component

HE2021A33HMR

Public Unreviewed

by Ray

HEERMICR Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23. Datasheet-verified pinout, KiCad symbol/footprint/3D.

componentpmiche2021a33hmr
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Symbol & Footprint

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Contents

README

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HE2021A33HMR

HEERMICR · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23

HE2021A33HMR from HEERMICR, 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 Device ground reference. Tie to system single-point ground; return path for the internal reference, error amplifier, and output pass FET.
2 VOUT power_out Regulated 3.3 V output (3.267 V min / 3.300 V typ / 3.333 V max at IOUT=10 mA). Sources up to 200 mA. Requires a 10 µF output capacitor to ground for stability per the application circuit.
3 VIN power_in Unregulated supply input. Operating range from VOUT+dropout up to 35 V absolute max (typ dropout 10 mV at 1 mA, 50 mV at 10 mA). Decouple with a 10 µF capacitor to GND close to the pin.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • HE2021A33HMR
  • HE2021A33HMRHMG
  • HE2021A33HMRHTR
  • HE2021A33HMRHTG
  • HE2021A33HMRHPR
  • HE2021A33HMRHPG
  • HE2021A33HMRHM5R
  • HE2021A33HMRHM5G

CAD (KiCad official)

  • Symbol: HE2021A33HMR
  • 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
he2021a33hmr.step 59 KB You want the bare part, or you mark your own boards.
he2021a33hmr-etched.step 2.1 MB You want the part with HE2021A33HMR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 521 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: HEERMICR datasheet (9 pp, sha256 8d7e2c2e64e2ae10, 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