# HE2021A50HMR

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

HE2021A50HMR from HEERMICR, in a SOT-23. 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, shown at bottom-left of the SOT23-3 top view; the datasheet gives no separate ground current limit beyond a typical 2.0 µA, max 5.0 µA no-load current consumption for the 5.0V type. |
| 2 | VOUT | power_out | Regulated 5.0V output (4.95V to 5.05V at IOUT=10mA), rated for 200mA output current. |
| 3 | VIN | power_in | Supply input, absolute maximum -0.3V to 35V, with an input voltage rating of 35V maximum. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HEERMICR |
| Package | SOT-23 |
| 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 |
|---|---|---|---|---|---|---|---|
| Output Voltage | VOUT | 4.95 | 5 | 5.05 | V | VIN=8V; IOUT=10mA | 5 |
| Load Regulation | ΔVOUT |  | 40 | 60 | mV | VIN=8V; 1mA≤IOUT≤20mA | 5 |
| Current Consumption | ISS |  | 2 | 5 | μA | VIN=8V; No load | 5 |
| Input Voltage | VIN |  |  | 35 | V |  | 5 |
| Supply Voltage |  | -0.3 |  | 35 | V |  | 2 |
| Operating Temperature |  | -40 |  | 85 | ℃ |  | 2 |
| Storage Temperature |  | -50 |  | 125 | ℃ |  | 2 |
| Thermal Resistance, Junction to Ambient (SOT23) | θJA |  |  | 500 | ℃/W | Assume no ambient airflow, no heat sink | 2 |
| Power Dissipation (SOT23) | PD |  |  | 0.2 | W | PD is measured at Ta=25℃ | 2 |

## CAD (KiCad official)

- Symbol: `HE2021A50HMR`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `he2021a50hmr-etched.step` / `he2021a50hmr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `he2021a50hmr.step` / `he2021a50hmr.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/8588916794627133440) (9 pp, sha256 `8d7e2c2e64e2ae10`, 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/he2021a50hmr-datasheet.pdf)