ST485ERBDR 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. CMOS logic-level output representing the received differential state on A/B. High-impedance when RE is high (receiver disabled). VOH ≥ 3.5 V @ IO = -4 mA; VOL ≤ 0.4 V @ IO = 4 mA.
2	~RE	input	Receiver output enable (active-low). Drive low to enable RO; drive high to place RO in high-impedance. Logic input: VIH ≥ 2.0 V, VIL ≤ 0.8 V, IIN ≈ ±2 µA.
3	DE	input	Driver output enable (active-high). Drive high to enable the A/B differential driver outputs; drive low to place the driver outputs in high-impedance (3-state). Logic input: VIH ≥ 2.0 V, VIL ≤ 0.8 V.
4	DI	input	Driver input. CMOS logic-level input; when DE is high, DI = H drives B low and A high, DI = L drives B high and A low. VIH ≥ 2.0 V, VIL ≤ 0.8 V.
5	GND	power_in	Ground reference (0 V) for supply and all signal levels.
6	A	bidirectional	Non-inverting receiver input and non-inverting driver output of the RS-485/RS-422 differential bus. Withstands ±15 kV HBM / ±8 kV IEC-1000-4-2 ESD and -7 V to +12 V common-mode bus voltage. Receiver threshold VTH ±0.2 V referenced to B; input resistance ≥ 24 kΩ.
7	B	bidirectional	Inverting receiver input and inverting driver output of the RS-485/RS-422 differential bus. Withstands ±15 kV HBM / ±8 kV IEC-1000-4-2 ESD and -7 V to +12 V common-mode bus voltage. Complementary to A.
8	VCC	power_in	Supply voltage input, nominal 5 V (absolute maximum 7 V). Decouple locally to GND. Typical no-load supply current 300 µA (VDE = 0 V).

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

ST485ERBDR

CAD (KiCad official)

Symbol: ST485ERBDR
Footprint: Package_SO:TI_SO-PowerPAD-8
3D model: SO-8 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: STMicroelectronics datasheet (19 pp, sha256 6a5826d2bdc7896c, retrieved 2026-08-17, tier: lcsc)
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