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MD53R55

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Shanghai Mingda Microelectronics Linear Voltage Regulators (LDO), SOT-89-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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MD53R55

Shanghai Mingda Microelectronics · Linear Voltage Regulators (LDO) · SOT-89-5

MD53R55 from Shanghai Mingda Microelectronics, in a SOT-89-5. 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 NC unconnected No internal connection on the SOT89-5 package.
2 GND power_in Ground pin (VSS); the SOT89-5 drawing also ties the center tab (labelled 2) to this pin.
3 EN input ON/OFF control input with VENH 1.0V to 10V for on and VENL 0V to 0.35V for off; has no internal pull-up/pull-down so must not be left floating, and tie to VIN if unused.
4 VIN power_in Input supply pin with operating input up to 10V (absolute maximum 12V); needs a CIN of 1.0uF or more.
5 VOUT power_out Regulated 5.5V output (±2%) for MD53R55, up to 500mA typical, with 50mA short-circuit current limit; needs COUT of 2.2uF or more with ESR of 0.5 to 5 ohm.

Key specifications

Parameter Value
Manufacturer Shanghai Mingda Microelectronics
Package SOT-89-5
Category Power Supply Chip
Pins 5

CAD (KiCad official)

  • Symbol: MD53R55
  • Footprint: Package_TO_SOT_SMD:SOT-89-5
  • 3D model: SOT-89-5 (KiCad packages3D, STEP)
  • 3D model files: md53r55-etched.step / md53r55-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); md53r55.step / md53r55.glb are the bare package body.

Provenance

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

  • Datasheet: Shanghai Mingda Microelectronics datasheet (13 pp, sha256 264969efedda2a5d, retrieved 2026-10-23, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • 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