# CJ13-250001210A20

**Changjing** · Crystals · SMD3225-4P

CJ13-250001210A20 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 1 (chamfered index pad) connected to one side of the 25MHz, 12pF load, fundamental-mode resonator in the pad-layout drawing. |
| 2 | NC | unconnected | Pad 2 is not connected to the resonator symbol in the pad-layout drawing and has no function stated. |
| 3 | XTAL2 | passive | Crystal terminal 2 connected to the other side of the 25MHz, 12pF load, fundamental-mode resonator in the pad-layout drawing. |
| 4 | NC | unconnected | Pad 4 is not connected to the resonator symbol in the pad-layout drawing and has no function stated. |

## Key specifications

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

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Frequency tolerance | △f/f | -10 |  | 10 | ppm |  | 2 |
| Frequency temperature stability |  | -20 |  | 20 | ppm |  | 2 |
| Resonance resistance |  |  |  | 60 | ohms | Fundamental mode | 2 |
| Shunt capacitance | C0 |  |  | 2 | pF |  | 2 |
| Drive level | DL |  |  | 100 | μW |  | 2 |
| Operating temperature range | TOPR | -20 |  | 70 | °C |  | 2 |
| Storage temperature range | TSTG | -55 |  | 125 | °C |  | 2 |
| Insulation resistance | IR | 500 |  |  | M ohms |  | 2 |
| Aging | △fA | -3 |  | 3 | ppm | per year | 2 |
| Nominal frequency | f |  | 25 |  | MHz |  | 2 |
| Load capacitance | CL |  | 12 |  | pF |  | 2 |

## CAD (KiCad official)

- Symbol: `CJ13-250001210A20`
- Footprint: `Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm`
- 3D model: SMD3225-4P (KiCad packages3D, STEP)
- 3D model files: `cj13-250001210a20-etched.step` / `cj13-250001210a20-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cj13-250001210a20.step` / `cj13-250001210a20.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/8588949760640225280) (6 pp, sha256 `e44a9f86132f81ae`, retrieved 2026-10-21, 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/cj13-250001210a20-datasheet.pdf)