# ECS-76.8-18-5PXEN-TR

**ECS** · Crystals · HC-49S-SMD

ECS-76.8-18-5PXEN-TR from ECS, in a HC-49S-SMD. 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 | 1 | passive | Terminal 1 of a two-terminal crystal; either orientation. |
| 2 | 2 | passive | Terminal 2 of a two-terminal crystal; either orientation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ECS |
| Package | HC-49S-SMD |
| Category | Crystals, Oscillators, Resonators |
| Pins | 2 |

## 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 |  | -30 |  | 30 | ppm | @ +25°C | 1 |
| Frequency stability (decoded from P/N tolerance code E) |  | -50 |  | 50 | ppm | P/N stability code E (±50 ppm); P/N temp code N (-40 ~ +85°C) | 1 |
| Aging (first year) |  | -5 |  | 5 | ppm | First year, @ +25°C ±3°C | 1 |
| Shunt capacitance | Co |  |  | 7 | pF |  | 1 |
| Drive level | DL |  |  | 500 | μW |  | 1 |
| Storage temperature | Tstg | -55 |  | 125 | °C |  | 1 |
| Peak solder temperature |  |  |  | 260 | °C | Peak solder, max 10 sec, 2 cycles max | 2 |

## CAD (KiCad official)

- Symbol: `ECS-76.8-18-5PXEN-TR`
- Footprint: `Crystal:Crystal_SMD_HC49-SD`
- 3D model: HC-49S-SMD (KiCad packages3D, STEP)
- 3D model files: `ecs-76-8-18-5pxen-tr-etched.step` / `ecs-76-8-18-5pxen-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-76-8-18-5pxen-tr.step` / `ecs-76-8-18-5pxen-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/8589839881045647360) (2 pp, sha256 ``, retrieved 2026-10-15, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `crystal numbering` (convention), consensus `off` (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-76-8-18-5pxen-tr-datasheet.pdf)