Product details


Number of receivers 1 Number of transmitters 1 Duplex Half Supply voltage (Nom) (V) 3.3, 5 Signaling rate (Max) (Mbps) 12 IEC 61000-4-2 contact (+/- kV) 8 Fault protection (V) -16 to 16 Common mode range -7 to 12 Number of nodes 256 Features IEC ESD protection Isolated No ICC (Max) (mA) 3 Rating Catalog Operating temperature range (C) -40 to 125 open-in-new Find other RS-485 & RS-422 transceivers

Package | Pins | Size

SOIC (D) 8 19 mm² 4.9 x 3.9 open-in-new Find other RS-485 & RS-422 transceivers


  • Meets or exceeds the requirements of the TIA/EIA-485A standard
  • 3-V to 5.5-V Supply voltage
  • Half-duplex RS-422/RS-485
  • Data rates
    • THVD1400: 500 kbps
    • THVD1420: 12 Mbps
  • Bus I/O protection
    • ±16-kV HBM ESD
    • ±8-kV IEC 61000-4-2 Contact discharge
    • ±15-kV IEC 61000-4-2 Air gap discharge
    • ±4-kV IEC 61000-4-4 Fast transient burst
    • ±16-V bus fault protection (absolute max voltage on bus pins)
  • Small, space-saving 8-pin SOT package option (2.1 mm x 1.2 mm)
    • See the layout example for co-layout with standard SOIC-8 package
  • Extended industrial temperature range: -40°C to 125°C
  • Large receiver hysteresis for noise rejection
  • Low power consumption
    • Low standby supply current: < 1 µA
    • Quiescent current during operation: 1.5 mA (typ)
  • Glitch-free power-up/down for hot plug-in capability
  • Open, short, and idle bus failsafe
  • 1/8 Unit load (Up to 256 bus nodes)
open-in-new Find other RS-485 & RS-422 transceivers


THVD1400 and THVD1420 are robust half-duplex RS-485 transceivers for industrial applications. The bus pins are immune to high levels of IEC Contact Discharge ESD events, eliminating the need for additional system level protection components.

The devices operate from a single 3 to 5.5-V supply. The wide common-mode voltage range and low input leakage on bus pins make the devices suitable for multi-point applications over long cable runs.

THVD1400 and THVD1420 are available in industry standard, 8-pin SOIC package for drop-in compatibility as well as in the industry-leading, small SOT package. The devices are characterized for ambient temperatures from –40°C to 125°C.

open-in-new Find other RS-485 & RS-422 transceivers
Similar products you might be interested in
open-in-new Compare products
Pin-for-pin with same functionality to the compared device.
THVD1429 ACTIVE 3.3-V to 5-V RS-485 transceiver with surge protection Integrated 2.5-kV IEC 61000-4-5 surge protection and 20-Mbps maximum data rate
THVD1450 ACTIVE 3.3-V to 5-V RS-485 transceiver with ±18-kV IEC ESD protection 18-kV IEC 61000-4-2 ESD contact discharge protection and supports maximum 50-Mbps data rate
THVD2450 ACTIVE ±70-V fault-protected 3.3-V to 5-V RS-485 transceiver with IEC ESD +/-70-V bus fault protection and works with +/-25-V common mode voltage range, and supports maximum 50-Mbps data rate
Similar functionality to the compared device.
NEW THVD1426 PREVIEW 3.3-V to 5-V 12-Mbps half-duplex RS-485 transceiver auto-direction control ±8-kV IEC ESD protection Supports auto direction function

Technical documentation

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 1
Type Title Date
* Data sheet THVD1400, THVD1420 3.3-V to 5-V RS-485 Transceivers in Small Package with ±8-kV IEC ESD Protection datasheet (Rev. A) Apr. 08, 2021

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide
The RS-485 half-duplex evaluation module (EVM) helps designers evaluate device performance, supporting fast development and analysis of data-transmission systems using any of the SN65HVD1x, SN65HVD2x, SN65HVD7x, SN65HVD8x and SN65HVD96 half-duplex transceivers. The EVM board comes without the RS-485 (...)

The EVM lets you quickly, easily and accurately evaluate TI's family of RS-485 products.

  • RS-485 half-duplex EVM PWB
  • Screw-type SMA jacks and Bergstik headers serve as the I/O connections
  • Banana jacks serve as the DC power input terminals

Design tools & simulation

PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
document-generic User guide

CAD/CAE symbols

Package Pins Download
SOIC (D) 8 View options
SOT-5X3 (DRL) 8 View options

Ordering & quality

Information included:
  • RoHS
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​