# MD8240A

**Shanghai Mingda Microelectronics** · Linear Voltage Regulators (LDO) · SOT-89-3

MD8240A from Shanghai Mingda Microelectronics, 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 reference for the regulator, which must be wired with low impedance, and the output capacitor should be placed close to the VOUT-GND pins. |
| 2 | VIN | power_in | Regulator input supply with an absolute maximum of -0.3 to 45 V and 40 V maximum input for regulated output, requiring an input capacitor of 1.0 uF or more. |
| 3 | VOUT | power_out | Regulated 4.0 V output (MD8240, 3.88 to 4.12 V) with 150 mA rated load and about 300 mA typical current limit, which must not exceed VIN+0.3 V and needs an output capacitor of 2.2 uF or more. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shanghai Mingda Microelectronics |
| Package | SOT-89-3 |
| Category | Power Management ICs |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `MD8240A`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3 (KiCad packages3D, STEP)
- 3D model files: `md8240a-etched.step` / `md8240a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `md8240a.step` / `md8240a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shanghai Mingda Microelectronics datasheet](docs/md8240a-datasheet.pdf) (10 pp, sha256 `bd4aefd613b0a967`, retrieved 2026-10-27, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/md8240a-datasheet.pdf)