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MD5128

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

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MD5128

Shanghai Mingda Microelectronics · Linear Voltage Regulators (LDO) · SOT-89-3

MD5128 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 pin, also the return for the internal COUT auto-discharge switch connected between VOUT and GND.
2 VIN power_in Input supply pin, operating range 1.5V to 7V (absolute maximum -0.3V to 8.0V), with a recommended input capacitor of 1.0uF or more.
3 VOUT power_out Regulated 2.8V output (MD5128) delivering up to 300mA, limited to -0.3V to VIN+0.3V, with a recommended output capacitor of 0.1uF or more.

Key specifications

Parameter Value
Manufacturer Shanghai Mingda Microelectronics
Package SOT-89-3
Category Power Management ICs
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
Input Voltage (absolute maximum) VIN -0.3 8 V 2
Output Voltage (absolute maximum, lower bound) VOUT -0.3 V 2
Power Dissipation, SOT89-3L PD 500 mW 2
Operating Ambient Temperature Topr -40 85 ℃ 2
Storage Temperature Tstg -40 125 ℃ 2
ESD Protection ESD HBM 6000 V HBM 2
Output Voltage Accuracy (VOUT(S)≥2.0V) VOUT(S) -2 2 ％ VIN=VOUT(S)+1.0V, IOUT=10mA, VOUT(S)≥2.0V 2
Dropout Voltage (VOUT<3V) VDROP 70 mV VCE=VIN, VOUT<3V, IOUT=100mA 2
Line Regulation 0.05 0.1 ％/V VOUT(S)+0.5V≤VIN=VCE≤7V, IOUT=10mA 2
Load Regulation 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
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
Input Voltage VIN 1.5 7 V 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
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
Output Voltage (nominal, MD5128) VOUT 2.8 V 1
Short Circuit Current ISHORT 65 mA VIN=VCE=VOUT(S)+1.0V, VOUT=0V 2
Power Supply Rejection Ratio (10Hz) PSRR 60 dB f=10Hz, VOUT(S)=2.5V 2
Power Supply Rejection Ratio (100Hz) PSRR 45 dB f=100Hz, VOUT(S)=2.5V 2
Power Supply Rejection Ratio (1kHz) PSRR 25 dB f=1kHz, VOUT(S)=2.5V 2

CAD (KiCad official)

  • Symbol: MD5128
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3 (KiCad packages3D, STEP)
  • 3D model files: md5128-etched.step / md5128-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); md5128.step / md5128.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 2026-10-30, 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