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MD53U33

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Shanghai Mingda Microelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-89. Pinout reviewed by a person against the datasheet, KiCad symbol/footprint/3D.

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MD53U33

Shanghai Mingda Microelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89

MD53U33 from Shanghai Mingda Microelectronics, in a SOT-89. 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 GND power_in Ground pin (VSS); connect to the single-point ground, with the 10uF input and output capacitors returned to it.
2 VIN power_in Input supply pin; operating input up to 10V (absolute maximum 12V), with a 10uF capacitor to ground in the application circuit.
3 VOUT power_out Regulated 3.3V output (±2%) delivering 500mA typical; requires a 2.2uF or larger output capacitor with ESR of about 0.5 to 5 ohm, and output short-circuit current is about 50mA.

Key specifications

Parameter Value
Manufacturer Shanghai Mingda Microelectronics
Package SOT-89
Category Power Management (PMIC)
Pins 3

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Output voltage VOUT 3.234 3.3 3.366 V Ta=25℃; VIN=4.3V, IOUT=50mA 4
Output current IOUT 500 mA Ta=25℃; VIN=4.3V 4
Input-output voltage difference (dropout) Vdrop 10 14 mV Ta=25℃; IOUT=10 mA 4
Input-output voltage difference (dropout) Vdrop 200 280 mV Ta=25℃; IOUT=200 mA 4
Input stability ΔVOUT1/(ΔVIN·VOUT) 0.05 0.2 ％/V Ta=25℃; 4.3V≤VIN≤10V, IOUT=1mA 4
Load stability ΔVOUT2 25 40 mV Ta=25℃; VIN=4.3V, 1.0mA≤IOUT≤200mA 4
Ripple rejection PSRR 65 dB Ta=25℃; VIN=VOUT(S)+1V+1Vp_p, f = 1KC, Iout=50mA 4
Output voltage temperature coefficient ΔVOUT/(ΔTa·VOUT) 50 100 Ppm/℃ VIN=4.3V, IOUT=10mA, -40℃≤Ta≤85℃; printed ±50 (typ) and ±100 (max) 4
Current consumption (no load) ISS 25 40 uA Ta=25℃; VIN=VOUT(S)+2V, no load 4
Input voltage VIN 10 V 4
Output short-circuit current Ilim 50 70 mA Ta=25℃; Vout=0V 4
Input voltage (absolute maximum) VIN 12 V Ta=25℃ (table general condition) 2
Permissible power dissipation PD 500 Mw SOT_89 package 2
Operating ambient temperature range Topr -40 85 ℃ 2
Storage ambient temperature range Tstg -40 125 ℃ 2

CAD (KiCad official)

  • Symbol: MD53U33
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89 (KiCad packages3D, STEP)
  • 3D model files: md53u33-etched.step / md53u33-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); md53u33.step / md53u33.glb are the bare package body.

Provenance

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

  • Datasheet: Shanghai Mingda Microelectronics datasheet (10 pp, sha256 5b82675f2bb345a1, retrieved 2026-10-21, 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: 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