# 7U38400E12UCG

**SJK(SHENZHEN CRYSTAL TECH)** · Crystals · SMD3225-4P

7U38400E12UCG from SJK(SHENZHEN CRYSTAL TECH), 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 | XTAL1 | passive | Crystal terminal (chamfered pad-1 corner) connected to one side of the quartz element, 38.400 MHz fundamental, CL 12 pF. |
| 2 | GND | power_in | Ground pad, marked GND in the Top View Crystal Connection drawing (lid/case ground). |
| 3 | XTAL2 | passive | Crystal terminal connected to the other side of the quartz element, 38.400 MHz fundamental, CL 12 pF. |
| 4 | GND | power_in | Ground pad, marked GND in the Top View Crystal Connection drawing (lid/case ground). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | SJK(SHENZHEN CRYSTAL TECH) |
| Package | SMD3225-4P |
| 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°C | 2 |
| Frequency Stability Over Operating Temperature |  | -10 |  | 10 | ppm | -20 °C to +70 °C | 2 |
| Frequency Stability Over Operating Temperature |  | -30 |  | 30 | ppm | -40 °C to +85 °C | 2 |
| Shunt Capacitance | C0 |  |  | 3 | pF |  | 2 |
| Equivalent Series Resistance | ESR |  |  | 40 | Ω |  | 2 |
| Aging |  | -3 |  | 3 | ppm/year | @25°C 1st year | 2 |
| Operating Temperature Range |  | -40 |  | 85 | °C |  | 2 |
| Storage Temperature Range |  | -40 |  | 125 | °C |  | 2 |
| Nominal Frequency |  |  | 38.4 |  | MHz | AT/Fundamental | 2 |
| Load Capacitance | CL |  | 12 |  | pF |  | 2 |
| Driver Level |  |  | 10 |  | µW | Typical | 2 |

## CAD (KiCad official)

- Symbol: `7U38400E12UCG`
- Footprint: `Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm`
- 3D model: SMD3225-4P (KiCad packages3D, STEP)
- 3D model files: `7u38400e12ucg-etched.step` / `7u38400e12ucg-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `7u38400e12ucg.step` / `7u38400e12ucg.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [SJK(SHENZHEN CRYSTAL TECH) datasheet](docs/7u38400e12ucg-datasheet.pdf) (4 pp, sha256 `de78385bacdf64ec`, retrieved 2026-10-22, 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 0.3`, primary `claude-sonnet-5-5` (text+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/7u38400e12ucg-datasheet.pdf)