AP2125KS-2.8TRG1 from Diodes Incorporated, in a SC-70-5. 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	VIN	power_in	Unregulated input voltage. Operating range VOUT+0.5V to 6V; absolute maximum 6.5V. Bypass with 1µF ceramic to GND close to the pin.
2	GND	power_in	Device ground reference for the internal reference, error amplifier, and output feedback divider.
3	CE	input	Active-high chip-enable input. Logic high (>=1.5V) enables the regulator; logic low (<=0.4V) shuts it down (ISTD ~0.01µA typ). Allowed range -0.3V to VIN+0.3V; do not leave floating.
4	NC	unconnected	No internal connection. Leave floating or tie to GND as convenient for layout.
5	VOUT	power_out	Regulated 2.8V output, 300mA (min). Stable with low-ESR ceramic capacitors; 1µF COUT recommended. Short-circuit current-limited (~50mA at VOUT=0V) with thermal protection at +160°C.

Key specifications

Parameter	Value
Manufacturer	Diodes Incorporated
Package	SC-70-5
Category	PMIC
Pins	5

Ordering variants

Same part, different packaging or reel option.

AP2125KS-2.8TRG1
AP2125KS-2.8TRG1K
AP2125KS-2.8TRG1W

CAD (KiCad official)

Symbol: AP2125KS-2.8TRG1
Footprint: Package_TO_SOT_SMD:SOT-353_SC-70-5
3D model: SC-70-5 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Diodes Incorporated datasheet (25 pp, sha256 73dd4f47f543db12, 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