# ECS-250-18-33Q-DS

**ECS** · Crystals · SMD3225-4P

ECS-250-18-33Q-DS 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; pads 1 and 3 are interchangeable because the crystal is symmetrical, so either can be the input or output. |
| 2 | Gnd | power_in | Ground pad connected to the crystal case/ground, which the datasheet lists as Gnd. |
| 3 | Out/In | passive | Crystal terminal; pads 3 and 1 are interchangeable because the crystal is symmetrical, so either can be the output or input. |
| 4 | Gnd | power_in | Ground pad connected to the crystal case/ground, which the datasheet lists as Gnd. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ECS |
| Package | SMD3225-4P |
| Category | Crystals, Oscillators, Resonators |
| Pins | 4 |

## CAD (KiCad official)

- Symbol: `ECS-250-18-33Q-DS`
- Footprint: `Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm`
- 3D model: SMD3225-4P (KiCad packages3D, STEP)
- 3D model files: `ecs-250-18-33q-ds-etched.step` / `ecs-250-18-33q-ds-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-250-18-33q-ds.step` / `ecs-250-18-33q-ds.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/8589814546693971968) (2 pp, sha256 `b583681324b12bf9`, retrieved 2026-10-13, 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-250-18-33q-ds-datasheet.pdf)