# TZ1897B

**TST** · Crystals · SMD2016-4P

TZ1897B from TST, in a SMD2016-4P. 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 27.12 MHz resonator (interchangeable with pin 3). |
| 2 | GND | power_in | Ground pin connected to the metal cover, per the note that #2 and #4 are connected with a metal cover. |
| 3 | IN/OUT | passive | Crystal terminal connected to the other side of the 27.12 MHz resonator (interchangeable with pin 1). |
| 4 | GND | power_in | Ground pin connected to the metal cover, per the note that #2 and #4 are connected with a metal cover. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TST |
| Package | SMD2016-4P |
| 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 |
|---|---|---|---|---|---|---|---|
| Equivalent Series Resistance (ESR) | ESR |  |  | 60 | Ω |  | 3 |
| Shunt Capacitance | Co |  |  | 5 | pF |  | 3 |
| Nominal Drive Level |  |  | 10 | 100 | uW | typical and max as printed | 3 |
| Frequency Stability over Operating Temperature Range |  | -30 |  | 30 | ppm | referred to the value at 25°C, over operating temperature range | 3 |
| Frequency Make Tolerance (FL) | FL | -10 |  | 10 | ppm | @ 25°C +/- 3°C | 3 |
| Insulation Resistance |  | 500 |  |  | MΩ | DC 100V | 3 |
| Operating Temperature Range |  | -40 |  | 85 | °C |  | 3 |
| Storage Temperature Range |  | -50 |  | 105 | °C |  | 3 |
| Nominal Frequency |  |  | 27.12 |  | MHz |  | 3 |
| Load Capacitance | CL |  | 10 |  | pF |  | 3 |

## CAD (KiCad official)

- Symbol: `TZ1897B`
- Footprint: `Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm`
- 3D model: SMD2016-4P (KiCad packages3D, STEP)
- 3D model files: `tz1897b-etched.step` / `tz1897b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tz1897b.step` / `tz1897b.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TST datasheet](docs/tz1897b-datasheet.pdf) (8 pp, sha256 `85dc12c9cd6fc688`, 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/tz1897b-datasheet.pdf)