# ECS-320-8-37CKM

**ECS** · Crystals · SMD2016-4P

ECS-320-8-37CKM 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 (labelled In/Out); pads 1 and 3 are interchangeable because the crystal is symmetrical, and the chamfer on the bottom pad has no electrical significance. |
| 2 | Gnd | power_in | Ground pad as given in the datasheet pad connection table (Gnd). |
| 3 | Out/In | passive | Crystal terminal (labelled Out/In); pads 1 and 3 are interchangeable because the crystal is symmetrical, and the chamfer on the bottom pad has no electrical significance. |
| 4 | Gnd | power_in | Ground pad as given in the datasheet pad connection table (Gnd). |

## 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 @ +25°C (decoded from P/N tolerance letter C = ±10 ppm) |  | -10 |  | 10 | ppm | @ +25°C, P/N tolerance code C | 1 |
| Frequency stability (decoded from P/N stability letter K = ±10 ppm) |  | -10 |  | 10 | ppm | -20 ~ +70°C, P/N stability code K | 1 |
| Aging (First Year) |  | -5 |  | 5 | ppm | @ +25°C ±3°C | 1 |
| Equivalent series resistance (ESR) | ESR |  |  | 60 | Ω | Frequency 26.000 ~ 39.999 MHz (applies to 32.000 MHz) | 1 |
| Operating temperature | Topr | -20 |  | 70 | °C | P/N temperature code M = -20 ~ +70°C | 1 |
| Storage temperature | Tstg | -40 |  | 85 | °C |  | 1 |
| Peak solder temperature |  |  |  | 260 | °C | Max 10 sec, 2 cycles max | 2 |
| Frequency range | f | 16 |  | 80 | MHz | Family range as printed; this P/N is 320 = 32.000 MHz | 1 |
| Nominal frequency (this P/N) | f |  | 32 |  | MHz | P/N frequency code 320 = 32.000 MHz | 2 |
| Load capacitance (this P/N) | CL |  | 8 |  | pF | P/N load code 8 = 8 pF | 1 |
| Shunt capacitance | Co |  | 5 |  | pF |  | 1 |
| Drive level | DL |  |  | 100 | μW |  | 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-320-8-37CKM`
- Footprint: `Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm`
- 3D model: SMD2016-4P (KiCad packages3D, STEP)
- 3D model files: `ecs-320-8-37ckm-etched.step` / `ecs-320-8-37ckm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-320-8-37ckm.step` / `ecs-320-8-37ckm.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ECS datasheet](docs/ecs-320-8-37ckm-datasheet.pdf) (2 pp, sha256 `1fdd3d68782fd6d0`, retrieved 2026-10-28, 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-320-8-37ckm-datasheet.pdf)