# SMF4L26A

**LGE** · ESD And Surge Protection (TVS/ESD) · SOD-123FL

SMF4L26A from LGE, in a SOD-123FL. 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 | K | passive | Cathode: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | LGE |
| Package | SOD-123FL |
| 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 VBR (uni-directional), minimum | VBR | 28.9 |  |  | V | @IT 1 mA | 2 |
| Breakdown voltage VBR (uni-directional), maximum | VBR |  |  | 31.9 | V | @IT 1 mA | 2 |
| Maximum reverse leakage current | IR |  |  | 1 | μA | @VR 26 V | 2 |
| Maximum peak pulse current | IPP |  |  | 9.5 | A | Surge current waveform 10/1000 μs (note 2) | 2 |
| Maximum clamping voltage | VC |  |  | 42.1 | V | @IPP | 2 |
| Peak power dissipation, 10/1000 μs waveform | PPP |  |  | 400 | W | 10/1000 μs waveform (note 1) | 1 |
| Peak power dissipation, 8/20 μs waveform | PPP |  |  | 2000 | W | 8/20 μs waveform (note 1) | 1 |
| Peak forward surge current, unidirectional | IFSM |  |  | 30 | A | 8.3 ms single half sine-wave, unidirectional only (note 2) | 1 |
| Maximum instantaneous forward voltage, unidirectional | VF |  |  | 3.5 | V | at 25 A, unidirectional only | 1 |
| Junction temperature | TJ |  |  | 150 | ℃ |  | 1 |
| Storage temperature range | TSTG | -55 |  | 150 | ℃ |  | 1 |
| Thermal resistance junction to ambient | RΘJA |  |  | 220 | ℃/W |  | 1 |
| Thermal resistance junction to lead | RΘJL |  |  | 100 | ℃/W |  | 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 | ◇ Terminals:Matte Tin lead-free plated Finish. Solderable per MIL-STD-202 Method 208 | 1 |

## CAD (KiCad official)

- Symbol: `SMF4L26A`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123FL (KiCad packages3D, STEP)
- 3D model files: `smf4l26a-etched.step` / `smf4l26a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smf4l26a.step` / `smf4l26a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [LGE datasheet](docs/smf4l26a-datasheet.pdf) (3 pp, sha256 `b73f7e14c9df9aa5`, retrieved 2026-10-21, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `cathode-band convention` (convention), consensus `off` (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/smf4l26a-datasheet.pdf)