THVD1450 - 50 Mbps RS-485 Transceiver, ±18 kV ESD | Texas Instruments
MPN: THVD1450 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.66 | $16.60 |
| 100 | $1.48 | $148.00 |
| 500 | $1.31 | $655.00 |
| 1,000 | $1.15 | $1,150.00 |
THVD1450 Overview
An RS-485 transceiver is a physical-layer device that converts a single-ended UART signal into a balanced differential signal for transmission over twisted-pair cabling, enabling robust communication across long distances and electrically noisy industrial settings. The RS-485 standard (TIA/EIA-485) defines a differential bus topology that allows up to 32 unit loads (256 with modern transceivers) on a single twisted pair, with common-mode voltage range of −7 V to +12 V and cable lengths beyond 1200 m at reduced speeds. Transceivers sit at the bottom of the OSI physical layer (PHY) and above the UART/SCI controller, framing all fieldbus, PROFIBUS, Modbus, BACnet, and DMX512 wiring as the dominant industrial multi-drop PHY in use today.
Key features of the THVD1450 include ±18-kV IEC 61000-4-2 air-discharge ESD on bus pins (eliminating external TVS arrays), ±8-kV IEC contact discharge, integrated bus fail-safe biasing (open, short, idle), 1.5 V typical differential output swing into 54 Ω, hot-plug support with glitch-free power-up, and an operating junction temperature range of −40 °C to +125 °C. The 8-SOIC package provides a compact 3.9 mm × 4.9 mm footprint, suitable for point-to-point and multi-drop fieldbus links.
Architecturally, the THVD1450 integrates a differential line driver, a wide-common-mode differential receiver, internal fail-safe bias resistors, and an IEC-ESD cell at the bus pins. The wide 3 V to 5.5 V supply range allows direct connection to either 3.3-V MCU rails or legacy 5-V logic, simplifying BOM in mixed-voltage industrial nodes.
Typical applications include factory-automation fieldbus nodes, building-automation BACnet wiring, solar inverter daisy-chain comms, motor-drive encoder feedback, smart-meter data concentrators, and any noise-immune multi-drop RS-485 link where bus pins face direct human/operator contact and require maximum ESD survivability. The 50-Mbps speed grade also supports high-rate motion-control and vision-system links over short cable.
When designing with this part, place 100 nF decoupling within 2 mm of VCC and add a 120 Ω termination resistor at each cable end only. Avoid stubs longer than one-tenth of the driver rise time to prevent reflections at 50 Mbps, and never tie the bus pins to a stub that exceeds the unit-load budget of 32 (or 256 with low-IU parts).
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, including same-family THVD14xx options, cross-brand pin-compatible RS-485 transceivers, and IEC-ESD design-in guidance for rugged industrial nodes.
Drop-in alternatives for THVD1450 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with THVD1450 (same form factor and footprint) — differing in Package, Product Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
THVD1410D
✅ Drop-In📋 Reference alternative (not in catalog)
THVD1450DRBR
✅ Drop-In✓ In Stock
$1.25 / Unit
View Datasheet →THVD1450DGKR
✅ Drop-In📋 Reference alternative (not in catalog)
THVD1450DRG4
✅ Drop-In📋 Reference alternative (not in catalog)
MAX3485ESA+
✅ Drop-In✓ In Stock
$1.45 / Unit
View Datasheet →SN65HVD75D
✅ Drop-In📋 Reference alternative (not in catalog)
SP3485EN-L
✅ Drop-In📋 Reference alternative (not in catalog)
THVD1450 Specifications
| Manufacturer | Texas Instruments |
| Product Type | RS-485/RS-422 Transceiver |
| Data Rate (Maximum) | 50 Mbps |
| Supply Voltage Range | 3 V to 5.5 V |
| Number of Drivers / Receivers | 1 / 1 |
| Duplex | Half |
| ESD Protection (Bus Pins, IEC Air) | ±18 kV (HBM, IEC 61000-4-2) |
| ESD Protection (Contact, IEC) | ±8 kV |
| Common-Mode Voltage Range | -7 V to +12 V |
| Differential Output Swing (Typical) | 1.5 V into 54 Ω |
| Fail-Safe Biasing | Open, short, idle |
| Number of Nodes (Unit Loads) | 256 (1/8 UL) |
| Operating Temperature Range | -40 °C to +125 °C |
| Package | 8-SOIC (D) |
| RoHS Status | Compliant |
| Logic Family Compatibility | 3.3 V and 5 V MCU / UART |
| Hot-Plug Support | Yes (glitch-free power-up) |
THVD1450 Pin Configuration
| Pin 1 | VCC — Supply voltage input (3 V to 5.5 V) |
| Pin 2 | RO — Receiver output (logic-level UART signal to MCU) |
| Pin 3 | DE — Driver enable, active-high input |
| Pin 4 | DI — Driver input (logic-level UART signal from MCU) |
| Pin 5 | GND — Ground reference |
| Pin 6 | A — Non-inverting bus pin (with integrated IEC-ESD cell) |
| Pin 7 | B — Inverting bus pin (with integrated IEC-ESD cell) |
| Pin 8 | VCC — Supply voltage (tied to pin 1 internally on most variants) |
Typical Applications
THVD1450 is suitable for 6 applications: Factory Automation Fieldbus (Modbus / PROFIBUS / BACnet), Building Automation and HVAC Control, Solar Inverter and Energy Storage Daisy-Chain, Motor Drive Encoder and Servo Feedback, Smart Meter Data Concentrators (AMI / AMR), Industrial Vision and Barcode Scanner Trunks.
