# CM4040M00012

**JWT** · Crystals · SMD2520-4P

CM4040M00012 from JWT, in a SMD2520-4P. 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, connected to one side of the crystal element (diagonal to pin 3) per the top-view crystal connection drawing. |
| 2 | GND | power_in | Marked GND in the top-view crystal connection drawing; not connected to the crystal element. |
| 3 | XTAL2 | passive | Crystal terminal 2, connected to the other side of the crystal element (diagonal to pin 1) per the top-view crystal connection drawing. |
| 4 | GND | power_in | Marked GND in the top-view crystal connection drawing; not connected to the crystal element. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | JWT |
| Package | SMD2520-4P |
| 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 deviation | FL | -10 |  | 10 | ppm | 25±2℃ | 4 |
| Temperature frequency deviation | TC | -30 |  | 30 | ppm | Reference temperature 25℃ | 4 |
| Resonance resistance | RR |  |  | 40 | Ω |  | 4 |
| Static (shunt) capacitance | C0 |  |  | 3 | pF |  | 4 |
| Insulation resistance | IR | 500 |  |  | MΩ | at DC 100V | 4 |
| Spurious attenuation | SPDB |  |  | -3 | dB | F0±500KHz | 4 |
| Aging rate |  | -3 |  | 3 | ppm | First year | 4 |
| Excitation (drive) power | DL | 1 | 100 | 200 | uW |  | 4 |
| Operating temperature |  | -40 |  | 85 | ℃ |  | 4 |
| Storage temperature range |  | -55 |  | 125 | ℃ |  | 4 |
| Nominal frequency | F0 |  | 40 |  | MHz |  | 4 |
| Load capacitance | CL |  | 12 |  | pF |  | 4 |

## CAD (KiCad official)

- Symbol: `CM4040M00012`
- Footprint: `Crystal:Crystal_SMD_2520-4Pin_2.5x2.0mm`
- 3D model: SMD2520-4P (KiCad packages3D, STEP)
- 3D model files: `cm4040m00012-etched.step` / `cm4040m00012-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cm4040m00012.step` / `cm4040m00012.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [JWT datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603183958259609600) (10 pp, sha256 `7c8152cf837dbb58`, retrieved 2026-10-16, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/cm4040m00012-datasheet.pdf)