# ECS-250-18-37B2-JTN-TR

**ECS INTERNATIONAL INC** · Global Sourcing Parts · SMD2016-4P

ECS-250-18-37B2-JTN-TR from ECS INTERNATIONAL INC, 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; the datasheet states the crystal is symmetrical and pads 1 and 3 are interchangeable. |
| 2 | Gnd | power_in | Ground pad as printed in the Pad Connections table; the datasheet gives no further electrical limit for this pad. |
| 3 | Out/In | passive | Crystal terminal; the datasheet states the crystal is symmetrical and pads 1 and 3 are interchangeable. |
| 4 | Gnd | power_in | Ground pad as printed in the Pad Connections table; the datasheet gives no further electrical limit for this pad. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ECS INTERNATIONAL INC |
| Package | SMD2016-4P |
| Category | Global Sourcing Parts |
| 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 at +25°C (J option, ±20 ppm) |  | -20 |  | 20 | ppm | @ +25°C; J = ±20 ppm per P/N guide | 1 |
| Frequency stability (T option, ±20 ppm) |  | -20 |  | 20 | ppm | -40 ~ +85°C; T = ±20 ppm per P/N guide | 1 |
| First-year aging |  | -2 |  | 2 | ppm | @ +25°C ±3°C, first year | 1 |
| Equivalent series resistance (ESR) | ESR |  |  | 50 | Ω | 24.000 ~ 39.999 MHz (MHz range applies to 25.000 MHz) | 1 |
| Operating temperature (N option) | Topr | -40 |  | 85 | °C | N = -40 ~ +85°C per P/N guide; datasheet Topr row is for Y option (-30 ~ +85) | 1 |
| Storage temperature | Tstg | -55 |  | 125 | °C |  | 1 |
| Frequency (nominal) |  |  | 25 |  | MHz | Code 250 in P/N = 25.000 MHz | 1 |
| Drive level | DL |  | 100 |  | μW |  | 1 |
| Shunt capacitance | Co |  | 3 |  | pF |  | 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-250-18-37B2-JTN-TR`
- Footprint: `Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm`
- 3D model: SMD2016-4P (KiCad packages3D, STEP)
- 3D model files: `ecs-250-18-37b2-jtn-tr-etched.step` / `ecs-250-18-37b2-jtn-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-250-18-37b2-jtn-tr.step` / `ecs-250-18-37b2-jtn-tr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ECS INTERNATIONAL INC datasheet](docs/ecs-250-18-37b2-jtn-tr-datasheet.pdf) (2 pp, sha256 `295c7caddb585618`, 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-250-18-37b2-jtn-tr-datasheet.pdf)