# ECS-120-10-36B2-CWY-TR

**ECS** · Crystals · SMD2520-4P

ECS-120-10-36B2-CWY-TR from ECS, in a SMD2520-4P. 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 (In/Out) of the symmetrical crystal; pins 1 and 3 are interchangeable. |
| 2 | Gnd | power_in | Ground pad, to be connected to circuit ground. |
| 3 | Out/In | passive | Crystal terminal (Out/In) of the symmetrical crystal; interchangeable with pin 1. |
| 4 | Gnd | power_in | Ground pad, to be connected to circuit ground. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ECS |
| Package | SMD2520-4P |
| 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 |
|---|---|---|---|---|---|---|---|
| Frequency tolerance @ +25°C (code C = ±10 ppm) |  | -10 |  | 10 | ppm | @ +25°C, C option | 1 |
| Frequency stability (code W = ±15 ppm per part-numbering guide) |  | -15 |  | 15 | ppm | Stability code W from part-numbering guide; electrical table stability row is for KY option (±10 ppm), not this variant | 1 |
| Aging (first year) |  | -2 |  | 2 | ppm | First year @ +25°C ±3°C | 1 |
| Equivalent series resistance (ESR) | ESR |  |  | 130 | Ω | Frequency 12.000 ~ 15.999 MHz | 1 |
| Operating temperature (Y option) | Topr | -30 |  | 85 | °C | Y option | 1 |
| Shunt capacitance | Co |  |  | 3 | pF |  | 1 |
| Drive level | DL |  |  | 100 | μW |  | 1 |
| Storage temperature | Tstg | -55 |  | 125 | °C |  | 1 |
| Peak solder temperature |  |  |  | 260 | °C | Max 10 sec, 2 cycles max | 2 |
| Nominal frequency |  |  | 12 |  | MHz | Frequency code 120 = 12.000 MHz per part-numbering guide | 1 |
| Load capacitance | CL |  | 10 |  | pF | Load capacitance code 10 = 10 pF per part-numbering guide | 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-120-10-36B2-CWY-TR`
- Footprint: `Crystal:Crystal_SMD_2520-4Pin_2.5x2.0mm`
- 3D model: SMD2520-4P (KiCad packages3D, STEP)
- 3D model files: `ecs-120-10-36b2-cwy-tr-etched.step` / `ecs-120-10-36b2-cwy-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-120-10-36b2-cwy-tr.step` / `ecs-120-10-36b2-cwy-tr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ECS datasheet](docs/ecs-120-10-36b2-cwy-tr-datasheet.pdf) (2 pp, sha256 `de0ae185b029dac4`, 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-120-10-36b2-cwy-tr-datasheet.pdf)