SN65HVD3085EDR - 5V Half-Duplex RS-485 Transceiver | TI
MPN: SN65HVD3085EDR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.55 | $0.55 |
| 10 | $0.48 | $4.80 |
| 100 | $0.4 | $40.00 |
| 500 | $0.35 | $175.00 |
| 1,000 | $0.32 | $320.00 |
Drop-in alternatives for SN65HVD3085EDR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
SN65HVD3082EDR
β Drop-Inπ Reference alternative (not in catalog)
SN65HVD3088EDR
β Drop-Inπ Reference alternative (not in catalog)
SN65HVD3085ED
β Drop-Inπ Reference alternative (not in catalog)
SN65HVD255QDRQ1
β‘ Same Packageβ In Stock
$0.98 / Unit
View Datasheet βMAX485CSA
β‘ Same Packageπ Reference alternative (not in catalog)
ADM485ARNZ
β‘ Same Packageπ Reference alternative (not in catalog)
SN65HVD3085EDR Maximum Ratings & Electrical Characteristics
| Function | Half-duplex RS-485 transceiver (1 driver / 1 receiver) |
| Protocol | RS-485, RS-422 (TIA/EIA-485A compliant) |
| Supply Voltage | 4.5 V to 5.5 V (5 V nominal) |
| Signaling Rate | [DATA_NEEDED: exact Mbps rating from datasheet table] |
| Operating Temperature | -40C to +85C |
| Package | SOIC-8 (D) |
| Mounting Type | Surface Mount |
| Duplex | Half-duplex |
| Number of Drivers/Receivers | 1 / 1 |
| Standard Compliance | TIA/EIA-485A |
| Transition Times | Controlled (for long twisted-pair cables) |
| RoHS Status | Compliant |
| Units Per Reel | [DATA_NEEDED: tape and reel quantity] |
| MSL Level | [DATA_NEEDED: moisture sensitivity level] |
| Isolation | None (non-isolated) |
SN65HVD3085EDR Pin Configuration
| Pin 1 | R β Receiver output |
| Pin 2 | RE β Receiver enable (active low) |
| Pin 3 | DE β Driver enable (active high) |
| Pin 4 | D β Driver input |
| Pin 5 | GND β Ground |
| Pin 6 | A β Bus line A (non-inverting receiver input / driver output) |
| Pin 7 | B β Bus line B (inverting receiver input / driver output) |
| Pin 8 | VCC β 5V supply (4.5V to 5.5V) |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
SN65HVD3085EDR is suitable for 6 applications: Industrial Automation and Modbus Networks, Building Automation and HVAC Control, Battery Management System Communications, Motor Drives and Inverters, Security and Surveillance System Buses, Test and Measurement Instrumentation.
Industrial Automation and Modbus Networks
The SN65HVD3085EDR fits factory RS-485 multidrop networks because its differential driver/receiver pair meets TIA/EIA-485A and tolerates the ground-potential shifts typical on long factory floors. Its controlled transition times limit EMI and reflections on twisted pair, allowing reliable communication over hundreds of meters. Running from a standard 5V industrial rail (4.5V-5.5V), it connects directly to MCU UART pins via DE/RE direction control, with no external level shifting. With 120 ohm end-of-line termination and fail-safe biasing, idle-bus chatter is eliminated even at high node counts.
Recommended
Building Automation and HVAC Control
HVAC controllers, VFDs, and BMS gateways commonly communicate over RS-485 buses. The SN65HVD3085EDR's -40C to +85C operating range survives rooftop and mechanical-room temperature swings, while its low-power 5V operation suits retrofit control panels. Controlled slew rates on the A/B outputs reduce radiated emissions alongside motor-drive cabling. Because driver and receiver enables are separate pins (DE, RE), a single MCU GPIO can switch direction with minimal timing overhead, simplifying Modbus RTU master/slave firmware in thermostats and air-handling units.
Recommended
Battery Management System Communications
In BMS stacks, cell-management boards report voltage, current, and temperature over daisy-chained differential buses. The SN65HVD3085EDR provides the 5V physical-layer transceiver for such links; its bus fault tolerance protects against wiring faults during pack assembly or service. Controlled transition times keep signaling clean over the stacked twisted-pair harness despite switching noise from contactors and DC-DC converters. Pair it with an isolated supply or isolator for modules referenced to different stack potentials, and terminate the string ends at 120 ohm for signal integrity.
