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MD8312A

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

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MD8312A

Shanghai Mingda Microelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3

MD8312A 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 reference pin; for the short-circuit current test, VOUT must be shorted to GND with an impedance below 0.1 ohm.
2 VIN power_in Input supply pin; the datasheet gives an input voltage range of 2.2 V to 40 V, with absolute maximum input voltage of -0.3 V to 45 V.
3 VOUT power_out Regulated output pin delivering up to 300 mA; its potential must not exceed VIN + 0.3 V to avoid reverse current through the parasitic diode between VIN and VOUT.

Key specifications

Parameter Value
Manufacturer Shanghai Mingda Microelectronics
Package SOT-89-3
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
Input Voltage VIN 2.2 40 V 3
Input Voltage (absolute maximum) VIN -0.3 45 V Unless otherwise indicated Ta=25℃ 2
Operating Ambient Temperature Topr -40 85 ℃ 2
Output Voltage Accuracy VOUT -2 2 ％ Feature list: Output Voltage Highly Accurate ±2％ 1
Temperature Stability -50 50 ppm/℃ VIN = VOUT(S)+2V, IOUT=10mA, -40℃≤Ta≤125℃ 3
Load Regulation VOUT2 50 80 mV VIN=VOUT(S)+2V, 1mA≤IOUT≤300mA, VOUT(S)>5.3V 3
Line Regulation 0.01 0.02 ％/V VOUT(S)+2V≤VIN≤40V, IOUT=1mA 3
GND Current IGND 1.5 2.3 3.5 uA no load, VOUT(S)>5.3V 3
GND Current at load IGND 460 uA IOUT=100mA 3
Maximum Output Current IOUTMAX 300 350 mA 3
Current Limit ILIM 350 550 mA VIN= VOUT(S)+2V, VOUT = 0.95×VOUT(S) 3
Short Circuit Current ISHORT 65 mA VIN=VOUT(S)+2.0V, VOUT=0V 3
Over Temperature Protection OTP 170 ℃ IOUT=1mA 3
Nominal Output Voltage (12V variant) VOUT(S) 12 V Product selection 8312A/8312; VIN=VOUT(S)+2V, IOUT=1mA 2
Power Dissipation SOT89-3 PD 1000 mW Unless otherwise indicated Ta=25℃ 2
Thermal Resistance Junction-to-Board SOT89-3 RθJB 100 ℃/W Mounted on JEDEC standard 4-layer (2s2p) PCB 2
Storage Temperature Tstg -40 125 ℃ 2
ESD Protection HBM ESD HBM 1500 V 2
Input Capacitor CIN CIN 1 µF Notes on Use: 1.0µF above 4
Output Capacitor COUT COUT 1 µF Notes on Use: 1.0µF above 4

CAD (KiCad official)

  • Symbol: MD8312A
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3 (KiCad packages3D, STEP)
  • 3D model files: md8312a-etched.step / md8312a-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); md8312a.step / md8312a.glb are the bare package body.

Provenance

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

  • Datasheet: Shanghai Mingda Microelectronics datasheet (10 pp, sha256 b90bf74c0495d786, retrieved 2026-10-21, 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