# S1206-S-3.5A

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

S1206-S-3.5A 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 | 1 | passive | One of two interchangeable end terminations (silver over-plated with tin) of the 3.5A slow-blow fuse, rated 32V DC with 50A/32V DC interrupting rating. |
| 2 | 2 | passive | Second interchangeable end termination of the 3.5A slow-blow fuse, with max cold DCR 0.035 ohm and non-polarized connection. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | SART Nanjing Sart Tech |
| Package | 1206 |
| 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 |
|---|---|---|---|---|---|---|---|
| Max cold DCR |  |  |  | 0.035 | Ω | Measured at ≤10% rated current and 25℃ | 1 |
| Interrupting rating |  |  |  | 50 | A | 32V DC, 1A-3.5A; without permanent arcing, ignition and bursting of fuse link | 4 |
| Operating temperature |  | -50 |  | 125 | ℃ |  | 1 |
| Opening time at 200% of rated current |  |  |  | 60 | sec | 200% of rated current, 1A-7A | 3 |
| Opening time at 1000% of rated current |  | 1 |  |  | ms | 1000% of rated current, 1A-7A | 3 |
| Non-opening time at 100% of rated current |  | 4 |  |  | hours | 100% of rated current, 1A-7A, no fusing | 3 |
| Voltage drop mean value deviation |  |  |  | 15 | % | 100% In, temperature stabilized; IEC 60127-1 | 4 |
| Temperature rise | /△T/ |  |  | 75 | ℃ | 100%In; UL248-14 | 4 |
| Endurance resistance change | /△R/ |  |  | 10 | % | 100% In, 1h on, 15min off, 100 cycles; followed by 1h at 125%In | 4 |
| Solderability wetting coverage |  | 95 |  |  | % | 240±5℃, 3±0.5 sec; IEC60127-4 | 4 |
| Infrared reflow peak temperature |  |  |  | 260 | ℃ | Infrared reflow, 5 sec max | 5 |
| Wave soldering reservoir temperature |  |  |  | 260 | ℃ | Wave soldering, reservoir, 10 sec max | 5 |
| Storage ambient temperature |  | 5 |  | 30 | ℃ | Storage | 6 |
| Storage relative humidity |  | 25 |  | 60 | % | Storage | 6 |
| Rated current |  |  | 3.5 |  | A |  | 1 |
| Voltage rating |  |  | 32 |  | V DC |  | 1 |
| Typical I2T |  |  | 1.5312 |  | A2S | Melting I2T at 10 times of rated current | 1 |

## CAD (KiCad official)

- Symbol: `S1206-S-3.5A`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `s1206-s-3-5a-etched.step` / `s1206-s-3-5a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `s1206-s-3-5a.step` / `s1206-s-3-5a.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/8590226693001539584) (6 pp, sha256 `dc2abe5530d1455d`, retrieved 2026-10-17, 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/s1206-s-3-5a-datasheet.pdf)