# 2.3.3.250001255

**MDH** · Crystals · SMD3225-4P

2.3.3.250001255 from MDH, 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 of the 25.000000 MHz fundamental AT-cut crystal, with 12 pF load capacitance specified. |
| 2 | GND | power_in | Ground pad, marked GND in the internal view connection drawing, connected to the lid/case. |
| 3 | XTAL2 | passive | Crystal terminal 2 of the 25.000000 MHz fundamental AT-cut crystal, with 12 pF load capacitance specified. |
| 4 | GND | power_in | Ground pad, marked GND in the internal view connection drawing, connected to the lid/case. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MDH |
| 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 (ΔF/F0) | △F/F0 | -10 |  | 10 | ppm | At 25℃±3℃ | 4 |
| Equivalent Series resistance (ESR) | ESR |  |  | 40 | Ω |  | 4 |
| Drive Level (DL) | DL | 0.01 | 100 | 150 | uW |  | 4 |
| Storage temperature range |  | -55 |  | 125 | ℃ |  | 4 |
| Operating temperature range |  | -40 |  | 85 | ℃ | Ref. to 25℃ | 4 |
| Temperature stability (over operating temperature) |  | -15 |  | 15 | ppm | Ref. to 25℃ | 4 |
| Shunt Capacitance (C0) | C0 |  |  | 3 | pF |  | 4 |
| RLD2 | RLD2 |  |  | 40 | Ω |  | 4 |
| Aging |  | -3 |  | 3 | ppm/Year | 1st Year | 4 |
| SPDB | SPDB |  |  | -3 | dB | -200 ~ +400kHz / 20points | 4 |
| Insulation Resistance |  | 500 |  |  | MΩ | At DC 100±15V | 4 |
| Frequency (FL) nominal | FL |  | 25 |  | MHz |  | 4 |
| Loading capacitance (CL) | CL |  | 12 |  | pF |  | 4 |

## CAD (KiCad official)

- Symbol: `2.3.3.250001255`
- Footprint: `Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm`
- 3D model: SMD3225-4P (KiCad packages3D, STEP)
- 3D model files: `2-3-3-250001255-etched.step` / `2-3-3-250001255-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2-3-3-250001255.step` / `2-3-3-250001255.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MDH datasheet](docs/2-3-3-250001255-datasheet.pdf) (10 pp, sha256 `7eba92c88b6401b9`, 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/2-3-3-250001255-datasheet.pdf)