# ECS-120-10-36Q-ES-TR

**ECS** · Crystals · SMD2520-4P

ECS-120-10-36Q-ES-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 labeled In/Out in the Pad Connections table; pads 1 and 3 are interchangeable because the crystal is symmetrical. |
| 2 | Gnd | power_in | Ground pad listed as Gnd in the Pad Connections table; the datasheet gives no further electrical limits for this pad. |
| 3 | Out/In | passive | Crystal terminal labeled Out/In in the Pad Connections table; pads 1 and 3 are interchangeable because the crystal is symmetrical. |
| 4 | Gnd | power_in | Ground pad listed as Gnd in the Pad Connections table; the datasheet gives no further electrical limits for this pad. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ECS |
| Package | SMD2520-4P |
| Category | Crystals, Oscillators, Resonators |
| 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 |
|---|---|---|---|---|---|---|---|
| Equivalent Series Resistance (ESR) Max | ESR |  |  | 150 | Ω | 12.000 ~ 15.999 MHz (P/N frequency 12.000 MHz) | 1 |
| Frequency Tolerance |  | -30 |  | 30 | ppm | @ +25°C; Std tolerance (no tolerance letter in P/N) | 1 |
| Frequency Stability (ES Option) |  | -50 |  | 50 | ppm | -40 ~ +125°C, ES option | 1 |
| Aging (First Year) |  | -5 |  | 5 | ppm | @ +25°C ±3°C, first year | 1 |
| Drive Level | DL | 10 |  | 100 | μW |  | 1 |
| Operating Temperature (ES Option) | Topr | -40 |  | 125 | °C | ES option | 1 |
| Storage Temperature | Tstg | -40 |  | 125 | °C |  | 1 |
| Nominal Frequency |  |  | 12 |  | MHz | P/N code 120 = 12.000 MHz | 1 |
| Shunt Capacitance | Co |  | 5 |  | pF |  | 1 |
| Load Capacitance |  |  | 10 |  | pF | Specified in P/N (10 pF in ECS-120-10-36Q-ES-TR) | 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-120-10-36Q-ES-TR`
- Footprint: `Crystal:Crystal_SMD_2520-4Pin_2.5x2.0mm`
- 3D model: SMD2520-4P (KiCad packages3D, STEP)
- 3D model files: `ecs-120-10-36q-es-tr-etched.step` / `ecs-120-10-36q-es-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-120-10-36q-es-tr.step` / `ecs-120-10-36q-es-tr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ECS datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589814545268314112) (2 pp, sha256 `c6bcaee0f709773f`, retrieved 2026-10-16, 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-120-10-36q-es-tr-datasheet.pdf)