# NX2520SA-16MHZ-STD-CSW-5

**NDK** · Crystals · SMD2520-4P

NX2520SA-16MHZ-STD-CSW-5 from NDK, 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, X'tal) of the NX2520SA 16.000 MHz unit, connected to the crystal element; interchangeable with terminal #3. |
| 2 | GND | power_in | Ground terminal connected to the metal cover (#2, GND/cover connection). |
| 3 | XTAL2 | passive | Crystal terminal (#3, X'tal) of the NX2520SA 16.000 MHz unit, connected to the crystal element; interchangeable with terminal #1. |
| 4 | GND | power_in | Ground terminal connected to the metal cover (#4, GND/cover connection). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | NDK |
| 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 |  | -15 |  | 15 | ppm | at +25C | 2 |
| Frequency versus Temperature Characteristic |  | -25 |  | 25 | ppm | at -40 to +85C | 2 |
| Insulation resistance |  | 500 |  |  | Mohm | DC100V 15V applied, terminal to terminal and terminal to cover | 2 |
| Equivalent resistance |  |  |  | 80 | ohm | IEC-network / Series | 2 |
| Level of drive |  |  | 10 | 200 | W |  | 2 |
| Operating temperature range |  | -40 |  | 85 | C |  | 2 |
| Storage temperature range |  | -40 |  | 85 | C |  | 2 |
| Air-tightness |  |  |  | 1.1 | x10-9 Pa m3/s | Helium leak detector | 2 |
| Reflow soldering peak temperature |  |  |  | 265 | C | Peak temperature, 10 sec; reflow passage twice | 3 |
| Manual soldering iron temperature |  |  |  | 400 | C | Soldering iron pressed on terminal electrode, 4 sec (twice) | 3 |
| Load capacitance | CL |  | 8 |  | pF | IEC-network | 2 |
| Nominal frequency | fnom |  | 16 |  | MHz |  | 2 |

## CAD (KiCad official)

- Symbol: `NX2520SA-16MHZ-STD-CSW-5`
- Footprint: `Crystal:Crystal_SMD_2520-4Pin_2.5x2.0mm`
- 3D model: SMD2520-4P (KiCad packages3D, STEP)
- 3D model files: `nx2520sa-16mhz-std-csw-5-etched.step` / `nx2520sa-16mhz-std-csw-5-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `nx2520sa-16mhz-std-csw-5.step` / `nx2520sa-16mhz-std-csw-5.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [NDK datasheet](docs/nx2520sa-16mhz-std-csw-5-datasheet.pdf) (7 pp, sha256 `6d7b02f9870c6428`, retrieved 2026-10-21, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/nx2520sa-16mhz-std-csw-5-datasheet.pdf)