AP2126K-ADJTRG1 from Diodes Incorporated, 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	VIN	power_in	Input supply pin. Operating range 3.0V to 6V (absolute max 6.5V). Bypass to GND with a 1µF low-ESR ceramic capacitor.
2	GND	power_in	Device ground reference. Connect to the system ground plane.
3	Shutdown	input	Active-high enable/shutdown control (labeled 'Shutdown' with overbar in datasheet, functions as active-high enable). Logic HIGH ≥1.5V enables the regulator; LOW ≤0.4V disables it and engages the ~60Ω auto-discharge MOSFET on VOUT. Internal ~3MΩ pull-down. Input range -0.3V to VIN+0.3V.
4	ADJ	input	Feedback/adjust input. Connect to the R1/R2 external divider from VOUT to GND to set the output voltage: VOUT = 1.25 × (1 + R1/R2). Internal reference is 1.25V (±2%).
5	VOUT	power_out	Regulated output. Delivers up to 300mA (400mA typ current-limit onset, 50mA short-circuit limit). Requires ≥1µF low-ESR ceramic output capacitor for stability.

Key specifications

Parameter	Value
Manufacturer	Diodes Incorporated
Package	SOT-23-5
Category	PMIC
Pins	5

Ordering variants

AP2126K-ADJTRG1

CAD (KiCad official)

Symbol: AP2126K-ADJTRG1
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: Diodes Incorporated datasheet (9 pp, sha256 a82f55ffe0074204, 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