# SX3B37.400F1210F30

**Shenzhen SCTF Elec** · Crystals · SMD3225-4P

SX3B37.400F1210F30 from Shenzhen SCTF Elec, in a SMD3225-4P. 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 | Xtal | passive | Crystal terminal 1 of the 3.2x2.5x0.7 mm SMD3225-4P resonator, connected to the oscillator circuit (load capacitance CL 6 to 20 pF). |
| 2 | GND | power_in | Ground pad, connected to ground per the pin function table. |
| 3 | Xtal | passive | Crystal terminal 2 of the SMD3225-4P resonator, connected to the oscillator circuit (load capacitance CL 6 to 20 pF). |
| 4 | GND | power_in | Ground pad, connected to ground per the pin function table. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shenzhen SCTF Elec |
| Package | SMD3225-4P |
| Category | Crystal Oscillator/Oscillator/Resonator |
| Pins | 4 |

## CAD (KiCad official)

- Symbol: `SX3B37.400F1210F30`
- Footprint: `Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm`
- 3D model: SMD3225-4P (KiCad packages3D, STEP)
- 3D model files: `sx3b37-400f1210f30-etched.step` / `sx3b37-400f1210f30-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sx3b37-400f1210f30.step` / `sx3b37-400f1210f30.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shenzhen SCTF Elec datasheet](docs/sx3b37-400f1210f30-datasheet.pdf) (5 pp, sha256 `0c7f83787f4b1efb`, retrieved 2026-10-21, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (vision), consensus `claude-opus-5-5` (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/sx3b37-400f1210f30-datasheet.pdf)