RS2266XM from Jiangsu RUNIC Tech, in a MSOP-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	S1	bidirectional	Analog switch 1 source-side I/O. Bidirectional signal terminal for switch 1; interchangeable with D1. Signal range 0 to Vcc.
2	D1	bidirectional	Analog switch 1 drain-side I/O. Bidirectional signal terminal for switch 1; interchangeable with S1. Signal range 0 to Vcc.
3	SEL2	input	Digital control input for switch 2. L = switch OFF, H = switch ON. TTL/CMOS compatible; VIH ≥ 1.5V at 5V, VIL ≤ 0.6V at 5V.
4	GND	power_in	Ground reference for the device.
5	S2	bidirectional	Analog switch 2 source-side I/O. Bidirectional signal terminal for switch 2; interchangeable with D2. Signal range 0 to Vcc.
6	D2	bidirectional	Analog switch 2 drain-side I/O. Bidirectional signal terminal for switch 2; interchangeable with S2. Signal range 0 to Vcc.
7	SEL1	input	Digital control input for switch 1. L = switch OFF, H = switch ON. TTL/CMOS compatible; VIH ≥ 1.5V at 5V, VIL ≤ 0.6V at 5V.
8	VCC	power_in	Supply voltage input. Operating range 1.8V to 5.5V; absolute maximum 6.0V.

Key specifications

Parameter	Value
Manufacturer	Jiangsu RUNIC Tech
Package	MSOP-8
Category	Interface
Pins	8

Ordering variants

Same part, different packaging or reel option.

RS2266XM
RS2266XK

CAD (KiCad official)

Symbol: RS2266XM
Footprint: Package_SO:MSOP-8_3x3mm_P0.65mm
3D model: MSOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`rs2266xm.step`	123 KB	You want the bare part, or you mark your own boards.
`rs2266xm-etched.step`	2.1 MB	You want the part with `RS2266XM` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 494 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: Jiangsu RUNIC Tech datasheet (13 pp, sha256 9326e6d3b16a58fa, 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