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SN65HVD74DGKR

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

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Manufacturer Part：

SN65HVD74DGKR

Package：

VSSOP-8 (3.0 x 4.9 x 1.45mm, 0.65mm pitch)

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Description

Product Overview

The SN65HVD74DGKR is a 3.3V full-duplex RS-485 transceiver from Texas Instruments with 20Mbps data rate, ±12kV IEC ESD, no enable pins, and 70mV receiver hysteresis in a VSSOP-8 package.

Key Specifications

Supply Voltage 3.3V (3.0V to 3.6V)
Signaling Rate 20 Mbps max
Duplex Full (separate TX and RX)
ESD Protection (IEC 61000-4-2) ±12kV contact discharge
Common-Mode Range -7V to +12V
Fault Protection -13V to +16.5V
Receiver Hysteresis 70mV typical
Nodes per Bus 256 (1/8 unit load)
Quiescent Current 1.1mA max (both enabled)
Standby Current 10nA typical (no enable, always active)
Operating Temperature -40°C to +125°C
Package VSSOP-8 (3 x 4.9mm)

Features

  • Always-enabled full-duplex operation (no enable pins needed)
  • 20Mbps data rate for high-speed RS-485 communication
  • ±12kV IEC ESD and ±30kV HBM protection on bus pins
  • 70mV receiver hysteresis for noise rejection
  • 1/8 unit load: up to 256 nodes on one bus
  • 5V tolerant logic inputs for mixed-voltage systems
  • Internal fail-safe biasing: receiver output high on bus idle
  • Glitch-free power-up and power-down for hot-plug

Applications

  • High-speed RS-485 communication links
  • Industrial automation networks
  • Building automation and HVAC
  • Security and access control systems
  • Automotive and transportation networks

The SN65HVD74DGKR is a 3.3V full-duplex RS-485 transceiver from Texas Instruments that is always enabled without external enable pins, simplifying system design. It supports data rates up to 20Mbps with robust ±12kV IEC 61000-4-2 ESD protection and ±30kV HBM on bus pins. The 70mV receiver hysteresis provides excellent noise rejection in electrically harsh industrial environments. Internal fail-safe biasing ensures the receiver output is high during bus idle or short-circuit conditions. The 1/8 unit load allows up to 256 nodes on a single bus. The device operates from -40°C to +125°C and features glitch-free power transitions for hot-plug applications.

The SN65HVD74DGKR translates between TTL logic levels and RS-485 differential bus signals. The driver converts the single-ended D input to a differential output on Y and Z: when D is high, Y goes high (≈3.5V) and Z goes low (≈1.5V), creating a positive differential voltage; when D is low, the polarity reverses. The receiver continuously monitors the differential voltage between A and B. When |VA – VB| > 200mV, the receiver determines the logic state; the 70mV hysteresis prevents output oscillation near the threshold. Internal fail-safe biasing pulls the receiver inputs to ensure the output defaults high when the bus is idle (all drivers off) or shorted. The device is always enabled (no DE or RE pins), meaning the driver always reflects the D input and the receiver always drives the R output. This simplifies designs where the transceiver is always active. The 5V tolerant logic inputs allow direct connection to 5V MCU GPIOs despite the 3.3V supply.

Pin Name Type Description
1 D Input Driver data input (TTL/CMOS)
2 GND Power Ground
3 VCC Power Supply (3.0V-3.6V)
4 R Output Receiver data output (TTL/CMOS)
5 B I/O RS-485 bus (inverting)
6 A I/O RS-485 bus (non-inverting)
7 Z Output Driver output (inverting)
8 Y Output Driver output (non-inverting)
  • High-Speed RS-485: 20Mbps supports high-throughput data links in motion control and vision systems
  • Simplified Design: Always-enabled operation eliminates enable pin routing; fewer GPIO pins needed from MCU
  • Industrial Networks: 70mV hysteresis rejects noise on long cable runs; ±12kV ESD protects connectors
  • Hot-Plug Systems: Glitch-free power-up prevents data corruption when cards are inserted into live backplanes
  • Multi-Drop: 1/8 unit load and 256-node capability suit large sensor networks in building automation
Model Manufacturer Key Difference Package Specs
SN65HVD74DR TI Same in SOIC-8 package – –
SN65HVD73DGKR TI 20Mbps with enable pins – –
SN65HVD77DGKR TI 50Mbps version, no enable – –
THVD1550DR TI 3.3-5V, 50Mbps, half-duplex, SOIC-8 – –
ISL3179EIBZ Renesas 3.3V, full-duplex, 20Mbps, SOIC-8 – –
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