# MD85A40PA1

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

MD85A40PA1 from Shanghai Mingda Microelectronics, in a SOT-89-3L. 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 pin; the datasheet lists it as ground with no separate electrical limit. |
| 2 | VIN | power_in | Power input pin; input voltage range is 2.2V to 40V, with an absolute maximum rating of -0.3V to 45V. |
| 3 | VOUT | power_out | Regulated output voltage pin; the VOUT pin potential must not exceed VIN+0.3V to avoid reverse current damage. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `MD85A40PA1`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3L (KiCad packages3D, STEP)
- 3D model files: `md85a40pa1-etched.step` / `md85a40pa1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `md85a40pa1.step` / `md85a40pa1.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shanghai Mingda Microelectronics datasheet](docs/md85a40pa1-datasheet.pdf) (15 pp, sha256 `2669d0b7ea07427b`, retrieved 2026-11-05, 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/md85a40pa1-datasheet.pdf)