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MD5133

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by Ray

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

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Symbol & Footprint

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Datasheet

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Contents

README

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MD5133

Shanghai Mingda Microelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-3L

MD5133 from Shanghai Mingda Microelectronics, in a SOT-23-3L. 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 supply input. Operating range 1.4V to 7.0V; absolute max -0.3V to 8.0V. A ceramic input capacitor of >=1.0uF should be placed close to this pin.
2 GND power_in Device ground / return for VIN, VOUT and internal reference/feedback network. Connect to the system ground plane with a low-impedance path.
3 CE input Chip enable, active-high (ON/OFF Logic = Enable High). VCEH >= 1.0V (max 6.0V) enables the regulator; VCEL <= 0.38V disables the LDO, forcing shutdown current ~10nA and activating the COUT auto-discharge switch (RDCHG ~450Ω typ). Do not leave floating.
4 NC unconnected No internal connection. May be left floating or tied to GND for mechanical robustness; no electrical function.
5 VOUT power_out Regulated 3.3V output, up to 300mA (typ current limit ~470mA, short-circuit current ~65mA under foldback). Requires >=0.1uF (recommend 1.0uF) low-ESR ceramic output capacitor. VOUT must not exceed VIN+0.3V (parasitic diode risk).

Key specifications

Parameter Value
Manufacturer Shanghai Mingda Microelectronics
Package SOT-23-3L
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • MD5133SOT23-5L
  • MD5133SOT89-3L
  • MD5133SOT23-3L
  • MD5133DFNWB-4L

CAD (KiCad official)

  • Symbol: MD5133
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT-23-3L (KiCad packages3D, STEP)

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