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THVD1450 RS-485 Transceiver

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by Ray

5 V half-duplex RS-485 transceiver with wide common-mode range and bus protection.

rs-485transceiverinterface5vrobusttisoic-8
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THVD1450

Texas Instruments · RS-485 Transceiver · SOIC-8

The THVD1450 is a 5 V half-duplex RS-485 transceiver built for reliable industrial communication. It offers a wide -20 V to 25 V common-mode range, IEC ESD protection on the bus pins, and supports up to 256 nodes, making it a durable physical layer for Modbus and other multidrop networks over long cables.

Pinout

Pin Name Type Function
1 R output Receive data output. CMOS-level digital output representing the demodulated differential state of the A/B bus lines.
2 RE input Receiver enable, active low. Internal 2-MΩ pull-up to VCC keeps the receiver disabled if left floating.
3 DE input Driver enable, active high. Internal 2-MΩ pull-down to GND keeps the driver disabled (bus high-Z) if left floating.
4 D input Driver data input. CMOS-level digital input; when the driver is enabled, D=high forces A>B and D=low forces B>A.
5 GND power_in Device ground reference for logic supply and bus common-mode.
6 A bidirectional RS-485/RS-422 differential bus I/O port A (non-inverting), complementary to B. Withstands ±18-kV IEC 61000-4-2 contact discharge and ±15-V common-mode.
7 B bidirectional RS-485/RS-422 differential bus I/O port B (inverting), complementary to A. Withstands ±18-kV IEC 61000-4-2 contact discharge and ±15-V common-mode.
8 VCC power_in 3.3-V to 5-V single supply (operating range 3 V to 5.5 V). Bypass locally with 100-nF ceramic to GND.

Key specifications

Parameter Value
Type Half-duplex RS-485 transceiver
Supply voltage 4.5 V to 5.5 V
Data rate Up to 500 kbps
Common-mode range -20 V to 25 V
Bus protection IEC 61000-4-2 ESD
Bus loading Up to 256 nodes
Operating temperature -40 C to 125 C

Ordering variants

Same part, different packaging or reel option.

  • THVD1450D
  • THVD1450DGK
  • THVD1450DRB

CAD (KiCad official)

  • Symbol: thvd1450.kicad_sym
  • Footprint: thvd1450.kicad_mod
  • 3D model: SOIC-8 body from KiCad Package_SO/SOIC-8_3.9x4.9mm_P1.27mm.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (54 pp, sha256 58ecc4cc07dd1d32, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF