# CXAF-040000-A-AL-04

**AKER** · Crystals · SMD2016-4P

CXAF-040000-A-AL-04 from AKER, in a SMD2016-4P. 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 | 1 | passive | Crystal terminal #1 of the 40.000000 MHz fundamental AT-cut crystal; the datasheet does not name its function beyond the pad number. |
| 2 | GND | power_in | Pad #2 is marked GND in the bottom-view drawing (connected to the metal lid/ground). |
| 3 | 3 | passive | Crystal terminal #3 of the 40.000000 MHz fundamental AT-cut crystal; the datasheet does not name its function beyond the pad number. |
| 4 | GND | power_in | Pad #4 is marked GND in the bottom-view drawing. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | AKER |
| Package | SMD2016-4P |
| 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 |  | -10 |  | 10 | ppm | at 25℃ ± 3℃ | 3 |
| Frequency Stability |  | -50 |  | 50 | ppm | Operating Temp (Refer 25℃) | 3 |
| Aging |  | -3 |  | 3 | ppm | First Year at 25℃ | 3 |
| Equivalent Series Resistance | ESR |  |  | 50 | Ω |  | 3 |
| Shunt Capacitance | C0 |  |  | 3 | pF |  | 3 |
| Drive Level | DL |  | 10 | 100 | uW |  | 3 |
| Operating Temperature |  | -40 |  | 125 | ℃ |  | 3 |
| Storage Temperature Range |  | -55 |  | 150 | ℃ |  | 3 |
| Nominal Frequency | FL |  | 40 |  | MHz | Fundamental, AT cut | 3 |
| Load Capacitance | CL |  | 8 |  | pF |  | 3 |
| Insulation Resistance |  | 500 |  |  | MΩ | DC 100V | 3 |

## CAD (KiCad official)

- Symbol: `CXAF-040000-A-AL-04`
- Footprint: `Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm`
- 3D model: SMD2016-4P (KiCad packages3D, STEP)
- 3D model files: `cxaf-040000-a-al-04-etched.step` / `cxaf-040000-a-al-04-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cxaf-040000-a-al-04.step` / `cxaf-040000-a-al-04.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [AKER datasheet](docs/cxaf-040000-a-al-04-datasheet.pdf) (9 pp, sha256 `6cb5474a7c83f2b6`, retrieved 2026-10-24, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/cxaf-040000-a-al-04-datasheet.pdf)