COS12A12511 from COSINE, 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	COM	bidirectional	Common analog terminal of the SPDT switch. Bidirectional analog I/O; connects to either NC (when IN=L) or NO (when IN=H). Signal range V- to V+.
2	NC	bidirectional	Normally-closed analog terminal. Bidirectional analog I/O connected to COM when logic control IN is LOW. Signal range V- to V+.
3	GND	power_in	Ground, 0 V reference for the logic input and switch circuitry.
4	V+	power_in	Most positive power supply. +3 V to +16 V (single supply, COS12A12511S) or +3 V to +8 V (dual supply, COS12A12511). Sets the upper analog signal rail.
5	N.C.	unconnected	No connect. Not internally connected; leave floating or tie to any convenient net.
6	IN	input	Digital logic control input selecting the switch throw. IN=LOW connects COM to NC; IN=HIGH connects COM to NO. TTL/CMOS compatible (VIL ≤ 0.8 V, VIH ≥ 2.4 V at 5 V supply).
7	V-	power_in	Most negative power supply. Used only in dual-supply applications (down to -8 V for COS12A12511); must be tied to GND for single-supply operation (COS12A12511S).
8	NO	bidirectional	Normally-open analog terminal. Bidirectional analog I/O connected to COM when logic control IN is HIGH. Signal range V- to V+.

Key specifications

Parameter	Value
Manufacturer	COSINE
Package	MSOP-8
Category	Comm/UART
Pins	8

Ordering variants

Same part, different packaging or reel option.

COS12A12511
COS12A12511S

CAD (KiCad official)

Symbol: COS12A12511
Footprint: Package_SO:MSOP-8_3x3mm_P0.65mm
3D model: MSOP-8 (KiCad packages3D, STEP)

Provenance

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

Datasheet: COSINE datasheet (8 pp, sha256 05ec697909749d77, 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