H7210-33M5R 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 range 2.5V to 5.5V (absolute max 8V). Requires a 10uF ceramic input capacitor to GND placed close to the pin for stable power input.
2	GND	power_in	Ground reference pin. Connect to system ground; return path for both CIN and COUT ceramic capacitors.
3	CE	input	Chip Enable input. CMOS-hysteresis inverter-style logic input; drive high to enable the regulator, low to shut down the internal circuitry. When CE is low, the built-in fast-discharge pull-down pulls VOUT low. CE input voltage range 0V to 5.5V. Tie to VIN or GND (do not float) to avoid increased supply current.
4	NC	unconnected	No Connection. Leave floating or tie to ground; not internally bonded to any signal.
5	VOUT	power_out	Regulated output pin. 3.3V (±2%) fixed output for the -33 option, capable of up to 500mA (Vin-Vout=1V). Requires a >=10uF low-ESR ceramic output capacitor placed as close as possible to VOUT and GND for phase compensation and transient response.

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.

H7210-33M5R

CAD (KiCad official)

Symbol: H7210-33M5R
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Shanghai Siproin Microelectronics datasheet (6 pp, sha256 d68700857f3166ee, 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