Recommended
Motor Drives and Inverters
Motor-drive control boards use RS-485 links between the host PLC and drive firmware. The SN65HVD3085EDR's differential signaling rejects the large common-mode noise generated by PWM switching, and its TIA/EIA-485A bus-fault tolerance adds robustness in high-voltage cabinets. The -40C to +85C range covers drive heatsink enclosures. Place the transceiver near the connector with a 120 ohm termination, and use an isolator (or isolated supply) between the transceiver and the control ground to block common-mode transients from long motor cables.
Recommended
Security and Surveillance System Buses
PTZ cameras, access panels, and DVR/NVR head-end units frequently use RS-485 for control telemetry. The SN65HVD3085EDR drives long twisted-pair runs from camera housings to controllers, with controlled slew rates limiting crosstalk in bundled cabling. Its 5V supply matches legacy camera power rails, and the SOIC-8 footprint fits compact camera PCBs. The separate DE/RE pins allow half-duplex direction switching in polling protocols, and the -40C to +85C range supports outdoor enclosures when paired with local thermal design.
Recommended
Test and Measurement Instrumentation
Bench instruments, data loggers, and DAQ systems expose RS-485 ports for interfacing with industrial sensors. The SN65HVD3085EDR provides a low-cost, standard-compliant physical layer with predictable timing across -40C to +85C, making it easy to certify instrument interfaces. Its SOIC-8 package occupies minimal board area on crowded mainboards, and the 5V operation interfaces with legacy logic through simple series resistors. Controlled transitions reduce radiated emissions, helping instruments meet EMC limits without additional filtering stages on the bus lines.
Recommended
Recommended Products Summary
Engineering reference data for SN65HVD3085EDR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN65HVD3082EDR | SN65HVD3088EDR | SN65HVD255QDRQ1 | MAX485CSA | ADM485ARNZ |
|---|---|---|---|---|---|---|
| Package | SOIC-8 (D) | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 - similar footprint | SOIC-8 - similar footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Analog Devices |
| Supply Voltage | 5 V (4.5V-5.5V) | 5 V (4.5V-5.5V) | 5 V (4.5V-5.5V) | 3.3 V | 5 V | 5 V |
| Signaling Rate Class | 20 Mbps class (family speed grade) | 200 kbps | 250 kbps class | High-speed (3.3V automotive) | 250 kbps | 250 kbps |
| Duplex | Half | Half | Half | Half | Half | Half |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +125C (AEC-Q1) | 0C to +70C (CSA grade) | -40C to +85C |
| Standard Compliance | TIA/EIA-485A | TIA/EIA-485A | TIA/EIA-485A | TIA/EIA-485A | RS-485/RS-422 | RS-485/RS-422 |
| Grade / Qualification | Standard (industrial) | Standard (industrial) | Standard (industrial) | AEC-Q100 automotive | Standard (commercial) | Standard (industrial) |
Key Differentiators
- High speed grade in the SNx5HVD308xE family (vs SN65HVD3082EDR)
- Controlled driver transition times (vs MAX485CSA)
- Active, widely stocked TI portfolio part (vs ADM485ARNZ)
Design Notes
Place a 100 nF ceramic decoupling capacitor within 2 mm of the VCC pin (pin 8) to ground, plus a 1-10 uF bulk capacitor per transceiver node. Route the A/B bus traces as a tightly coupled differential pair (100-120 ohm differential impedance) directly from pins 6 and 7 to the connector, avoiding stubs and crossing planes.
Terminate both physical ends of the bus with 120 ohm resistors matching the twisted-pair characteristic impedance. Add fail-safe biasing (typically 560 ohm to VCC on A and 560 ohm to GND on B at the master node) so the receiver output stays defined when no driver is enabled. The controlled transition times of the SN65HVD3085E reduce reflections but do not remove the need for termination at 20 Mbps class speeds.
Do not exceed the 5.5V maximum supply. Tie RE low and drive DE from one GPIO for simple half-duplex direction control; leaving DE floating can enable the driver unpredictably. On 3.3V MCUs, verify VIH compliance on D and DE pins. For nodes on different ground domains, add an isolator (e.g., ISO1050) rather than relying on bus common-mode tolerance alone.
Compliance Information
RoHS compliant per TI product listing; current TI production parts are lead-free. REACH/halogen status not stated in retrieved data.
