SN65HVD37D - 3.3V Full-Duplex RS-485 Transceiver | TI (Tape & Reel)
MPN: SN65HVD37D ✓ Hoạt độngSN65HVD37D Tóm tắt
An RS-485 transceiver is a bus-interface IC that converts a single-ended UART/CMOS logic signal into a differential signal suitable for transmission over twisted-pair copper cabling, while rejecting common-mode noise picked up along the cable. The RS-485 standard (TIA/EIA-485) supports multi-drop buses, high noise immunity, and long cable runs, and is widely used as the physical layer for industrial protocols such as Modbus RTU, PROFIBUS DP, BACnet MS-TP, DMX512, and NMEA 0183. The HVD37 family belongs to the 3.3V-supply segment, allowing direct connection to low-voltage microcontrollers and FPGAs without level shifters.
Key specifications include a 3.3V nominal supply (3V to 3.6V operating range), 1/8 unit-load receiver input impedance that allows up to 256 nodes on a single bus, bus-pin ESD protection exceeding 15 kV HBM, data rates up to 25 Mbps, and a wide common-mode voltage range for harsh industrial environments. The driver and receiver can each be independently enabled, providing flexible half-/full-duplex and shutdown control; quiescent current is typically 1 mA in operation and the standby/shutdown mode draws under 1 uA typical. High receiver hysteresis (typ. 60 mV) delivers robust noise immunity on long cables.
Architecturally, the device uses TI's HVD series bipolar/diffusion process with integrated ESD cells on the bus pins and thermal-shutdown protection on the die. Fail-safe receiver design guarantees a known logic-high output when the bus is idle, open, or shorted, eliminating the need for external biasing resistors in many designs. The combination of 3.3V supply, 1/8 unit loading, and 25 Mbps speed positions this part between slow fault-tolerant transceivers and high-speed isolated RS-485 devices.
Typical applications include industrial fieldbus nodes (Modbus, PROFIBUS), motor-drive control boards, building-automation gateways (BACnet), solar inverter monitoring, smart-meter AMR modules, and any multi-drop RS-485 network requiring low standby power. Designers choose this part when both directions must be active simultaneously on separate pairs.
Designers should add 100 nF decoupling close to VCC and a small TVS/termination network at the bus pins, and remember that 1/8 unit-load transceivers permit large node counts but still require proper cable termination (typically 120 ohm at both ends) and stub-length discipline.
This page synthesizes distributor pricing, drop-in alternatives, and design notes not aggregated on any single distributor or manufacturer page.
Bộ thay thế dễ dàng lắp đặt cho SN65HVD37D — 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 SN65HVD37D (cùng hình factor và footprint) — khác nhau ở Package.
SN65HVD37DGSR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN65HVD35DR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN65HVD34DR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN65HVD31DR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX3483ESA+
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →SP3483EN-L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN65HVD37D Thông số kỹ thuật
| Device Type | Transceiver (1 driver / 1 receiver) |
| Protocol | RS-422, RS-485 |
| Number of Drivers/Receivers | 1 / 1 |
| Duplex | Full |
| Supply Voltage (VCC) | 3 V to 3.6 V (nominal 3.3 V) |
| Signaling Rate | Up to 25 Mbps |
| Receiver Unit Load | 1/8 unit load (up to 256 nodes) |
| Bus-Pin ESD Protection (HBM) | >15 kV HBM |
| Receiver Hysteresis | 60 mV (typical) |
| Quiescent Current (active) | 1 mA (typical) |
| Standby / Shutdown Current | <1 uA (typical) |
| Nhiệt độ hoạt động | -40 C to +85 C |
| Hộp | 14-SOIC (D), 0.154" / 3.90 mm width |
| Kiểu lắp đặt | Surface Mount |
| RoHS / Lead-Free | RoHS compliant, lead-free (per TI product page) |
| Fail-Safe Receiver | Yes (idle/open/short safe) |
| Driver / Receiver Enable | Independent DE and RE pins |
Cấu hình chân SN65HVD37D
| Chân 1 | VCC — 3.3V supply input |
| Chân 2 | R — Receiver output (RO), CMOS-level |
| Chân 3 | RE — Receiver enable, active-low |
| Chân 4 | DE — Driver enable, active-high |
| Chân 5 | D — Driver input (DI), CMOS-level |
| Chân 6 | GND — Ground reference |
| Chân 7 | Y — Driver non-inverting output (bus side) |
| Chân 8 | Z — Driver inverting output (bus side) |
| Chân 9 | B — Receiver inverting input (bus side) |
| Chân 10 | A — Receiver non-inverting input (bus side) |
| Chân 11 | NC — Not connected (per datasheet) |
| Chân 12 | NC — Not connected (per datasheet) |
| Chân 13 | NC — Not connected (per datasheet) |
| Chân 14 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
SN65HVD37D phù hợp cho 6 Áp dụngs: Modbus RTU Industrial Fieldbus, Building Automation / BACnet MS-TP, Solar Inverter Monitoring / Smart Energy, Motor Drive Control Board Communications, Smart Meter AMR / AMI Modules, DMX512 Stage Lighting Networks.
