
| Encapsulado | 14-pin SOIC (D) |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
| Apagado térmico | Yes (with auto recovery) |
Configuración de pines de THVD1452D
| Pin 1 | R — Receiver output (to MCU UART RX) |
| Pin 2 | RE — Receiver enable, active-low (tie low to enable) |
| Pin 3 | DE — Driver enable, active-high (tie high to enable) |
| Pin 4 | D — Driver input (from MCU UART TX) |
| Pin 5 | GND — Ground |
| Pin 6 | Y — Driver non-inverting output (to bus) |
| Pin 7 | Z — Driver inverting output (to bus) |
| Pin 8 | GND — Thermal pad / Ground |
| Pin 9 | NC — Not connected (per datasheet) |
| Pin 10 | A — Receiver non-inverting input (from bus) |
| Pin 11 | B — Receiver inverting input (from bus) |
| Pin 12 | NC — Not connected (per datasheet) |
| Pin 13 | VCC — Supply voltage, 3.0 V to 5.5 V |
| Pin 14 | NC — Not connected (per datasheet) |
Aplicaciones típicas
THVD1452D es adecuado para 6 aplicacións: Factory Automation Networks, Motor Drive Position Feedback, Building Automation and HVAC, Solar Inverter Communications, Access Control and Security Panels, Point-to-Point Full-Duplex Industrial Links.
Factory Automation Networks
The THVD1452D is purpose-built for factory automation RS-485 links between PLCs, distributed I/O blocks, and remote sensor/actuator nodes. Its ±18-kV IEC 61000-4-2 ESD and IEC 61000-4-4 EFT immunity eliminate external TVS components, allowing direct connection to cabling routed through electrically noisy motor cabinets and welding equipment. The 1/8 unit-load receiver supports up to 256 nodes per bus, meeting the high device count typical of large assembly lines. With 3.0-V to 5.5-V supply compatibility, the device interfaces directly to both legacy 5-V PLC backplanes and modern 3.3-V industrial MCUs.
Recomendado
Motor Drive Position Feedback
In variable-frequency drives and servo amplifiers, the THVD1452D provides the RS-485 link between the motor controller and absolute encoder feedback (EnDat, BiSS, or proprietary protocols). The ±25-V common-mode range and industrial -40 °C to +125 °C temperature rating tolerate the high dV/dt switching noise from IGBT/MOSFET power stages. Integrated thermal protection with auto recovery prevents catastrophic failures during short-circuit events at the motor terminals. Place the THVD1452D inside the drive control board with the differential pair routed to an isolated gateway for safe encoder data transmission back to the system controller.
Recomendado
Building Automation and HVAC
Building management systems (BMS) rely on RS-485 multi-drop networks to interconnect HVAC controllers, lighting ballasts, and access control panels across floors and zones. The THVD1452D's 256-node capacity and true fail-safe receiver allow large fan-coil-unit networks to share a single twisted-pair backbone, reducing cabling costs dramatically. ±18-kV ESD withstands installer handling and static discharge during commissioning. Operating from -40 °C to +125 °C ensures reliability in unconditioned rooftop equipment rooms and outdoor enclosures where HVAC controllers are deployed.
Recomendado
Solar Inverter Communications
Photovoltaic inverter arrays use RS-485 to communicate Modbus RTU between string inverters, the data acquisition unit, and the cloud gateway. The THVD1452D's wide 3.0-V to 5.5-V supply range allows direct connection to the inverter's 3.3-V control logic, while ±18-kV ESD protects against the high-voltage transients typical of solar DC-side switching. The full-duplex topology supports simultaneous Modbus polling of multiple inverter slaves on a four-wire bus. Industrial temperature grade ensures reliable operation in outdoor combiner boxes exposed to direct sunlight and weather extremes.
Recomendado
Access Control and Security Panels
Card readers, electric door locks, and alarm panels interconnect over RS-485 to central security controllers in commercial and institutional buildings. The THVD1452D's robust ±18-kV ESD withstands field-install mishandling, and its fail-safe receiver prevents false alarm states when cables are disconnected. With up to 256 nodes per bus, a single THVD1452D-equipped controller can manage an entire building's worth of access points. The 14-pin SOIC package fits easily into compact reader housings and provides industrial temperature tolerance for outdoor gate controllers.
