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SN65HVD74DR

3.3V full-duplex RS-485 transceiver, 20Mbps, ±12kV IEC ESD, no enable pins, 8-SOIC

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Manufacturer Part：

SN65HVD74DR

Package：

8-Pin SOIC (4.9 x 3.9 x 1.27 mm)

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Description

Product Overview

The SN65HVD74DR is a Texas Instruments 3.3 V full-duplex RS-485 transceiver with ±12 kV IEC ESD protection and 20 Mbps data rate. The device is fully enabled with no external enable pins, features 70 mV receiver hysteresis for noise immunity, and supports up to 256 nodes on the bus. It is packaged in an 8-pin SOIC and operates from -40°C to +125°C.

Key Specifications

Data Rate 20 Mbps
Duplex Full-Duplex
Supply Voltage 3.3 V
ESD (IEC) ±12 kV contact
ESD (HBM) >±30 kV
Common-Mode Range -7 V to +12 V

Features

  • 20 Mbps full-duplex operation
  • ±12 kV IEC 61000-4-2 ESD
  • >±30 kV HBM ESD protection
  • No external enable pins required
  • 70 mV receiver hysteresis
  • 256 nodes on bus (1/8 unit load)
  • 5 V tolerant logic inputs

Applications

  • Industrial automation networks
  • Building automation and HVAC
  • Security and surveillance systems
  • Encoder and decoder interfaces

The SN65HVD74DR is a Texas Instruments 3.3 V full-duplex RS-485 transceiver optimized for 20 Mbps data rate with robust ESD protection. The ±12 kV IEC 61000-4-2 and >±30 kV HBM ESD ratings protect against electrostatic discharge in harsh industrial environments. The device is fully enabled without external enable pins, simplifying design. A 70 mV receiver hysteresis provides excellent noise rejection on long bus cables. The 1/8 unit load allows up to 256 nodes on a single bus. 5 V tolerant logic inputs are compatible with both 3.3 V and 5 V controllers. Packaged in an 8-pin SOIC rated for -40°C to +125°C.

The SN65HVD74 operates as a full-duplex RS-485 transceiver with independent driver and receiver paths. The driver converts single-ended TTL/CMOS logic (DI input) into differential signals on the Y and Z bus outputs, while the receiver converts differential bus signals (A and B inputs) into single-ended logic (RO output). The driver and receiver are always enabled (no DE/RE control pins), simplifying the design for full-duplex point-to-point applications. The 70 mV receiver hysteresis ensures reliable data reception in the presence of common-mode noise, while the wide common-mode range (-7 V to +12 V) supports long cable runs with ground potential differences.

Pin Mnemonic Description
1 RO Receiver output
2 DI Driver data input
3 GND Ground
4 Y Driver non-inverting output
5 Z Driver inverting output
6 B Receiver inverting input
7 A Receiver non-inverting input
8 VCC 3.3V supply
  • Industrial fieldbus communication with ±12kV IEC ESD and 256-node support
  • Building automation HVAC controllers with 70mV noise hysteresis
  • Security and surveillance system multi-drop RS-485 networks
  • Encoder/decoder interfaces requiring full-duplex 20Mbps operation
Model Manufacturer Key Difference
SN65HVD73DR TI With enable pins, 20 Mbps
SN65HVD77DR TI 50 Mbps, no enable pins
THVD1550DR TI 50 Mbps, with enables
ADM3077E ADI Similar 3.3V full-duplex
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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