# MD5127

**Shanghai Mingda Microelectronics** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · UDFN-4-EP(1x1)

MD5127 from Shanghai Mingda Microelectronics, in a UDFN-4-EP(1x1). 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 pin driven by the P-channel pass transistor, with a 0.1µF or larger output capacitor, a maximum of 300mA output current, and a voltage that must not exceed VIN+0.3V. |
| 2 | GND | power_in | Ground pin, which also returns the internal COUT auto-discharge switch from VOUT when CE is low. |
| 3 | CE | input | Active-high chip enable and ON/OFF input, where VCEH is 1.0V to 6.0V for on and VCEL is 0V to 0.38V for off with output discharge. |
| 4 | VIN | power_in | Power supply input of 1.5V to 7V (absolute maximum 8.0V), with a 1.0µF or larger input capacitor placed close to the IC. |
| 5 | EP | passive | Exposed thermal pad shown on the package drawing; the datasheet does not state its electrical connection. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shanghai Mingda Microelectronics |
| Package | UDFN-4-EP(1x1) |
| Category | Power Management (PMIC) |
| Pins | 5 |

## CAD (KiCad official)

- Symbol: `MD5127`
- Footprint: `Package_DFN_QFN:UDFN-4-1EP_1x1mm_P0.65mm_EP0.48x0.48mm`
- 3D model: UDFN-4-EP(1x1) (KiCad packages3D, STEP)
- 3D model files: `md5127-etched.step` / `md5127-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `md5127.step` / `md5127.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/8588917733794983936) (14 pp, sha256 `b9016866a24d108a`, retrieved 2026-10-20, 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/md5127-datasheet.pdf)