ST485EBDR from UMW, in a SOP-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 >= +0.2V, low when A-B <= -0.2V, and high (fail-safe) if inputs are open. High-impedance when RE is high.
2	RE	input	Receiver output enable, active-low. RE = 0 enables RO; RE = 1 places RO in a high-impedance state. TTL/CMOS input (VIH >= 2V, VIL <= 0.8V).
3	DE	input	Driver output enable, active-high. DE = 1 enables the differential A/B driver outputs; DE = 0 places A and B in a high-impedance state. TTL/CMOS input (VIH >= 2V, VIL <= 0.8V).
4	DI	input	Driver input. When DE is high, DI = 1 drives A high / B low; DI = 0 drives A low / B high. TTL/CMOS input (VIH >= 2V, VIL <= 0.8V).
5	GND	power_in	Ground return for the device.
6	A	bidirectional	Non-inverting differential bus I/O. Driver non-inverting output when DE=1, and receiver non-inverting input. Withstands -7V to +14V common-mode; short-circuit protected (35 mA min, 250 mA max).
7	B	bidirectional	Inverting differential bus I/O. Driver inverting output when DE=1, and receiver inverting input. Withstands -7V to +14V common-mode; short-circuit protected (35 mA min, 250 mA max).
8	VCC	power_in	Positive supply, +5V (4.75V to 5.25V). Absolute maximum 7V. Typical no-load supply current 300-400 µA.

Key specifications

Parameter	Value
Manufacturer	UMW
Package	SOP-8
Category	Comm/UART
Pins	8

Ordering variants

Same part, different packaging or reel option.

ST485EBDR

CAD (KiCad official)

Symbol: ST485EBDR
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

Provenance

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

Datasheet: UMW datasheet (8 pp, sha256 3c644adb7eb56559, 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