THVD1450DR from Texas Instruments, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	R	output	Receive data output. CMOS logic-level output driven from the RS-485 bus differential receiver (A-B). High-impedance when RE is deasserted (high).
2	RE	input	Receiver enable, active low. Drive low to enable the receiver output R; drive high to place R in Hi-Z. 2-MΩ internal pull-up so the pin defaults to disabled if left floating.
3	DE	input	Driver enable, active high. Drive high to enable the differential driver onto the A/B bus; drive low to place the driver in Hi-Z. 2-MΩ internal pull-down so the driver defaults to disabled if left floating.
4	D	input	Driver data input. CMOS logic-level input; drives the differential A/B outputs when DE is high.
5	GND	power_in	Device ground reference (0 V).
6	A	bidirectional	RS-485 differential bus I/O, non-inverting (A). Complementary to B. Withstands ±18 V bus fault and ±18 kV IEC 61000-4-2 contact ESD to GND.
7	B	bidirectional	RS-485 differential bus I/O, inverting (B). Complementary to A. Withstands ±18 V bus fault and ±18 kV IEC 61000-4-2 contact ESD to GND.
8	VCC	power_in	Supply voltage input, 3.3 V to 5 V nominal (3.0-5.5 V operating). Decouple to GND with a 100-nF ceramic capacitor placed close to the pin.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOIC-8
Category	Interface
Pins	8

Ordering variants

Same part, different packaging or reel option.

THVD1450DR
THVD1450DRD
THVD1450DRDGKR
THVD1450DRDGK
THVD1450DRBR
THVD1450DRBT

CAD (KiCad official)

Symbol: THVD1450DR
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`thvd1450dr.step`	122 KB	You want the bare part, or you mark your own boards.
`thvd1450dr-etched.step`	1.8 MB	You want the part with `THVD1450DR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 467 faces against 147 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

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