# CJ7808B-TCN-ATG

**Changjing** · Linear Voltage Regulators (LDO) · TO-220F

CJ7808B-TCN-ATG from Changjing, in a TO-220F. 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 | IN | power_in | Input of the device. |
| 2 | GND | power_in | Regulator ground. |
| 3 | OUT | power_out | Output of the device. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | TO-220F |
| Category | Power Management |
| 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 (±2% grade, TJ = 25°C) | VOUT | 7.84 | 8 | 8.16 | V | TJ = 25°C, ±2% grade | 12 |
| Output voltage (over line, load and temperature) | VOUT | 7.7 | 8 | 8.3 | V | IOUT = 5mA to 1A, VIN = 10.6V to 23V, TJ = -40 to 125°C, PD ≤ 15W | 12 |
| Line regulation | ΔVRLINE |  | 25 | 75 | mV | VIN = 10.6 to 23V, IOUT = 500mA | 12 |
| Load regulation | ΔVRLOAD |  | 25 | 75 | mV | VIN = 14V, IOUT = 5mA to 1A | 12 |
| Quiescent current | IQ |  | 3.2 | 6 | mA | VIN = 14V, TJ = -40 to 125°C, IOUT = 0mA | 12 |
| Quiescent current change (load) | ΔIQ |  | 0.1 | 0.8 | mA | VIN = 14V, IOUT = 5mA to 1A | 12 |
| Quiescent current change (line) | ΔIQ |  | 0.3 | 0.8 | mA | VIN = 10.6 to 23V, IOUT = 500mA | 12 |
| Short circuit current | ISC | 200 |  |  | mA | VIN = 35V, TA = 25°C | 12 |
| Input voltage range (CJ7808B) | VIN |  |  | 28 | V |  | 8 |
| Operating junction temperature | TJ | -40 |  | 125 | °C |  | 8 |
| Maximum input voltage range | VIN MAX |  |  | 36 | V | All voltages with respect to network ground terminal | 8 |
| Maximum output current | IOUT MAX |  |  | 1 | A |  | 8 |
| Maximum junction temperature | TJ Max |  |  | 150 | °C |  | 8 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 8 |
| Soldering temperature | Tsolder |  |  | 260 | °C | 10s | 8 |
| Junction-to-ambient thermal resistance (TO-220F) | RθJA |  | 66.4 |  | °C/W | TA = 25°C, still air, PCB soldered without extra heat dissipation pads | 9 |
| Junction-to-case thermal resistance (TO-220F) | RθJC |  | 6.2 |  | °C/W | TO-220F | 9 |
| Reference maximum power dissipation for continuous operation (TO-220F) | PD Ref |  | 1.51 |  | W | TA = 25°C, still air, PCB soldered without extra heat dissipation pads | 9 |

## CAD (KiCad official)

- Symbol: `CJ7808B-TCN-ATG`
- Footprint: `Package_TO_SOT_THT:TO-220F-3_Vertical`
- 3D model: TO-220F (KiCad packages3D, STEP)

## Provenance

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

- **Datasheet:** [Changjing datasheet](docs/cj7808b-tcn-atg-datasheet.pdf) (33 pp, sha256 `2bf7e0142c58a2c8`, retrieved 2026-11-12, 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/cj7808b-tcn-atg-datasheet.pdf)