SN65HVD73DGS - 3.3V Full-Duplex RS-485 20Mbps | Texas Instruments
MPN: SN65HVD73DGS ✓ Hoạt độngSN65HVD73DGS Tóm tắt
A RS-485 transceiver is a balanced differential line driver/receiver IC that converts a single-ended TTL/CMOS logic signal into a differential signal conforming to the TIA/EIA-485-A standard, enabling robust multi-drop communication over twisted-pair cable with common-mode voltage tolerance up to ±25 V and cable lengths up to 1200 m at reduced data rates. RS-485 transceivers sit within the broader hierarchy of interface ICs, bridging UART/MCU logic with physically robust fieldbus wiring. The SN65HVD73DGS belongs to the 3.3 V HVD7x family, which the manufacturer offers in both SOIC and small-footprint MSOP/VSSOP packages for space-constrained designs.
Key features include 12 kV IEC 61000-4-2 ESD protection on bus pins (HBM and contact discharge), 20 Mbps signaling rate for Profibus and high-speed fieldbus use, 1/8 unit-load receiver input impedance for up to 256 nodes on a single bus, and separate driver/receiver enable pins for half-duplex reuse even though the device is full-duplex. The receiver failsafe design guarantees a logic-high output when the bus is idle, shorted, or terminated but undriven. The bus pins survive ±25 V common-mode transients common in industrial environments.
Architecturally, the SN65HVD73DGS uses a 3.3 V CMOS core with a symmetric differential driver output stage and a wide-common-mode differential receiver, internally synchronized to share a single 3.3 V supply rail. The driver slew rate is optimized for 20 Mbps NRZ signaling, and the receiver hysteresis (typically 50 mV) ensures noise-immune operation over long cables. Internal ESD cells provide IEC-level protection without external TVS diodes in most applications.
Typical applications include industrial fieldbus networks (Modbus RTU, Profibus DP, DMX512), motor-drive encoder feedback, solar inverter daisy-chain communication, building automation (BACnet MS/TP), and any 3.3 V logic node that must communicate over a long, electrically noisy cable. Pairing with a TVS diode such as SMAJ33CA extends transient protection beyond 12 kV.
When designing with this part, ensure the bus is terminated with a 120 Ω resistor at each end and that stubs are minimized to preserve signal integrity at 20 Mbps. The active-high DE and active-low RE pins allow independent control of driver and receiver, supporting direction-switching protocols as well as fail-safe shutdown during bus faults. Decouple VCC with a 0.1 µF ceramic capacitor placed within 5 mm of the supply pin.
Bộ thay thế dễ dàng lắp đặt cho SN65HVD73DGS — 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 SN65HVD73DGS (cùng hình factor và footprint) — khác nhau ở Package, Product Type, Operating Temperature Range, Supply Voltage (VCC).
SN65HVD73DGSR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →SN65HVD73DR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN65HVD1476DGSR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX3485ESA+T
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ISL3179EFRZ-T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SP3070EEN-L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN65HVD73DGS Thông số kỹ thuật
| Protocol | RS-422, RS-485 |
| Number of Drivers/Receivers | 1/1 |
| Duplex | Full |
| Supply Voltage (VCC) | 3 V to 3.6 V |
| Tốc độ dữ liệu | 20 Mbps (max) |
| ESD Protection (Bus Pins) | 12 kV IEC 61000-4-2 contact discharge |
| Receiver Input Impedance | 1/8 unit load (up to 256 nodes) |
| Common-Mode Voltage Range | -7 V to +12 V |
| Driver Enable | Yes, active-high (DE pin) |
| Receiver Enable | Yes, active-low (RE pin) |
| Nhiệt độ hoạt động | -40 °C to +125 °C |
| Hộp | 10-VSSOP (DGS) 3.0 mm × 3.0 mm |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 2 |
| Trạng thái RoHS | Compliant |
Cấu hình chân SN65HVD73DGS
| Chân 1 | VCC — 3.3 V supply input |
| Chân 2 | GND — Ground |
| Chân 3 | R — Receiver output (logic-level, referenced to GND) |
| Chân 4 | RE — Receiver enable (active-low) |
| Chân 5 | DE — Driver enable (active-high) |
| Chân 6 | D — Driver input (logic-level, referenced to GND) |
| Chân 7 | GND — Ground |
| Chân 8 | Y — Driver non-inverting differential output |
| Chân 9 | Z — Driver inverting differential output |
| Chân 10 | A/B — Receiver differential input pair (A non-inverting, B inverting) |
Ứng dụng tiêu biểu
SN65HVD73DGS phù hợp cho 7 Áp dụngs: Industrial Profibus DP Fieldbus Networks, Solar Inverter Daisy-Chain Communication, Motor Drive Encoder Feedback Link, Building Automation (BACnet MS/TP), DMX512 Stage Lighting Control, Point-to-Point High-Speed Data Link, Industrial Sensor Networks (Modbus RTU).
