# ECS-320-8-37B2-CKM-TR

**ECS** · Crystals · SMD2016-4P

ECS-320-8-37B2-CKM-TR 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); the crystal is symmetrical and pads 1 and 3 are interchangeable, so either orientation is electrically valid. |
| 2 | Gnd | power_in | Ground pad connected to Gnd per the datasheet pad connection table; no additional electrical limits are stated. |
| 3 | Out/In | passive | Crystal terminal (Out/In); the crystal is symmetrical and pads 1 and 3 are interchangeable, so either orientation is electrically valid. |
| 4 | Gnd | power_in | Ground pad connected to Gnd per the datasheet pad connection table; no additional electrical limits are stated. |

## 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 (C option, decoded from P/N) |  | -10 |  | 10 | ppm | @ +25°C | 1 |
| Frequency Stability (K option, decoded from P/N; M temp range) |  | -10 |  | 10 | ppm | K option; -20 ~ +70°C (M option per P/N guide) | 1 |
| Aging (First Year) |  | -2 |  | 2 | ppm | @ +25°C ±3°C, first year | 1 |
| ESR |  |  |  | 50 | Ω | Frequency 24.000 ~ 39.999 MHz | 1 |
| Storage Temperature | Tstg | -55 |  | 125 | °C |  | 1 |
| Operating Temperature (M option, decoded from P/N) | Topr | -20 |  | 70 | °C | M option -20 ~ +70°C per P/N guide; printed Topr row is Y option (-30 ~ +85°C), not this part | 1 |
| Peak Solder Temperature |  |  |  | 260 | °C | 10 sec max; 2 cycles max | 2 |
| Load Capacitance |  |  | 8 |  | pF | Specify in P/N (8 = 8 pF) | 1 |
| Shunt Capacitance | Co |  | 3 |  | pF |  | 1 |
| Drive Level | DL |  | 100 |  | μW |  | 1 |

## CAD (KiCad official)

- Symbol: `ECS-320-8-37B2-CKM-TR`
- Footprint: `Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm`
- 3D model: SMD2016-4P (KiCad packages3D, STEP)
- 3D model files: `ecs-320-8-37b2-ckm-tr-etched.step` / `ecs-320-8-37b2-ckm-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-320-8-37b2-ckm-tr.step` / `ecs-320-8-37b2-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/8600492810407854080) (2 pp, sha256 `295c7caddb585618`, retrieved 2026-10-15, 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-320-8-37b2-ckm-tr-datasheet.pdf)