COS8051SOT from COSINE, in a SOT23-5. 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	OUT	output	Amplifier output. Output voltage range extends to within millivolts of each supply rail (10mV @ RL=10kΩ, 25mV @ RL=2kΩ, 200mV @ RL=150Ω). Short-circuit source current 100mA, sink 120mA.
2	-Vs	power_in	Negative power supply or ground. For single-supply use, tie to GND; for dual-supply use, bypass to ground with a 0.1µF ceramic capacitor placed close to the pin. Supply range +Vs to -Vs is 2.5V to 5.5V.
3	+IN	input	Non-inverting input of the amplifier. Common-mode voltage range is -Vs to +Vs (rail-to-rail). Absolute voltage range on this pin is -Vs -0.3V to +Vs +0.3V; input bias current typically ±3pA.
4	-IN	input	Inverting input of the amplifier. Voltage range on this pin is -Vs -0.3V to +Vs +0.3V (diode-clamped to supplies, limit current to 10mA if driven beyond rails). Input offset voltage typ ±2mV, max ±20mV.
5	+Vs	power_in	Positive power supply. Operating range 2.5V to 5.5V (single supply) or ±1.25V to ±2.25V (dual supply). Bypass to ground with a 0.1µF ceramic capacitor placed as close to the pin as possible. Quiescent current typ 2.6mA at VS=5V.

Key specifications

Parameter	Value
Manufacturer	COSINE
Package	SOT23-5
Category	Op-amp/Cmp
Pins	5

Ordering variants

Same part, different packaging or reel option.

COS8051SOT
COS8051SOTSR
COS8051SOTMR
COS8051SOTSOP
COS8051SOTTR

CAD (KiCad official)

Symbol: COS8051SOT
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`cos8051sot.step`	85 KB	You want the bare part, or you mark your own boards.
`cos8051sot-etched.step`	2.3 MB	You want the part with `COS8051SOT` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 530 faces against 102 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 (10 pp, sha256 59babd131cdd748c, 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