# X1E0000210129

**Seiko Epson** · Crystals · SMD3225-4P

X1E0000210129 from Seiko Epson, 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 TSX-3225 (12-48 MHz range per 16.000-48.000 MHz nominal; load capacitance CL 7 pF to ∞, drive level 200 µW Max.). |
| 2 | GND | power_in | Connected internally to the metal case/lid; the datasheet says to connect it to ground. |
| 3 | XTAL2 | passive | Crystal terminal #3 of the TSX-3225, the second crystal terminal (ESR 60 Ω Max. for 16.0-21.0 MHz, 40 Ω Max. for 21.0-48.0 MHz). |
| 4 | GND | power_in | Connected internally to the metal case/lid; the datasheet says to connect it to ground. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Seiko Epson |
| 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 | f_tol | -10 |  | 10 | ×10-6 | +25 °C | 1 |
| Frequency-temperature characteristics | f_tem | -30 |  | 30 | ×10-6 | -20 °C ~ +70 °C | 1 |
| Load capacitance | CL | 7 |  |  | pF |  | 1 |
| Equivalent series resistance, 16.0 MHz ≤ f_nom < 21.0 MHz (TSX-3225) | R1 |  |  | 60 | Ω | -40 °C ~ +85 °C, DL = 100 µW; 16.0 MHz ≤ f_nom < 21.0 MHz | 1 |
| Equivalent series resistance, 21.0 MHz ≤ f_nom ≤ 48.0 MHz (TSX-3225) | R1 |  |  | 40 | Ω | -40 °C ~ +85 °C, DL = 100 µW; 21.0 MHz ≤ f_nom ≤ 48.0 MHz | 1 |
| Aging, first year | f_age | -5 |  | 5 | ×10-6/year | +25 °C, first year | 1 |
| Aging | f_age | -1 |  | 1 | ×10-6/year | +25 °C, first year (see footnote *2) | 1 |
| Drive level | DL |  |  | 200 | µW | Max.; recommended 1 µW ~ 100 µW | 1 |
| Storage temperature | T_stg | -40 |  | 125 | °C |  | 1 |
| Operating temperature | T_use | -40 |  | 85 | °C | (+105 °C per datasheet note; contact manufacturer above +85 °C) | 1 |

## CAD (KiCad official)

- Symbol: `X1E0000210129`
- Footprint: `Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm`
- 3D model: SMD3225-4P (KiCad packages3D, STEP)
- 3D model files: `x1e0000210129-etched.step` / `x1e0000210129-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `x1e0000210129.step` / `x1e0000210129.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Seiko Epson datasheet](docs/x1e0000210129-datasheet.pdf) (2 pp, sha256 `4e9c0baa33e30d2d`, 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/x1e0000210129-datasheet.pdf)