# MD52A40PA1

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

MD52A40PA1 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 internal COUT auto-discharge switch is connected between the VOUT and GND pins. |
| 2 | VIN | power_in | Input supply pin with an operating range of 2.2V to 7.0V and an absolute maximum rating of -0.3V to 8V; a 1.0µF input capacitor is specified. |
| 3 | VOUT | power_out | Regulated output pin, which must not be driven above VIN+0.3V; a 1.0µF output capacitor is specified. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shanghai Mingda Microelectronics |
| Package | SOT-89-3L |
| 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 | 2.2 |  | 7 | V |  | 4 |
| Output Voltage tolerance (VOUT(S)=4.0V for MD52A40PA1) | VOUT(S) | -2 |  | 2 | % | VIN=VOUT(S)+1.0V, IOUT=10mA, VOUT(S)≥2.0V | 4 |
| Line Regulation | ΔVOUT/ΔVIN |  | 0.05 | 0.1 | %/V | VOUT(S)+0.5V≤VIN=VEN≤7V, IOUT=10mA | 4 |
| Load Regulation | VOUT2 |  | 50 | 90 | mV | VIN=VEN=VOUT(S)+1.0V, 1mA≤IOUT≤500mA | 4 |
| Temperature Stability |  | -50 |  | 50 | ppm/℃ | VIN=VEN=VOUT(S)+1.0V, IOUT=1mA, -40℃≤Ta≤125℃ | 4 |
| GND Current | IGND |  | 0.6 | 0.9 | μA | VEN=VIN, no load | 4 |
| Shutdown Current | ISHUT |  | 0.01 | 0.1 | μA | VIN=7.0V, VEN=0 | 4 |
| Maximum Output Current | IOUTMAX | 450 |  | 500 | mA |  | 4 |
| COUT Auto Discharge | RDCHG | 280 | 450 | 640 | Ω | VEN=0, VOUT=VOUT(S) | 4 |
| EN 'H' Level Voltage | VENH | 1 |  | 7 | V |  | 4 |
| EN 'L' Level Voltage | VENL | 0 |  | 0.38 | V |  | 4 |
| EN 'H' Level Current | IENH | -0.1 |  | 0.1 | μA | VIN=7.0V, VEN=VIN | 4 |
| EN 'L' Level Current | IENL | -0.1 |  | 0.1 | μA | VIN=7.0V, VEN=0 | 4 |
| Input Voltage (absolute maximum) | VIN | -0.3 |  | 8 | V |  | 3 |
| Power Dissipation | PD |  |  | 1000 | mW | SOT89-3 package | 3 |
| Operating Ambient Temperature | Topr | -40 |  | 85 | ℃ |  | 3 |
| Storage Temperature | Tstg | -40 |  | 125 | ℃ |  | 3 |
| ESD Protection HBM | ESD HBM | 6000 |  |  | V | HBM | 3 |
| Thermal Resistance junction-to-board (SOT89-3) | RθJB |  | 100 |  | ℃/W | Mounted on JEDEC standard 4-layer (2s2p) PCB | 3 |

## CAD (KiCad official)

- Symbol: `MD52A40PA1`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3L (KiCad packages3D, STEP)
- 3D model files: `md52a40pa1-etched.step` / `md52a40pa1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `md52a40pa1.step` / `md52a40pa1.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shanghai Mingda Microelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588917340158742528) (14 pp, sha256 `4168b8cf3e52f15f`, 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/md52a40pa1-datasheet.pdf)