# SZ1SMA16CAT3G

**Littelfuse** · ESD And Surge Protection (TVS/ESD) · SMA

SZ1SMA16CAT3G from Littelfuse, in a SMA. 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 | A1 | passive | Bi-directional TVS terminal 1 (SZ1SMA16CAT3G, VRWM 16 V, VBR 17.8-19.67 V @ 1 mA, VC 26.0 V @ 15.4 A); the part is symmetric so either terminal may connect to the line or return. |
| 2 | A2 | passive | Bi-directional TVS terminal 2 (SZ1SMA16CAT3G, VRWM 16 V, VBR 17.8-19.67 V @ 1 mA, VC 26.0 V @ 15.4 A); the part is symmetric so either terminal may connect to the line or return. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | SMA |
| Category | Circuit Protection |
| Pins | 2 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Breakdown Voltage (bi-directional, 16 V) | VBR | 17.8 | 18.74 | 19.67 | V | @ IT = 1 mA (Note 7: measured at 25°C) | 4 |
| Maximum Reverse Leakage Current | IR |  |  | 2.5 | µA | @ VRWM = 16 V | 4 |
| Peak Power Dissipation | PPK |  |  | 400 | W | TL = 25°C, pulse width = 1 ms (Note 1) | 1 |
| DC Power Dissipation @ TL = 75°C (zero lead length) | PD |  |  | 1.5 | W | TL = 75°C, measured zero lead length (Note 2) | 1 |
| DC Power Dissipation @ TA = 25°C | PD |  |  | 0.5 | W | TA = 25°C, FR-4 minimum recommended footprint (Note 3) | 1 |
| Operating and Storage Temperature Range | TJ, Tstg | -65 |  | 150 | °C |  | 1 |
| Thermal Resistance Junction-to-Lead | RθJL |  | 50 |  | °C/W | Measured zero lead length (Note 2) | 1 |
| Thermal Resistance Junction-to-Ambient | RθJA |  | 250 |  | °C/W | FR-4 board, Littelfuse minimum recommended footprint (Note 3) | 1 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | and the terminal finish material is tin(Sn) (IPC/ | 1 |

## CAD (KiCad official)

- Symbol: `SZ1SMA16CAT3G`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `sz1sma16cat3g-etched.step` / `sz1sma16cat3g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sz1sma16cat3g.step` / `sz1sma16cat3g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Littelfuse datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588940047877328896) (7 pp, sha256 `2dcbd1b5c6bf6a05`, retrieved 2026-10-16, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/sz1sma16cat3g-datasheet.pdf)