# PJ78L05SQ

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

PJ78L05SQ from PJSEMI, 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 | OUT | power_out | Regulated 5 V output, rated for up to 100 mA output current with internal thermal overload and short-circuit limiting. |
| 2 | GND | power_in | Ground reference pin for the regulator, shared between input and output. |
| 3 | IN | power_in | Unregulated input voltage, rated up to 30 V maximum. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | PJSEMI |
| 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 | VO | 4.8 | 5 | 5.2 | V | IO=40mA TJ=25℃ | 1 |
| Output Voltage | VO | 4.75 | 5 | 5.25 | V | IO=1mA to 40mA VI=7V to 20V | 1 |
| Line Regulation | ΔVo |  | 32 | 150 | mV | VI=7V to 20V TJ=25℃ | 1 |
| Line Regulation | ΔVo |  | 26 | 100 | mV | VI=8V to 20V TJ=25℃ | 1 |
| Load Regulation | ΔVO |  | 15 | 60 | mV | IO=1mA to 100mA TJ=25℃ | 1 |
| Load Regulation | ΔVO |  | 8 | 30 | mV | IO=1mA to 40 mA TJ=25℃ | 1 |
| Ripple Rejection | RR | 41 | 49 |  | dB | VI=8V to 18V TJ=25℃ f=120Hz | 1 |
| Quiescent Current | IQ |  | 3.8 | 6 | mA | TJ=25℃ | 1 |
| Quiescent Current | IQ |  |  | 5.5 | mA | TJ=125℃ | 1 |
| Quiescent Current Change | ΔIQ |  |  | 1.5 | mA | VI=8V to 20V | 1 |
| Quiescent Current Change | ΔIQ |  |  | 0.1 | mA | IO=1mA to 40mA | 1 |
| Input Voltage | VI |  |  | 30 | V |  | 1 |
| Output Current | IO |  |  | 100 | mA |  | 1 |
| Junction Temperature | TJ |  |  | 150 | ℃ |  | 1 |
| Power Dissipation | PD |  |  | 500 | mW |  | 1 |
| Storage Temperature Range | TSTG | -55 |  | 150 | ℃ |  | 1 |
| Operating Temperature Range | TOPR | -40 |  | 125 | ℃ |  | 1 |
| Output Noise Voltage | eN |  | 42 |  | μV | f=10Hz~100KHz TJ=25℃ | 1 |
| Dropout Voltage | VD |  | 1.7 |  | V | TJ=25℃ | 1 |

## CAD (KiCad official)

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

## Provenance

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

- **Datasheet:** [PJSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588906411190968320) (3 pp, sha256 `9b30a43953def79b`, retrieved 2026-10-17, 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/pj78l05sq-datasheet.pdf)