AP3429KTTR-G1 from Diodes Incorporated, in a TSOT-25. 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	EN	input	Enable control input. Force this pin above 1.5V to enable the chip; below 0.4V shuts down the device (Ish < 1uA). VEN abs max: -0.3V to VIN+0.3V.
2	GND	power_in	Ground pin. Device return for internal power MOSFETs and control logic.
3	LX	power_out	Switching node. Drains of the internal main (PFET, ~110 mOhm) and synchronous (NFET, ~80 mOhm) power MOSFETs. Connect to the external inductor. VLX abs max: -0.3V to VIN+0.3V.
4	VIN	power_in	Bias supply. Chip main power supply pin. Input voltage range 2.7V to 5.5V (abs max -0.3V to 6V). Bypass with a 22uF ceramic capacitor to GND.
5	FB	input	Feedback voltage to internal error amplifier. Regulated to 0.6V threshold (typ; 0.588V to 0.612V). Connect to output via a resistor divider to set VOUT = 0.6V * (1 + R1/R2). FB leakage < 0.2uA.

Key specifications

Parameter	Value
Manufacturer	Diodes Incorporated
Package	TSOT-25
Category	PMIC
Pins	5

Ordering variants

AP3429KTTR-G1
AP3429KTTR-G1AKTTR-G1

CAD (KiCad official)

Symbol: AP3429KTTR-G1
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: TSOT-25 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ap3429kttr-g1.step`	85 KB	You want the bare part, or you mark your own boards.
`ap3429kttr-g1-etched.step`	2.1 MB	You want the part with `AP3429KTTR-G1` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 532 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 Incorporated datasheet (11 pp, sha256 81148b4230491ef2, 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