MD52E33QC3 from Shanghai Mingda Microelectronics, in a SOT-23-5L. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	VIN	power_in	Input supply pin. Operating range 2.2V to 7.0V (absolute max -0.3V to +8V). Decouple with a low-ESR ceramic capacitor of 1.0µF or greater placed close to the pin.
2	GND	power_in	Ground reference for the regulator and reference voltage. Also the return path used by the internal output auto-discharge switch when EN is low.
3	EN	input	Enable input, active high. VENH ≥ 1.0V turns the regulator on (max 7.0V); VENL ≤ 0.38V forces shutdown (ISHUT ≈ 10nA) and activates the COUT auto-discharge switch via RDCHG (~450Ω typ). Input leakage ±0.1µA. Do not leave floating.
4	NC	unconnected	No internal connection. Leave floating or tie to GND for best mechanical rigidity.
5	VOUT	power_out	Regulated 3.3V output (±2% initial accuracy). Delivers up to 500mA with a typical dropout of 230mV. Requires a 1.0µF (or larger) low-ESR ceramic output capacitor. Must not exceed VIN+0.3V to avoid reverse current through the P-MOSFET body diode.

Key specifications

Parameter	Value
Manufacturer	Shanghai Mingda Microelectronics
Package	SOT-23-5L
Category	PMIC
Pins	5

Ordering variants

Same part, different packaging or reel option.

MD52E33QC3
MD52E33QA3
MD52A33PA1
MD52E33WB6

CAD (KiCad official)

Symbol: MD52E33QC3
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5L (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`md52e33qc3.step`	85 KB	You want the bare part, or you mark your own boards.
`md52e33qc3-etched.step`	2.2 MB	You want the part with `MD52E33QC3` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 526 faces against 102 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: Shanghai Mingda Microelectronics datasheet (14 pp, sha256 4168b8cf3e52f15f, retrieved 2026-08-17, tier: lcsc)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF