AP2120N-1.8TRG1 from Diodes Incorporated AP2120N 1 8TRG1, in a SOT-23. 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	GND	power_in	Ground reference for the regulator. Connect directly to the system ground plane; this pin also serves as the reference return for the internal voltage reference and error amplifier.
2	VOUT	power_out	Regulated output voltage pin (1.8 V fixed for the -1.8 option). Delivers up to 150 mA continuous (250 mA current limit). Requires a minimum 1 μF output capacitor with ESR between 0.01 Ω and 100 Ω for stability; ceramic capacitors are recommended.
3	VIN	power_in	Unregulated input supply pin. Recommended operating range 2 V to 6 V (absolute max 6.5 V). A 1 μF input bypass capacitor is required close to the pin.

Key specifications

Parameter	Value
Manufacturer	Diodes Incorporated AP2120N 1 8TRG1
Package	SOT-23
Category	PMIC
Pins	3

Ordering variants

AP2120N-1.8TRG1

CAD (KiCad official)

Symbol: AP2120N-1.8TRG1
Footprint: Package_TO_SOT_SMD:SOT-23
3D model: SOT-23 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Diodes Incorporated AP2120N 1 8TRG1 datasheet (19 pp, sha256 66be4c8fbb47afd5, retrieved 2026-08-17, tier: manufacturer)
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