# MD8433

**Shanghai Mingda Microelectronics** · Linear Voltage Regulators (LDO) · TO-252-4L

MD8433 from Shanghai Mingda Microelectronics, in a TO-252-4L. 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 | VOUT | power_out | Regulated output voltage pin (3.3V ±2% for MD8433, up to 300mA output current, 1.0uF minimum output capacitor, must not exceed VIN+0.3V). |
| 2 | EN | input | Enable pin: drive high (1.5V to 40V) to enable the device and low (0V to 0.6V) to put it into low current shutdown. |
| 3 | GND | power_in | Ground pin, which is also the thermal tab electrically connected to the GND node and to be connected to the GND plane for improved thermal performance. |
| 4 | NC | unconnected | No internal connection. |
| 5 | VIN | power_in | Power input pin with an operating input voltage range of 2.2V to 40V (absolute maximum 45V) and a 1.0uF minimum input capacitor. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shanghai Mingda Microelectronics |
| Package | TO-252-4L |
| Category | Power Supply Chip |
| Pins | 5 |

## CAD (KiCad official)

- Symbol: `MD8433`
- Footprint: `Package_TO_SOT_SMD:TO-252-4`
- 3D model: TO-252-4L (KiCad packages3D, STEP)
- 3D model files: `md8433-etched.step` / `md8433-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `md8433.step` / `md8433.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shanghai Mingda Microelectronics datasheet](docs/md8433-datasheet.pdf) (15 pp, sha256 `627a9d1fa1c18cbe`, retrieved 2026-10-27, 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/md8433-datasheet.pdf)