ST485CDR from STMicroelectronics, in a SO-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. Drives high when A-B >= +0.2 V and low when A-B <= -0.2 V (with RE low); high-impedance 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. VIH >= 2.0 V, VIL <= 0.8 V.
3	DE	input	Driver output enable, active high. Drive high to enable the differential driver outputs A and B; drive low to place them in high-impedance state. VIH >= 2.0 V, VIL <= 0.8 V.
4	DI	input	Driver input. Logic level to be transmitted on the differential bus: DI high -> A high / B low; DI low -> A low / B high (when DE is high). VIH >= 2.0 V, VIL <= 0.8 V.
5	GND	power_in	Ground reference (0 V) for the device.
6	A	bidirectional	Non-inverting receiver input and non-inverting driver output (RS-485/RS-422 bus line A). Differential I/O rated +/-14 V absolute max, -7 V to 12 V common-mode range; receiver input resistance >= 24 kOhm.
7	B	bidirectional	Inverting receiver input and inverting driver output (RS-485/RS-422 bus line B). Differential I/O rated +/-14 V absolute max, -7 V to 12 V common-mode range; receiver input resistance >= 24 kOhm.
8	VCC	power_in	Supply voltage input. Operates from a single 5 V +/-5% supply; 7 V absolute maximum. Typical no-load supply current is 300 µA.

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	SO-8
Category	Logic
Pins	8

Ordering variants

Same part, different packaging or reel option.

ST485CDR
ST485CDRBDR
ST485CDRCN
ST485CDRBN

CAD (KiCad official)

Symbol: ST485CDR
Footprint: Package_SO:TI_SO-PowerPAD-8
3D model: SO-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`st485cdr.step`	123 KB	You want the bare part, or you mark your own boards.
`st485cdr-etched.step`	2.0 MB	You want the part with `ST485CDR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 478 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 6457a31fd5dacba4, 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