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MD8240A

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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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MD8240A

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

MD8240A 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 for the regulator, which must be wired with low impedance, and the output capacitor should be placed close to the VOUT-GND pins.
2 VIN power_in Regulator input supply with an absolute maximum of -0.3 to 45 V and 40 V maximum input for regulated output, requiring an input capacitor of 1.0 uF or more.
3 VOUT power_out Regulated 4.0 V output (MD8240, 3.88 to 4.12 V) with 150 mA rated load and about 300 mA typical current limit, which must not exceed VIN+0.3 V and needs an output capacitor of 2.2 uF or more.

Key specifications

Parameter Value
Manufacturer Shanghai Mingda Microelectronics
Package SOT-89-3
Category Power Management ICs
Pins 3

CAD (KiCad official)

  • Symbol: MD8240A
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3 (KiCad packages3D, STEP)
  • 3D model files: md8240a-etched.step / md8240a-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); md8240a.step / md8240a.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 bd4aefd613b0a967, retrieved 2026-10-27, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • 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