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MD5121

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

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MD5121

Shanghai Mingda Microelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-3L

MD5121 from Shanghai Mingda Microelectronics, in a SOT-23-3L. 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; also the return for the internal COUT auto-discharge switch (RDCHG 280-640 ohm) connected to VOUT.
2 VOUT power_out Regulated 2.1V output (±2%) delivering up to 300mA (250mA min); VOUT must not exceed VIN+0.3V, and COUT of 0.1uF or more is recommended.
3 VIN power_in Supply input, 1.5V to 7V operating range (absolute maximum -0.3 to 8.0V); CIN of 1.0uF or more is recommended, placed close to the IC.

Key specifications

Parameter Value
Manufacturer Shanghai Mingda Microelectronics
Package SOT-23-3L
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 accuracy (product selection, MD5121 2.1V) VOUT(S) -2 2 % VIN=VOUT(S)+1.0V, IOUT=10mA, VOUT(S)≥2.0V 2
Input Voltage VIN 1.5 7 V 2
Line Regulation 0.05 0.1 ％/V VOUT(S)+0.5V≤VIN=VCE≤7V, IOUT=10mA 2
Load Regulation VOUT 6 20 mV VIN=VCE=VOUT(S)+1.0V, 1mA≤IOUT≤100mA 2
Temperature Stability -50 50 ppm/℃ VIN=VCE=VOUT(S)+1.0V, IOUT=1mA, -40℃≤Ta≤85℃ 2
Dropout Voltage (VOUT＜3V) VDROP 70 mV VCE=VIN, VOUT＜3V, IOUT=100mA 2
GND Current (no load) IGND 0.5 0.9 uA CE=VIN, no load 2
GND Current (IOUT=100mA) IGND 40 uA CE=VIN, IOUT=100mA 2
Shutdown Current ISHUT 0.01 0.1 uA VIN=7.0V, VCE=0 2
Maximum Output Current IOUTMAX 250 300 mA 2
Current Limit ILIM 300 470 mA VIN=VCE=VOUT(S)+1.0V, VOUT = 0.95 ×VOUT(S) 2
Short Circuit Current ISHORT 65 mA VIN=VCE=VOUT(S)+1.0V, VOUT=0V 2
COUT Auto Discharge Resistance RDCHG 280 450 640 Ω VCE=0, VOUT=VOUT(S) 2
CE 'H' Level Voltage VCEH 1 6 V 2
CE 'L' Level Voltage VCEL 0 0.38 V 3
CE 'H' Level Current ICEH -0.1 0.1 uA VIN=6.0V, VCE=VIN 3
CE 'L' Level Current ICEL -0.1 0.1 uA VIN=6.0V, VCE=0 3
Input Voltage (absolute maximum) VIN -0.3 8 V 2
Output Voltage (absolute maximum; upper limit printed as VIN+0.3V) VOUT -0.3 V 2
Power Dissipation (SOT23-3L) PD 250 mW SOT23-3L package 2
Operating Ambient Temperature Topr -40 85 ℃ 2
Storage Temperature Tstg -40 125 ℃ 2
ESD Protection (HBM) ESD HBM 6000 V 2
Output Voltage (nominal, MD5121 product selection) VOUT(S) 2.1 V 1

CAD (KiCad official)

  • Symbol: MD5121
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT-23-3L (KiCad packages3D, STEP)
  • 3D model files: md5121-etched.step / md5121-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); md5121.step / md5121.glb are the bare package body.

Provenance

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

  • Datasheet: Shanghai Mingda Microelectronics datasheet (14 pp, sha256 b9016866a24d108a, retrieved 2026-10-18, tier: lcsc)
  • 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