# SK78M05

**Suntek** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-252

SK78M05 from Suntek, 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 | VIN | power_in | Input supply pin; absolute maximum input voltage is 35 V and input must stay typically 2.0 V above the output, with a 0.33uF bypass capacitor recommended. |
| 2 | GND | power_in | Ground, common to input and output voltages. |
| 3 | VOUT | power_out | Regulated output delivering up to 500 mA, with a 0.1uF output capacitor improving transient response but not needed for stability. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Suntek |
| Package | TO-252 |
| 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 accuracy (tolerance) |  | -5 |  | 5 | % |  | 1 |
| Output Voltage | Vout | 0.964 |  | 1.036 | vout (multiplier) | Io=40mA, VIN=10V | 3 |
| Output Voltage | Vout | 0.96 |  | 1.04 | vout (multiplier) | Io=1mA~40mA, VIN=7V~18V | 3 |
| Output Voltage | Vout | 0.95 |  | 1.05 | vout (multiplier) | Io=1mA~10mA, VIN=10V | 3 |
| Line Regulation | LNR | -150 |  | 150 | mV | VIN=7V~18V, Io=40mA | 3 |
| Line Regulation | LNR | -100 |  | 100 | mV | VIN=8V~18V, Io=40mA | 3 |
| Load Regulation | LDR | -60 |  | 60 | mV | VIN=10V, Io=1mA~100mA | 3 |
| Load Regulation | LDR | -30 |  | 30 | mV | VIN=10V, Io=1mA~40mA | 3 |
| Quiescent Current | IQ |  |  | 5.5 | mA | VIN=10V, IOUT=40mA | 3 |
| Quiescent Current Change | △IQ | -1.5 |  | 1.5 | mA | VIN=8V~18V, IO=40mA | 3 |
| Quiescent Current Change | △IQ | -0.1 |  | 0.1 | mA | VIN=10V, IOUT=1mA~40mA | 3 |
| Input supply voltage | VIN |  |  | 35 | V |  | 2 |
| MAX. Output current | Iout |  |  | 500 | mA |  | 2 |
| MAX Power | Pmax |  |  | 1.5 | W |  | 2 |
| Maximum junction temperature | Tj | -40 |  | 125 | ℃ |  | 2 |
| Storage temperature | Tstr | -55 |  | 125 | ℃ |  | 2 |
| Soldering temperature and time |  |  |  | 260 | ℃ | Recommended 10S | 2 |

## CAD (KiCad official)

- Symbol: `SK78M05`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: TO-252 (KiCad packages3D, STEP)
- 3D model files: `sk78m05-etched.step` / `sk78m05-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sk78m05.step` / `sk78m05.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Suntek datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590261041998835712) (8 pp, sha256 `15987200a3b64753`, retrieved 2026-10-17, tier: lcsc)
- **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/sk78m05-datasheet.pdf)