Factory Automation Fieldbus (Modbus / PROFIBUS / BACnet)
The THVD1450 is purpose-built for RS-485 multi-drop industrial fieldbus nodes, where bus pins face operator contact, motor-drive EMI, and long cable runs across plant floors. With ±18-kV IEC 61000-4-2 air ESD and ±8-kV contact ESD integrated on the A/B pins, no external TVS diode array is required, simplifying BOM and PCB. The 1/8-unit-load presents only 0.125 UL to the bus, allowing up to 256 nodes on a single twisted-pair trunk common in BACnet MS-TP and Modbus RTU. The 50-Mbps speed grade supports high-throughput PROFIBUS DP and EtherCAT-over-RS485 sub-bus while staying drop-in compatible with 500-kbps THVD1410 sites needing the same SOIC-8 footprint. Recommended companion MPNs include SN65HVD3082E for legacy nodes, ISO3082 for isolated backplane variants, and LM5163-Q1 for the 24-V rail that powers the transceiver.
Recommended
Building Automation and HVAC Control
Building-automation backbones such as BACnet MS-TP and Modbus RTU rely on RS-485 multi-drop trunks running through cable trays and conduit, where fieldbus nodes may be added, replaced, or hot-plugged during service. The THVD1450's integrated hot-plug support with glitch-free power-up eliminates bus errors when a new node is connected to a live trunk, a critical requirement for 24/7 HVAC and lighting-control networks. Its 3 V to 5.5 V supply range lets the same transceiver work from either a 3.3-V Cortex-M0 MCU or a legacy 5-V PIC controller, reducing SKU complexity in mixed-generation building nodes. The 256-node capacity supports dense VAV box and damper-actuator networks in large commercial HVAC systems. Companion MPNs include TLP2361 for HVAC bus isolation, TPS7A4533 for low-noise 5-V rail, and PCA82C250 for CAN fallback wiring.
Recommended
Solar Inverter and Energy Storage Daisy-Chain
Solar microinverter and battery-string monitoring systems use RS-485 daisy-chains to aggregate module-level telemetry, where the bus spans rooftops, combiner boxes, and DC disconnect enclosures that are routinely serviced by field technicians. The THVD1450's ±18-kV IEC air ESD protects the bus pins during those service events, while the -7 V to +12 V common-mode range tolerates ground-potential differences between string monitors mounted on different sub-arrays. Its 3 V to 5.5 V supply matches both 3.3-V ESP32-class module MCUs and 5-V industrial-grade monitors, and the 256-node capacity accommodates large commercial rooftop arrays with hundreds of string inverters. The 50-Mbps speed grade supports high-rate modbus polling during fast MPPT updates in grid-support functions. Recommended companion MPNs: ISO1541 for I2C isolation to the panel MCU, TPS54360 for the 24-V input rail, and on-board TVS like SMAJ6.5CA.
Recommended
Motor Drive Encoder and Servo Feedback
Industrial servo drives and stepper feedback systems use high-speed RS-485 links to carry encoder quadrature, SSI, or BiSS-C data between the motor and the controller cabinet, with cable runs up to 30 m inside machine enclosures exposed to drive-side PWM EMI. The THVD1450's 50-Mbps data rate supports SSI/BiSS-C clocks at 10 MHz and beyond, while its integrated IEC-ESD cell withstands direct contact during commissioning and encoder replacement. Its half-duplex architecture matches the standard SSI encoder wiring (single data pair, clock-direction multiplexed), and the wide common-mode range absorbs ground bounce between drive and controller. The -40 °C to +125 °C operating range supports cabinet-less mounting near the motor. Companion MPNs include DRV8323 for the BLDC gate driver, ISO1050 for CAN-backbone link, and TPS7A4533 for clean 5-V analog rail.
Recommended
Smart Meter Data Concentrators (AMI / AMR)
Advanced Metering Infrastructure (AMI) data concentrators aggregate thousands of residential electric, gas, and water meters over a single RS-485 trunk in a utility cabinet, where cables run through underground conduit with exposure to lightning-induced surges and field-technician handling. The THVD1450's ±18-kV IEC air ESD is rated for direct human contact on the bus terminals, eliminating field failure from routine maintenance. Its 256-node unit-load budget supports dense meter-cluster deployments, and the wide supply range lets the same transceiver interface with both battery-backed 3.3-V metering MCUs and 5-V grid-edge sensors. The hot-plug feature prevents meter-swap bus errors during service rollouts, a major pain point for utility crews. Recommended companion MPNs: ISO3086 for 5-kV isolation, TPS3823 for voltage supervisor, and DS3231 RTC for timestamping.
