# S1206-S-4.0A

**SART Nanjing Sart Tech** · Disposable Fuses · 1206

S1206-S-4.0A from SART Nanjing Sart Tech, in a 1206. 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 | A | passive | Fuse terminal 1 - one of two interchangeable end-cap terminations of the slow-blow silver-element fuse; rated 4.0 A / 32 V DC, interrupting rating 35 A @ 32 V DC, typical cold DCR 23 mΩ. |
| 2 | B | passive | Fuse terminal 2 - the opposing end-cap termination; electrically identical and interchangeable with terminal 1; same ratings: 4.0 A / 32 V DC, 35 A interrupting, 23 mΩ cold DCR. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | SART Nanjing Sart Tech |
| Package | 1206 |
| Category | Circuit Protection |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `S1206-S-4.0A`
- Footprint: `Resistor_SMD:R_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `s1206-s-4-0a-etched.step` / `s1206-s-4-0a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `s1206-s-4-0a.step` / `s1206-s-4-0a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [SART Nanjing Sart Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588914384815476736) (6 pp, sha256 `e611b07598018dfd`, retrieved 2026-09-29, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/s1206-s-4-0a-datasheet.pdf)