# SMF4L48CA

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

SMF4L48CA from Littelfuse, 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 | A1 | passive | Bi-directional TVS terminal with no polarity (SMF4L48CA: VR 48 V, VBR 53.30-58.90 V at 1 mA, VC 77.4 V at Ipp 5.2 A); connects to the protected line or ground interchangeably with pin 2. |
| 2 | A2 | passive | Bi-directional TVS terminal with no polarity (SMF4L48CA: VR 48 V, VBR 53.30-58.90 V at 1 mA, VC 77.4 V at Ipp 5.2 A); connects to the protected line or ground interchangeably with pin 1. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | SOD-123FL |
| Category | Circuit Protection |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `SMF4L48CA`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123FL (KiCad packages3D, STEP)
- 3D model files: `smf4l48ca-etched.step` / `smf4l48ca-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smf4l48ca.step` / `smf4l48ca.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/8589918175765688320) (6 pp, sha256 `7971ab636790fc84`, retrieved 2026-10-12, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/smf4l48ca-datasheet.pdf)