Industrial Profibus DP Fieldbus Networks
The SN65HVD73DGS delivers 20 Mbps signaling required for Profibus DP segments and other high-speed industrial fieldbus protocols operating over RS-485. Its 12 kV IEC 61000-4-2 ESD on bus pins tolerates direct cable discharge events common in factory-floor installation, while the 1/8 unit-load input impedance allows up to 256 nodes per segment - far exceeding classic 32-node limits. Used between a 3.3 V MCU UART and a Profibus DP slave ASIC, with DE/RE pins for direction switching in point-to-point or small multi-drop installations. A 120 Ω termination at each end and a 1 nF biasing network completes the segment per TI datasheet reference design.
Được đề xuất
Solar Inverter Daisy-Chain Communication
Solar inverters and microinverters use RS-485 daisy-chains to report telemetry to a central gateway over long rooftop cable runs. The SN65HVD73DGS supports up to 256 nodes per bus - critical for large commercial arrays - while surviving ±25 V common-mode transients from inverter switching. Placed between a 3.3 V STM32 or PIC UART and the daisy-chain cable, with SMAJ33CA TVS for surge protection beyond 12 kV. The 20 Mbps rate enables future migration to higher-speed monitoring protocols without redesigning the transceiver stage.
Được đề xuất
Motor Drive Encoder Feedback Link
Servo drives and stepper motor controllers use RS-485 to communicate absolute encoder position data back to the controller at high speed. The SN65HVD73DGS handles the 20 Mbps data rate required for 23-bit encoders at multi-kHz update rates, and its -40°C to +125°C operating range survives the hot environment inside a sealed drive enclosure. Placed between the encoder interface ASIC and the controller UART, with isolated DC-DC and digital isolators providing 5 kV galvanic isolation per TI drive reference designs. Receiver failsafe biasing eliminates false trips during encoder power-up.
Được đề xuất
Building Automation (BACnet MS/TP)
BACnet MS/TP building automation networks run at 9.6 kbps to 76.8 kbps over RS-485, but the SN65HVD73DGS's 20 Mbps capability future-proofs designs for faster BACnet/IP or wired-MQTT uplinks. Its 256-node capacity supports large commercial HVAC installations with hundreds of VAV boxes, while the VSSOP-10 footprint fits on the small controller PCBs typical of thermostats and fan-coil units. The 12 kV ESD prevents field-failure from installer cable discharge events that are common in building commissioning.
Được đề xuất
DMX512 Stage Lighting Control
DMX512 entertainment lighting runs at 250 kbps over RS-485, but the SN65HVD73DGS's 1/8 unit-load impedance enables very large dimmer-pack installations - up to 256 receivers per universe. Its 12 kV ESD tolerates cable-handling discharge on stage crews, and the VSSOP-10 package fits in compact moving-light yoke designs. Placed between a 3.3 V Cortex-M0 DMX transmitter IC and the XLR connector, with proper grounding and a 120 Ω termination at the final dimmer per DMX512-A standard.
Được đề xuất
Point-to-Point High-Speed Data Link
Industrial machine vision cameras and remote sensor heads often use RS-485 full-duplex as a low-cost alternative to Ethernet for short, high-speed data links (up to 20 Mbps over 30-50 m). The SN65HVD73DGS's full-duplex topology and separate DE/RE enable pins simplify point-to-point firmware by allowing concurrent transmit/receive, while its 3.3 V supply directly interfaces to camera image sensors and SoCs without level shifting. The 10-VSSOP footprint is small enough to fit alongside image sensors on a compact camera head PCB.
