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MD85A33QC3

Public Made by Adom

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Shanghai Mingda Microelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-5L. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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Contents

README

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MD85A33QC3

Shanghai Mingda Microelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-5L

MD85A33QC3 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 GND power_in Ground reference for the regulator. Connect to the system ground plane.
2 VIN power_in Power input pin. Absolute max -0.3V to +45V; recommended operating range 2.2V to 40V. Bypass to GND with a 2.2uF (or larger) low-ESR ceramic capacitor placed close to the pin.
3 VOUT power_out Regulated 3.3V output (±2%). Delivers up to 300mA (350mA typ max); current limit ~550mA typical with foldback to ~65mA on short. Requires a 2.2uF (or larger) low-ESR ceramic output capacitor. VOUT must not exceed VIN+0.3V (parasitic body-diode conduction).
4 NC unconnected No internal connection. Leave floating or tie to GND.
5 NC unconnected No internal connection. Leave floating or tie to GND. Note: the A_Type variant does NOT expose the EN pin that appears on the standard (non-A) SOT23-5 pinout; the device is always enabled.

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.

  • MD85A30QC3
  • MD85A33QC3
  • MD85A36QC3
  • MD85A50QC3
  • MD85E30QC3
  • MD85E33QC3
  • MD85E36QC3
  • MD85E50QC3
  • MD85E30QA3
  • MD85E33QA3
  • MD85E36QA3
  • MD85E50QA3
  • MD85E30PA1
  • MD85E33PA1
  • MD85E36PA1
  • MD85E50PA1
  • MD85E53PA1
  • MD85E57PA1
  • MD85EC0PA1
  • MD85EF0PA1
  • MD85A30PA1
  • MD85A33PA1
  • MD85A36PA1
  • MD85A50PA1
  • MD85AC0PA1
  • MD85E33SF4
  • MD85E50SF4
  • MD85EC0SF4
  • MD85EF0SF4

CAD (KiCad official)

  • Symbol: MD85A33QC3
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5L (KiCad packages3D, STEP)
  • 3D model files: md85a33qc3-etched.step / md85a33qc3-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); md85a33qc3.step / md85a33qc3.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
md85a33qc3.step 85 KB You want the bare part, or you mark your own boards.
md85a33qc3-etched.step 2.3 MB You want the part with MD85A33QC3 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 549 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 (13 pp, sha256 b57d90f008c009b2, 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