# TZ1181EAAA32

**TST** · Crystals · SMD2520-4P

TZ1181EAAA32 from TST, 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 | IN/OUT | passive | Crystal terminal (IN/OUT) for the 40.000000 MHz fundamental-mode crystal, with 7 pF load capacitance. |
| 2 | GND | power_in | Ground pad, connected to GND per the pin connection table. |
| 3 | IN/OUT | passive | Second crystal terminal (IN/OUT) for the 40.000000 MHz crystal, with 7 pF load capacitance. |
| 4 | GND | power_in | Ground pad, connected to GND per the pin connection table. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TST |
| 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 Make Tolerance (FL) | FL | -7 |  | 7 | ppm | @ 25C +/- 3C | 3 |
| Frequency Stability over Operating Temperature Range |  | -10 |  | 10 | ppm | referred to the value at 25C; -30C to +85C | 3 |
| Aging |  | -2 |  | 2 | ppm/year |  | 3 |
| Equivalent Series Resistance (ESR) | ESR |  |  | 20 | Ω |  | 3 |
| Shunt Capacitance (Co) | Co |  |  | 2 | pF |  | 3 |
| Nominal Drive Level |  |  | 10 | 350 | uW | typical and max as printed | 3 |
| Insulation Resistance |  | 500 |  |  | M | DC 100V | 3 |
| Trim Sensitivity tolerance | TS | -10 |  | 10 | % | printed as +/-10% of the 19.2 ppm/pF typical | 3 |
| Operating Temperature Range |  | -40 |  | 105 | C |  | 3 |
| Storage Temperature Range |  | -40 |  | 105 | C | storage | 3 |
| Nominal Frequency |  |  | 40 |  | MHz |  | 3 |
| Load Capacitance (CL) | CL |  | 7 |  | pF |  | 3 |
| Trim Sensitivity (TS) | TS |  | 19.2 |  | ppm/pF | typical | 3 |

## CAD (KiCad official)

- Symbol: `TZ1181EAAA32`
- Footprint: `Crystal:Crystal_SMD_2520-4Pin_2.5x2.0mm`
- 3D model: SMD2520-4P (KiCad packages3D, STEP)
- 3D model files: `tz1181eaaa32-etched.step` / `tz1181eaaa32-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tz1181eaaa32.step` / `tz1181eaaa32.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/8603106655312109568) (7 pp, sha256 `6e4de3f5bed567fe`, retrieved 2026-10-21, tier: lcsc)
- **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/tz1181eaaa32-datasheet.pdf)