HT7550 from TWGMC, 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	Ground / common return for input and output. Pin 1 of the SOT-23 package (bottom-left when viewed from the top with the marking upright).
2	VOUT	power_out	Regulated fixed +5.0V output (typ. 5.0V, min 4.85V, max 5.15V at IOUT=10mA). Sources up to 100mA (rated) / 150mA (typ.). A small output capacitor (≥1µF) is recommended for stability.
3	VIN	power_in	Unregulated supply input. Operating input up to 24V (line-regulation spec limit), absolute maximum +30V. Typical dropout ~100mV at 1mA. An input decoupling capacitor is recommended.

Key specifications

Parameter	Value
Manufacturer	TWGMC
Package	SOT-23
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

HT7550
HT7550-1

CAD (KiCad official)

Symbol: HT7550
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
`ht7550.step`	59 KB	You want the bare part, or you mark your own boards.
`ht7550-etched.step`	1.1 MB	You want the part with `HT7550` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 268 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: TWGMC datasheet (12 pp, sha256 d0d358ba595fe029, 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