# Q24FA20H00478

**Seiko Epson** · Crystals · SMD2520-4P

Q24FA20H00478 from Seiko Epson, 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 | #1 | passive | Crystal terminal of the 32.000000 MHz fundamental resonator; the datasheet does not label it as X1 or X2 or give its electrical role. |
| 2 | #2 | power_in | Connected to the metal cover and specified to be connected to ground, per the datasheet note '#2 and #4 are connected to the cover (Please connect to ground)'. |
| 3 | #3 | passive | Crystal terminal of the 32.000000 MHz fundamental resonator; the datasheet does not label it as X1 or X2 or give its electrical role. |
| 4 | #4 | power_in | Connected to the metal cover and specified to be connected to ground, per the datasheet note '#2 and #4 are connected to the cover (Please connect to ground)'. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Seiko Epson |
| Package | SMD2520-4P |
| 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 | f_tol | -10 |  | 10 | x 10-6 | @+25ºC | 1 |
| Frequency stability over temperature | f_tem | -25 |  | 25 | x 10-6 | -40ºC to +85ºC | 1 |
| Operating temperature (specifications) | T_use | -40 |  | 85 | ºC |  | 1 |
| Level of drive | DL | 10 |  | 100 | µW |  | 1 |
| Motional resistance (ESR) | R1 |  |  | 50 | Ω |  | 1 |
| Frequency aging | f_age | -1 |  | 1 | x10-6 /yea | @+25ºC, First year | 1 |
| Storage temperature | T_stg | -40 |  | 125 | ºC | Storage as single product | 1 |
| Operating temperature (absolute maximum ratings) | T_use | -40 |  | 105 | ºC |  | 1 |
| Nominal frequency | f_nom |  | 32 |  | MHz | Fundamental | 1 |
| Load capacitance | CL |  | 12 |  | pF |  | 1 |
| Motional capacitance | C1 |  | 3.54 |  | fF |  | 1 |
| Motional inductance | L1 |  | 6.99 |  | mH |  | 1 |
| Shunt capacitance | C0 |  | 1.18 |  | pF |  | 1 |

## CAD (KiCad official)

- Symbol: `Q24FA20H00478`
- Footprint: `Crystal:Crystal_SMD_2520-4Pin_2.5x2.0mm`
- 3D model: SMD2520-4P (KiCad packages3D, STEP)
- 3D model files: `q24fa20h00478-etched.step` / `q24fa20h00478-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `q24fa20h00478.step` / `q24fa20h00478.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Seiko Epson datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588910671076970496) (3 pp, sha256 `545bed24df3fd8d3`, retrieved 2026-10-15, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/q24fa20h00478-datasheet.pdf)