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MD53R18

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Shanghai Mingda Microelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-5L. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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MD53R18

Shanghai Mingda Microelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-5L

MD53R18 from Shanghai Mingda Microelectronics, in a SOT-23-5L. 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 VIN power_in Input supply pin; operating input up to 10V (absolute maximum 12V), with at least 1.0 µF input capacitor recommended.
2 GND power_in Ground pin (VSS) of the regulator.
3 EN input ON/OFF enable input, high level 1.0V to 10V turns the output on and low level 0V to 0.35V shuts down; has no internal pull-up/down so do not leave floating, tie to VIN if unused.
4 NC unconnected No internal connection.
5 VOUT power_out Regulated 1.8V output (±2%) for MD53R18, up to 500mA typical, needing at least 2.2 µF output capacitor with ESR 0.5 to 5 ohm, and must not exceed VIN+0.3V.

Key specifications

Parameter Value
Manufacturer Shanghai Mingda Microelectronics
Package SOT-23-5L
Category Power Management (PMIC)
Pins 5

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 accuracy VOUT -2 2 % VIN= VOUT+1V, IOUT=40mA 3
Dropout voltage VDROP 600 1100 mV IOUT=500mA, VOUT=1.8V 3
Input stability ΔVOUT1/ΔVIN*VOUT 0.05 0.2 %/V VOUT+1V≤VIN≤10V, IOUT=1mA 3
Load regulation ΔVOUT2 15 30 mV VIN=VOUT+1V, 1mA≤IOUT≤100mA 3
Output voltage temperature coefficient ΔVOUT/ΔTa*VOUT -100 50 100 ppm/℃ VIN=VOUT+1V, IOUT=1mA, -40℃≤Ta≤125℃ 3
Quiescent current (GND current, no load) ISS 25 40 μA VIN=VEN=VOUT+1V, no load 3
Shutdown current, no load ISHUT 0.1 1 μA VIN=VOUT+1V, VEN=0, no load 3
EN pull-up current IENH 0.1 1 μA VIN=VEN=VOUT+1V 3
EN input high voltage VENH 1 10 V 3
EN input low voltage VENL 0 0.35 V 3
Input voltage VIN 10 V 3
Output short-circuit current ISHORT 50 70 mA VOUT=0V 3
Power supply rejection ratio PSRR 65 dB f=100Hz, IOUT=10mA 3
Input voltage (absolute maximum) VIN 12 V 2
Power dissipation, SOT23-5 PD 250 mW Ta=25℃, SOT23-5 2
Ambient operating temperature range TOPR -40 85 ℃ 2
Storage ambient temperature range TSTG -40 125 ℃ 2
Thermal resistance junction-to-board, SOT23-5 RθJB 200 ℃/W SOT23-5, mounted on JEDEC 4-layer (2s2p) PCB test board 2
Output voltage (nominal) VOUT 1.8 V 2
Output current IOUT 500 mA VIN= VOUT+1V 3
Input capacitor CIN CIN 1 µF Input capacitor, minimum value 8
Output capacitor CL (tantalum) CL 2.2 µF Output capacitor, tantalum type 8
Output capacitor CL (aluminum electrolytic) CL 10 µF Output capacitor, aluminum electrolytic type 8
Output capacitor ESR range ESR 0.5 5 Ω Output capacitor ESR, for stable operation 10

CAD (KiCad official)

  • Symbol: MD53R18
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5L (KiCad packages3D, STEP)
  • 3D model files: md53r18-etched.step / md53r18-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); md53r18.step / md53r18.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 2026-10-18, 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-haiku-5-5 (text), consensus claude-sonnet-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