# SZ1SMB16CAT3G

**Littelfuse** · TVS · SMB

SZ1SMB16CAT3G from Littelfuse, in a SMB. 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 | 1 | passive | One of two symmetric TVS terminals of the bi-directional SZ1SMB16CAT3G; the datasheet gives no polarity for this variant, and the Cathode label on the SMB drawing applies to uni-directional parts. |
| 2 | 2 | passive | The second of two symmetric TVS terminals of the bi-directional SZ1SMB16CAT3G; the datasheet gives no polarity for this variant, and the Anode label on the SMB drawing applies to uni-directional parts. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | SMB |
| Category | TVS/Fuse/Board Level 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 | VBR | 17.8 | 18.74 | 19.7 | V | @ IT 1.0 mA | 4 |
| Reverse leakage current | IR |  |  | 5 | µA | @ VRWM 16 V | 4 |
| Maximum clamping voltage | VC |  |  | 26 | V | @ IPP 23.1 A (Note 8) | 4 |
| Working peak reverse voltage | VRWM |  | 16 |  | V | Note 6 | 4 |
| Peak power dissipation | PPK |  |  | 600 | W | TL = 25°C, pulse width = 1 ms (Note 1) | 1 |
| DC power dissipation at TL | PD |  |  | 3 | W | @ TL = 75°C, measured zero lead length (Note 2) | 1 |
| DC power dissipation at TA | PD |  |  | 0.55 | W | @ TA = 25°C (Note 3) | 1 |
| Thermal resistance junction-to-lead | RθJL |  |  | 25 | °C/W |  | 1 |
| Thermal resistance junction-to-ambient | RθJA |  |  | 100 | °C/W |  | 1 |
| Operating and storage temperature range | TJ, Tstg | -65 |  | 175 | °C |  | 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 | the terminal finish material is tin(Sn) (IPC/JEDEC J-STD￾609A.01) | 1 |

## CAD (KiCad official)

- Symbol: `SZ1SMB16CAT3G`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: SMB (KiCad packages3D, STEP)

## Provenance

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

- **Datasheet:** [Littelfuse datasheet](docs/sz1smb16cat3g-datasheet.pdf) (7 pp, sha256 `9b427104bf8c86ce`, retrieved 2026-11-02, 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/sz1smb16cat3g-datasheet.pdf)