Recomendado
Point-to-Point Full-Duplex Industrial Links
For four-wire point-to-point RS-485 connections between remote sensors, weigh scales, or flow meters and their host controller, the THVD1452D provides full-duplex communication on separate Y/Z and A/B differential pairs. This eliminates the bus arbitration overhead of half-duplex protocols and allows simultaneous bidirectional data transfer, doubling effective throughput. The ±25-V common-mode tolerance supports ground-potential differences typical in distributed installations where equipment spans different buildings or power phases. The integrated IEC protection makes the link robust to lightning-induced surges on outdoor cables.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para THVD1452D — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | THVD1452DR | THVD1452DG4 | MAX3485ESA | SP485E-L | ST3485EIDR |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | MaxLinear | STMicroelectronics |
| Package | 14-pin SOIC (D) | 14-pin SOIC (D) - same | 14-pin SOIC (D) - same | 14-pin SOIC - same | 14-pin SOIC - same | 14-pin SOIC - same |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.3 V nominal | 5 V nominal | 3.3 V nominal |
| IEC ESD Protection | ±18 kV | ±18 kV | ±18 kV | ±15 kV | ±15 kV | ±8 kV |
| Receiver Input Impedance | 1/8 unit load (256 nodes) | 1/8 unit load (256 nodes) | 1/8 unit load (256 nodes) | 1 unit load (32 nodes) | 1 unit load (32 nodes) | 1 unit load (32 nodes) |
| Fail-Safe Receiver | Yes (integrated) | Yes | Yes | Yes | Yes | Yes |
| Topology | Full-duplex (1/1) | Full-duplex | Full-duplex | Full-duplex | Full-duplex | Full-duplex |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +125 °C |
Diferenciadores clave
- Integrated ±18 kV IEC 61000-4-2 ESD on bus pins (frente a MAX3485ESA)
- 1/8 unit-load receiver supports 256 bus nodes (frente a ST3485EIDR)
- Wide 3.0 V to 5.5 V single-supply range (frente a SP485E-L)
Notas de diseño
Route the differential A/B and Y/Z bus traces as a 100-Ω differential pair with ground reference, keeping trace length matched within 5 mm to preserve signal integrity. Place the VCC decoupling capacitor (100 nF ceramic) directly at pin 13 and a 10 µF bulk capacitor within 5 mm. Maintain at least 3 mm clearance between the bus traces and any switching-node traces to prevent capacitive coupling. The exposed thermal pad (pin 8) must be soldered to a ground copper pour for reliable thermal performance.
For multi-drop buses, place a 120 Ω termination resistor across A and B at each end of the bus backbone - never at intermediate nodes. The fail-safe biasing integrated in the THVD1452D eliminates external pull-up/pull-down resistors on A and B. Twisted-pair cable with characteristic impedance near 100 Ω is recommended; shielded cable (STP) is preferred in high-EMI motor-drive installations. Maximum stub length from backbone to transceiver should not exceed one-tenth of the driver's rise time times propagation velocity.
Do not exceed the absolute maximum common-mode voltage of ±25 V on bus pins - during installation, ESD events, or ground-potential-rise conditions, transient suppressors may be required for outdoor runs. Tie the DE and RE pins together for simplex half-duplex operation only when needed; otherwise leave DE high and RE low for full-duplex. Avoid hot-plugging the THVD1452D into a live bus without proper precharge - this can cause large inrush currents and false starts of slaves on the network.
Estimated: at 5 V supply, 1-Mbps full-duplex operation, 50% bus load, the THVD1452D draws approximately 5 mA typical supply current. With 3.3 V supply the current increases to ~7 mA due to higher driver output stage losses. No external LDO is required if the system rail already provides a clean 3.3 V or 5 V source; an RC filter (10 Ω + 100 nF) at the VCC pin is recommended when the device shares its supply with a switching regulator.
Información de cumplimiento
RoHS and REACH compliant per TI product page. Standard THVD1452D is not AEC-Q100 qualified - select the THVD1452DTQ1 automotive variant for vehicle applications. IEC 61000-4-2 ESD and IEC 61000-4-4 EFT immunity ratings per TI datasheet.
