# TZ1917B

**TST** · Crystals · SMD3225-4P

TZ1917B from TST, 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 | IN/OUT | passive | Crystal terminal (IN/OUT) of the 12.8 MHz fundamental-mode crystal, 20 pF load capacitance, 100 uW max drive level. |
| 2 | GND | power_in | Ground pad, connected to GND per the pin connection table. |
| 3 | IN/OUT | passive | Second crystal terminal (IN/OUT) of the 12.8 MHz crystal, interchangeable with pin 1. |
| 4 | GND | power_in | Ground pad, connected to GND per the pin connection table. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TST |
| 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 make tolerance | FL | -10 |  | 10 | ppm | @ 25°C +/- 3°C | 3 |
| Frequency stability over operating temperature range |  | -15 |  | 15 | ppm | over operating temperature range, referred to the value at 25°C | 3 |
| Nominal frequency |  |  | 12.8 |  | MHz |  | 3 |
| Equivalent series resistance (ESR) | ESR |  |  | 80 | Ω |  | 3 |
| Nominal drive level |  |  | 10 | 100 | uW |  | 3 |
| Shunt capacitance | Co |  |  | 3 | pF |  | 3 |
| Load capacitance | CL |  | 20 |  | pF |  | 3 |
| Insulation resistance |  | 500 |  |  | MΩ | DC 100V | 3 |
| Operating temperature range |  | -40 |  | 85 | °C |  | 3 |
| Storage temperature range |  | -60 |  | 105 | °C |  | 3 |

## CAD (KiCad official)

- Symbol: `TZ1917B`
- Footprint: `Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm`
- 3D model: SMD3225-4P (KiCad packages3D, STEP)
- 3D model files: `tz1917b-etched.step` / `tz1917b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tz1917b.step` / `tz1917b.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TST datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588893352930918400) (8 pp, sha256 `d3717cd40ba4d207`, retrieved 2026-10-15, 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/tz1917b-datasheet.pdf)