# MD7333

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

MD7333 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 (VSS) pin, the leftmost lead in the SOT-89 package drawing. |
| 2 | VDD | power_in | Positive input supply (VIN); absolute maximum 18 V, recommended input capacitor 1.0 µF or more. |
| 3 | OUT | power_out | Regulated 3.3 V ±2% output (MD7333), up to 300 mA; needs an output capacitor of 2.2 µF or more (tantalum recommended) between VOUT and VSS. |

## 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 |
|---|---|---|---|---|---|---|---|
| Output voltage | VOUT | 3.234 | 3.3 | 3.366 | V | VIN= 5.3V，IOUT=10mA | 4 |
| Output current | IOUT | 300 |  |  | mA | VIN= 5.3V | 4 |
| Input-output voltage difference (dropout) | Vdrop |  |  | 220 | mV | IOUT=100 mA | 4 |
| Input-output voltage difference (dropout) | Vdrop |  |  | 5 | mV | IOUT=1 mA | 4 |
| Input stability | △VOUT1/△VIN·VOUT |  | 0.05 | 0.2 | ％/V | 4.3V≤VIN≤15V IOUT=1mA | 4 |
| Load stability | △VOUT2 |  | 60 | 100 | mV | VIN=5.3V 1.0mA≤IOUT≤300mA | 4 |
| Output voltage temperature coefficient | △VOUT/△Ta·VOUT | -100 | 50 | 100 | Ppm/℃ | VIN=5.3V，IOUT=10mA -40℃≤Ta≤85℃ | 4 |
| Current consumption | ISS1 |  | 1.2 | 2.5 | uA | VIN=15V 无负载 | 4 |
| Input voltage | VIN |  |  | 18 | V |  | 4 |
| Output short-circuit current | Ilim | 15 |  | 50 | mA | Vout=0V | 4 |
| Input voltage (absolute maximum) | VIN |  |  | 18 | V |  | 2 |
| Power dissipation (absolute maximum) | PD |  |  | 300 | Mw | SOT_89 | 2 |
| Operating ambient temperature range | Topr | -40 |  | 85 | ℃ |  | 2 |
| Storage ambient temperature range (absolute maximum) | Tstg | -40 |  | 125 | ℃ |  | 2 |
| Input capacitor | CIN | 1 |  |  | µF |  | 6 |
| Output capacitor | CL | 2.2 |  |  | µF | 钽电容器 (tantalum) | 6 |

## CAD (KiCad official)

- Symbol: `MD7333`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3 (KiCad packages3D, STEP)
- 3D model files: `md7333-etched.step` / `md7333-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `md7333.step` / `md7333.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/8589784911243739136) (13 pp, sha256 `f5efc29fea38182c`, retrieved 2026-10-19, 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/md7333-datasheet.pdf)