H7550-H# from Shanghai Siproin Microelectronics, in a SOT-23-3. 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 and negative supply reference. Connect to the common/single-point ground return of the regulator.
2	VIN	power_in	Unregulated supply input. Operating input range 4.75V to 40V (absolute maximum 45V). A 10µF input capacitor (C1) to GND is recommended.
3	VOUT	power_out	Regulated 5.0V output (±2% tolerance). Typical output current 100mA, short-circuit current ~180mA. A 10µF output capacitor (C2) to GND is required for stability.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

H7550-H#T
H7550-H#P
H7550-H#M

CAD (KiCad official)

Symbol: H7550-H#
Footprint: Package_TO_SOT_SMD:SOT-23-3
3D model: SOT-23-3 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`h7550-h.step`	59 KB	You want the bare part, or you mark your own boards.
`h7550-h-etched.step`	1.4 MB	You want the part with `H7550-H#` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 347 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 (11 pp, sha256 942d23c6184c5e31, 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