Modbus RTU Industrial Fieldbus
The SN65HVD37D is a strong fit for Modbus RTU nodes operating at 9600-115,200 bps over multi-drop twisted pair. Its 3.3V supply aligns with modern STM32/PIC32 MCU rails, removing level shifters, while 1/8 unit load supports dense sensor/actuator arrays (up to 256 nodes) on a single bus segment. Wide common-mode range rejects ground-potential differences across factory floors. Combined with >15 kV HBM ESD on the bus pins, the device tolerates installation transients typical of PLC cabinets. Place 120 ohm termination at both cable ends, keep stubs under one-twelfth of the driver rise time, and add a TVS such as SMAJ12CA at the bus entry for surge protection.
Được đề xuất
Building Automation / BACnet MS-TP
BACnet MS-TP controllers benefit from the SN65HVD37D's full-duplex capability and 1/8 unit load for high node counts on a single MSTP segment. Operating at 9.6-76.8 kbps, the device runs well below its 25 Mbps ceiling, leaving ample margin for cable-noise-induced jitter. The independent DE/RE pins simplify auto-direction control in BACnet router stacks. Bus-pin ESD >15 kV HBM protects controllers during HVAC field wiring. For panel-level designs, the part's thermal characteristics in 14-SOIC support fanless enclosures. Always add fail-safe biasing resistors (typically 680 ohm to VCC, 680 ohm to GND on A/B) when no other node is driving.
Được đề xuất
Solar Inverter Monitoring / Smart Energy
Inside solar inverters and DC combiners, the SN65HVD37D provides a robust 3.3V RS-485 link for module-level monitoring and string-current reporting. Its low standby current (<1 uA) extends battery life in nighttime telemetry modes, and the wide common-mode range tolerates ground loops across long DC-bus wiring. Up to 256 inverters can be daisy-chained for utility-scale arrays. With operating temperatures from -40 C to +85 C, the device survives outdoor inverter enclosures. Add a gas-discharge tube at the bus entry for lightning-induced surge protection, and use shielded twisted pair (Belden 3106A or equivalent) for EMI rejection.
Được đề xuất
Motor Drive Control Board Communications
Variable-frequency drives (VFDs) and servo amplifiers use the SN65HVD37D to expose a Modbus or CANopen-over-RS-485 service port for commissioning and SCADA integration. The device's 25 Mbps ceiling supports faster proprietary protocols, while 1/8 unit load allows daisy-chaining dozens of drives on a single service bus. Its high receiver hysteresis (60 mV typical) prevents false switching from the high dV/dt noise emitted by IGBT switching edges. Mount the transceiver at the panel-edge connector with isolated ground, and place a 100 nF decoupling cap adjacent to VCC. Common-mode chokes (e.g. TDK ACM2012) further harden the bus against motor-bearing capacitive coupling.
Được đề xuất
Smart Meter AMR / AMI Modules
Electricity, water, and gas smart meters use the SN65HVD37D to relay consumption data over a low-power RS-485 mesh to data concentrators. The part's <1 uA standby current is critical for battery-backed or energy-harvesting meters, allowing the radio/transceiver to sleep between polling cycles. The 1/8 unit load permits hundreds of meters per concentrator port. Robust bus-pin ESD protects against mis-wired installations during field deployment. Operating from -40 C to +85 C, the device is suitable for outdoor meter enclosures in cold-climate deployments. Always include reverse-polarity and over-voltage protection at the meter terminal block.
