# HY40685M49SOB2T02

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

HY40685M49SOB2T02 from Huiyuan crystal, 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 | Huiyuan crystal |
| Package | HC-49S |
| 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 |
|---|---|---|---|---|---|---|---|
| Normal frequency range |  | 3.57954 |  | 39.55 | MHz | Series range (HC49S-2DIP); this MPN's frequency not decodable | 1 |
| Load capacitance (CL) | CL | 6 |  | 44 | pF | Series range; this MPN's load-capacitance code not decodable | 1 |
| Frequency tolerance at 25±3℃ |  | -20 |  | 20 | ppm | 25±3℃ | 1 |
| Stability over temperature range |  | -30 |  | 30 | ppm | Over operating temperature range | 1 |
| Aging |  | -3 |  | 3 | PPM/Year |  | 1 |
| Effective series resistance (ESR) |  |  |  | 120 | Ω | Frequency 3.579545~4.9152MHZ | 1 |
| Effective series resistance (ESR) |  |  |  | 80 | Ω | Frequency 5~6.7458MHA | 1 |
| Effective series resistance (ESR) |  |  |  | 60 | Ω | Frequency 7.2~8.704MHA | 1 |
| Effective series resistance (ESR) |  |  |  | 40 | Ω | Frequency 9.216~11.529475MHA | 1 |
| Effective series resistance (ESR) |  |  |  | 30 | Ω | Frequency 12~39.550MHA | 1 |
| Shunt capacitance | C0 |  |  | 5 | PF |  | 1 |
| Insulation resistance |  | 500 |  |  | MΩ | at DC 100V | 1 |
| Operating temperature range |  | -40 |  | 85 | ℃ |  | 1 |
| Storage temperature |  | -40 |  | 85 | ℃ |  | 1 |
| Typical drive level |  |  | 100 |  | uW | TYP. | 1 |

## CAD (KiCad official)

- Symbol: `HY40685M49SOB2T02`
- Footprint: `Crystal:Crystal_HC49-4H_Vertical`
- 3D model: HC-49S (KiCad packages3D, STEP)
- 3D model files: `hy40685m49sob2t02-etched.step` / `hy40685m49sob2t02-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `hy40685m49sob2t02.step` / `hy40685m49sob2t02.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/8757322462969106432) (2 pp, sha256 ``, retrieved 2026-10-14, 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/hy40685m49sob2t02-datasheet.pdf)