# ECS-250-10-33B-CWN-TR

**ECS** · Crystals · SMD3225-4P

ECS-250-10-33B-CWN-TR from ECS, 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 | In/Out | passive | Crystal terminal labelled In/Out in the pad connection table; pads 1 and 3 are interchangeable because the crystal is symmetrical. |
| 2 | Gnd | power_in | Ground pad per the pad connection table; the chamfer on the bottom pad has no electrical significance. |
| 3 | Out/In | passive | Crystal terminal labelled Out/In in the pad connection table; pads 1 and 3 are interchangeable because the crystal is symmetrical. |
| 4 | Gnd | power_in | Ground pad per the pad connection table; the chamfer on the bottom pad has no electrical significance. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ECS |
| 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 range |  | 10 |  | 54 | MHz | Family range as printed; ECS-33B | 1 |
| Frequency tolerance |  | -10 |  | 10 | ppm | @ +25°C (P/N code C = ±10 ppm) | 1 |
| Frequency stability |  | -15 |  | 15 | ppm | -40 ~ +85°C (P/N code W = ±15 ppm; N = -40 ~ +85°C) | 1 |
| Aging (first year) |  | -1 |  | 1 | ppm | First year @ +25°C ±3°C | 1 |
| Equivalent series resistance (ESR) |  |  |  | 40 | Ω | 21.000 ~ 54.000 MHz | 1 |
| Operating temperature | Topr | -40 |  | 85 | °C |  | 1 |
| Storage temperature | Tstg | -40 |  | 125 | °C |  | 1 |
| Peak solder temperature |  |  |  | 260 | °C | 10 sec max; 2 cycles max | 2 |
| Nominal frequency |  |  | 25 |  | MHz | P/N abbreviation 250 = 25.000 MHz | 2 |
| Load capacitance |  |  | 10 |  | pF | P/N load capacitance code 10 (specified in P/N) | 1 |
| Shunt capacitance | Co |  | 3 |  | pF |  | 1 |
| Drive level | DL |  | 200 |  | μW |  | 1 |

## CAD (KiCad official)

- Symbol: `ECS-250-10-33B-CWN-TR`
- Footprint: `Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm`
- 3D model: SMD3225-4P (KiCad packages3D, STEP)
- 3D model files: `ecs-250-10-33b-cwn-tr-etched.step` / `ecs-250-10-33b-cwn-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-250-10-33b-cwn-tr.step` / `ecs-250-10-33b-cwn-tr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ECS datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589810362997366784) (2 pp, sha256 `57501bd817a35b83`, retrieved 2026-10-14, 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/ecs-250-10-33b-cwn-tr-datasheet.pdf)