# KSMF28A-E3-08

**KUU** · TVS · SOD-123FL

KSMF28A-E3-08 from KUU, 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 | Cathode | passive | Cathode terminal of the SOD-123FL package, listed in the datasheet PINNING table as pin 1. |
| 2 | Anode | passive | Anode terminal of the SOD-123FL package, listed in the datasheet PINNING table as pin 2. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KUU |
| 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 |
|---|---|---|---|---|---|---|---|
| Peak Pulse Power Dissipation | PPPM |  |  | 200 | W | TA=25°C, 10/1000 µs waveform (Note 1,2,5, Fig 1) | 1 |
| Peak Forward Surge Current (UNI) | IFSM |  |  | 20 | A | 8.3 ms single half sinewave (Note 3) | 1 |
| Steady State Power Dissipation | PM(AV) |  |  | 1 | W | Note 4, lead temperature TL=75°C | 1 |
| Operating Junction and Storage Temperature Range | TJ,TSTG | -55 |  | 150 | °C |  | 1 |
| Breakdown Voltage | VBR | 31.1 |  | 34.4 | V | @ IT = 1 mA (KSMF28A row) | 2 |
| Maximum Clamp Voltage | VC |  |  | 45.4 | V | @ IPP = 4.4 A | 2 |
| Reverse Leakage Current | IR |  |  | 1 | μA | @ VRWM = 28 V | 2 |
| Peak Pulse Current | IPP |  |  | 4.4 | A | 10/1000 µs waveform (Table 1 IPP column, KSMF28A row) | 2 |
| Typical Thermal Resistance Junction to Ambient | RθJA |  | 180 |  | °C | Typical value as printed | 1 |
| Reverse Stand-Off Voltage | VRWM |  | 28 |  | V | Note 6: select device with VRWM equal to or greater than DC or continuous peak operating voltage | 2 |

## 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 | copper |  | 2. Mounted on 5mm copper pads to each terminal | 1 |

## CAD (KiCad official)

- Symbol: `KSMF28A-E3-08`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123FL (KiCad packages3D, STEP)
- 3D model files: `ksmf28a-e3-08-etched.step` / `ksmf28a-e3-08-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ksmf28a-e3-08.step` / `ksmf28a-e3-08.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [KUU datasheet](docs/ksmf28a-e3-08-datasheet.pdf) (4 pp, sha256 `601ec5d506c70536`, 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/ksmf28a-e3-08-datasheet.pdf)