# X2C037400BG1HA-U

**HELE(Harmony Elec)** · Crystals · SMD2016-4P

X2C037400BG1HA-U from HELE(Harmony Elec), in a SMD2016-4P. 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 | Crystal | passive | Crystal terminal for the 37.400000 MHz fundamental-mode crystal (16.0 pF load capacitance). |
| 2 | GND/Lid | power_in | Ground terminal connected internally to the metal lid (cover). |
| 3 | Crystal | passive | Second crystal terminal for the 37.400000 MHz fundamental-mode crystal (16.0 pF load capacitance). |
| 4 | GND/Lid | power_in | Ground terminal connected internally to the metal lid (cover). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HELE(Harmony Elec) |
| Package | SMD2016-4P |
| Category | Crystal Oscillator/Oscillator/Resonator |
| Pins | 4 |

## 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 | at 25℃±3℃ | 4 |
| Temperature stability |  | -20 |  | 20 | ppm | -40~ +85℃ | 4 |
| Aging |  | -3 |  | 3 | ppm/Year |  | 4 |
| Equivalent resistance (RR) | RR |  |  | 80 | Ω | SERIES | 4 |
| Storage temperature range |  | -40 |  | 85 | ℃ |  | 4 |
| Operable temperature range |  | -40 |  | 85 | ℃ |  | 4 |
| Drive level (DL) | DL | 10 |  | 200 | μW |  | 4 |
| Insulation resistance |  | 500 |  |  | MΩ | at DC 100V | 4 |
| Frequency drift, spec code A (env./mechanical tests) |  | -5 |  | 5 | ppm | Spec code A test group (see PAGE 9-10 tables) | 10 |
| Resistance drift, spec code A |  | -15 |  | 15 | % | Spec code A test group (see PAGE 9-10 tables) | 10 |
| Resistance drift, spec code A (alternative limit) |  | -2 |  | 2 | Ω | Spec code A test group; printed as 'or 2Ω' alternative to ±15% | 10 |
| Frequency drift, spec code C (adhesion, body strength) |  | -15 |  | 15 | ppm | Spec code C test group (see PAGE 9-10 tables) | 10 |
| Resistance drift, spec code C |  | -25 |  | 25 | % | Spec code C test group (see PAGE 9-10 tables) | 10 |
| Resistance drift, spec code C (alternative limit) |  | -10 |  | 10 | Ω | Spec code C test group; printed as 'or 10Ω' alternative to ±25% | 10 |
| Frequency (FL) | FL |  | 37.4 |  | MHz |  | 4 |
| Loading capacitance (CL) | CL |  | 16 |  | pF |  | 4 |
| Shunt capacitance (C0) | C0 |  | 2 |  | pF |  | 4 |
| Preheat temperature |  | 160 |  | 180 | ℃ | Preheat, 120 sec | 6 |
| Primary heat temperature |  | 220 |  |  | ℃ | Primary heat, 60~120 sec | 6 |
| Peak reflow temperature |  |  |  | 260 | ℃ | Peak, 10 sec. Max. | 6 |
| Manual soldering iron bit temperature |  |  |  | 350 | ℃ | Time 3 sec max.; each terminal soldered once | 6 |
| Storage environmental temperature |  |  |  | 85 | ℃ | Maximum | 7 |
| Storage relative humidity |  |  |  | 80 | % | Maximum | 7 |

## CAD (KiCad official)

- Symbol: `X2C037400BG1HA-U`
- Footprint: `Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm`
- 3D model: SMD2016-4P (KiCad packages3D, STEP)
- 3D model files: `x2c037400bg1ha-u-etched.step` / `x2c037400bg1ha-u-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `x2c037400bg1ha-u.step` / `x2c037400bg1ha-u.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HELE(Harmony Elec) datasheet](docs/x2c037400bg1ha-u-datasheet.pdf) (11 pp, sha256 `27bc1329386d27d2`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/x2c037400bg1ha-u-datasheet.pdf)