# 78M05-MS

**MSKSEMI** · Linear Voltage Regulators (LDO) · TO-252

78M05-MS from MSKSEMI, in a TO-252. 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 | IN | power_in | Unregulated input supply pin, rated to a maximum input voltage Vi of 35 V and specified for operation with 7 V ≤ Vi ≤ 20 V. |
| 2 | GND | power_in | Common ground reference pin for the regulator, which is connected to the input and output capacitors in the typical application circuit. |
| 3 | OUT | power_out | Regulated 5 V output pin, specified at 4.75 V to 5.25 V over 0 to 125 ℃ with a maximum output current of 0.5 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| Package | TO-252 |
| Category | Power Supply Chip |
| 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 (25℃) | Vo | 4.8 | 5 | 5.2 | V | 25℃; 7V≤Vi≤20V, Io=5mA-350mA, Po≤15W | 2 |
| Output voltage (0-125℃) | Vo | 4.75 | 5 | 5.25 | V | 0-125℃; 7V≤Vi≤20V, Io=5mA-350mA, Po≤15W | 2 |
| Input voltage | Vi |  |  | 35 | V |  | 2 |
| Operating junction temperature range | TOPR | 0 |  | 125 | ℃ | Operating temperature range applies unless otherwise specified | 2 |
| Storage temperature range | TSTG | -65 |  | 150 | ℃ |  | 2 |
| Load regulation | ΔVo |  | 15 | 100 | mV | Io=5mA-0.5A, 25℃ | 2 |
| Load regulation | ΔVo |  | 5 | 50 | mV | Io=5mA-200mA, 25℃ | 2 |
| Line regulation | ΔVo |  | 3 | 100 | mV | 7V≤Vi≤25V, Io=200mA, 25℃ | 2 |
| Line regulation | ΔVo |  | 1 | 50 | mV | 8V≤Vi≤25V, Io=200mA, 25℃ | 2 |
| Quiescent current | Iq |  | 4.2 | 6 | mA | 25℃ | 2 |
| Quiescent current change | ΔIq |  |  | 0.8 | mA | 8V≤Vi≤25V, Io=200mA, 0-125℃ | 2 |
| Quiescent current change | ΔIq |  |  | 0.5 | mA | 5mA≤IO≤350mA, 0-125℃ | 2 |
| Output noise voltage | VN |  | 40 | 200 | uV | 10Hz≤f≤100KHz, 25℃ | 2 |
| Ripple rejection | RR | 62 | 80 |  | dB | 8V≤Vi≤18V, f=120Hz, Io=300mA, 0-125℃ | 2 |
| Dropout voltage | Vd |  | 2 | 2.5 | V | Io=350mA, 25℃ | 2 |
| Short circuit current | Isc |  | 300 |  | mA | Vi=10V, 25℃ | 2 |
| Peak current | Ipk |  | 0.5 |  | A | 25℃ | 2 |

## CAD (KiCad official)

- Symbol: `78M05-MS`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: TO-252 (KiCad packages3D, STEP)
- 3D model files: `78m05-ms-etched.step` / `78m05-ms-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `78m05-ms.step` / `78m05-ms.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MSKSEMI datasheet](docs/78m05-ms-datasheet.pdf) (5 pp, sha256 `61e2a52ba25efac8`, retrieved 2026-11-05, 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](docs/78m05-ms-datasheet.pdf)