# 72012000RW1

**HD** · Crystals · HC-49S-SMD

72012000RW1 from HD, 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 | HD |
| 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 | Δf/f | -20 |  | 20 | ppm |  | 1 |
| Frequency Temperature Stability |  | -20 |  | 20 | ppm |  | 1 |
| Aging | ΔfA | -5 |  | 5 | ppm/Year |  | 1 |
| Shunt Capacitance | C0 |  |  | 7 | pF |  | 1 |
| Resonance Resistance |  |  |  | 40 | ohms |  | 1 |
| Insulation Resistance | IR | 500 |  |  | M ohms |  | 1 |
| Operating Temperature Range | TOPR | -20 |  | 70 | °C |  | 1 |
| Storage Temperature Range | TSTG | -55 |  | 125 | °C |  | 1 |
| Drop characteristics, frequency change |  | -5 |  | 5 | ppm | Free drop from 75cm on hard wooden board, 3 times; frequency change | 2 |
| Mechanical shock, frequency change |  | -5 |  | 5 | ppm | Half sine wave 1000g, three mutually perpendicular axes, 3 times each; frequency change | 2 |
| Shake characteristics, frequency change |  | -5 |  | 5 | ppm | Shake 10~55Hz, swing 1.5mm, x/y/z, 30 minutes, tested after 1 hour; frequency change | 2 |
| Humidity characteristics, frequency change |  | -5 |  | 5 | ppm | +40±2°C, 90%~95% R.H., 250 hours; frequency change | 2 |
| Low temperature characteristics, frequency change |  | -5 |  | 5 | ppm | -40±2°C, 250 hours, tested after 1 hour at room temperature; frequency change | 2 |
| High temperature characteristics, frequency change |  | -5 |  | 5 | ppm | +85±2°C, 250 hours, tested after 1 hour at room temperature; frequency change | 2 |
| Temperature cycling, frequency change |  | -5 |  | 5 | ppm | -30±3°C/30±3 min to +85±2°C/30±3 min, 5 cycles; frequency change | 2 |
| Reflow examination, frequency change |  | -5 |  | 5 | ppm | Reflow examination; frequency change | 2 |
| Nominal Frequency | f |  | 12 |  | Hz |  | 1 |
| Load Capacitance | CL |  | 20 |  | pF |  | 1 |
| Drive Level | DL |  | 100 |  | µW | typical | 1 |

## CAD (KiCad official)

- Symbol: `72012000RW1`
- Footprint: `Crystal:Crystal_SMD_HC49-SD`
- 3D model: HC-49S-SMD (KiCad packages3D, STEP)
- 3D model files: `72012000rw1-etched.step` / `72012000rw1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `72012000rw1.step` / `72012000rw1.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HD datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588905617579130880) (4 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/72012000rw1-datasheet.pdf)