THVD1452DR - 3.3-5V RS-485 Transceiver, ±18kV ESD, SOIC-14 | TI
MPN: THVD1452DR ✓ Hoạt độngTHVD1452DR Tóm tắt
An RS-485 transceiver is a differential line driver/receiver that converts a single-ended TTL/CMOS logic signal into a balanced differential signal on a twisted-pair bus, and vice versa. RS-485 is the de-facto physical layer for industrial multi-drop communication (e.g., Modbus, PROFIBUS, DMX512, BACnet), valued for its robustness, long cable reach (up to 1200 m at lower speeds), and noise immunity. The THVD1452 family belongs to TI's THVD14xx portfolio of 3.3-V/5-V dual-supply transceivers, sitting within the broader Interface IC hierarchy: line transceiver -> RS-485 transceiver -> differential interface IC -> semiconductor.
Key features of the THVD1452DR include 1/8 unit load (allowing up to 256 devices on the bus), true fail-safe biasing that guarantees a known receiver output when the bus is idle/shorted/open, hot-swap glitch-free bus pins, a wide common-mode range of -7 V to +12 V, and a low quiescent current. Integrated ±18-kV IEC 61000-4-2 ESD eliminates external TVS diodes in many designs, reducing BOM cost and board area for industrial nodes.
The transceiver uses a fully balanced differential architecture with slew-rate-limited driver outputs to reduce EMI. An internal common-mode voltage reference and fail-safe resistors on A/B ensure deterministic receiver output regardless of bus state, while the 1/8 unit-load input impedance allows large multi-drop networks without exceeding the RS-485 32-unit-load minimum. The wide 3.0-5.5 V supply range means the same part can be powered from 3.3-V MCUs or 5-V legacy controllers without level shifters.
Typical applications include factory-automation fieldbus nodes (Modbus RTU, PROFIBUS), building-automation BACnet MS/TP segments, solar inverter daisy-chains, smart-meter AMI networks, motor-drive encoder links, and any industrial I/O link requiring IEC-level ESD immunity. Designers also use it in DMX512 stage-lighting nodes and HVAC damper-actuator networks.
When laying out the THVD1452DR, route the differential A/B pair as a 100-Ω matched impedance, keep the bus stub length below one-tenth of the driver rise time, and place a 100 nF decoupling cap close to VCC. Although the part integrates ±18-kV IEC ESD, a small common-mode choke and a 100 Ω series resistor on each bus pin add extra margin in harsh electrical environments and reduce radiated emissions.
Bộ thay thế dễ dàng lắp đặt cho THVD1452DR — 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 THVD1452DR (cùng hình factor và footprint) — khác nhau ở Package, Protocol, Number of Drivers/Receivers, Operating Temperature, IEC ESD Protection (Bus Pins).
THVD1450DRBR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →THVD1451DR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
THVD1419DR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
THVD1500DR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN65HVD75DR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX3485ESA+T
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →THVD1452DR Thông số kỹ thuật
| Protocol | RS-422 / RS-485 |
| Chức năng | 1/1 Transceiver, full-duplex |
| Number of Drivers/Receivers | 1/1 |
| Supply Voltage (VCC) | 3.0 V to 5.5 V |
| Maximum Data Rate | 50 Mbps |
| IEC ESD Protection (Bus Pins) | ±18 kV air-gap (IEC 61000-4-2); ±8 kV contact |
| HBM ESD Protection | ±16 kV (all pins, HBM) |
| Common-Mode Voltage Range | -7 V to +12 V |
| Bus Unit Load | 1/8 UL (up to 256 nodes) |
| Receiver Fail-safe | True fail-safe (idle/short/open = logic high) |
| Nhiệt độ hoạt động | -40°C to +125°C |
| Hộp | SOIC-14 (D) |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 1 (per TI product page) |
| Trạng thái RoHS | Compliant |
