component
MD52E21QA3
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Shanghai Mingda Microelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-3L. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+47@@ -0,0 +1,47 @@+# MD52E21QA3++**Shanghai Mingda Microelectronics** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-3L++MD52E21QA3 from Shanghai Mingda Microelectronics, in a SOT-23-3L. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | GND | power_in | Device ground reference. Connect to system ground plane; place input and output ceramic capacitors as close as possible to this pin. |+| 2 | VOUT | power_out | Regulated 2.1V output (VOUT(S)=2.1V, tolerance +/-2%). Delivers up to 500mA (typ), current-limited at ~750mA with foldback to ~50mA under short circuit. Requires >=1.0uF low-ESR ceramic output capacitor for stability. |+| 3 | VIN | power_in | Unregulated input supply, 2.2V to 7.0V operating (absolute max 8V). Requires >=1.0uF ceramic input capacitor placed close to the pin. VOUT must not exceed VIN+0.3V to avoid parasitic-diode reverse conduction. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Shanghai Mingda Microelectronics |+| Package | SOT-23-3L |+| Category | PMIC |+| Pins | 3 |++## Ordering variants++Same part, different packaging or reel option.++- `MD52E21QA3`+- `MD52E21QA3QC3`+- `MD52E21QA3PA1`+- `MD52E21QA3WB6`++## CAD (KiCad official)++- Symbol: `MD52E21QA3`+- Footprint: `Package_TO_SOT_SMD:SOT-23-3`+- 3D model: SOT-23-3L (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Shanghai Mingda Microelectronics datasheet](docs/md52e21qa3-datasheet.pdf) (14 pp, sha256 `11f4b5d8b0feb201`, retrieved 2026-08-17, tier: lcsc)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/md52e21qa3-datasheet.pdf)
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