# ECS-240-10-37B2-CWN-TR

**ECS** · Crystals · SMD2016-4P

ECS-240-10-37B2-CWN-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 | Pad 1 is one crystal terminal and is interchangeable with pad 3 because the crystal is symmetrical. |
| 2 | Gnd | power_in | Pad 2 is a ground connection as listed in the datasheet pad connections table. |
| 3 | Out/In | passive | Pad 3 is the other crystal terminal and is interchangeable with pad 1 because the crystal is symmetrical. |
| 4 | Gnd | power_in | Pad 4 is a ground connection as listed in the datasheet pad connections table. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ECS |
| Package | SMD2016-4P |
| Category | Resonators/Oscillators |
| 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 |
|---|---|---|---|---|---|---|---|
| Nominal frequency (part-numbering code 240) |  |  | 24 |  | MHz | Part numbering: 240 = 24.000 MHz | 1 |
| Load capacitance | CL |  | 10 |  | pF | Part numbering code 10 = 10 pF | 1 |
| Frequency range |  | 16 |  | 50 | MHz | Frequency range of the ECX-1637B2 series | 1 |
| Frequency tolerance |  | -10 |  | 10 | ppm | @ +25°C, C option (part-numbering tolerance letter C) | 1 |
| Frequency stability |  | -15 |  | 15 | ppm | Stability option W per part-numbering guide | 1 |
| Aging (first year) |  | -2 |  | 2 | ppm | First year @ +25°C ±3°C | 1 |
| Equivalent series resistance (ESR) | ESR |  |  | 50 | Ω | Frequency 24.000 ~ 39.999 MHz | 1 |
| Storage temperature | Tstg | -55 |  | 125 | °C |  | 1 |
| Peak solder temperature |  |  |  | 260 | °C | Max 10 sec, 2 cycles max | 2 |

## 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-240-10-37B2-CWN-TR`
- Footprint: `Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm`
- 3D model: SMD2016-4P (KiCad packages3D, STEP)
- 3D model files: `ecs-240-10-37b2-cwn-tr-etched.step` / `ecs-240-10-37b2-cwn-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-240-10-37b2-cwn-tr.step` / `ecs-240-10-37b2-cwn-tr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ECS datasheet](docs/ecs-240-10-37b2-cwn-tr-datasheet.pdf) (2 pp, sha256 `295c7caddb585618`, retrieved 2026-11-02, 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-240-10-37b2-cwn-tr-datasheet.pdf)