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Texas Instruments THVD9491-SEP ±40V RS-422/RS-485 Transceiver

Texas Instruments THVD9491-SEP Space Enhanced ±40V RS-422/RS-485 Transceiver is a ±40V fault-protected full-duplex RS-422/RS-485 transceiver using a 1.65V to 5.5V logic supply for data and enable logic signals, and a 3V to 5.5V bus side supply. The device has a slew rate select feature that enables the use at two maximum speeds based on the SLR pin setting.

The device features integrated IEC ESD protection, eliminating the need for external system-level protection components. The ±12V input common-mode range makes reliable data communication over longer cable run lengths and/or in the presence of large ground loop voltages. Enhanced 250mV receiver hysteresis provides high noise rejection. In addition, the receiver fail-safe feature ensures a logic high when the inputs are open or shorted together.

Texas Instruments THVD9491-SEP device is available in a standard 14-pin SOIC package.

Features

  • VID V62/24626
  • Meets or exceeds the requirements of the TIA/EIA-485A and TIA/EIA-422B standards
  • Total ionizing dose (TID) characterized up to 30krad (Si) with a total ionizing dose of radiation lot acceptance testing (TID RLAT) for every wafer lot to 30krad (Si)
  • Single-event effects (SEE) characterized with single event latch-up (SEL) immune to linear energy transfer (LET) = 43MeV⋅cm2/mg at 125°C
  • Space-enhanced plastic (Space EP)
    • Controlled baseline
    • One assembly and test site
    • One fabrication site
    • Gold bond wire
    • NiPdAu lead finish
    • Military temp range (-55°C to 125°C)
    • Extended product life cycle
    • Product traceability
    • Meets the NASA ASTM E595 outgassing specification
  • 3V to 5.5V supply voltage
  • 1.65V to 5.5V supply for data and enable signals
  • SLR pin selectable data rates of 20Mbps and 50Mbps
  • Bus I/O protection
    • ±40V DC bus fault
    • ±16kV HBM ESD
    • ±8kV IEC 61000-4-2 contact discharge
    • ±4kV IEC 61000-4-4 fast transient burst
  • Symmetric common mode range of ±12V
  • Enhanced receiver hysteresis for noise immunity
  • Glitch-free power-up or down for hot plug-in capability
  • Open, short, and idle bus failsafe
  • 1/8 unit load (up to 256 bus nodes)
  • Leaded 14-pin SOIC package

Applications

  • Low Earth Orbit (LEO) space applications
  • Command and data handling
  • Communications payload systems
  • Optical imaging
  • Radar imaging payload

Additional Resources

Simplified Schematic

Schematic - Texas Instruments THVD9491-SEP ±40V RS-422/RS-485 Transceiver

Development Tool

Texas Instruments THVD24X2VEVM Transceiver Evaluation Module (EVM)

This module provides a quick way to evaluate TI’s THVD24X2V, a full duplex RS-485 transceiver.

Learn Moreabout Texas Instruments THVD24X2VEVM Transceiver Evaluation Module (EVM) View Productsrelated to Texas Instruments THVD24X2VEVM Transceiver Evaluation Module (EVM)
Published: 2025-03-07 | Updated: 2025-03-11