# ECS-260-10-33B-CKM-TR

**ECS** · Crystals · SMD3225-4P

ECS-260-10-33B-CKM-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 (In/Out); pads 1 and 3 are electrically interchangeable, so either can serve as the input or output. |
| 2 | Gnd | power_in | Ground pad that must be connected to circuit ground. |
| 3 | Out/In | passive | Crystal terminal (Out/In); pads 1 and 3 are electrically interchangeable, so either can serve as the output or input. |
| 4 | Gnd | power_in | Ground pad that must be connected to circuit ground. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ECS |
| Package | SMD3225-4P |
| 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 |
|---|---|---|---|---|---|---|---|
| Frequency range |  | 10 |  | 54 | MHz | Family range as printed | 1 |
| Frequency tolerance |  | -10 |  | 10 | ppm | @ +25°C (code C) | 1 |
| Frequency stability |  | -10 |  | 10 | ppm | Stability code K per P/N guide | 1 |
| Aging (first year) |  | -1 |  | 1 | ppm | @ +25°C ±3°C, first year | 1 |
| Operating temperature | Topr | -20 |  | 70 | °C | Temp range code M (-20 ~ +70°C) per P/N guide | 1 |
| Storage temperature | Tstg | -40 |  | 125 | °C |  | 1 |
| Equivalent series resistance (ESR) | ESR |  |  | 40 | Ω | Frequency 21.000 ~ 54.000 MHz | 1 |
| Drive level | DL |  |  | 200 | μW |  | 1 |
| Peak solder temperature |  |  |  | 260 | °C | Max 10 sec; 2 cycles max | 2 |
| Nominal frequency |  |  | 26 |  | MHz | P/N code 260 = 26.000 MHz | 2 |
| Load capacitance | CL |  | 8 |  | pF | Specify in P/N; printed table value | 1 |
| Shunt capacitance | Co |  | 3 |  | pF |  | 1 |

## CAD (KiCad official)

- Symbol: `ECS-260-10-33B-CKM-TR`
- Footprint: `Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm`
- 3D model: SMD3225-4P (KiCad packages3D, STEP)
- 3D model files: `ecs-260-10-33b-ckm-tr-etched.step` / `ecs-260-10-33b-ckm-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-260-10-33b-ckm-tr.step` / `ecs-260-10-33b-ckm-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/8589812855698075648) (2 pp, sha256 `57501bd817a35b83`, retrieved 2026-10-14, 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-260-10-33b-ckm-tr-datasheet.pdf)