HE2028A33GR from HEERMICR, in a TO-252. 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	Unregulated input supply. Operating range 3.0V to 50V (recommended max 30V for continuous use). Decouple with a 10µF ceramic capacitor placed close to the pin.
2	VOUT	power_out	Regulated 3.3V output, ±2% accuracy, up to 800mA. Requires a 10µF X7R/X5R ceramic output capacitor placed close to the pin for stability. Dropout is 360mV at 100mA.
3	GND	power_in	Ground reference and thermal pad (exposed tab). Connect to a wide copper pour for thermal dissipation; the tab conducts heat away from the die (θJA = 150°C/W for TO-252-3L).

Key specifications

Parameter	Value
Manufacturer	HEERMICR
Package	TO-252
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

HE2028A33GR
HE2028A33GRFR

CAD (KiCad official)

Symbol: HE2028A33GR
Footprint: Package_TO_SOT_SMD:TO-252-2
3D model: TO-252 (KiCad packages3D, STEP)

Provenance

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

Datasheet: HEERMICR datasheet (9 pp, sha256 d8423fb2deb81247, 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