THVD1450 - 50 Mbps RS-485 Transceiver, ±18 kV ESD | Texas Instruments
MPN: THVD1450 ✓ Hoạt độngTHVD1450 Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho THVD1450 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với THVD1450 (cùng hình factor và footprint) — khác nhau ở Package, Product Type, Mounting Type, Duplex Mode, RoHS Status.
THVD1410D
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
THVD1450DRBR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →THVD1450DGKR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
THVD1450DRG4
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX3485ESA+
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →SN65HVD75D
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →SP3485EN-L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →THVD1450 Thông số kỹ thuật
| 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) |
| Khoảng nhiệt độ hoạt động | -40 °C to +125 °C |
| Hộp | 8-SOIC (D) |
| Trạng thái RoHS | Compliant |
| Logic Family Compatibility | 3.3 V and 5 V MCU / UART |
| Hot-Plug Support | Yes (glitch-free power-up) |
Cấu hình chân THVD1450
| Chân 1 | VCC — Supply voltage input (3 V to 5.5 V) |
| Chân 2 | RO — Receiver output (logic-level UART signal to MCU) |
| Chân 3 | DE — Driver enable, active-high input |
| Chân 4 | DI — Driver input (logic-level UART signal from MCU) |
| Chân 5 | GND — Ground reference |
| Chân 6 | A — Non-inverting bus pin (with integrated IEC-ESD cell) |
| Chân 7 | B — Inverting bus pin (with integrated IEC-ESD cell) |
| Chân 8 | VCC — Supply voltage (tied to pin 1 internally on most variants) |
Ứng dụng tiêu biểu
THVD1450 phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho THVD1450 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Integrated ±18-kV IEC 61000-4-2 air ESD on bus pins (vsMAX3485ESA+)
- 256-node unit-load capacity versus 32-node on classic parts (vsMAX3485ESA+)
- Wide 3 V to 5.5 V supply supports both 3.3 V and 5 V logic (vsSN65HVD75D)
- 50 Mbps speed grade versus 500 kbps on slow variants (vsTHVD1410D)
Ghi chú thiết kế
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).
Thông tin tuân thủ
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.
