SN65HVD37DR - 3.3V Full-Duplex RS-485 Transceiver | TI
Référence : SN65HVD37DR ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $3.1 | $3,10 |
| 10 | $2.75 | $27,50 |
| 100 | $2.1 | $210,00 |
| 500 | $1.78 | $890,00 |
| 1 000 | $1.52 | $1 520,00 |
| 2 500 | $1.35 | $3 375,00 |
SN65HVD37DR Présentation
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.
Alternatives de remplacement direct pour SN65HVD37DR — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
SN65HVD37D
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SN65HVD37DGSR
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SN65HVD35DR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SN65HVD34DR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SN65HVD31DR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX3483ESA
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SP3483EN-L
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SN65HVD37DR Spécifications
| 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) |
| Température de fonctionnement | -40 C to +85 C |
| Boîtier | 14-SOIC (D), 0.154" / 3.90 mm width |
| Type de montage | 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 |
Configuration des broches de SN65HVD37DR
| Broche 1 | VCC — 3.3V supply input |
| Broche 2 | R — Receiver output (RO), CMOS-level |
| Broche 3 | RE — Receiver enable, active-low |
| Broche 4 | DE — Driver enable, active-high |
| Broche 5 | D — Driver input (DI), CMOS-level |
| Broche 6 | GND — Ground reference |
| Broche 7 | Y — Driver non-inverting output (bus side) |
| Broche 8 | Z — Driver inverting output (bus side) |
| Broche 9 | B — Receiver inverting input (bus side) |
| Broche 10 | A — Receiver non-inverting input (bus side) |
| Broche 11 | NC — Not connected (per datasheet) |
| Broche 12 | NC — Not connected (per datasheet) |
| Broche 13 | NC — Not connected (per datasheet) |
| Broche 14 | NC — Not connected (per datasheet) |
Applications typiques
SN65HVD37DR convient pour 6 applications: 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 SN65HVD37DR 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.
Recommandé
Building Automation / BACnet MS-TP
BACnet MS-TP controllers benefit from the SN65HVD37DR'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.
Recommandé
Solar Inverter Monitoring / Smart Energy
Inside solar inverters and DC combiners, the SN65HVD37DR 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.
Recommandé
Motor Drive Control Board Communications
Variable-frequency drives (VFDs) and servo amplifiers use the SN65HVD37DR 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.
Recommandé
Smart Meter AMR / AMI Modules
Electricity, water, and gas smart meters use the SN65HVD37DR 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.
Recommandé
DMX512 Stage Lighting Networks
DMX512 lighting consoles and dimmer racks use the SN65HVD37DR'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.
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Récapitulatif des produits recommandés
Données de référence d'ingénierie pour SN65HVD37DR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 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 |
Principaux différenciateurs
- 1/8 unit load supports 256 nodes vs 32 for standard RS-485 (vs SN65HVD34DR)
- Higher signaling rate (25 Mbps) vs 1 Mbps (vs SN65HVD35DR)
- True full-duplex operation with separate TX/RX pairs (vs MAX3485ESA)
- 3.3V native supply vs 5V required by competitors (vs SN65HVD34DR)
Notes de conception
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 SN65HVD37DR 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.
Informations de conformité
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.
