# ECS-240-8-37-CKM-TR3

**ECS** · Crystals · SMD2016-4P

ECS-240-8-37-CKM-TR3 from ECS, in a SMD2016-4P. 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) that is electrically interchangeable with pad 3; the datasheet states the crystal is symmetrical and pads 1 and 3 can be swapped. |
| 2 | Gnd | power_in | Ground pad connection as listed in the datasheet pad connections table; the datasheet gives no further electrical limits for this pad. |
| 3 | Out/In | passive | Crystal terminal (Out/In) that is electrically interchangeable with pad 1; the chamfer on the bottom pad has no electrical significance. |
| 4 | Gnd | power_in | Ground pad connection as listed in the datasheet pad connections table; the datasheet gives no further electrical limits for this pad. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ECS |
| Package | SMD2016-4P |
| 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 Tolerance (MPN tolerance code C = ±10 ppm) |  | -10 |  | 10 | ppm | @ +25°C; tolerance letter C per part-numbering guide | 1 |
| Frequency Stability (MPN stability code K = ±10 ppm) |  | -10 |  | 10 | ppm | -20 ~ +70°C; stability letter K per part-numbering guide (marked † contact ECS for availability) | 1 |
| Frequency range |  | 16 |  | 80 | MHz | Family range printed as '16.000 80.000' | 1 |
| Operating Temperature | Topr | -20 |  | 70 | °C | Temp range code M = -20 ~ +70°C per part-numbering guide | 1 |
| Storage Temperature | Tstg | -40 |  | 85 | °C |  | 1 |
| Aging (First Year) |  | -5 |  | 5 | ppm | @ +25°C ±3°C | 1 |
| ESR (Equivalent Series Resistance) | ESR |  |  | 80 | Ω | Frequency band 24.000 ~ 25.999 MHz (applies to 24.000 MHz) | 1 |
| Shunt Capacitance | Co |  |  | 5 | pF |  | 1 |
| Drive Level | DL |  |  | 100 | μW |  | 1 |
| Peak solder temperature |  |  |  | 260 | °C | Max 10 sec; 2 cycles max; MSL 1, Lead finish Au | 2 |
| Nominal frequency (from P/N) |  |  | 24 |  | MHz | Decoded from P/N '240 = 24.000 MHz' | 1 |
| Load Capacitance (from P/N) |  |  | 8 |  | pF | Decoded from P/N '8 = 8 pF'; datasheet says 'Specify in P/N' | 1 |

## CAD (KiCad official)

- Symbol: `ECS-240-8-37-CKM-TR3`
- Footprint: `Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm`
- 3D model: SMD2016-4P (KiCad packages3D, STEP)
- 3D model files: `ecs-240-8-37-ckm-tr3-etched.step` / `ecs-240-8-37-ckm-tr3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-240-8-37-ckm-tr3.step` / `ecs-240-8-37-ckm-tr3.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/8590905884598226944) (2 pp, sha256 `1fdd3d68782fd6d0`, 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-240-8-37-ckm-tr3-datasheet.pdf)