AP2210K-3.3TRG1 from Diodes, 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	Unregulated supply input. Recommended operating range 4.3V (VOUT+1V) to 13.2V for the 3.3V version; absolute maximum 15V. Bypass with a 1.0µF ceramic capacitor (CIN) to GND close to the pin.
2	GND	power_in	Device ground return. Carries the ground-pin quiescent current (typ. 100µA at IOUT=100µA, up to ~4mA at IOUT=300mA). Connect to the system ground plane.
3	EN	input	Enable input, CMOS/TTL compatible. Logic high (VEN ≥ 2.0V) enables the regulator; logic low (VEN ≤ 0.4V) puts the device in shutdown (ISTD ≤ 1µA). Absolute maximum VEN = 15V; recommended 0 to 13.2V. May be tied to VIN for always-on operation.
4	BYP	passive	Bypass capacitor pin for low-noise operation on the fixed-output (3.3V) version. Connect a small ceramic capacitor (typ. 100pF, CBYP) from BYP to GND to filter the internal bandgap reference and reduce output noise. On the ADJ variant this same pin is repurposed as the ADJ feedback input.
5	VOUT	power_out	Regulated 3.3V output, up to 300mA. Accuracy ±1% (typ), ±2% over full temperature. Requires a 2.2µF ceramic output capacitor (COUT) to GND for stability. Internally current-limited (~450mA typ) and thermally protected.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

AP2210K-3.3TRG1
AP2210K-3.3TRG1K
AP2210K-3.3TRG1N

CAD (KiCad official)

Symbol: AP2210K-3.3TRG1
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
`ap2210k-3-3trg1.step`	85 KB	You want the bare part, or you mark your own boards.
`ap2210k-3-3trg1-etched.step`	2.5 MB	You want the part with `AP2210K-3.3TRG1` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 619 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: Diodes datasheet (30 pp, sha256 8d83ef61593fff5e, 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