# 3TJ437400UYFBC

**JYJE** · Crystals · SMD3225-4P

3TJ437400UYFBC from JYJE, 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 connected to one side of the resonator per the Top View Crystal Connection drawing (8.0MHz~66.0MHz fundamental, CL 6pF~20pF or specified). |
| 2 | GND | power_in | Ground pin, labelled GND in the Top View Crystal Connection drawing (connected to the lid/case). |
| 3 | XTAL2 | passive | Crystal terminal connected to the opposite side of the resonator per the Top View Crystal Connection drawing (drive level 10uW~50uW typical). |
| 4 | GND | power_in | Ground pin, labelled GND in the Top View Crystal Connection drawing (connected to the lid/case). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | JYJE |
| Package | SMD3225-4P |
| Category | Crystals, Oscillators, Resonators |
| 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 range (Fund) |  | 8 |  | 66 | MHz | 8.0MHz～66.0MHz (Fund); family range, this MPN's frequency not decodable | 1 |
| Frequency vs temperature deviation (±10ppm option) |  | -10 |  | 10 | ppm | Frequency drift over operating temperature; printed pairing with temperature range unclear | 1 |
| Frequency vs temperature deviation (±20ppm option) |  | -20 |  | 20 | ppm | Frequency drift over operating temperature; printed pairing with temperature range unclear | 1 |
| Aging |  | -3 |  | 3 | ppm/year | 25℃, Maximum | 1 |
| Shunt capacitance | C0 |  |  | 7 | pf | Maximum | 1 |
| Insulation resistance |  | 500 |  |  | Mohms | at DC 100V | 1 |
| Load capacitance | CL | 6 |  | 20 | pf | or specify | 1 |
| Equivalent series resistance (ESR) |  |  |  | 120 | ohm | 8.000-12.000 MHz, Fundamental | 1 |
| Equivalent series resistance (ESR) |  |  |  | 80 | ohm | 12.000-18.000 MHz, Fundamental | 1 |
| Equivalent series resistance (ESR) |  |  |  | 60 | ohm | 18.000-25.000 MHz, Fundamental | 1 |
| Equivalent series resistance (ESR) |  |  |  | 40 | ohm | 25.000-30.000 MHz, Fundamental | 1 |
| Equivalent series resistance (ESR) |  |  |  | 30 | ohm | 30.000-66.000 MHz, Fundamental | 1 |
| Operating temperature range (standard) |  | -20 |  | 70 | ℃ | Pairing with grade not printed for this MPN | 1 |
| Operating temperature range (extended) |  | -40 |  | 85 | ℃ | Pairing with grade not printed for this MPN | 1 |
| Storage temperature range (standard) |  | -20 |  | 60 | ℃ | Pairing with grade not printed for this MPN | 1 |
| Storage temperature range (extended) |  | -55 |  | 125 | ℃ | Pairing with grade not printed for this MPN | 1 |

## CAD (KiCad official)

- Symbol: `3TJ437400UYFBC`
- Footprint: `Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm`
- 3D model: SMD3225-4P (KiCad packages3D, STEP)
- 3D model files: `3tj437400uyfbc-etched.step` / `3tj437400uyfbc-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `3tj437400uyfbc.step` / `3tj437400uyfbc.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [JYJE datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589835068760743936) (1 pp, sha256 `17336dc94bee4b6f`, retrieved 2026-10-16, 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/3tj437400uyfbc-datasheet.pdf)