# TZ3451D

**TST** · Crystals · SMD3225-4P

TZ3451D 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 connected to one side of the resonator, for the 40.000MHz fundamental oscillator circuit with 10 pF load capacitance. |
| 2 | GND | power_in | Ground pad, connected to the package lid/ground per the pin connection table. |
| 3 | IN/OUT | passive | Crystal terminal connected to the other side of the resonator, for the 40.000MHz fundamental oscillator circuit with 10 pF load capacitance. |
| 4 | GND | power_in | Ground pad, connected to the package lid/ground 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 stability over operating temperature (-40C to +100C) |  | -15 |  | 15 | ppm | Referred to the value at 25C, -40C to +100C | 3 |
| Frequency stability over operating temperature (100C to +105C) |  | -20 |  | 20 | ppm | Referred to the value at 25C, 100C to +105C | 3 |
| Frequency make tolerance (FL) | FL | -7 |  | 7 | ppm | @ 25C +/- 3C | 3 |
| Equivalent series resistance (ESR) | ESR |  |  | 15 |  |  | 3 |
| Nominal drive level |  |  | 10 | 400 | uW | Typical 10 uW, maximum 400 uW | 3 |
| Shunt capacitance | Co |  |  | 3 | pF |  | 3 |
| Trim sensitivity | TS | 10 |  | 13 | ppm/pF |  | 3 |
| Aging |  | -2 |  | 2 | ppm/year |  | 3 |
| Insulation resistance |  | 500 |  |  | M | DC 100V | 3 |
| Operating temperature range |  | -40 |  | 105 | C |  | 3 |
| Storage temperature range |  | -40 |  | 125 | C |  | 3 |
| Nominal frequency |  |  | 40 |  | MHz |  | 3 |
| Load capacitance | CL |  | 10 |  | pF |  | 3 |

## CAD (KiCad official)

- Symbol: `TZ3451D`
- Footprint: `Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm`
- 3D model: SMD3225-4P (KiCad packages3D, STEP)
- 3D model files: `tz3451d-etched.step` / `tz3451d-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tz3451d.step` / `tz3451d.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TST datasheet](docs/tz3451d-datasheet.pdf) (7 pp, sha256 `259aa65fb2d45e1b`, retrieved 2026-10-21, 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/tz3451d-datasheet.pdf)