# CJ809C263M

**Changjing** · Supervisor and Reset ICs · SOT-23-3L

CJ809C263M from Changjing, in a SOT-23-3L. 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 | VSS | power_in | Ground reference (0 V). Common return for supply and output. |
| 2 | VOUT | output | Voltage detection output pin, CMOS push-pull, active-low. Asserts low when VDD falls below -VDET (2.63 V); returns high after the internal 210 ms (typ) release delay once VDD recovers above -VDET+VHYS. |
| 3 | VDD | power_in | Positive supply and monitored input. Operating range 0.95 V to 7.0 V; absolute max VSS-0.3 V to VSS+8 V. |

## Key specifications

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

## Ordering variants

Same part, different packaging or reel option.

- `CJ809C263MM`
- `CJ809C263MN`
- `CJ809C263MP`

## CAD (KiCad official)

- Symbol: `CJ809C263M`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files: `cj809c263m-etched.step` / `cj809c263m-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cj809c263m.step` / `cj809c263m.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](docs/cj809c263m-datasheet.pdf) (7 pp, sha256 `4ee2baf6f08f1bd1`, 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/cj809c263m-datasheet.pdf)