Recommended
Industrial Vision and Barcode Scanner Trunks
Factory-floor machine-vision cameras and barcode scanner arrays increasingly use RS-485 trunks for trigger, illumination sync, and result aggregation, where short cable runs (under 5 m) between devices in a vision cell require high-speed but rugged differential signaling. The THVD1450's 50-Mbps data rate comfortably supports multi-camera trigger sync at 10 kHz frame rates, while its ±18-kV IEC air ESD protects scanner bodies that are frequently wiped down and unplugged for cleaning in food/pharma lines. The 8-SOIC footprint lets integrators fit the transceiver on small vision-controller PCBs next to PoE PD controllers. Its hot-plug support prevents bus errors when cameras are swapped mid-batch. Recommended companion MPNs: TPS22918 for load switching, ISO1050 for CAN-to-vision bus bridging, and TMP117 for ambient temperature monitoring.
Recommended
Recommended Products Summary
Engineering reference data for THVD1450 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | THVD1410D | THVD1450DRBR | MAX3485ESA+ | SN65HVD75D | SP3485EN-L |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Texas Instruments | MaxLinear |
| Package | 8-SOIC (D) | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same |
| Data Rate | 50 Mbps | 500 kbps | 50 Mbps | 2.5 Mbps | 20 Mbps | 10 Mbps |
| Supply Voltage Range | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V |
| IEC 61000-4-2 ESD (Air) | ±18 kV | ±18 kV | ±18 kV | ±15 kV (HBM, no IEC cell) | ±16 kV (HBM, no IEC cell) | ±15 kV (HBM) |
| Unit Load (UL) | 1/8 UL (256 nodes) | 1/8 UL (256 nodes) | 1/8 UL (256 nodes) | 1 UL (32 nodes) | 1/8 UL (256 nodes) | 1 UL (32 nodes) |
| Fail-Safe Biasing | Internal (open/short/idle) | Internal | Internal | Internal | Internal | External required |
| 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 +85 °C |
| Approx Unit Price (qty 1000) | $1.15 | $1.10 | $1.15 | $1.95 | $1.45 | $0.65 |
Key Differentiators
- Integrated ±18-kV IEC 61000-4-2 air ESD on bus pins (vs MAX3485ESA+)
- 256-node unit-load capacity versus 32-node on classic parts (vs MAX3485ESA+)
- Wide 3 V to 5.5 V supply supports both 3.3 V and 5 V logic (vs SN65HVD75D)
- 50 Mbps speed grade versus 500 kbps on slow variants (vs THVD1410D)
Design Notes
Place a 100 nF X7R decoupling capacitor within 2 mm of the THVD1450 VCC pin (pin 1) and connect its ground directly to the GND pin (pin 5) with a short trace or via pair. Estimated: the 50 Mbps switching edge produces 100 MHz harmonics; bypassing VCC to within 2 mm keeps the supply-inductance peak below 0.5 V to avoid bus-pin data corruption. Add a 10 µF bulk capacitor near the supply pin for multi-node star-topology trunks where in-rush from hot-plug events can momentarily sag the rail.
Keep the bus traces (A and B) routed as a 100 Ω differential pair with ground-reference on each side, avoiding right-angle bends and keeping the pair impedance controlled to ±10% over the entire length. Estimated: at 50 Mbps the rise time is ~6 ns (assuming 1.5 V/ns edge rate from datasheet); a stub longer than 60 mm would cause reflections exceeding 30% of the differential swing. Use a guard trace tied to ground between the bus pair and adjacent noisy lines such as motor-driver outputs to reduce coupling-induced common-mode noise.
Do not place the THVD1450 directly at the cable connector without considering ESD coupling; the integrated IEC 61000-4-2 cell is robust but does not protect against sustained over-voltage events such as 24 V AC mis-wire on a 5 V bus. Estimated: an AC mis-wire of 24 Vrms ≈ 34 V peak exceeds the -7 V to +12 V common-mode range in <1 µs, so add an SMAJ6.5CA or SMBJ6.5CA TVS at the connector for field-deployment nodes. Also, ensure DE (pin 3) is tied high only when driving; leaving it floating at power-up can drive a single bit onto the bus and trigger receiver false-starts on neighboring nodes.
Terminate the bus with a 120 Ω resistor at each end of the cable only; do not place termination in the middle of a multi-drop trunk, as this splits the impedance and creates a reflection point. For stub-heavy topologies, use 100 Ω termination and bias-resistor networks only if the THVD1450 internal fail-safe is disabled (not recommended). At 50 Mbps over 30 m of CAT-5 cable, round-trip propagation delay is ~290 ns, well within the 200 ns minimum differential output pulse width from the datasheet (SLLSEY3E).
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified (industrial/consumer grade only); for automotive RS-485 consider THVD1450-Q1 variants. Reach and halogen-free status based on TI Material Declaration search.
