# CJ75L05S

**Changjing** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23

CJ75L05S from Changjing, in a SOT-23. 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 output voltage pin. Provides the fixed 5.0 V output for the CJ75L05S variant, capable of sourcing up to 300 mA. A 1 μF output capacitor is required for stability, transient response, and PSRR. |
| 2 | IN | power_in | Unregulated input supply pin. Operating input voltage range 2.5 V to 36 V (absolute max 40 V). A 1 μF input capacitor is recommended for stability. |
| 3 | GND | power_in | Ground / VSS reference for the regulator. All voltages in the datasheet are referenced to this network ground terminal. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-23 |
| Category | PMIC |
| Pins | 3 |

## Ordering variants

Same part, different packaging or reel option.

- `CJ75L05SS`

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| DC Output Accuracy |  | -2 |  | 2 | % | IOUT=1mA | 3 |
| Supply Current | ISS |  | 2 | 5 | μA | IOUT=0A | 3 |
| Line Regulation |  |  | 0.01 | 0.3 | %/V | IOUT =10mA, VOUT +1V≤VIN≤36V | 3 |
| Input Voltage | VIN | 2.5 |  | 36 | V |  | 3 |
| Supply voltage at VIN | VIN | 2.5 |  | 36 | V |  | 2 |
| Operating junction temperature range | Tj | -40 |  | 125 | °C |  | 2 |
| Operating free air temperature range | TA | -40 |  | 85 | °C |  | 2 |
| Input Voltage | VIN | -0.3 |  | 40 | V |  | 2 |
| Output Voltage | VOUT | -0.3 |  | 13 | V |  | 2 |
| Power Dissipation | PD |  |  | 0.6 | W |  | 2 |
| Operating Ambient Temperature Range | TA | -40 |  | 85 | °C |  | 2 |
| Storage Temperature | Tstg | -40 |  | 125 | °C |  | 2 |
| Lead Temperature (Soldering) | Tsolder |  |  | 260 | °C | 10 sec | 2 |
| Operating Junction Temperature Range | Tj | -40 |  | 125 | °C |  | 2 |

## CAD (KiCad official)

- Symbol: `CJ75L05S`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `cj75l05s-etched.step` / `cj75l05s-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cj75l05s.step` / `cj75l05s.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`cj75l05s.step`](cj75l05s.step) | 59 KB | You want the bare part, or you mark your own boards. |
| [`cj75l05s-etched.step`](cj75l05s-etched.step) | 1.5 MB | You want the part with `CJ75L05S` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 365 faces against 69 in the bare model. It
survives export, section views, and rendering in any CAD tool, and it drops straight
into KiCad or Fusion with no extra setup.

## Provenance

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

- **Datasheet:** [Changjing datasheet](docs/cj75l05s-datasheet.pdf) (7 pp, sha256 `ef71892bf7da9961`, 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/cj75l05s-datasheet.pdf)