| Lead-free / Halogen-free | Yes / Yes |
| AEC-Q100 Automotive | Not applicable (no -Q1 suffix) |
Cấu hình chân THVD1452DR
| Chân 1 | R — Receiver output (logic-high when bus idle due to fail-safe) |
| Chân 2 | RE# — Receiver enable, active-low; tie to GND to enable output |
| Chân 3 | DE — Driver enable; tie high to drive bus |
| Chân 4 | D — Driver input (TTL/CMOS logic) |
| Chân 5 | B — Inverting bus line |
| Chân 6 | A — Non-inverting bus line |
| Chân 7 | GND — Ground reference |
| Chân 8 | VCC — 3.0 V to 5.5 V supply input |
| Chân 9 | NC — Not connected (per datasheet) |
| Chân 10 | Z — Inverting driver output (full-duplex) |
| Chân 11 | Y — Non-inverting driver output (full-duplex) |
| Chân 12 | SHDN — Shutdown input, active-high; tie to GND for normal operation |
| Chân 13 | VCC — Supply pin (must be tied to pin 8) |
| Chân 14 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
THVD1452DR phù hợp cho 6 Áp dụngs: Industrial Fieldbus Nodes (Modbus RTU / PROFIBUS), Building Automation (BACnet MS/TP / DALI-2), Solar Inverter Daisy-Chain / String Monitoring, Smart Electric Meter (AMI) Communications, Motor Drive Encoder / Servo Feedback Link, DMX512 Stage Lighting Control.
Industrial Fieldbus Nodes (Modbus RTU / PROFIBUS)
The THVD1452DR's 50-Mbps data rate, ±18-kV IEC ESD, and -40°C to +125°C industrial temperature range make it ideal for PLC I/O modules, Modbus RTU slave devices, and PROFIBUS DP segment heads that must survive daily hot-plug events and routine ESD strikes on the bus terminals. Placed between the MCU UART and the shielded twisted pair, with a 100-Ω termination at each end, the device ensures deterministic true-fail-safe receiver outputs and supports up to 256 nodes per segment without an external repeater. Compared with a generic 2.5-Mbps MAX485, the higher bandwidth allows faster scan cycles in time-critical factory-automation applications.
Được đề xuất
Building Automation (BACnet MS/TP / DALI-2)
In BACnet MS/TP building-automation backbones and DALI-2 lighting controllers, the THVD1452DR provides 1/8-unit-load input impedance, allowing up to 256 thermostats, VAV controllers, or luminaires to share a single shielded twisted pair. Its ±18-kV IEC 61000-4-2 ESD eliminates external TVS diodes at the wall-plate connector, and true fail-safe biasing prevents spurious lighting glitches when devices are added to a live bus. The wide 3.0-5.5-V supply range lets the same transceiver serve both 3.3-V ARM Cortex-M0 lighting MCUs and 5-V HVAC controllers with no level shifter.
Được đề xuất
Solar Inverter Daisy-Chain / String Monitoring
Solar microinverter and string-monitor arrays use the THVD1452DR to carry Modbus or proprietary PV-protocol telemetry over RS-485 between panels on a rooftop. The transceiver's ±18-kV IEC ESD survives nearby lightning-induced coupling on the long outdoor bus cable, and its 1/8-unit-load input supports large 200+ inverter farms. The 50-Mbps bandwidth leaves margin for future higher-speed telemetry (e.g., rapid-shutdown diagnostics) without redesigning the communication path. A small CMC plus 100-Ω series resistors near the bus pins add extra margin in high-surge PV installations.
Được đề xuất
Smart Electric Meter (AMI) Communications
Advanced Metering Infrastructure (AMI) concentrators and endpoint meters use the THVD1452DR for utility-grade RS-485 networks, where 1/8-unit-load input permits dense urban meter clusters and ±18-kV IEC ESD tolerates indirect discharge during installation and service. The wide common-mode range of -7 V to +12 V allows long cable runs with significant ground-potential differences between buildings - a common issue in multi-unit residential deployments. True fail-safe receivers avoid phantom polling when a meter is offline, preserving concentrator bandwidth.
