# ECS-320-8-37B-7KM-TR

**ECS** · Pre-ordered Products · SMD2016-4P

ECS-320-8-37B-7KM-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) on pad 1; datasheet states pads 1 and 3 are interchangeable and the crystal is symmetrical. |
| 2 | Gnd | power_in | Ground pad (Gnd); datasheet pad connection table lists this pad as ground with no further electrical limits stated. |
| 3 | Out/In | passive | Crystal terminal (Out/In) on pad 3; datasheet states pads 1 and 3 are interchangeable and the chamfer on the bottom pad has no electrical significance. |
| 4 | Gnd | power_in | Ground pad (Gnd); datasheet pad connection table lists this pad as ground with no further electrical limits stated. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ECS |
| Package | SMD2016-4P |
| 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 @ +25°C (P/N code 7 = ±7 ppm) |  | -7 |  | 7 | ppm | @ +25°C; P/N tolerance code 7 | 1 |
| Frequency stability (P/N code K = ±10 ppm) |  | -10 |  | 10 | ppm | K option per P/N guide; datasheet stability row prints KY option over -30 ~ +85°C | 1 |
| Operating temperature (P/N code M) | Topr | -20 |  | 70 | °C | M option per P/N guide (-20 ~ +70°C); datasheet Topr row prints Y option -30 ~ +85°C | 1 |
| Storage temperature | Tstg | -55 |  | 125 | °C |  | 1 |
| Equivalent series resistance (ESR) | ESR |  |  | 50 | Ω | Frequency range 24.000 ~ 39.999 MHz (applies to 32 MHz P/N) | 1 |
| Frequency range |  | 16 |  | 96 | MHz | Family frequency range (ECX-1637B) | 1 |
| Shunt capacitance | Co |  | 3 |  | pF |  | 1 |
| Load capacitance |  |  | 8 |  | pF | Specify in P/N; 8 pF for this P/N | 1 |
| Drive level | DL |  | 100 |  | μW |  | 1 |
| Aging (first year) |  | -1 |  | 1 | ppm | @ +25°C ±3°C, first year | 1 |
| Peak solder temperature |  |  |  | 260 | °C | Reflow profile; 2 cycles max | 2 |
| Time at peak solder temperature |  |  |  | 10 | sec | At peak solder temp +260°C | 2 |

## 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-320-8-37B-7KM-TR`
- Footprint: `Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm`
- 3D model: SMD2016-4P (KiCad packages3D, STEP)
- 3D model files: `ecs-320-8-37b-7km-tr-etched.step` / `ecs-320-8-37b-7km-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-320-8-37b-7km-tr.step` / `ecs-320-8-37b-7km-tr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ECS datasheet](docs/ecs-320-8-37b-7km-tr-datasheet.pdf) (2 pp, sha256 `c3676bf496b29153`, 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-320-8-37b-7km-tr-datasheet.pdf)