THVD1420DR 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	Receiver data output. Digital CMOS output that reflects the differential bus state on A/B when the receiver is enabled (RE low).
2	RE	input	Receiver enable, active low. Digital input with internal 2-MΩ pull-up; pulling low enables the receiver output (R), pulling high places R in high-impedance.
3	DE	input	Driver enable, active high. Digital input with internal 2-MΩ pull-down; pulling high enables the differential bus driver, pulling low places A/B in high-impedance.
4	D	input	Driver data input. Digital CMOS input; logic level determines the differential polarity driven onto A/B when the driver is enabled (DE high).
5	GND	power_in	Device ground reference for logic and bus circuitry.
6	A	bidirectional	Non-inverting RS-485 differential bus I/O (complementary to B). Absolute bus voltage rating −16 V to +16 V; ±12-kV IEC 61000-4-2 contact-discharge ESD protection.
7	B	bidirectional	Inverting RS-485 differential bus I/O (complementary to A). Absolute bus voltage rating −16 V to +16 V; ±12-kV IEC 61000-4-2 contact-discharge ESD protection.
8	VCC	power_in	Supply voltage input, 3.0 V to 5.5 V (nominal 3.3 V or 5 V). Bypass locally with a 100-nF ceramic capacitor to GND.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

THVD1420DR
THVD1420DRD
THVD1420DRL
THVD1420DRLR

CAD (KiCad official)

Symbol: THVD1420DR
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
`thvd1420dr.step`	122 KB	You want the bare part, or you mark your own boards.
`thvd1420dr-etched.step`	1.8 MB	You want the part with `THVD1420DR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 465 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 (33 pp, sha256 5ba9785d9fb8dc87, 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