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MD5125

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Shanghai Mingda Microelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, XDFN-4-EP(1x1). Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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PCB Footprint

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Datasheet

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Contents

README

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MD5125

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

MD5125 from Shanghai Mingda Microelectronics, in a XDFN-4-EP(1x1). 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 Unregulated input supply. Operating range 1.4 V to 7.0 V (absolute max -0.3 to 8.0 V). Bypass with a >=1.0 uF ceramic capacitor as close to the pin as possible.
2 GND power_in Device ground / return for the internal reference, error amplifier and pass MOSFET. Quiescent GND current is typically 0.5 uA (no load).
3 CE input Chip-enable / ON-OFF logic input, active high. VCEH >= 1.0 V (max 6.0 V) enables the regulator; VCEL <= 0.38 V disables it and activates the COUT auto-discharge switch. Do not leave floating.
4 NC unconnected No internal connection on the SOT-23-5L variant. May be left floating or tied to GND for mechanical stability.
5 VOUT power_out Regulated 2.5 V output (MD5125), ±2% accuracy, up to 300 mA (current-limit typ 470 mA with foldback to ~65 mA short-circuit). Requires a >=0.1 uF low-ESR ceramic output capacitor (1.0 uF recommended). Do not force VOUT above VIN+0.3 V - the P-channel MOSFET's parasitic diode can be damaged.

Key specifications

Parameter Value
Manufacturer Shanghai Mingda Microelectronics
Package XDFN-4-EP(1x1)
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • MD5125SOT23-5L
  • MD5125SOT23-3L
  • MD5125SOT89-3L
  • MD5125DFNWB-4L

CAD (KiCad official)

  • Symbol: MD5125
  • Footprint: Package_DFN_QFN:OnSemi_XDFN4-1EP_1.0x1.0mm_EP0.52x0.52mm
  • 3D model: XDFN-4-EP(1x1) (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
md5125.step 144 KB You want the bare part, or you mark your own boards.
md5125-etched.step 1.0 MB You want the part with MD5125 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 266 faces against 41 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 b9016866a24d108a, 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