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MD53U18

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

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MD53U18

Shanghai Mingda Microelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3

MD53U18 from Shanghai Mingda Microelectronics, in a SOT-89-3. 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 (VSS) reference pin; connect the output capacitor close to the VOUT-VSS pins with low-impedance wiring.
2 VDD power_in Positive input supply (VIN), operating up to 10V with an absolute maximum of 12V; VOUT must not exceed VIN+0.3V.
3 VOUT power_out Regulated 1.8V output (±2%) for MD53U18, needs a 2.2uF or larger capacitor with ESR of about 0.5-5 ohm, with short-circuit current limited to about 50mA.

Key specifications

Parameter Value
Manufacturer Shanghai Mingda Microelectronics
Package SOT-89-3
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 1.764 1.8 1.836 V VIN= 2.8V，IOUT=40mA 2
Output current IOUT 350 mA VIN=2.8V 2
Input-output voltage difference Vdrop 15 21 mV IOUT=10 mA 2
Input-output voltage difference Vdrop 140 210 mV IOUT=100 mA 2
Input stability ΔVOUT1/(ΔVIN·VOUT) 0.05 0.2 ％/V 2.8V≤VIN≤10V, IOUT=1mA 2
Load stability ΔVOUT2 25 40 mV VIN=2.8V, 1.0mA≤IOUT≤150mA 2
Ripple rejection (PSRR) PSRR 65 dB VIN=VOUT(S)+1V+1Vp_p, f=1KC, Iout=50mA 2
Output voltage temperature coefficient ΔVOUT/(ΔTa·VOUT) -100 50 100 Ppm/℃ VIN=2.8V, IOUT=10mA, -40℃≤Ta≤85℃ 2
Current consumption ISS 25 40 uA VIN=VOUT(S)+2V, no load 2
Input voltage VIN 10 V 2
Output short-circuit current Ilim 50 70 mA Vout=0V 2
Input voltage (absolute maximum) VIN 12 V 2
Allowable power dissipation (SOT-89) 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: MD53U18
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3 (KiCad packages3D, STEP)
  • 3D model files: md53u18-etched.step / md53u18-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); md53u18.step / md53u18.glb are the bare package body.

Provenance

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

  • Datasheet: Shanghai Mingda Microelectronics datasheet (11 pp, sha256 5a4556463821b84c, retrieved 2026-10-20, 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