# SX2B40.000F1510F30

**Shenzhen SCTF Elec** · Crystals · SMD2520-4P

SX2B40.000F1510F30 from Shenzhen SCTF Elec, in a SMD2520-4P. 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 1 (square-cut pad corner, bottom view), connected through the crystal element to pad 3; 40.000MHz fundamental, 15pF load capacitance. |
| 2 | COVER_2 | passive | Connected to the metal cover; the datasheet says to connect it to GND or leave it floating. |
| 3 | XTAL2 | passive | Crystal terminal 2, connected through the crystal element to pad 1; 40.000MHz fundamental, 15pF load capacitance. |
| 4 | COVER_4 | passive | Connected to the metal cover; the datasheet says to connect it to GND or leave it floating. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shenzhen SCTF Elec |
| Package | SMD2520-4P |
| 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 tolerance at 25℃±2℃ | Δf/f | -10 |  | 10 | ppm | at 25℃±2℃ | 3 |
| Temperature drift over operating temperature range | f_tem | -30 |  | 30 | ppm | Over operating temp. range (reference 25℃) | 3 |
| Aging, 1st year | f_age | -3 |  | 3 | ppm | 1st year | 3 |
| Negative resistance | -R | 200 |  |  | Ω | See 2.3 | 3 |
| Effective resistance | RR |  |  | 40 | Ω |  | 3 |
| Shunt capacitance | C0 |  |  | 3 | pF |  | 3 |
| Insulation resistance | IR | 500 |  |  | MΩ | at DC 100V | 3 |
| Drive level (maximum) | DL |  |  | 100 | μW | See 2.1 | 3 |
| Drive level (typical) | DL |  | 10 |  | μW |  | 3 |
| Spurious response | SPDB |  |  | -3 | dB |  | 3 |
| Storage temperature range | T_stg | -55 |  | 125 | ℃ |  | 3 |
| Operating temperature range | T_use | -40 |  | 85 | ℃ |  | 3 |
| Frequency change after reliability tests | ΔFL | -5 |  | 5 | ppm | After reliability tests | 7 |
| Nominal frequency | f |  | 40 |  | MHz | Fundamental | 3 |
| Load capacitance | CL |  | 15 |  | pF |  | 3 |

## CAD (KiCad official)

- Symbol: `SX2B40.000F1510F30`
- Footprint: `Crystal:Crystal_SMD_2520-4Pin_2.5x2.0mm`
- 3D model: SMD2520-4P (KiCad packages3D, STEP)
- 3D model files: `sx2b40-000f1510f30-etched.step` / `sx2b40-000f1510f30-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sx2b40-000f1510f30.step` / `sx2b40-000f1510f30.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shenzhen SCTF Elec datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590201870229663744) (8 pp, sha256 `ac684978c0ec7587`, retrieved 2026-10-21, 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:** `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/sx2b40-000f1510f30-datasheet.pdf)