# ECS-240-12-37BQ-CKY-TR

**ECS** · Crystals · SMD2016-4P

ECS-240-12-37BQ-CKY-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 is electrically interchangeable with pad 3 because the crystal is symmetrical. |
| 2 | Gnd | power_in | Ground pad tied to the crystal case per the datasheet pad connections table. |
| 3 | Out/In | passive | Crystal terminal that is electrically interchangeable with pad 1 because the crystal is symmetrical. |
| 4 | Gnd | power_in | Ground pad tied to the crystal case per the datasheet pad connections table. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ECS |
| Package | SMD2016-4P |
| Category | Crystal Oscillator/Oscillator/Resonator |
| 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 @ +25°C (C option) |  | -10 |  | 10 | ppm | @ +25°C | 1 |
| Frequency Stability (K option) |  | -10 |  | 10 | ppm | -30 ~ +85°C | 1 |
| Aging (First Year) |  | -1 |  | 1 | ppm | @ +25°C±3°C | 1 |
| Equivalent Series Resistance | ESR |  |  | 50 | Ω | 24.000 ~ 39.999 MHz | 1 |
| Shunt Capacitance | Co |  |  | 3 | pF |  | 1 |
| Drive Level | DL |  |  | 200 | μW |  | 1 |
| Operating Temperature (Y option) | Topr | -30 |  | 85 | °C |  | 1 |
| Storage Temperature | Tstg | -55 |  | 125 | °C |  | 1 |
| Peak Solder Temperature |  |  |  | 260 | °C | 10 sec Max., 2 cycles max | 2 |
| Frequency Range |  | 16 |  | 50 | MHz | ECX-1637BQ series range | 1 |
| Nominal Frequency |  |  | 24 |  | MHz | 240 = 24.000 MHz per P/N | 1 |

## 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-240-12-37BQ-CKY-TR`
- Footprint: `Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm`
- 3D model: SMD2016-4P (KiCad packages3D, STEP)
- 3D model files: `ecs-240-12-37bq-cky-tr-etched.step` / `ecs-240-12-37bq-cky-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-240-12-37bq-cky-tr.step` / `ecs-240-12-37bq-cky-tr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ECS datasheet](docs/ecs-240-12-37bq-cky-tr-datasheet.pdf) (2 pp, sha256 `81c4fae85ec721aa`, retrieved 2026-10-31, 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-240-12-37bq-cky-tr-datasheet.pdf)