# K3A400001010G

**KYX** · Crystals · SMD3225-4P

K3A400001010G from KYX, 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 for the 40.000 MHz fundamental-mode resonator (10 pF load capacitance, 40 Ω max ESR), marked #1 on the top-view and land-pattern drawings. |
| 2 | NC | unconnected | Pad #2 appears in the package drawing, but the datasheet does not state its function; it is likely a no-connect or case pad. |
| 3 | XTAL2 | passive | Second crystal terminal for the 40.000 MHz resonator, marked #3 on the top-view drawing and diagonally opposite pad #1. |
| 4 | NC | unconnected | Pad #4 appears in the package drawing, but the datasheet does not state its function; it is likely a no-connect or case pad. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KYX |
| 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 |  | -10 |  | 10 | ppm | at 25℃±3℃ | 2 |
| Frequency stability over temperature |  | -20 |  | 20 | ppm | -40℃～+85℃ | 2 |
| Equivalent series resistance |  |  |  | 40 | Ω |  | 2 |
| Shunt capacitance |  |  |  | 5 | PF |  | 2 |
| Insulation resistance |  | 500 |  |  | MΩ | at 100 V | 2 |
| Aging |  | -3 |  | 3 | ppm/Year |  | 2 |
| Operating temperature range |  | -40 |  | 85 | ℃ |  | 2 |
| Storage temperature range |  | -40 |  | 85 | ℃ |  | 2 |
| Frequency |  |  | 40 |  | MHZ |  | 2 |
| Load capacitance (CL) | CL |  | 10 |  | PF |  | 2 |
| Drive level |  |  | 100 |  | μW |  | 2 |

## CAD (KiCad official)

- Symbol: `K3A400001010G`
- Footprint: `Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm`
- 3D model: SMD3225-4P (KiCad packages3D, STEP)
- 3D model files: `k3a400001010g-etched.step` / `k3a400001010g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `k3a400001010g.step` / `k3a400001010g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [KYX datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603092640552939520) (6 pp, sha256 `576e403b4b8913fc`, retrieved 2026-10-21, 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:** `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/k3a400001010g-datasheet.pdf)