# MD5313

**Shanghai Mingda Microelectronics** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-3L

MD5313 from Shanghai Mingda Microelectronics, in a SOT-23-3L. 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 pin, reference for the 1.3V ±2% output; keep its wiring low impedance and place the output capacitor close to VOUT and GND. |
| 2 | VOUT | power_out | Regulated 1.3V ±2% output delivering at least 500mA, requiring a 2.2µF or larger output capacitor (ESR 0.5~5Ω recommended), short-circuit current typically 50mA, and must not exceed VIN+0.3V. |
| 3 | VIN | power_in | Input supply pin with operating input voltage up to 10V (absolute maximum 12V), requiring an input capacitor of 1.0µF or more. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shanghai Mingda Microelectronics |
| Package | SOT-23-3L |
| 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 |  |  | 12 | V |  | 2 |
| Power dissipation (SOT-23) | PD |  |  | 250 | mW | SOT-23 package | 2 |
| Operating ambient temperature range | TOPR | -40 |  | 85 | ℃ |  | 3 |
| Storage ambient temperature range | TSTG | -40 |  | 125 | ℃ |  | 3 |
| Input voltage | VIN |  |  | 10 | V |  | 3 |
| Output current | IOUT | 500 |  |  | mA | VIN=VOUT+1V | 3 |
| Output voltage accuracy (product table tolerance) |  | -2 |  | 2 | % |  | 2 |
| Input stability | ΔVOUT1/ΔVIN*VOUT |  | 0.15 | 0.3 | %/V | VOUT+1V≤VIN≤10V, IOUT=10mA | 3 |
| Load stability | ΔVOUT2 |  | 15 | 30 | mV | VIN=VOUT+1V, 1mA≤IOUT≤100mA | 3 |
| Output voltage temperature coefficient | ΔVOUT/ΔTa*VOUT | -100 | 50 | 100 | ppm/℃ | VIN=VOUT+1V, IOUT=1mA, -40℃≤Ta≤125℃ | 3 |
| Quiescent (ground) current | ISS1 |  | 1.2 | 2.5 | uA | VIN=10V, no load | 3 |
| Output short-circuit current | ISHORT | 50 |  | 70 | mA | VOUT=0V | 3 |
| Power supply ripple rejection | PSRR | 40 |  |  | dB | f=100Hz, IOUT=10mA | 3 |
| Power supply ripple rejection | PSRR | 20 |  |  | dB | f=1kHz, IOUT=10mA | 3 |
| Thermal resistance, junction to ambient (SOT-23) | RθJA |  | 200 |  | ℃/W | SOT-23 package | 3 |

## CAD (KiCad official)

- Symbol: `MD5313`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files: `md5313-etched.step` / `md5313-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `md5313.step` / `md5313.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shanghai Mingda Microelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590359938217512960) (17 pp, sha256 `0399e6cc194b1b17`, retrieved 2026-10-21, 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](docs/md5313-datasheet.pdf)