# PJ78L05SQ-N

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

PJ78L05SQ-N from PJSEMI, in a SOT-89-3. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | OUT | power_out | Regulated 5V output. Typical VO = 5.0 V (4.75 V to 5.25 V over IO = 1 mA to 100 mA). Requires a 0.1 µF output decoupling capacitor to ground for stability. |
| 2 | GND | power_in | Ground / common return for the regulator. On SOT-89 this pin is also the large center tab used as the thermal/heat-sinking pad. |
| 3 | IN | power_in | Unregulated input voltage, up to 35 V absolute maximum. Requires a 0.33 µF input capacitor to ground close to the pin as recommended by the application circuit. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | PJSEMI |
| Package | SOT-89-3 |
| Category | PMIC |
| Pins | 3 |

## Ordering variants

Same part, different packaging or reel option.

- `PJ78L05SQ-N`

## CAD (KiCad official)

- Symbol: `PJ78L05SQ-N`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3 (KiCad packages3D, STEP)
- 3D model files: `pj78l05sq-n-etched.step` / `pj78l05sq-n-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `pj78l05sq-n.step` / `pj78l05sq-n.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [PJSEMI datasheet](docs/pj78l05sq-n-datasheet.pdf) (3 pp, sha256 `e0da4f4bfedb7582`, retrieved 2026-08-17, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/pj78l05sq-n-datasheet.pdf)