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MD85A28PA1

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

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MD85A28PA1

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

MD85A28PA1 from Shanghai Mingda Microelectronics, in a SOT-89-3L. 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 reference pin for the regulator; the datasheet gives no separate electrical limit for this pin.
2 VIN power_in Power input pin; the input voltage range is 2.2V to 40V in operation, with an absolute maximum rating of -0.3V to 45V.
3 VOUT power_out Regulated output voltage pin; the VOUT pin potential must not exceed VIN+0.3V to avoid reverse current damage through the parasitic diode between VIN and VOUT.

Key specifications

Parameter Value
Manufacturer Shanghai Mingda Microelectronics
Package SOT-89-3L
Category Power Supply Chip
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(S) 0.98 1.02 V VIN=VOUT(S)+2V, IOUT=1mA 5
GND Current IGND 0.8 1.2 2 uA no load, VOUT(S)<3.0V, VEN=VIN 5
Input Voltage VIN 2.2 40 V 5
EN H Level Voltage VENH 1.5 40 V 5
EN L Level Voltage VENL 0 0.6 V 5
EN H Level Current IENH -0.1 0.1 uA VIN=40V, VEN=VIN 5
EN L Level Voltage IENL -0.1 0.1 uA VIN=40V, VEN=0 5
Line Regulation ΔVOUT/ΔVIN 0.01 0.02 ％/V VOUT(S)+2V≤VIN≤40V, IOUT=1mA 5
Load Regulation VOUT2 25 50 mV VIN=VOUT(S)+2V, 1mA≤IOUT≤300mA, VOUT(S)≤5.3V 5
Temperature Stability ΔVOUT/ΔT -50 50 ppm/℃ VIN=VOUT(S)+2V, IOUT=10mA, -40℃≤Ta≤125℃ 5
Shutdown Current ISHUT 0.1 1 uA VIN=40.0V, VEN=0 5
Maximum Output Current IOUTMAX 300 350 mA 5
Current Limit ILIM 350 550 mA VIN=VOUT(S)+2V, VOUT=0.95×VOUT(S) 5
Short Circuit Current ISHORT 65 mA VIN=VEN=VOUT(S)+2.0V, VOUT=0V 5
Power Supply Rejection Ratio PSRR 79 dB f=100Hz, IOUT=10mA 5
Power Supply Rejection Ratio PSRR 62 dB f=1kHz, IOUT=10mA 5
Power Supply Rejection Ratio PSRR 48 dB f=10kHz, IOUT=10mA 5
Power Supply Rejection Ratio PSRR 40 dB f=100kHz, IOUT=10mA 5
Over Temperature Protection OTP 170 ℃ IOUT=1mA 5
Input Voltage (absolute maximum) VIN -0.3 45 V Ta=25℃ unless otherwise indicated 4
Power Dissipation SOT89-3 PD 1000 mW SOT89-3 4
Thermal Resistance SOT89-3 RθJA 100 ℃/W SOT89-3 4
Operating Ambient Temperature Topr -40 85 ℃ 4
Storage Temperature Tstg -40 125 ℃ 4
ESD Protection HBM ESD HBM 5000 V 4
Output Capacitor Withstand Voltage COUT 25 V COUT=1uF, recommended withstand voltage not less than 25V 1
Output Capacitor Capacitance Change COUT -20 20 % COUT=1uF, high or low temperature 1

CAD (KiCad official)

  • Symbol: MD85A28PA1
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3L (KiCad packages3D, STEP)
  • 3D model files: md85a28pa1-etched.step / md85a28pa1-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); md85a28pa1.step / md85a28pa1.glb are the bare package body.

Provenance

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

  • Datasheet: Shanghai Mingda Microelectronics datasheet (16 pp, sha256 eb9db1999ca1681a, 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