ST485BDR from STMicroelectronics, 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	RO	output	Receiver output. CMOS-level logic output that reflects the differential polarity of A vs B; high when (A-B) >= +0.2 V, low when (A-B) <= -0.2 V. High-impedance (tri-state) when RE is high. VOH >= 3.5 V at IO = -4 mA; VOL <= 0.4 V at IO = 4 mA.
2	RE	input	Receiver output enable (active-low). Drive low to enable the receiver output RO; drive high to place RO in high-impedance state. Input high >= 2.0 V, input low <= 0.8 V; input leakage ±2 µA.
3	DE	input	Driver output enable (active-high). Drive high to enable the differential driver outputs A/B; drive low to place A and B in high-impedance state (disables driver, allowing bus sharing). Input high >= 2.0 V, input low <= 0.8 V.
4	DI	input	Driver input. CMOS-level TTL-compatible logic input; when DE is high, DI high forces A high and B low, DI low forces A low and B high. Input high >= 2.0 V, input low <= 0.8 V; leakage ±2 µA.
5	GND	power_in	Ground / 0 V reference for the device.
6	A	bidirectional	Non-inverting differential bus pin: non-inverting receiver input and non-inverting driver output. Tolerates -7 V to +12 V common-mode; ±14 V absolute maximum. Receiver input impedance >= 24 kΩ.
7	B	bidirectional	Inverting differential bus pin: inverting receiver input and inverting driver output. Tolerates -7 V to +12 V common-mode; ±14 V absolute maximum. Receiver input impedance >= 24 kΩ.
8	VCC	power_in	Positive supply. Nominal 5 V ± 5 % (single supply). Absolute maximum 7 V. Quiescent supply current 300 µA typ. (unloaded, driver disabled).

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	SOIC-8
Category	Interface
Pins	8

Ordering variants

Same part, different packaging or reel option.

ST485BDR
ST485BDRCDR
ST485BDRBN
ST485BDRCN

CAD (KiCad official)

Symbol: ST485BDR
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
`st485bdr.step`	122 KB	You want the bare part, or you mark your own boards.
`st485bdr-etched.step`	2.0 MB	You want the part with `ST485BDR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 494 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: STMicroelectronics datasheet (19 pp, sha256 16bf6365fefdf622, 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