H7133-1 from Shanghai Siproin Microelectronics, 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	Device ground / common return for the internal reference, error amplifier, and pass FET. Tie to the system ground plane; place the input and output capacitor returns close to this pin to minimize regulation error.
2	VIN	power_in	Unregulated input supply. Operating range up to 15 V (absolute max 18 V). For the H7133-1 (3.3 V output) line regulation is specified over 4.5 V ≤ VIN ≤ 16 V. Decouple with a ceramic/electrolytic capacitor (typ. 10 µF) to GND close to the pin.
3	VOUT	power_out	Regulated 3.3 V output (3.234 V min / 3.300 V typ / 3.366 V max at IOUT=10 mA). Supplies up to 50 mA. Requires an output capacitor (typ. 10 µF) to GND for stability. Dropout ≈ 30 mV at 1 mA.

Key specifications

Parameter	Value
Manufacturer	Shanghai Siproin Microelectronics
Package	SOT-23
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

H7133-1TR
H7133-1TG
H7133-1PR
H7133-1PG
H7133-1NR
H7133-1NG

CAD (KiCad official)

Symbol: H7133-1
Footprint: Package_TO_SOT_SMD:SOT-23
3D model: SOT-23 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`h7133-1.step`	59 KB	You want the bare part, or you mark your own boards.
`h7133-1-etched.step`	1.1 MB	You want the part with `H7133-1` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 282 faces against 69 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: Shanghai Siproin Microelectronics datasheet (16 pp, sha256 b56d63e4e3666e63, 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