# FC4SDCBMM25.0-T1

**Fox** · Crystals · HC-49S-SMD

FC4SDCBMM25.0-T1 from Fox, 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 | Fox |
| 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 @ 25°C (option C) |  | -30 |  | 30 | ppm | @ 25°C | 1 |
| Frequency stability, ref 25°C, over operating temp range (option B) |  | -50 |  | 50 | ppm | Ref 25°C; over operating temp range -40°C to +85°C (option M) | 1 |
| Aging per year |  | -3 |  | 3 | ppm | @ 25°C | 1 |
| Shunt capacitance | CO |  |  | 7 | pF |  | 1 |
| Max ESR (fundamental) |  |  |  | 30 | Ω | Fundamental mode, >20.000 ~ 40.000 MHz | 1 |
| Drive level |  |  |  | 0.5 | mW |  | 1 |
| Operating temperature range (TOPR) | TOPR | -40 |  | 85 | °C | Option M = -40 to +85°C | 2 |
| Storage temperature range (TSTG) | TSTG | -55 |  | 125 | °C |  | 1 |
| Maximum soldering temperature |  |  |  | 260 | °C | 10 seconds x 2 | 1 |
| Frequency range |  | 3.2 |  | 80 | MHz |  | 1 |
| Nominal frequency |  |  | 25 |  | MHz | Frequency code 25.0 in MPN | 2 |
| Load capacitance | CL |  | 20 |  | pF | Load code M = 20pF | 2 |
| Drive level (typical) |  |  | 100 |  | µW | Typical | 1 |

## CAD (KiCad official)

- Symbol: `FC4SDCBMM25.0-T1`
- Footprint: `Crystal:Crystal_SMD_HC49-SD`
- 3D model: HC-49S-SMD (KiCad packages3D, STEP)
- 3D model files: `fc4sdcbmm25-0-t1-etched.step` / `fc4sdcbmm25-0-t1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fc4sdcbmm25-0-t1.step` / `fc4sdcbmm25-0-t1.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Fox datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8600793312466767872) (2 pp, sha256 ``, retrieved 2026-10-15, tier: lcsc)
- **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/fc4sdcbmm25-0-t1-datasheet.pdf)