THVD1450D - 3.3-5V RS-485 Transceiver ±18kV ESD | TI
N.º de pieza: THVD1450D ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $1.42 | $1,42 |
| 10 | $1.25 | $12,50 |
| 100 | $1.08 | $108,00 |
| 500 | $0.92 | $460,00 |
| 1.000 | $0.79 | $790,00 |
| 2.500 | $0.68 | $1.700,00 |
THVD1450D Descripción general
An RS-485/RS-422 transceiver is a physical-layer interface IC that translates logic-level UART or SPI signals from a microcontroller into the differential voltage signaling required by the RS-485 and RS-422 standards. Differential signaling allows data transmission over long cable runs (up to 1200 m per the RS-485 standard) in electrically noisy industrial environments, because common-mode noise is rejected by the receiver's differential comparator. Within the broader system hierarchy, the transceiver sits between the controller's UART/SPI logic and the physical twisted-pair bus, sitting alongside other power-management and interface ICs on the bus node's BOM.
Key features include ±18-kV HBM-equivalent IEC 61000-4-2 ESD protection on the A and B bus pins, ±4-kV IEC 61000-4-4 EFT immunity, a 30-mV receiver hysteresis for noise rejection, and a wide -40°C to +125°C operating temperature range. The wide 3.0V-5.5V supply range makes the part compatible with both 3.3V and 5V MCU rails without level shifters, while the 1/1 half-duplex configuration is the most common building block for daisy-chained or point-to-point RS-485 nodes.
The device architecture uses a differential line driver with controlled slew rate to limit EMI, and a differential comparator receiver with 30-mV hysteresis to reject bus noise and reflection-induced ringing. The integrated IEC 61000-4-2 ESD cells on the bus pins (tolerant to ±18 kV contact/air discharge) eliminate the need for external TVS protection in most industrial installations, reducing BOM cost and PCB area. The part is part of TI's THVD14xx family, which shares pinout and feature set across data-rate grades.
Typical applications include industrial factory automation, HVAC networks, building-automation RS-485 trunks, motor-control encoder feedback, smart-grid metering, and any embedded system that needs a rugged 3.3V/5V RS-485 node with strong system-level ESD/EFT immunity.
When designing with this device, place 100-nF decoupling capacitors as close as possible to the VCC pin and follow RS-485 cable-stub length recommendations. Note that the wide-supply 3.0V-5.5V range allows direct connection to both 3.3V and 5V MCUs, but the bus common-mode voltage must remain within the -7V to +12V range defined by the standard.
This page synthesizes distributor stock, drop-in alternatives, and practical design notes that complement the manufacturer datasheet with real BOM-level guidance.
Alternativas directas para THVD1450D — 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 THVD1450D (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 →THVD1400D
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
THVD1410D
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
THVD1450D Especificaciones
| Protocol | RS-422, RS-485 |
| Number of Drivers/Receivers | 1/1 |
| Duplex | Half |
| Receiver Hysteresis | 30 mV |
| Maximum Data Rate | 50 Mbps |
| Supply Voltage Range | 3.0 V to 5.5 V |
| ESD Protection (IEC 61000-4-2, bus pins) | ±18 kV (contact/air) |
| EFT Protection (IEC 61000-4-4) | ±4 kV |
| Rango de temperatura de funcionamiento | -40°C to +125°C |
| Encapsulado | 8-pin SOIC (D) |
| Tipo de montaje | Surface Mount |
| Bus Common-Mode Range | -7 V to +12 V |
| Número de pines | 8 |
| Part Status | Active |
| Estado RoHS | Compliant |
Configuración de pines de THVD1450D
| Pin 1 | R — Receiver output (logic-level, referenced to VCC) |
| Pin 2 | RE — Receiver enable, active-low (low = receiver enabled) |
| Pin 3 | DE — Driver enable, active-high (high = driver enabled) |
| Pin 4 | GND — Ground reference |
| Pin 5 | A — Non-inverting bus pin (differential pair) |
| Pin 6 | B — Inverting bus pin (differential pair) |
| Pin 7 | VCC — Supply voltage, 3.0 V to 5.5 V |
| Pin 8 | D — Driver input (logic-level, referenced to VCC) |
Aplicaciones típicas
THVD1450D es adecuado para 6 aplicacións: Industrial Factory Automation, HVAC Network Communications, Motor-Control Encoder Feedback, Smart-Grid Metering Networks, Solar Inverter Communications, Building Access-Control and Security Panels.
Industrial Factory Automation
The THVD1450D is purpose-designed for factory-automation RS-485 trunks where the bus pins must survive routine ESD events from cable handling, charged machinery, and ungrounded equipment. The integrated ±18 kV IEC 61000-4-2 ESD and ±4 kV IEC 61000-4-4 EFT immunity eliminate external TVS arrays, while the wide 3.0-5.5 V supply lets the same transceiver mate directly with 3.3 V Cortex-M MCUs and legacy 5 V PLCs on the same node. With 50 Mbps capability, the part supports high-speed field-bridge links, sensor-refresh buses, and PLC backplanes typical of modern Industry-4.0 cells. Place a 100-nF decoupling capacitor next to pin 7 and follow 120Ω bus termination practice.
Recomendado
HVAC Network Communications
Building-automation RS-485 trunks between rooftop units, air-handlers, and the central BMS controller typically run hundreds of meters through electrically noisy plenums and motor cabinets. The THVD1450D's 30-mV receiver hysteresis rejects motor-commutation noise while the integrated 18 kV ESD protects against static buildup during cable installation. Operating from -40°C to +125°C, the transceiver survives outdoor rooftop enclosures and boiler-room environments. The 3.0-5.5 V supply aligns with the 3.3 V rails common to modern HVAC controllers, removing the need for level-shift circuitry on the bus interface.