Được đề xuất
DMX512 Stage Lighting Networks
DMX512 lighting consoles and dimmer racks use the SN65HVD37D's 250 kbps-class full-duplex capability (well within the 25 Mbps ceiling) to drive long runs of XLR-connected fixtures. Full-duplex operation supports DMX-512-A RDM (Remote Device Management) bidirectional traffic on the same pair. Independent DE/RE enables hardware-direction control with no software latency. With 1/8 unit loading, multiple receivers can sit on a single daisy-chain. Use shielded cable (Belden 9841 or equivalent) and 120 ohm termination at both ends, plus XLR connector shields bonded to chassis ground. The device's robust ESD tolerates hot-plugging fixture swaps during live shows.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho SN65HVD37D — 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 | SN65HVD37D | SN65HVD35DR | SN65HVD34DR | MAX3483ESA |
|---|---|---|---|---|---|
| Package | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 4.5 V to 5.5 V | 3.0 V to 3.6 V |
| Signaling Rate | 25 Mbps | 25 Mbps | 1 Mbps | 5 Mbps | 250 kbps |
| Unit Load | 1/8 (256 nodes) | 1/8 (256 nodes) | 1/8 (256 nodes) | 1 (32 nodes) | 1 (32 nodes) |
| Duplex | Full | Full | Full | Full | Full |
| Approx. Unit Price (qty 1) | $3.10 | $3.00 (tube) | $2.95 | $3.20 | $2.40 |
Bảo phân biệt quan trọng
- 1/8 unit load supports 256 nodes vs 32 for standard RS-485 (vsSN65HVD34DR)
- Higher signaling rate (25 Mbps) vs 1 Mbps (vsSN65HVD35DR)
- True full-duplex operation with separate TX/RX pairs (vsMAX3485ESA)
- 3.3V native supply vs 5V required by competitors (vsSN65HVD34DR)
Ghi chú thiết kế
Decouple VCC with a 100 nF X7R ceramic capacitor placed within 2 mm of the VCC pin (pin 1), plus a bulk 10 uF tantalum or ceramic at the supply entry. Place bus pins Y/Z and A/B on the opposite package edge, route the differential pair with 100 ohm differential impedance, and keep length matching within 5 mm to avoid skew. Maintain a continuous ground plane under the SOIC footprint and stitch vias around the bus connector to chassis ground for ESD return.
Do not leave DE/RE floating - the SN65HVD37D has internal pull behavior, but external tie-offs (DE to VCC for always-driving, RE to GND for always-receiving) prevent spurious bus contention at power-up. Without proper biasing, idle-bus state may produce undefined receiver outputs; the fail-safe feature helps but is not a substitute for clean enable control. Also, never fail to add a 120 ohm termination resistor at each end of the bus - stubs longer than one-sixth of the driver rise time cause reflections and bit errors above 1 Mbps.
For CE/FCC compliance, add a common-mode choke (TDK ACM2012-201 or equivalent) in series with each bus line, plus a 10 nF Y-capacitor to chassis ground at the bus connector. This combination attenuates common-mode currents above 10 MHz while preserving the differential signal. For long outdoor cables, supplement with a bidirectional TVS (SMAJ12CA or P6KE12CA) clamped to ground to absorb transient over-voltage from lightning-induced coupling.
Estimated: cable propagation delay is ~5 ns/m for typical twisted pair. At 25 Mbps, a 100 m cable produces 500 ns of one-way delay - well within half a bit period (20 ns), but skew between Y/Z and A/B pairs of more than 5 ns can cause collisions in full-duplex mode. For full-duplex, use matched cable pairs (e.g. Belden 3106A) and limit cable length to 30 m at 25 Mbps to avoid echo-induced errors. Lower data rates (1 Mbps SN65HVD35DR) extend reach to 1200 m per RS-485 spec.
Thông tin tuân thủ
RoHS/REACH compliant per TI product page; lead-free matte-tin plating. Industrial-grade (-40 C to +85 C), not AEC-Q100 qualified - for automotive RS-485, see SN65HVD37-Q1 or ISO3086 isolated variants.
