component

HE2021A25HMR

Public Unreviewed

by Ray

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

componentpmiche2021a25hmr
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Contents

README

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HE2021A25HMR

HEERMICR · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-3

HE2021A25HMR from HEERMICR, in a SOT-23-3. 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 reference. Common return for input and output. Connect to a single-point ground per the basic application circuit.
2 VOUT power_out Regulated output. Fixed 2.5V (±1%) on the HE2021A25HMR variant, capable of sourcing up to 200mA. Requires a 10µF output capacitor to ground for stability per the basic application circuit.
3 VIN power_in Unregulated supply input. Absolute maximum 35V; recommended operating range from VOUT + dropout up to 35V. Bypass with a 10µF capacitor to ground close to the pin.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • HE2021A25HMRM
  • HE2021A25HMR
  • HE2021A25HMRMG
  • HE2021A25HMRT
  • HE2021A25HMRTR
  • HE2021A25HMRTG
  • HE2021A25HMRP
  • HE2021A25HMRPR
  • HE2021A25HMRPG
  • HE2021A25HMRPB
  • HE2021A25HMRM5
  • HE2021A25HMR5XX1 marking

CAD (KiCad official)

  • Symbol: HE2021A25HMR
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT-23-3 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
he2021a25hmr.step 59 KB You want the bare part, or you mark your own boards.
he2021a25hmr-etched.step 1.9 MB You want the part with HE2021A25HMR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 491 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 7e6b713cd5492e1f, 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