# Q24FA20H00428

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

Q24FA20H00428 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 | Pin #1 is one of the two crystal terminals in the internal connection diagram; the datasheet does not name its function or state electrical limits for it. |
| 2 | #2 | power_in | Pin #2 is connected to the case and the datasheet instructs that it be grounded (请接地). |
| 3 | #3 | passive | Pin #3 is the other crystal terminal in the internal connection diagram; the datasheet does not name its function or state electrical limits for it. |
| 4 | #4 | power_in | Pin #4 is connected to the case and the datasheet instructs that it be grounded (请接地). |

## 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 (variant ±10 ×10^-6) | f_tol | -10 |  | 10 | x10^-6 | +25 C; 10 variant of the printed pair | 1 |
| Frequency tolerance (variant ±30 ×10^-6) | f_tol | -30 |  | 30 | x10^-6 | +25 C; 30 variant of the printed pair | 1 |
| Frequency-temperature characteristic (variant ±10 ×10^-6) | f_tem | -10 |  | 10 | x10^-6 | -20 C to +75 C; 10 variant of the printed pair | 1 |
| Frequency-temperature characteristic (variant ±30 ×10^-6) | f_tem | -30 |  | 30 | x10^-6 | -20 C to +75 C; 30 variant of the printed pair | 1 |
| Frequency aging | f_age |  |  | 3 | x10^-6/year | +25 C, first year | 1 |
| Series resistance ESR, 12.0 MHz ≤ f_nom < 16.0 MHz | R1 |  |  | 150 | Ω | Band 12.0 MHz ≤ f_nom < 16.0 MHz; -20 C to +75 C | 1 |
| Series resistance ESR, 16.0 MHz ≤ f_nom ≤ 25.0 MHz | R1 |  |  | 80 | Ω | Band 16.0 MHz ≤ f_nom ≤ 25.0 MHz; -20 C to +75 C | 1 |
| Series resistance ESR, 25.0 MHz < f_nom ≤ 30.0 MHz | R1 |  |  | 60 | Ω | Band 25.0 MHz < f_nom ≤ 30.0 MHz; -20 C to +75 C | 1 |
| Series resistance ESR, 30.0 MHz < f_nom ≤ 35.0 MHz | R1 |  |  | 50 | Ω | Band 30.0 MHz < f_nom ≤ 35.0 MHz; -20 C to +75 C | 1 |
| Series resistance ESR, 35.0 MHz < f_nom ≤ 54.0 MHz | R1 |  |  | 40 | Ω | Band 35.0 MHz < f_nom ≤ 54.0 MHz; -20 C to +75 C | 1 |
| Excitation (drive) power, first printed value | DL |  |  | 100 | W | Not stated in datasheet text; first of two printed Max. values | 1 |
| Excitation (drive) power, second printed value | DL |  |  | 200 | W | Not stated in datasheet text; second of two printed Max. values | 1 |
| Recommended excitation power | DL | 1 |  | 100 | W | Recommended range | 1 |
| Operating temperature range | T_use | -40 |  | 85 | °C |  | 1 |
| Storage temperature range (bare storage) | T_stg | -40 |  | 125 | °C | Bare storage (裸存) | 1 |
| Load capacitance | CL | 6 |  |  | pF | Specifiable; load-capacitance code for this MPN not decoded in datasheet text | 1 |
| Rated fundamental frequency range | f_nom | 12 |  | 54 | MHz | Fundamental mode; this MPN's frequency not decoded in datasheet text | 1 |

## CAD (KiCad official)

- Symbol: `Q24FA20H00428`
- Footprint: `Crystal:Crystal_SMD_2520-4Pin_2.5x2.0mm`
- 3D model: SMD2520-4P (KiCad packages3D, STEP)
- 3D model files: `q24fa20h00428-etched.step` / `q24fa20h00428-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `q24fa20h00428.step` / `q24fa20h00428.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Seiko Epson datasheet](docs/q24fa20h00428-datasheet.pdf) (2 pp, sha256 `7bb713f5fda96562`, 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-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/q24fa20h00428-datasheet.pdf)