# ECS-240-18-33B-7KM-TR

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

ECS-240-18-33B-7KM-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 that is electrically interchangeable with pad 3; the datasheet gives no voltage or current limits for this pad. |
| 2 | Gnd | power_in | Ground pad for the crystal case, which the datasheet lists as Gnd without stating any electrical limits. |
| 3 | Out/In | passive | Crystal terminal that is electrically interchangeable with pad 1; the datasheet gives no voltage or current limits for this pad. |
| 4 | Gnd | power_in | Ground pad for the crystal case, which the datasheet lists as Gnd without stating any electrical limits. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ECS |
| Package | SMD3225-4P |
| Category | Electronic Tools/Instruments/Consumables |
| 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 (code 7) |  | -7 |  | 7 | ppm | @ +25°C; tolerance code 7 = ±7 ppm per P/N guide | 1 |
| Frequency stability (code K) |  | -10 |  | 10 | ppm | Over -20~+70°C (temp code M); stability code K = ±10 ppm per P/N guide | 1 |
| Equivalent series resistance (ESR) | ESR |  |  | 40 | Ω | Frequency 21.000 ~ 54.000 MHz range; this part is 24.000 MHz | 1 |
| Aging (first year) |  | -1 |  | 1 | ppm | First year @ +25°C ±3°C | 1 |
| Operating temperature (temp code M) | Topr | -20 |  | 70 | °C | Temperature range code M = -20 ~ +70°C per P/N guide | 1 |
| Storage temperature | Tstg | -40 |  | 125 | °C |  | 1 |
| Peak solder temperature |  |  |  | 260 | °C | 10 sec max; 2 cycles max; MSL 1, Lead finish Au | 2 |
| Shunt capacitance | Co |  | 3 |  | pF |  | 1 |
| Drive level | DL |  | 200 |  | μW |  | 1 |
| Nominal frequency |  |  | 24 |  | MHz | Fundamental mode; P/N code 240 = 24.000 MHz | 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-240-18-33B-7KM-TR`
- Footprint: `Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm`
- 3D model: SMD3225-4P (KiCad packages3D, STEP)
- 3D model files: `ecs-240-18-33b-7km-tr-etched.step` / `ecs-240-18-33b-7km-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-240-18-33b-7km-tr.step` / `ecs-240-18-33b-7km-tr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ECS datasheet](docs/ecs-240-18-33b-7km-tr-datasheet.pdf) (2 pp, sha256 `57501bd817a35b83`, 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-240-18-33b-7km-tr-datasheet.pdf)