TP321-TR from UMW, 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	+IN	input	Non-inverting analog input to the op-amp. Rail-to-rail common-mode range extending from V- - 0.1V to V+ + 0.1V; input bias current typically 10pA. Protected by ESD diodes to each supply; limit input current to <10mA if driven beyond the rails.
2	-VS	power_in	Negative supply rail (V-). Typically tied to ground in single-supply operation, or to the negative rail for split-supply operation. Total supply voltage (V+ to V-) must not exceed 6.6V absolute maximum; recommended range 2.1V to 6.0V.
3	-IN	input	Inverting analog input to the op-amp. Rail-to-rail common-mode range extending from V- - 0.1V to V+ + 0.1V; input bias current typically 10pA. Protected by ESD diodes to each supply; limit input current to <10mA if driven beyond the rails.
4	OUT	output	Rail-to-rail amplifier output. Output swings to within about 5mV of either supply rail into a 100kΩ load; short-circuit current ±40mA (sink or source). Indefinite short-circuit duration provided junction temperature is kept below 150°C.
5	+VS	power_in	Positive supply rail (V+). Operating supply range 2.1V to 6.0V (6.6V absolute max V+ to V-). Bypass locally with a low-ESR ceramic capacitor to -VS for best PSRR (typ. 90dB).

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

TP321-TR
TP321-TRTP358

CAD (KiCad official)

Symbol: TP321-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
`tp321-tr.step`	85 KB	You want the bare part, or you mark your own boards.
`tp321-tr-etched.step`	1.3 MB	You want the part with `TP321-TR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 345 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: UMW datasheet (12 pp, sha256 68ddde9e9628d435, 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