# CJ79L08

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

CJ79L08 from Changjing, 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 | GND | power_in | Ground (common) reference terminal of the negative regulator; the datasheet gives no further electrical limits for this pin. |
| 2 | IN | power_in | Regulator input, which takes the negative unregulated supply, with an absolute maximum input voltage Vl of -30 V and a 0.33 μF input capacitor recommended for stability. |
| 3 | OUT | power_out | Regulated negative output of -8 V (VO -7.7 V to -8.3 V at 25 ℃), rated for a maximum output current IOM of 0.1 A, with a 0.1 μF output bypass capacitor recommended. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| 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 | -7.7 | -8 | -8.3 | V | 25℃ | 1 |
| Output Voltage | Vo | -7.6 | -8 | -8.4 | V | -10.5V≤Vl≤-23V, Io=1mA~40mA | 1 |
| Load Regulation | ΔVo |  | 30 | 100 | mV | Io=1mA~100mA, 25℃ | 1 |
| Load Regulation | ΔVo |  | 15 | 50 | mV | Io=1mA~40mA, 25℃ | 1 |
| Line Regulation | ΔVo |  | 42 | 200 | mV | -10.5V≤Vl≤-23V, 25℃ | 1 |
| Line Regulation | ΔVo |  | 36 | 150 | mV | -11V≤Vl≤-23V, 25℃ | 1 |
| Quiescent Current | Iq |  | 4 | 6 | mA | 25℃ | 1 |
| Quiescent Current Change | ΔIq |  |  | 1.5 | mA | -11V≤Vl≤-23V, 0-125℃ | 1 |
| Quiescent Current Change | ΔIq |  |  | 0.1 | mA | 1mA≤IO≤40mA, 0-125℃ | 1 |
| Output Noise Voltage | VN |  |  | 54 | uV | 10Hz≤f≤100KHz, 25℃ | 1 |
| Ripple Rejection | RR | 37 | 46 |  | dB | -11V≤Vl≤-21V, f=120Hz, 0-125℃ | 1 |
| Dropout Voltage | Vd |  |  | 1.7 | V | 25℃ | 1 |
| Input Voltage | Vl |  |  | -30 | V |  | 1 |
| Operating Junction Temperature Range | TOPR | 0 |  | 150 | ℃ |  | 1 |
| Storage Temperature Range | TSTG | -55 |  | 150 | ℃ |  | 1 |
| Maximum Output Current | IOM |  |  | 0.1 | A |  | 1 |
| Continuous Total Dissipation | PD |  |  | 0.5 | W |  | 1 |

## CAD (KiCad official)

- Symbol: `CJ79L08`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3 (KiCad packages3D, STEP)
- 3D model files: `cj79l08-etched.step` / `cj79l08-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cj79l08.step` / `cj79l08.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586171903212474368) (1 pp, sha256 `1502b2dbccc7ffca`, retrieved 2026-10-18, 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/cj79l08-datasheet.pdf)