# SZ1SMA5.0AT3G

**Littelfuse** · TVS · SMA(DO-214AC)

SZ1SMA5.0AT3G from Littelfuse, in a SMA(DO-214AC). 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 | Cathode | passive | Cathode terminal of the uni-directional TVS; the color band on the package denotes the cathode. |
| 2 | Anode | passive | Anode terminal of the uni-directional TVS, which is the terminal opposite the cathode band. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | SMA(DO-214AC) |
| 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 | 6.4 | 6.7 | 7 | V | @ IT = 10 mA (Note 7: measured at 25°C) | 3 |
| Forward Voltage | VF |  |  | 3.5 | V | @ IF = 30 A (Note 5), uni-directional | 2 |
| Maximum Reverse Leakage Current | IR |  |  | 400 | µA | @ VRWM = 5.0 V | 3 |
| Maximum Reverse Peak Pulse Current | IPP |  |  | 43.5 | A | Surge waveform per Figure 2 (Note 8) | 3 |
| Peak Power Dissipation | PPK |  |  | 400 | W | TL = 25°C, Pulse Width = 1 ms (Note 1: 10x1000 µs, non-repetitive) | 1 |
| Forward Surge Current (uni-directional) | IFSM |  |  | 40 | A | TA = 25°C, 1/2 sine wave, PW = 8.3 ms (Note 4) | 1 |
| Operating and Storage Temperature Range | TJ, Tstg | -65 |  | 150 | °C |  | 1 |
| DC Power Dissipation at lead | PD |  |  | 1.5 | W | TL = 75°C, measured zero lead length (Note 2) | 1 |
| DC Power Dissipation at ambient | PD |  |  | 0.5 | W | TA = 25°C, FR-4 board, Littelfuse minimum recommended footprint (Note 3) | 1 |
| Thermal Resistance Junction-to-Lead | RƟJL |  |  | 50 | °C/W | Note 2: 1 in square copper pad, FR-4 board | 1 |
| Thermal Resistance Junction-to-Ambient | RƟJA |  |  | 250 | °C/W | Note 3: FR-4 board, Littelfuse minimum recommended footprint | 1 |
| Typical Junction Capacitance | C |  | 2035 |  | pF | Bias voltage = 0 V, F = 1.0 MHz, TJ = 25°C (Note 9) | 3 |

## 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: `SZ1SMA5.0AT3G`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)

## Provenance

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

- **Datasheet:** [Littelfuse datasheet](docs/sz1sma5-0at3g-datasheet.pdf) (7 pp, sha256 `2dcbd1b5c6bf6a05`, retrieved 2026-10-30, 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/sz1sma5-0at3g-datasheet.pdf)