# CJ13-120001210B20

**Changjing** · Crystals · SMD3225-4P

CJ13-120001210B20 from Changjing, in a SMD3225-4P. 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 | XTAL1 | passive | Crystal terminal connected to one side of the 12.000MHz resonator element, load capacitance 12pF, no polarity stated. |
| 2 | GND | power_in | Ground pad marked GND in the internal view connection, not connected to the crystal element. |
| 3 | XTAL2 | passive | Crystal terminal connected to the other side of the 12.000MHz resonator element, load capacitance 12pF, no polarity stated. |
| 4 | GND | power_in | Ground pad marked GND in the internal view connection, not connected to the crystal element. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SMD3225-4P |
| Category | Crystals, Oscillators, Resonators |
| Pins | 4 |

## CAD (KiCad official)

- Symbol: `CJ13-120001210B20`
- Footprint: `Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm`
- 3D model: SMD3225-4P (KiCad packages3D, STEP)
- 3D model files: `cj13-120001210b20-etched.step` / `cj13-120001210b20-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cj13-120001210b20.step` / `cj13-120001210b20.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/8588919251734573056) (8 pp, sha256 `e33c13bbc7c6ccfa`, retrieved 2026-10-13, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/cj13-120001210b20-datasheet.pdf)