# HE2021A25HPR

**HEERMICR** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3

HE2021A25HPR from HEERMICR, in a SOT-89-3. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Ground pin of the regulator. |
| 2 | VIN | power_in | Input supply voltage pin; absolute maximum supply voltage is 35V and the stated input voltage maximum is 35V. |
| 3 | VOUT | power_out | Regulated output pin delivering up to 200mA, fixed 2.5V output for the HE2021A25 version. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HEERMICR |
| Package | SOT-89-3 |
| Category | Power Management (PMIC) |
| Pins | 3 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply Voltage |  | -0.3 |  | 35 | V |  | 2 |
| Operating Temperature |  | -40 |  | 85 | ℃ |  | 2 |
| Storage Temperature |  | -50 |  | 125 | ℃ |  | 2 |
| Thermal Resistance (Junction to Ambient), SOT89 package | θJA |  |  | 200 | ℃/W | Assume no ambient airflow, no heat sink | 2 |
| Power Dissipation, SOT89 package | PD |  |  | 0.5 | W | Ta= 25℃ | 2 |

## CAD (KiCad official)

- Symbol: `HE2021A25HPR`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3 (KiCad packages3D, STEP)
- 3D model files: `he2021a25hpr-etched.step` / `he2021a25hpr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `he2021a25hpr.step` / `he2021a25hpr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HEERMICR datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590238344786305024) (9 pp, sha256 `7e6b713cd5492e1f`, retrieved 2026-10-17, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/he2021a25hpr-datasheet.pdf)