# 8122S-40.000NQ18FTL

**HCI** · Temperature Compensated Crystal Oscillators (TCXO) · SMD2520-4P

8122S-40.000NQ18FTL from HCI, 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 | GND/N.C. | power_in | Pad 1 is ground (GND) or N.C. per the datasheet pad table; the datasheet does not state which for this MPN. |
| 2 | GND | power_in | Ground pin; the metal lid is connected to ground pin 2. |
| 3 | Output | output | RF clipped sine wave output, 0.8Vp-p minimum into a 10kΩ/10pF load. |
| 4 | Vcc | power_in | Supply voltage pin, with 1.8V, 2.5V, 2.8V, 3.0V or 3.3V options listed by the datasheet. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HCI |
| 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 (initial) |  | -2 |  | 2 | ppm | Initial tol. @+25°C | 1 |
| Aging per year |  | -1 |  | 1 | ppm | @+25°C | 1 |
| Output voltage level |  | 0.8 |  |  | Vp-p | Minimum; clipped sine wave, 10kΩ/10pF load | 1 |
| Phase jitter RMS |  |  |  | 1 | ps | 12kHz≤Fj≤20MHz | 1 |
| Frequency range |  | 10 |  | 52 | MHz |  | 1 |
| Nominal frequency |  |  | 40 |  | MHz | From MPN 8122S-40.000... | 1 |

## CAD (KiCad official)

- Symbol: `8122S-40.000NQ18FTL`
- Footprint: `Crystal:Crystal_SMD_2520-4Pin_2.5x2.0mm`
- 3D model: SMD2520-4P (KiCad packages3D, STEP)
- 3D model files: `8122s-40-000nq18ftl-etched.step` / `8122s-40-000nq18ftl-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `8122s-40-000nq18ftl.step` / `8122s-40-000nq18ftl.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HCI datasheet](docs/8122s-40-000nq18ftl-datasheet.pdf) (1 pp, sha256 `0f281b2939e0aa6c`, retrieved 2026-10-27, tier: lcsc)
- **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/8122s-40-000nq18ftl-datasheet.pdf)