# 2X040000BP

**huaxindianzi** · Crystals · SMD2520-4P

2X040000BP from huaxindianzi, 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 of the 40.000 MHz fundamental AT-cut crystal (12 pF load capacitance), marked with the corner chamfer on the bottom view. |
| 2 | GND | power_in | Ground pin, connected to the lid/case per the top-view crystal connection drawing. |
| 3 | XTAL2 | passive | Crystal terminal 2 of the 40.000 MHz fundamental AT-cut crystal (12 pF load capacitance). |
| 4 | GND | power_in | Ground pin, connected to the lid/case per the top-view crystal connection drawing. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | huaxindianzi |
| Package | SMD2520-4P |
| Category | Resonators/Oscillators |
| 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℃±℃ | 4 |
| Temperature frequency deviation (printed English label 'Equivalent Series Resistance' is misaligned) |  | -30 |  | 30 | ppm |  | 4 |
| Operating Temperature | TC | -40 |  | 85 | ℃ |  | 4 |
| Resonant resistance | RR |  |  | 60 | Ω |  | 4 |
| Direct capacitance | C0 |  |  | 3 | pF |  | 4 |
| Insulation resistance | IR | 500 |  |  | MΩ | At DC 100V | 4 |
| Parasitic attenuation | SPDB |  |  | -3 | dB |  | 4 |
| Aging rate |  | -2 |  | 2 | ppm | First year | 4 |
| Storage temperature range |  | -55 |  | 125 | ℃ |  | 4 |
| Nominal Frequency | FL |  | 40 |  | MHz |  | 4 |
| Load Capacitance | CL |  | 12 |  | pF |  | 4 |
| Drive Level | DL |  | 400 |  | μW |  | 4 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | gold | Pin Au Conducting rein Ag+硅树脂 | 6 |

## CAD (KiCad official)

- Symbol: `2X040000BP`
- Footprint: `Crystal:Crystal_SMD_2520-4Pin_2.5x2.0mm`
- 3D model: SMD2520-4P (KiCad packages3D, STEP)
- 3D model files: `2x040000bp-etched.step` / `2x040000bp-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2x040000bp.step` / `2x040000bp.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [huaxindianzi datasheet](docs/2x040000bp-datasheet.pdf) (9 pp, sha256 `85feaa71487d0cd4`, 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:** 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/2x040000bp-datasheet.pdf)