# HE2031A50MPR

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

HE2031A50MPR from HEERMICR, in a SOT-89. 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, referenced as the GND pin in the SOT89 pin table. |
| 2 | VIN | power_in | Input voltage pin; the datasheet gives a supply voltage absolute maximum of 25V (absolute maximum range 1.5V to 25V) and specifies Vin = Vout + 1V for the electrical characteristics. |
| 3 | VOUT | power_out | Regulated output voltage pin, which for the HE2031A50 (5.0V) delivers output current specified at 400mA typical with Vin-Vout=1V and output accuracy of ±1%. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HEERMICR |
| Package | SOT-89 |
| 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 accuracy (tolerance) | VOUT | -1 |  | 1 | % | Output voltage accuracy, printed as ±1% in Features | 1 |
| Line Regulation |  |  | 0.05 | 0.2 | %/V | 1.6V≤Vin≤8V, Iout=100mA | 4 |
| Load Regulation | ΔVout |  | 12 | 30 | mV | Vin=Vout+1V, 1.0mA≤Iout≤100mA | 4 |
| Output voltage Temperature Coefficient |  | -100 |  | 100 | Ppm/℃ | Iout=30mA, 0℃≤Ta≤70℃; printed ±100 | 4 |
| Supply Current | Iss1 |  | 1 | 2 | uA |  | 4 |
| Input Voltage | Vin |  |  | 25 | V |  | 4 |
| Dropout Voltage, 4.0<Vout≤5.0 at 100 mA | Vdif |  | 0.17 | 0.18 | V | 4.0 < Vout ≤ 5.0, Iout=100 mA | 4 |
| Dropout Voltage, 4.0<Vout≤6.0 at 200 mA | Vdif |  | 0.2 | 0.22 | V | 4.0 < Vout ≤ 6.0, Iout=200 mA | 4 |
| Dropout Voltage, 4.0<Vout≤6.0 at 400 mA | Vdif |  | 0.75 | 0.8 | V | 4.0 < Vout ≤ 6.0, Iout=400 mA | 4 |
| Operating Temperature |  | -40 |  | 85 | ℃ |  | 4 |
| Storage Temperature |  | -40 |  | 125 | ℃ |  | 4 |
| Input resistor Re (ceramic input/output capacitors) | Re | 1.2 |  | 1.8 | Ω | Note2: ceramic Cin/Cout, Re=(1.2~1.8)Ω | 5 |
| Output Current | Iout |  | 400 |  | mA | Vin-Vout=1V | 4 |
| Power Supply Rejection Ratio | PSRR |  | 60 |  | dB | F=1KHz, Vin=Vout+1V | 4 |
| Input capacitor Cin (recommended) | Cin |  | 10 |  | uF | Note1; electrolytic recommended | 5 |
| Output capacitor Cout (recommended) | Cout |  | 10 |  | uF | Note1; electrolytic recommended | 5 |

## CAD (KiCad official)

- Symbol: `HE2031A50MPR`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `he2031a50mpr-etched.step` / `he2031a50mpr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `he2031a50mpr.step` / `he2031a50mpr.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/8588917078329856000) (7 pp, sha256 `da0d9ffdd9bd5fee`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/he2031a50mpr-datasheet.pdf)