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SN65HVD75DR

3.3V RS-485/422 transceiver, 50Mbps, 1/8 unit load (256 nodes), SOIC-8

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Manufacturer Part：

SN65HVD75DR

Package：

SOIC-8 (4.9 x 3.9 x 1.5mm)

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Description

Product Overview

The SN65HVD75DR from Texas Instruments is an RS-485/RS-422 transceiver with 1/8 unit load, supporting up to 256 nodes on the bus. It operates from 3.3V supply with data rates up to 50 Mbps and features half-duplex communication in an SOIC-8 package.

Key Specifications

Protocol RS-485 / RS-422
Data Rate Up to 50 Mbps
Supply Voltage 3.3V
Unit Load 1/8 (256 nodes per bus)
Bus Pin ESD Protection +/-16 kV HBM
Common Mode Range -7V to +12V
Receiver Sensitivity +/-200 mV
Operating Temperature -40 to 85 C
Package SOIC-8

Features

  • 1/8 unit load allows 256 nodes on a single bus
  • Up to 50 Mbps data rate for high-speed communication
  • +/-16kV ESD protection on bus pins
  • Hot-plug capable with glitch-free power-up/down
  • Fail-safe receiver (output high when bus open)

Applications

  • Industrial automation (Modbus, Profibus)
  • Building automation HVAC networks
  • Motion control and motor drives
  • Power grid monitoring and SCADA
  • Security and access control systems

The SN65HVD75DR from Texas Instruments is a 3.3V powered RS-485/RS-422 transceiver designed for half-duplex communication on multipoint buses. With a 1/8 unit load input impedance, it allows up to 256 nodes on a single bus, four times more than standard 1/4 unit load transceivers. The device supports data rates up to 50 Mbps, making it suitable for both legacy 9600-baud Modbus networks and high-speed industrial protocols. Bus pins feature +/-16kV ESD protection, and the fail-safe receiver ensures logic-high output when the bus is open or shorted.

The SN65HVD75DR operates as a half-duplex RS-485 transceiver with separate driver and receiver sections. **Driver Section**: When the DE (Driver Enable) pin is high, the differential driver amplifies the TTL-level TXD input into a differential signal on the A and B bus lines. The driver output swing is typically 2.4V differential. When DE is low, the driver outputs are high-impedance, releasing the bus for other nodes. **Receiver Section**: The differential receiver continuously monitors the A-B voltage. When the differential exceeds +200mV, the RXD output is high; when below -200mV, RXD is low. The /RE (Receiver Enable) pin controls whether the receiver output is active or high-impedance. **Fail-Safe**: When the bus is idle (open, shorted, or terminated but not driven), the receiver output defaults to a logic high. This is achieved by an internal bias that ensures the A-B differential exceeds +200mV when the bus is undriven, preventing false start bits. **1/8 Unit Load**: The high input impedance of the receiver (96kOhm typical vs 12kOhm for 1 unit load) reduces bus loading, allowing 256 transceivers on a single bus without exceeding the 32 unit load standard limit. **Hot-Plug**: Internal circuitry ensures that during power-up and power-down transients, the driver and receiver outputs remain in a known high-impedance state, preventing bus disruption when a node is inserted or removed.

Pin Name Description
1 R Receiver output (RXD)
2 /RE Receiver enable (active low)
3 DE Driver enable (active high)
4 D Driver input (TXD)
5 GND Ground
6 A Bus non-inverting I/O
7 B Bus inverting I/O
8 VCC 3.3V power supply
  • Modbus RTU: Industrial PLC communication networks with up to 256 slave nodes on a single bus
  • Motor Control: Multi-axis servo drive communication over RS-485 daisy chain
  • Building Automation: BACnet MS/TP and HVAC sensor networks
  • Power Grid: SCADA communication links for substation monitoring and control
  • Security Systems: Access control network wiring with multi-drop RS-485 topology
Model Manufacturer Key Difference
SN65HVD72DR TI Same family, 1 Mbps, lower cost
SP3485EN-L Sipex/MaxLinear 3.3V, 10Mbps, SOIC-8
MAX3485EESA+T Maxim 3.3V, 10Mbps, ESD, SOIC-8
THVD1500DR TI 5V, 50Mbps, 1/8 unit load, SOIC-8
ISL3152EIBZ Renesas 3.3V, 256 nodes, SOIC-8
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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