COS8551TRA 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. Rail-to-rail output; voltage swing extends to within ~5 mV of each supply rail (RL=100k) or ~15 mV (RL=10k). Short-circuit source/sink current ~+/-7 mA.
2	-Vs	power_in	Negative power supply or ground. If not connected to ground, bypass with a 0.1 uF capacitor as close to the part as possible. Supply range 1.8 V to 5.5 V total (+Vs to -Vs), 6 V absolute maximum.
3	+IN	input	Non-inverting input of the amplifier. Rail-to-rail input; common-mode voltage range extends from -Vs - 0.3 V to +Vs + 0.3 V. Input bias current +/-100 pA typical.
4	-IN	input	Inverting input of the amplifier. Voltage range -Vs - 0.3 V to +Vs + 0.3 V. Input bias current +/-100 pA typical; internal diode clamps to supply rails limit input current to 10 mA.
5	+Vs	power_in	Positive power supply. Operating range 1.8 V to 5.5 V (referenced to -Vs). Bypass with a 0.1 uF capacitor placed as close to the pin as possible, between +Vs and -Vs (or between +Vs and GND).

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.

COS8551TRA
COS8551TRB
COS8551TRC
COS8552SRA
COS8552SR
COS8552SRC
COS8552SRD
COS8552MRA
COS8552MRB
COS8552MRC
COS8554SR
COS8554SRB
COS8554SRC
COS8554TRA
COS8554TRB
COS8554TRC

CAD (KiCad official)

Symbol: COS8551TRA
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
`cos8551tra.step`	85 KB	You want the bare part, or you mark your own boards.
`cos8551tra-etched.step`	2.1 MB	You want the part with `COS8551TRA` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 502 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 (12 pp, sha256 845c61f20f164396, 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