component
ECS-250-18-4X-CKM
Public Made by Adomby adom
ECS Crystals, HC-49S. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownECS-250-18-4X-CKM
ECS · Crystals · HC-49S
ECS-250-18-4X-CKM from ECS, in a HC-49S. 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 |
| Category | Crystal Oscillator/Oscillator/Resonator |
| 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 | -10 | 10 | ppm | @ +25°C, option C | 1 | ||
| Frequency Stability | -10 | 10 | ppm | -20 ~ +70°C, option K | 1 | ||
| Operating Temperature | Topr | -20 | 70 | °C | option M | 1 | |
| Storage Temperature | Tstg | -55 | 125 | °C | 1 | ||
| Drive Level | DL | 500 | μW | 1 | |||
| Shunt Capacitance | Co | 7 | pF | 1 | |||
| Equivalent Series Resistance | ESR | 30 | Ω | 20.000 ~ 30.000 MHz, Fundamental | 1 | ||
| Aging (First Year) | -5 | 5 | ppm | @ +25°C ±3°C | 1 | ||
| Frequency | Fo | 25 | MHz | 250 = 25.000 MHz | 1 | ||
| Load Capacitance | 18 | pF | 18 = 18 pF specified in P/N | 1 | |||
| Peak Solder Temperature | 260 | °C | 10 sec max, 2 cycles max | 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 | tin | MSL 1, Lead Finish Sn/Cu Matte HC-49USX | 2 |
CAD (KiCad official)
- Symbol:
ECS-250-18-4X-CKM - Footprint:
Crystal:Crystal_HC49-4H_Vertical - 3D model: HC-49S (KiCad packages3D, STEP)
- 3D model files:
ecs-250-18-4x-ckm-etched.step/ecs-250-18-4x-ckm-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ecs-250-18-4x-ckm.step/ecs-250-18-4x-ckm.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: ECS datasheet (2 pp, sha256 ``, retrieved 2026-10-23, tier: lcsc)
- Extractor: parts-factory
2.0.0/extract_pins, primarycrystal numbering(convention), consensusoff(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).