# 49D025000CQ

**huaxindianzi** · Crystals · HC-49S-SMD

49D025000CQ from huaxindianzi, in a HC-49S-SMD. 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 | Terminal 1 of a two-terminal crystal; either orientation. |
| 2 | 2 | passive | Terminal 2 of a two-terminal crystal; either orientation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | huaxindianzi |
| Package | HC-49S-SMD |
| Category | Crystals, Oscillators, Resonators |
| Pins | 2 |

## 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 |  | -20 |  | 20 | ppm | At 25℃±℃ | 4 |
| Temperature frequency deviation (item 5, labelled 'Equivalent Series Resistance' in English text) |  | -30 |  | 30 | ppm |  | 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 | -1000ppm～6500ppm | 4 |
| Aging rate |  | -2 |  | 2 | ppm | First year | 4 |
| Operating temperature | TC | -40 |  | 85 | ℃ |  | 4 |
| Storage temperature range |  | -55 |  | 125 | ℃ |  | 4 |
| Drive level | DL |  | 400 |  | μW |  | 4 |
| Load capacitance | CL |  | 20 |  | pF |  | 4 |
| Nominal frequency | F0 |  | 25 |  | MHz |  | 4 |

## CAD (KiCad official)

- Symbol: `49D025000CQ`
- Footprint: `Crystal:Crystal_SMD_HC49-SD`
- 3D model: HC-49S-SMD (KiCad packages3D, STEP)
- 3D model files: `49d025000cq-etched.step` / `49d025000cq-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `49d025000cq.step` / `49d025000cq.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [huaxindianzi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590931284275511296) (10 pp, sha256 ``, retrieved 2026-10-14, 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`, primary `crystal numbering` (convention), consensus `off` (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/49d025000cq-datasheet.pdf)