COS721TR from COSINE, in a SOT-23-5. 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 swing extends to within millivolts of each supply rail (typ 1mV with RL=100kΩ, 8mV with RL=10kΩ, 40mV with RL=2kΩ). Short-circuit source/sink current ~21/22 mA.
2	-Vs	power_in	Negative power supply or ground. Total supply (+Vs to -Vs) is 2.5V to 5.5V (absolute max 6.0V). If not connected to ground, bypass with a 0.1μF ceramic capacitor placed as close to the pin as possible.
3	+IN	input	Non-inverting input of the amplifier. Voltage range extends from -Vs -0.3V to +Vs +0.3V. Rail-to-rail input; input bias current typ ±2.5 pA. Input terminals are diode-clamped to the supply rails; limit current to 10mA if input swings >0.5V beyond a rail.
4	-IN	input	Inverting input of the amplifier. Voltage range extends from -Vs -0.3V to +Vs +0.3V. Rail-to-rail input; input bias current typ ±2.5 pA. Input terminals are diode-clamped to the supply rails; limit current to 10mA if input swings >0.5V beyond a rail.
5	+Vs	power_in	Positive power supply, 2.5V to 5.5V (single supply) or ±1.25V to ±2.75V (dual supply). Bypass with a 0.1μF ceramic capacitor placed as close to the pin as possible; a 2.2μF tantalum may be added for improved performance.

Key specifications

Parameter	Value
Manufacturer	COSINE
Package	SOT-23-5
Category	Op-amp/Cmp
Pins	5

Ordering variants

Same part, different packaging or reel option.

COS721TR
COS721TRSR

CAD (KiCad official)

Symbol: COS721TR
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`cos721tr.step`	85 KB	You want the bare part, or you mark your own boards.
`cos721tr-etched.step`	1.5 MB	You want the part with `COS721TR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 369 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 c3bf767fb360554e, 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