# HE2028A50GR

**HEERMICR** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-252

HE2028A50GR from HEERMICR, in a TO-252. 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 | VIN | power_in | Regulator input; accepts 3.0V to 50V per the electrical table, with a recommended ceramic input capacitor placed close to the pin. |
| 2 | GND | power_in | Ground; the middle lead and the metal tab are both labelled GND in the TO252 top view, and it should be a single-point ground return. |
| 3 | VOUT | power_out | Regulated 5.0V output (HE2028A50GR) delivering up to 800mA with ±2% accuracy, needing a 10µF ceramic output capacitor for stability. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HEERMICR |
| Package | TO-252 |
| 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 |
|---|---|---|---|---|---|---|---|
| Input Voltage | VIN | 3 |  | 50 | V |  | 4 |
| Output Voltage | VOUT | -2 |  | 2 | % | VIN=12V, IOUT=10mA | 4 |
| Quiescent Current | IQ |  | 2 | 5 | μA | VIN=12V, no load | 4 |
| Shutdown Ground Current | ISD |  |  | 0.1 | μA | VIN=0V | 4 |
| VOUT Shutdown Leakage Current | ILEAK |  |  | 0.1 | μA | VOUT = 0V | 4 |
| EN Threshold Voltage, Logic-High | VIH | 1 |  |  | V | VIN=5.0V, IOUT=1mA | 4 |
| EN Threshold Voltage, Logic-Low | VIL |  |  | 0.4 | V | VIN=5.0V | 4 |
| Current Limit | ILIMIT | 300 | 450 |  | mA | VIN= VOUT +1V | 4 |
| Supply voltage at VIN (recommended) | VIN |  |  | 30 | V |  | 3 |
| Operating junction temperature range | Tj | -40 |  | 125 | °C |  | 3 |
| Operating free air temperature range | TA | -40 |  | 85 | °C |  | 3 |
| Input Voltage (absolute maximum) | VIN | -0.3 |  | 50 | V | relative to VSS | 3 |
| Output Voltage (absolute maximum) | VOUT | -0.3 |  | 6 | V | relative to VSS | 3 |
| Output Current (absolute maximum) | IOUT |  |  | 800 | mA |  | 3 |
| Power Dissipation | Pd |  |  | 1800 | mW | TO252-3L package | 3 |
| Operating Temperature | Topr | -40 |  | 85 | ℃ |  | 3 |
| Storage Temperature | Tstg | -40 |  | 125 | ℃ |  | 3 |
| Soldering Temperature | Tsolder |  |  | 260 | ℃ | 10 s | 3 |
| ESD Human Body Model | V(ESD-HBM) | -4000 |  | 4000 | V | HBM, ANSI/ESDA/JEDEC JS-001-2014, Class 2 | 3 |
| ESD Charged Device Model | V(ESD-CDM) | -200 |  | 200 | V | CDM, ANSI/ESDA/JEDEC JS-002-2014, Class C0b | 3 |
| Latch-up Current | ILATCH-UP | -150 |  | 150 | mA | JEDEC STANDARD NO.78E, Temperature Class I | 3 |
| Thermal Resistance Junction-to-Ambient | RθJA |  | 150 |  | ℃/W | TO252-3L, per JESD 51-7 | 3 |

## CAD (KiCad official)

- Symbol: `HE2028A50GR`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: TO-252 (KiCad packages3D, STEP)
- 3D model files: `he2028a50gr-etched.step` / `he2028a50gr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `he2028a50gr.step` / `he2028a50gr.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/8590457369692958720) (9 pp, sha256 `04db718670775aea`, retrieved 2026-10-19, 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/he2028a50gr-datasheet.pdf)