COS4561TR from COSINE, in a SOT-23-6. 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	IN	input	Digital control input. TTL/CMOS logic compatible: at 5V supply VIL max 0.5V and VIH min 1.3V; at 12V supply VIL max 1.4V and VIH min 2.3V. Selects which analog throw (NO or NC) is connected to COM.
2	V+	power_in	Positive supply voltage input. Recommended operating range 3.0V to 16V (absolute max 17V). Supply current is 0.01μA typical.
3	GND	power_in	Ground reference (0V). Return for both the supply and the analog switch signals.
4	NC	passive	Normally Closed analog throw terminal. Connected to COM when IN=0 (logic low). Rail-to-rail analog signal range 0 to V+; on-resistance 3.6Ω typ at 12V (11Ω typ at 5V). Off-leakage 1nA max at 25°C.
5	COM	passive	Common analog terminal of the SPDT switch. Routed to either NC (when IN=0) or NO (when IN=1) with break-before-make timing. Rail-to-rail signal handling 0 to V+.
6	NO	passive	Normally Open analog throw terminal. Connected to COM when IN=1 (logic high). Rail-to-rail analog signal range 0 to V+; on-resistance 3.6Ω typ at 12V. Off-leakage 1nA max at 25°C.

Key specifications

Parameter	Value
Manufacturer	COSINE
Package	SOT-23-6
Category	Comm/UART
Pins	6

Ordering variants

Same part, different packaging or reel option.

COS4561TR

CAD (KiCad official)

Symbol: COS4561TR
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`cos4561tr.step`	97 KB	You want the bare part, or you mark your own boards.
`cos4561tr-etched.step`	1.9 MB	You want the part with `COS4561TR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 452 faces against 117 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: COSINE datasheet (7 pp, sha256 115122fd41935e8a, 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