H7211-33M5R from Shanghai Siproin Microelectronics, 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	Power input pin. Operating input voltage range 2.0V to 6.0V (absolute max -0.3V to 7V). Bypass to VSS with a low-ESR ceramic capacitor (typically 1uF to 10uF).
2	VSS	power_in	Ground reference for the regulator. Common return for input, output, and CE.
3	CE	input	Chip Enable input. CE high (>=1.5V, up to VIN) enables the regulator; CE low (<=0.3V) puts the device into shutdown (ISTBY typ 0.1uA) and activates the output-capacitor discharge shunt (~80 ohm).
4	NC	unconnected	No internal connection on the SOT23-5 package. May be left floating or tied to VSS for mechanical stability.
5	VOUT	power_out	Regulated LDO output. Fixed voltage per orderable suffix (-33 = 3.3V), up to 300mA. Requires a low-ESR ceramic output capacitor (typically 1uF to 10uF); internal 80 ohm discharge shunt pulls VOUT down when CE is low.

Key specifications

Parameter	Value
Manufacturer	Shanghai Siproin Microelectronics
Package	SOT-23-5
Category	PMIC
Pins	5

Ordering variants

Same part, different packaging or reel option.

H7211-33M5R
H7211-33M5RDR

CAD (KiCad official)

Symbol: H7211-33M5R
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
`h7211-33m5r.step`	85 KB	You want the bare part, or you mark your own boards.
`h7211-33m5r-etched.step`	1.9 MB	You want the part with `H7211-33M5R` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 470 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: Shanghai Siproin Microelectronics datasheet (9 pp, sha256 b0219dac2623b496, 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