# HE2280A50MR

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

HE2280A50MR from HEERMICR, in a SOT-23-3. 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, the common reference (VSS) for the regulator; the datasheet calls for a wide copper trace on GND. |
| 2 | VOUT | power_out | Regulated 5.0V output (HE2280A50MR), up to 150mA, absolute maximum VSS+6.0V, and it needs a 10uF X7R/X5R ceramic output capacitor to GND for stability. |
| 3 | VIN | power_in | Supply input, absolute maximum VSS+80V with recommended maximum of 60V, decoupled with a 10uF ceramic capacitor to GND placed close to the device. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HEERMICR |
| Package | SOT-23-3 |
| 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 |
|---|---|---|---|---|---|---|---|
| Input Voltage | VIN |  |  | 80 | V |  | 4 |
| Output voltage tolerance (HE2280(A) grade, 5.0V) | VOUT | -1 |  | 1 | % | HE2280(A) ±1% output voltage | 1 |
| Supply Current | IQ |  | 2 | 3 | uA | VIN=12V, ILOAD=0mA | 4 |
| Maximum Output Current | IOUT(Max) |  |  | 200 | mA |  | 4 |
| Supply voltage at VIN |  |  |  | 60 | 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, relative to VSS) | VIN | -0.3 |  | 80 | V | Relative to VSS | 3 |
| Output Voltage (absolute maximum, relative to VSS) | VOUT | -0.3 |  | 6 | V | Relative to VSS | 3 |
| Output Current | IOUT |  |  | 400 | mA |  | 3 |
| Power Dissipation SOT23-3 | Pd |  |  | 400 | mW |  | 3 |
| Thermal Resistance SOT23-3 | RθJA |  | 250 |  | ℃/W | Package thermal impedance per JESD 51-7 (note 3) | 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 | ILATCH-UP | -150 |  | 150 | mA | JEDEC JESD78E, Temperature Class I | 3 |
| Line Regulation | ΔVOUT/ΔVIN•VOUT |  | 0.01 |  | %/V | IOUT=1mA, (Vset+0.5v)≦VIN≦55V | 4 |
| Load Regulation | ΔVOUT |  | 0.02 |  | %/ mA | VIN=12V, 1mA≦IOUT≦100mA | 4 |
| Short Current | ISHORT |  | 80 |  | mA | RL=1Ω | 4 |
| Output Noise Voltage | eNO |  | 50 |  | uVRMS | COUT=1uF, BW = 300Hz~50kHz | 4 |
| Output Voltage Temperature Coefficient | ΔVOUT/ΔT•VOUT |  | 100 |  | ppm/℃ | IOUT=10mA | 4 |

## CAD (KiCad official)

- Symbol: `HE2280A50MR`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `he2280a50mr-etched.step` / `he2280a50mr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `he2280a50mr.step` / `he2280a50mr.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/8590237984529686528) (9 pp, sha256 `00ab58f3bb61acb0`, retrieved 2026-10-18, 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/he2280a50mr-datasheet.pdf)