# ECS-120-20-33-TR

**ECS** · Pre-ordered Products · SMD3225-4P

ECS-120-20-33-TR from ECS, in a SMD3225-4P. 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; pads 1 and 3 are interchangeable because the crystal is symmetrical, and drive level is specified at 100 μW maximum. |
| 2 | Gnd | power_in | Ground connection for the crystal package, listed as Gnd in the pad connections table. |
| 3 | Out/In | passive | Crystal terminal labeled Out/In; pads 1 and 3 are interchangeable because the crystal is symmetrical, and drive level is specified at 100 μW maximum. |
| 4 | Gnd | power_in | Ground connection for the crystal package; the chamfer on the bottom may be on pad 4 or pad 1 and has no electrical significance. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ECS |
| Package | SMD3225-4P |
| Category | Solders / Accessories / Batteries |
| 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 range |  | 8 |  | 54 | MHz |  | 1 |
| Frequency tolerance |  | -50 |  | 50 | ppm | @ +25°C (Blank = Std tolerance, no tolerance letter in P/N) | 1 |
| Frequency stability |  | -50 |  | 50 | ppm | -20 ~ +70°C (Blank = Std stability, no stability letter in P/N) | 1 |
| Aging (first year) |  | -5 |  | 5 | ppm | First year @ +25°C ±3°C | 1 |
| Operating temperature | Topr | -20 |  | 70 | °C |  | 1 |
| Storage temperature | Tstg | -55 |  | 125 | °C |  | 1 |
| Load capacitance |  | 4 |  | 20 | pF | Specify in P/N; P/N code 20 = 20 pF | 1 |
| Drive level | DL |  |  | 100 | μW |  | 1 |
| Shunt capacitance | Co |  |  | 5 | pF |  | 1 |
| Equivalent series resistance (ESR) |  |  |  | 100 | Ω | Frequency 10.000 ~ 15.999 MHz (P/N code 120 = 12.000 MHz) | 1 |
| Nominal frequency |  |  | 12 |  | MHz | P/N code 120 = 12.000 MHz (Developed Frequencies table) | 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-120-20-33-TR`
- Footprint: `Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm`
- 3D model: SMD3225-4P (KiCad packages3D, STEP)
- 3D model files: `ecs-120-20-33-tr-etched.step` / `ecs-120-20-33-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-120-20-33-tr.step` / `ecs-120-20-33-tr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ECS datasheet](docs/ecs-120-20-33-tr-datasheet.pdf) (2 pp, sha256 `7f56a768dd3d4594`, retrieved 2026-10-30, 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-120-20-33-tr-datasheet.pdf)