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MD57E18QC3

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

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MD57E18QC3

Shanghai Mingda Microelectronics · Linear Voltage Regulators (LDO) · SOT-23-5L

MD57E18QC3 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; the datasheet specifies an input voltage range of 2.2 V to 5.5 V and recommends a 1.0 µF input capacitor.
2 GND power_in Ground reference pin for the regulator; the datasheet gives no separate limit for this pin.
3 EN input Enable pin with VENH minimum 0.85 V and VENL maximum 0.35 V, rated up to 5.5 V; it is internally pulled to GND through 1 MΩ.
4 NC unconnected No connection; the datasheet does not state a function for this pin.
5 VOUT power_out Regulated output pin for the 1.8 V option; the datasheet requires at least a 1 µF ceramic output capacitor and gives output voltage range 1.2 V to 4.5 V across the series.

Key specifications

Parameter Value
Manufacturer Shanghai Mingda Microelectronics
Package SOT-23-5L
Category Power Management ICs
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
Input Voltage VIN 2.2 5.5 V 4
Input Voltage Absolute Maximum VIN -0.3 6 V 3
Line Regulation ΔVOUT/ΔVIN 0.02 0.1 ％/V VOUT(S)+1.0V≤VIN=VEN≤5.5V IOUT=10mA 4
Line Transient (VIN rising) VOUT_Line -1 mV VIN= VOUT+1V to VOUT+2V in 30us 4
Line Transient (VIN falling) VOUT_Line 1 mV VIN= VOUT+2V to VOUT+1V in 30us 4
Load Regulation VOUT2 10 20 mV VIN=VEN=VOUT(S)+1.0V 1mA≤IOUT≤300mA 4
Load Transient (rising load) VOUT_Load -40 mV IOUT=1mA to 300mA in 10µs 4
Load Transient (falling load) VOUT_Load 40 mV IOUT=300mA to 1mA in 10µs 4
Temperature Stability ΔVOUT/ΔT -100 100 ppm/℃ VIN=VEN=VOUT(S)+1.0V IOUT=1mA, -40℃≤Ta≤125℃ 4
GND Current (no load) IGND 20 30 µA VEN=VIN, no load 4
GND Current (300mA) IGND 470 µA VEN=VIN, IOUT=300mA 4
Shutdown Current ISHUT 0.01 0.1 µA VIN=5.5V, VEN=0 4
Maximum Output Current IOUTMAX 250 300 mA 4
Current Limit ILIM 500 mA VIN=VEN=VOUT(S)+1.0V, VOUT = 0.95 ×VOUT(S) 4
COUT Auto Discharge RDCHG 240 Ω VEN=0, VOUT=VOUT(S) 4
Power Supply Rejection Ratio at 1kHz PSRR 94 dB f=1kHz, IOUT=20mA 4
Power Supply Rejection Ratio at 10kHz PSRR 72 dB f=10kHz, IOUT=20mA 4
Power Supply Rejection Ratio at 100kHz PSRR 77 dB f=100kHz, IOUT=20mA 4
Power Supply Rejection Ratio at 1MHz PSRR 53 dB f=1MHz, IOUT=20mA 4
Output Noise Voltage eN 20 µVRMS IOUT=20mA 4
Start-Up Time TSTART 80 150 µs From VEN>VENH to VOUT=95% of VOUT 4
Overshoot on Start-Up VOUT_Start-up 5 % Stated as a percentage of VOUT(S) 4
EN High Level Voltage VENH 0.85 5.5 V 4
EN Low Level Voltage VENL 0 0.35 V 4
EN High Level Current IENH -0.1 0.1 µA VIN=5.5V, VEN =VIN 4
EN Low Level Current IENL -0.1 0.1 µA VIN=5.5V, VEN =0 4
Over Temperature Protection OTP 155 ℃ IOUT=1mA 4
Output Voltage Absolute Maximum VOUT -0.3 V VIN+0.3V 3
Power Dissipation SOT23-5L PD 250 mW SOT23-5L 3
Thermal Resistance Junction-to-Board SOT23-5L RθJB 180 ℃/W SOT23-5L, mounted on JEDEC standard 4layer (2s2p) PCB 3
Operating Ambient Temperature Topr -40 85 ℃ 3
Storage Temperature Tstg -40 125 ℃ 3
ESD Protection HBM ESD HBM 6000 V 3

CAD (KiCad official)

  • Symbol: MD57E18QC3
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5L (KiCad packages3D, STEP)
  • 3D model files: md57e18qc3-etched.step / md57e18qc3-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); md57e18qc3.step / md57e18qc3.glb are the bare package body.

Provenance

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

  • Datasheet: Shanghai Mingda Microelectronics datasheet (12 pp, sha256 42680ba6ee0683b4, retrieved 2026-10-27, tier: lcsc)
  • 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