# MS78L12

**MSKSEMI** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89

MS78L12 from MSKSEMI, in a SOT-89. 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 | VO | power_out | Regulated 12V output (11.5V min to 12.5V max at Tj=25°C), decoupled with a 0.1µF output capacitor CO, with up to 100mA maximum output current. |
| 2 | GND | power_in | Ground reference for the regulator, common to input and output capacitors. |
| 3 | VI | power_in | Unregulated input voltage, rated up to 35V absolute maximum for the 10V-15V output versions, decoupled with a 0.33µF input capacitor CI. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| Package | SOT-89 |
| 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 (Tj=25℃) | VO | 11.5 | 12 | 12.5 | V | Tj=25℃ | 6 |
| Output voltage (line and load range) | VO | 11.4 |  | 12.6 | V | VI=14.5V-27V, IO=1mA-40mA | 6 |
| Output voltage (full load) | VO | 11.4 |  | 12.6 | V | VI=19V, IO=1mA-70mA | 6 |
| Load regulation | Regload |  | 20 | 100 | mV | Tj=25℃, IO=1mA-100mA | 6 |
| Load regulation | Regload |  | 10 | 50 | mV | Tj=25℃, IO=1mA-40mA | 6 |
| Line regulation | Regline |  | 120 | 250 | mV | 14.5V≤Vi≤27V, Tj=25℃ | 6 |
| Line regulation | Regline |  | 100 | 200 | mV | 16V≤Vi≤27V, Tj=25℃ | 6 |
| Input bias current (Tj=25℃) | IIB |  | 4.2 | 6.5 | mA | Tj=25℃ | 6 |
| Input bias current (Tj=125℃) | IIB |  |  | 6 | mA | Tj=125℃ | 6 |
| Input bias current change (line) | ΔIIB |  |  | 1.5 | mA | 16V≤Vi≤27V | 6 |
| Input bias current change (load) | ΔIIB |  |  | 0.1 | mA | 1mA≤IO≤40mA | 6 |
| Ripple rejection | RR | 37 | 42 |  | dB | IO=40mA, 15V≤Vi≤25V, f=120Hz, Tj=25℃ | 6 |
| Input voltage (10V-15V output group, applies to MS78L12) | VI |  |  | 35 | V |  | 2 |
| Maximum output current | ICM |  |  | 100 | mA |  | 2 |
| Power dissipation | PD |  |  | 500 | mW |  | 2 |
| Operating junction temperature | TOPR | -40 |  | 125 | ℃ |  | 2 |
| Storage temperature range | Tj,Tstg | -40 |  | 150 | ℃ |  | 2 |

## CAD (KiCad official)

- Symbol: `MS78L12`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `ms78l12-etched.step` / `ms78l12-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ms78l12.step` / `ms78l12.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MSKSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589836578139893760) (9 pp, sha256 `48f5c06e3007f8e7`, retrieved 2026-10-19, 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/ms78l12-datasheet.pdf)