Được đề xuất
Industrial Sensor Networks (Modbus RTU)
Modbus RTU remains the most widely deployed industrial sensor protocol at 9.6 kbps to 115.2 kbps over RS-485. The SN65HVD73DGS supports a Modbus segment with up to 256 sensor nodes thanks to its 1/8 unit-load input impedance - critical for dense PLC rack installations where each I/O module is a bus node. The 12 kV ESD prevents failures during cabinet commissioning when cables are frequently hot-plugged. Placed between a 3.3 V Cortex-M4 Modbus master and a 120 Ω terminated bus with biasing resistors per Modbus over Serial Line Specification.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho SN65HVD73DGS — 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 | SN65HVD73DGSR | SN65HVD73DR | SN65HVD1476DGSR | MAX3485ESA+T | ISL3179EFRZ-T | SP3070EEN-L |
|---|---|---|---|---|---|---|---|
| Package | 10-VSSOP (DGS) | 10-VSSOP (DGS) | SOIC-8 | 10-VSSOP (DGS) | SOIC-8 | DFN-10 | SOIC-14 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Renesas Electronics | MaxLinear |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V |
| Data Rate | 20 Mbps | 20 Mbps | 20 Mbps | 50 Mbps | 10 Mbps | 20 Mbps | 250 kbps |
| Receiver Unit Load | 1/8 (256 nodes) | 1/8 (256 nodes) | 1/8 (256 nodes) | 1/8 (256 nodes) | 1 (32 nodes) | 1/8 (256 nodes) | 1/8 (256 nodes) |
| Driver/Receiver Enable | DE + RE pins | DE + RE pins | DE + RE pins | DE + RE pins | DE + RE pins | DE + RE pins | DE + RE pins |
| 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 +85 °C | -40 °C to +125 °C | -40 °C to +85 °C |
| Unit Price (qty 1) | $3.05 | $3.05 | $3.20 | $4.50 | $2.40 | $3.40 | $2.10 |
Bảo phân biệt quan trọng
- Industry-high 1/8 unit load with full 20 Mbps data rate (vsMAX3485ESA+T)
- 12 kV IEC ESD on bus pins with small 10-VSSOP footprint (vsSN65HVD1476DGSR)
- Active-high DE and active-low RE for direction control (vsSN65HVD71DGS)
Ghi chú thiết kế
Place the 0.1 µF VCC decoupling capacitor within 5 mm of the SN65HVD73DGS supply pin (pin 1) with a direct ground via to the ground plane. Keep the bus traces (Y, Z, A, B) matched in length and impedance-controlled at 120 Ω differential to minimize reflection at 20 Mbps. Avoid routing bus traces near switching power or motor drive signals to prevent common-mode noise injection.
The DE and RE pins have specific logic-level thresholds that are NOT 5 V tolerant on the 3.3 V SN65HVD73. If your MCU GPIO is 5 V, level-shift DE/RE/D/R signals to 3.3 V before connecting, or use a 3.3 V MCU directly. Failing to do this will damage the enable inputs over time. Also note that RE is active-low - a logic-high on RE puts the receiver in high-impedance, not enabled.
For 20 Mbps operation over long cables, terminate the bus with a 120 Ω resistor at each end only. Adding intermediate terminations or stubs longer than 1/10 of the rise time (~1.5 ns at 20 Mbps) will cause reflections and bit errors. If the bus must branch, use a stub length less than 0.15 m at 20 Mbps or reduce the data rate to 1 Mbps to allow longer stubs.
The SN65HVD73DGS draws approximately 1 mA quiescent current when both driver and receiver are enabled, and rises to ~15 mA when actively driving a 60 Ω differential load. Estimate: at 3.3 V VCC with a fully loaded 32-node bus, total supply current peaks near 60 mA - budget your 3.3 V LDO for at least 100 mA per transceiver to avoid dropout during simultaneous driver switching events.
Thông tin tuân thủ
RoHS and REACH compliant per TI product page. IEC 61000-4-2 ESD protection rated to 12 kV contact discharge on bus pins. Not AEC-Q100 qualified - this is an industrial-grade part.
