THVD1520DR 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 (digital output). Presents the recovered logic-level data from the differential bus (A-B).
2	RE	input	Receiver enable, active low (digital input). Internal ~5 MΩ pull-up; drive low to enable the receiver output R.
3	DE	input	Driver enable, active high (digital input). Internal ~5 MΩ pull-down; drive high to enable the differential driver onto the A/B bus.
4	D	input	Driver data input (digital input). Internal ~5 MΩ pull-up; TTL/CMOS logic level transmitted to the RS-485 bus when DE is asserted.
5	GND	power_in	Device ground reference (0 V).
6	A	bidirectional	RS-485 differential bus I/O port A (non-inverting, complementary to B). Rated bus common-mode range -7 V to +12 V.
7	B	bidirectional	RS-485 differential bus I/O port B (inverting, complementary to A). Rated bus common-mode range -7 V to +12 V.
8	VCC	power_in	5-V supply. Recommended operating range 4.5 V to 5.5 V; typical quiescent current 600 µA with driver and receiver enabled.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOIC-8
Category	Comm/UART
Pins	8

Ordering variants

Same part, different packaging or reel option.

THVD1520DR
THVD1520DRD

CAD (KiCad official)

Symbol: THVD1520DR
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
`thvd1520dr.step`	122 KB	You want the bare part, or you mark your own boards.
`thvd1520dr-etched.step`	1.9 MB	You want the part with `THVD1520DR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 480 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 (27 pp, sha256 d500e0bf686eaf7b, 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