# ECS-250-10-37BQ-CTN-TR

**ECS** · Crystals · SMD2016-4P

ECS-250-10-37BQ-CTN-TR from ECS, in a SMD2016-4P. 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 that may serve as input or output; the datasheet states pads 1 and 3 are interchangeable and the bottom-pad chamfer has no electrical significance. |
| 2 | Gnd | power_in | Ground pad connected to the crystal case; the datasheet gives no electrical limits for this pad. |
| 3 | Out/In | passive | Crystal terminal that may serve as output or input; the datasheet states pads 1 and 3 are interchangeable. |
| 4 | Gnd | power_in | Ground pad connected to the crystal case; the datasheet gives no electrical limits for this pad. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ECS |
| Package | SMD2016-4P |
| Category | Resonators/Oscillators |
| Pins | 4 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | gold | MSL 1, Lead Finish Au POCKET TAPE DIMENSIONS (mm) | 2 |

## CAD (KiCad official)

- Symbol: `ECS-250-10-37BQ-CTN-TR`
- Footprint: `Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm`
- 3D model: SMD2016-4P (KiCad packages3D, STEP)
- 3D model files: `ecs-250-10-37bq-ctn-tr-etched.step` / `ecs-250-10-37bq-ctn-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-250-10-37bq-ctn-tr.step` / `ecs-250-10-37bq-ctn-tr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ECS datasheet](docs/ecs-250-10-37bq-ctn-tr-datasheet.pdf) (2 pp, sha256 `81c4fae85ec721aa`, retrieved 2026-10-28, 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-250-10-37bq-ctn-tr-datasheet.pdf)