Recomendado
Motor-Control Encoder Feedback
Servo and stepper drives require high-speed, noise-immune feedback links between the encoder, drive controller, and upstream PLC. The THVD1450D's 50 Mbps data rate and 30-mV hysteresis preserve encoder pulse edges even on long cable runs near PWM-switched power stages, while the ±18 kV ESD rating protects the bus pins against the static-discharge events common during drive commissioning. The wide 3.0-5.5 V supply lets the transceiver share the drive's 3.3 V logic rail directly, simplifying PCB layout. The -40°C to +125°C rating covers sealed motor-cabinet environments where ambient temperature routinely exceeds 85°C.
Recomendado
Smart-Grid Metering Networks
Smart-meter and distribution-automation networks deploy RS-485 trunks across outdoor low-voltage and medium-voltage installations where bus pins must tolerate contact-discharge events from field technicians. The THVD1450D's integrated IEC 61000-4-2 ±18 kV ESD and IEC 61000-4-4 ±4 kV EFT immunity provide compliance-grade system-level protection per the TI datasheet, reducing the certification burden for meter manufacturers. The wide supply range supports both battery-backed 3.3 V metering MCUs and 5 V line-powered concentrators, while the 50 Mbps data rate handles AMI backhaul traffic and distribution-automation telegrams.
Recomendado
Solar Inverter Communications
Residential and commercial string inverters use RS-485 to daisy-chain optimizer and microinverter nodes back to the gateway over cable runs that can span rooftops and outdoor combiner boxes. The THVD1450D's -40°C to +125°C operating range tolerates rooftop thermal cycling, while the 18 kV IEC ESD rating protects against static discharge during installer handling. The wide 3.0-5.5 V supply mates directly with the inverter's 3.3 V or 5 V logic rail. The 1/1 half-duplex topology matches the standard daisy-chain wiring used by most string-monitoring systems.
Recomendado
Building Access-Control and Security Panels
Access-control and intrusion-detection panels use RS-485 trunks to connect card readers, door controllers, and motion sensors across commercial buildings. The THVD1450D's 30-mV receiver hysteresis and integrated ±18 kV ESD keep the bus reliable despite the cable pulls through plenum spaces and elevator shafts, while the 3.0-5.5 V supply aligns with the 3.3 V logic of modern panel controllers. The 50 Mbps data rate supports high-throughput credential lists and rapid-fire alarm events. The -40°C to +125°C rating covers unheated vestibules and rooftop equipment rooms.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para THVD1450D — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | THVD1450DR | THVD1400D | THVD1410D |
|---|---|---|---|---|
| Package | SOIC-8 (D) | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Maximum Data Rate | 50 Mbps | 50 Mbps | 20 Mbps | 12 Mbps |
| 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 |
| IEC ESD (bus pins) | ±18 kV | ±18 kV | ±18 kV | ±18 kV |
| IEC EFT (bus pins) | ±4 kV | ±4 kV | ±4 kV | ±4 kV |
| Receiver Hysteresis | 30 mV | 30 mV | 30 mV | 30 mV |
| Operating Temperature | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C |
| Duplex / Nodes | Half / 1/1 | Half / 1/1 | Half / 1/1 | Half / 1/1 |
Diferenciadores clave
- Integrated ±18 kV IEC 61000-4-2 ESD on bus pins (frente a THVD1450DR)
- 50 Mbps maximum data rate in SOIC-8 (frente a THVD1400D)
- Highest speed in THVD14xx SOIC-8 family (frente a THVD1410D)
Notas de diseño
Place a 100-nF (minimum) decoupling capacitor as close as possible to the THVD1450D VCC pin (pin 7), with a 10-nF high-frequency bypass cap on the same node. The wide 3.0-5.5 V supply makes the part sensitive to supply transients; bulk decoupling on the rail improves ESD/EFT performance. Use a ground plane under the IC and keep bus-trace stubs shorter than 1/10 of the driver's rise time per RS-485 best practice.
Do not leave DE (pin 3) and RE (pin 2) floating. Both enables must be tied to a defined logic level - DE high enables the driver, RE low enables the receiver. A floating DE pin can cause the driver to spuriously drive the bus during power-up, corrupting data on other nodes. Tie RE to VCC through a 10-kΩ pull-up if the receiver is unused, and DE to GND through a 10-kΩ pull-down if the driver is unused.
Route the differential A/B bus pair as a 100-Ω differential microstrip with matched trace lengths and continuous ground reference. Place 120-Ω termination resistors at the cable ends only - never at stub nodes. Keep the THVD1450D's bus traces away from switching power converter inductors and high-dV/dt signals; even with ±18 kV ESD, the part can be disturbed by adjacent high-frequency noise if layout guidelines are not followed.
Estimated: at the THVD1450D's 50 Mbps maximum data rate, the signal rise time is approximately 5-8 ns. To preserve signal integrity, cable stubs must be kept below ~150 mm (1/10 of the rise-time equivalent length), and the bus termination must be 120 Ω matched to the cable characteristic impedance. Mismatched termination causes reflections that may exceed the receiver's 30-mV hysteresis and cause data errors on long cables.
Información de cumplimiento
RoHS-compliant per TI product page. Industrial temperature grade (-40°C to +125°C) but not AEC-Q100 qualified; for automotive RS-485 nodes consider AEC-Q100-qualified alternatives. IEC 61000-4-2 ±18 kV and IEC 61000-4-4 ±4 kV ratings per TI datasheet.