Được đề xuất
Motor Drive Encoder / Servo Feedback Link
Servo drives and stepper-motor controllers use the THVD1452DR to transmit high-resolution encoder feedback over RS-485 between the drive and remote controller cabinet. The 50-Mbps data rate comfortably handles 23-bit encoders sampled at 32 kHz, while ±18-kV IEC ESD protects the bus pins from discharges during cabinet commissioning. The 14-pin SOIC footprint is industry-standard and simplifies board layout reuse across multiple motor-drive SKUs in the same product family. Compared with a slower 2.5-Mbps part, the higher bandwidth reduces position-loop latency for high-dynamic-axis machines.
Được đề xuất
DMX512 Stage Lighting Control
Entertainment-lighting fixtures and dimmer racks use the THVD1452DR on DMX512-A daisy-chained links, where 1/8-unit-load input permits up to 256 fixtures per universe and ±18-kV IEC ESD tolerates the static-prone environments of touring racks and stage floors. The 50-Mbps capability far exceeds the 250-kbps DMX512 standard, giving designers headroom for protocol upgrades and future high-speed lighting protocols. True fail-safe receivers prevent stuck-on fixtures when a downstream driver is powered down during a show, a critical safety and artistic-quality consideration.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho THVD1452DR — 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 | THVD1450DR | THVD1451DR | THVD1419DR | THVD1500DR | SN65HVD75DR | MAX3485ESA+T |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Package | SOIC-14 (D) | SOIC-14 (D) - same | SOIC-14 (D) - same | SOIC-14 (D) - same | SOIC-14 (D) - same | SOIC-14 (D) - same | SOIC-14 (S14) - same |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.3 V only | 3.3 V only |
| Maximum Data Rate | 50 Mbps | 500 kbps | 10 Mbps | 5 Mbps | 1 Mbps | 20 Mbps | 10 Mbps |
| Bus Unit Load | 1/8 UL | 1/8 UL | 1/8 UL | 1/4 UL | 1/8 UL | 1/8 UL | 1/8 UL |
| Fail-safe Biasing | True fail-safe | True fail-safe | True fail-safe | True fail-safe | True fail-safe | Standard fail-safe | Standard fail-safe |
| 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 | -40°C to +85°C |
Bảo phân biệt quan trọng
- Higher maximum data rate than other THVD14xx family members (vsTHVD1450DR)
- Tighter unit load for denser multi-drop networks than the THVD1419 (vsTHVD1419DR)
- Higher IEC ESD rating than competing 3.3-V-only parts (vsMAX3485ESA+T)
Ghi chú thiết kế
Route the A/B differential pair as a 100-Ω matched-impedance trace using a 4-layer stack-up with a continuous reference plane; keep the bus stubs shorter than one-tenth of the driver rise time (approximately 5 cm at 50 Mbps) to prevent reflections. Place a 100 nF X7R decoupling capacitor within 2 mm of the VCC pin (pin 8) and add a 10 µF bulk capacitor at the board entry. Avoid running the bus pair beneath switching converters or parallel to clock traces.
The THVD1452DR is full-duplex and exposes Y/Z driver outputs in addition to A/B bus pins; leave Y/Z unconnected on the PCB if only half-duplex operation is needed, or wire them through to A/B if a full-duplex point-to-point link is required. Pin 13 is a redundant VCC and must be tied to the same 3.0-5.5 V rail as pin 8 - leaving it floating can cause erratic bus behavior. Always tie RE# low and DE high for normal driver mode, or RE# low / DE low for normal receive mode.
Although the THVD1452DR integrates ±18-kV IEC 61000-4-2 ESD protection, adding a small common-mode choke (e.g., 100 µH at 100 MHz) and a 100 Ω series resistor on each of the A and B bus pins provides additional margin against surge events and reduces radiated emissions. Place these components as close to the bus connector as possible so the bulk of any conducted disturbance is filtered before reaching the IC. Ensure chassis and signal grounds are bonded at a single point near the bus entry to avoid ground loops.
Thông tin tuân thủ
RoHS compliant per TI product page. Industrial grade only - no AEC-Q100 automotive -Q1 variant offered in this exact part number.
