DIO20321ST5 from DIOO, 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 swing; typical output current 48mA at V+=5V; closed-loop output impedance ~2.6Ω at 100kHz.
2	-Vs	power_in	Negative supply rail (typically GND in single-supply operation). Supply voltage range 2.5V to 5.5V referenced between +Vs and -Vs.
3	+IN	input	Non-inverting analog input. Common-mode range -0.1V to (V+)+0.1V (rail-to-rail); input bias current typically 1pA.
4	-IN	input	Inverting analog input. Common-mode range -0.1V to (V+)+0.1V; input offset voltage typically 0.7mV (±3.5mV max).
5	+Vs	power_in	Positive supply rail. Operating range 2.5V to 5.5V; absolute maximum 7.5V. Recommended bypass with 10µF and 0.1µF capacitors to -Vs.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

DIO20321ST5
DIO20321ST5SO8
DIO20321ST5MP8
DIO20321ST5TP8
DIO20321ST5SO14
DIO20321ST5TP14
DIO20321ST5QN20

CAD (KiCad official)

Symbol: DIO20321ST5
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: DIOO datasheet (8 pp, sha256 7c7f8bb428c64ba3, 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