JSM485ESA from JSMSEMI, 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	tri_state	Receiver output. When /RE is low, RO drives high if (A-B) ≥ 200 mV and low if (A-B) ≤ -200 mV. High-impedance when /RE is high.
2	/RE	input	Receiver enable, active-low. Low enables the receiver output RO; high disables (tri-states) the receiver.
3	DE	input	Driver enable, active-high. High enables the differential A/B driver; low tri-states the driver outputs.
4	DI	input	Driver (transmitter) data input. With DE high: DI low drives A low and B high; DI high drives A high and B low.
5	GND	power_in	Ground reference for the device.
6	A	bidirectional	Non-inverting RS-485/RS-422 bus pin. Receiver non-inverting input and driver non-inverting output. -7 V to +12 V common-mode range, 32 kΩ typical input impedance.
7	B	bidirectional	Inverting RS-485/RS-422 bus pin. Receiver inverting input and driver inverting output. -7 V to +12 V common-mode range, 32 kΩ typical input impedance.
8	VCC	power_in	Supply pin, typically 5 V. Recommended operating range 3.0 V to 5.5 V; absolute maximum 8.0 V. Typical supply current 155-160 µA at no load.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

JSM485ESA

CAD (KiCad official)

Symbol: JSM485ESA
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`jsm485esa.step`	122 KB	You want the bare part, or you mark your own boards.
`jsm485esa-etched.step`	2.1 MB	You want the part with `JSM485ESA` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 510 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: JSMSEMI datasheet (11 pp, sha256 9c1f59f8c7e5b077, 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