TP2121-TR from 3PEAK, 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 swing extends to within millivolts of each supply rail; can source or sink up to 20 mA of load current.
2	-Vs	power_in	Negative power supply. Normally tied to GND. May be tied to a voltage other than ground when the total (+Vs)-(-Vs) supply voltage is 1.8 V to 5.5 V. Bypass with a 0.1 µF capacitor placed as close to the pin as possible when not grounded.
3	+In	input	Non-inverting input of the amplifier. Input voltage range extends from (-Vs) - 0.3 V to (+Vs) + 0.3 V (rail-to-rail input).
4	-In	input	Inverting input of the amplifier. Voltage range extends from (-Vs) - 0.3 V to (+Vs) + 0.3 V.
5	+Vs	power_in	Positive power supply. Typically 1.8 V to 5.5 V single-supply (absolute max 6.5 V). Split supplies are supported when (+Vs)-(-Vs) is between 1.8 V and 5.5 V. Bypass with 0.1 µF between supply pins or between supply and ground, as close to the part as possible.

Key specifications

Parameter	Value
Manufacturer	3PEAK
Package	SOT-23-5
Category	Op-amp/Cmp
Pins	5

Ordering variants

Same part, different packaging or reel option.

TP2121-TR
TP2121-TRCR
TP2121-TRSR
TP2121-TRVR

CAD (KiCad official)

Symbol: TP2121-TR
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
`tp2121-tr.step`	85 KB	You want the bare part, or you mark your own boards.
`tp2121-tr-etched.step`	1.4 MB	You want the part with `TP2121-TR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 353 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: 3PEAK datasheet (28 pp, sha256 88fb863dd90ac93f, 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