SP485EIM from HGSEMI, 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. When RE is low: if (A - B) ≥ 200 mV, RO is high; if (A - B) ≤ -200 mV, RO is low. Drives typical UART RX input.
2	RE	input	Receiver output enable, active low. When RE is low, RO is active; when RE is high, RO is high-impedance. If RE is high and DE is low simultaneously, the device enters low-power shutdown mode. Hot-swap protected input.
3	DE	input	Driver output enable, active high. When DE is high, driver outputs A/B are active; when DE is low, A/B are high-impedance. If DE is low while RE is high, the device enters low-power shutdown mode. Hot-swap protected input.
4	DI	input	Driver input. When DE is high: DI low drives A low and B high; DI high drives A high and B low. Typical connection is the UART TX line.
5	GND	power_in	Ground reference (0 V).
6	A	bidirectional	Non-inverting receiver input and non-inverting driver output on the RS-485 differential bus. Absolute-max range -7 V to +12 V; ±16 kV ESD (IEC 61000-4-2 air) on the bus pins.
7	B	bidirectional	Inverting receiver input and inverting driver output on the RS-485 differential bus. Absolute-max range -7 V to +12 V; ±16 kV ESD (IEC 61000-4-2 air) on the bus pins.
8	VCC	power_in	Positive supply, 4.5 V ≤ VCC ≤ 5.5 V. Decouple to GND with a 0.1 µF ceramic capacitor placed close to the pin.

Key specifications

Parameter	Value
Manufacturer	HGSEMI
Package	SOP-8
Category	Interface
Pins	8

Ordering variants

Same part, different packaging or reel option.

SP485EIM/TR
SP485ECM/TR
SP485EIN
SP485ECN
SP485EIMM/TR
SP485ECMM/TR

CAD (KiCad official)

Symbol: SP485EIM
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: HGSEMI datasheet (17 pp, sha256 01ef68b4a0c8c0b3, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
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