# HY4M49SSSMDOB2R20

**Huiyuan crystal** · Crystals · HC-49S-SMD

HY4M49SSSMDOB2R20 from Huiyuan crystal, 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 | Huiyuan crystal |
| 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 |
|---|---|---|---|---|---|---|---|
| Effective Series Resistance (3.579545-4 MHz) |  |  |  | 120 | Ω | Frequency 3.579545-4 MHz | 1 |
| Effective Series Resistance (6-6.7458 MHz) |  |  |  | 80 | Ω | Frequency 6-6.7458 MHz | 1 |
| Effective Series Resistance (8 MHz) |  |  |  | 60 | Ω | Frequency 8 MHz | 1 |
| Effective Series Resistance (9.216-10 MHz) |  |  |  | 40 | Ω | Frequency 9.216-10 MHz | 1 |
| Effective Series Resistance (12-27 MHz) |  |  |  | 30 | Ω | Frequency 12-27 MHz | 1 |
| Frequency Tolerance |  | -20 |  | 20 | ppm | 25±3℃ | 1 |
| Stability Over Temperature Range |  | -20 |  | 20 | ppm | -20℃ to +70℃ | 1 |
| Aging |  | -3 |  | 3 | ppm/Year |  | 1 |
| Shunt Capacitance | C0 |  |  | 5 | pF |  | 1 |
| Insulation Resistance |  | 500 |  |  | MΩ | DC 100V | 1 |
| Operation Temperature Range |  | -40 |  | 85 | ℃ |  | 1 |
| Storage Temperature |  | -40 |  | 85 | ℃ |  | 1 |
| Typical Drive Level |  |  | 10 |  | uW |  | 1 |

## CAD (KiCad official)

- Symbol: `HY4M49SSSMDOB2R20`
- Footprint: `Crystal:Crystal_SMD_HC49-SD`
- 3D model: HC-49S-SMD (KiCad packages3D, STEP)
- 3D model files: `hy4m49sssmdob2r20-etched.step` / `hy4m49sssmdob2r20-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `hy4m49sssmdob2r20.step` / `hy4m49sssmdob2r20.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Huiyuan crystal datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603087428122910720) (3 pp, sha256 ``, retrieved 2026-10-15, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/hy4m49sssmdob2r20-datasheet.pdf)