# S1206-S-2.5A

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

S1206-S-2.5A 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 end termination of the 2.5A slow-blow fuse (silver over-plated with tin), rated 32V DC with 50A/32V DC interrupting rating, nonpolarized and interchangeable with pin 2. |
| 2 | 2 | passive | Other end termination of the 2.5A slow-blow fuse (silver over-plated with tin), rated 32V DC with 50A/32V DC interrupting rating, nonpolarized and interchangeable with pin 1. |

## 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 |
|---|---|---|---|---|---|---|---|
| Rated current |  |  | 2.5 |  | A |  | 1 |
| Voltage rating |  |  | 32 |  | V DC |  | 1 |
| Interrupting rating |  |  | 50 |  | A | 50A/32V DC (1A-3.5A) | 1 |
| Max cold DCR | DCR |  |  | 0.073 | Ω | Measured at ≤10% rated current and 25℃ | 1 |
| Typical I2T | I2T |  | 0.7343 |  | A2S | Melting I2T at 10 times of rated current | 1 |
| Voltage drop deviation |  |  |  | 15 | % | 100% In; temperature in fuse stabilized; deviation between the mean value (IEC 60127-1) | 4 |
| Opening time at 100% rated current |  | 4 |  |  | hours | 100% In, no fusing | 3 |
| Opening time at 200% rated current |  |  |  | 60 | sec | 200% In | 3 |
| Opening time at 1000% rated current |  | 1 |  |  | ms | 1000% In (1A-7A) | 3 |
| Temperature rise | ΔT |  |  | 75 | ℃ | 100% In (UL248-14) | 4 |
| Endurance resistance change | /ΔR/ |  |  | 10 | % | 100% In, 1h on, 15min off, 100 cycles; followed by 1h at 125% In | 4 |
| High temperature operating life resistance change | /ΔR/ |  |  | 10 | % | 70℃±2℃, 96 hours, at 60% In; no fusing | 4 |
| Low temperature storage resistance change | /ΔR/ |  |  | 10 | % | -55℃±2℃, 96 hours | 4 |
| High temperature storage resistance change | /ΔR/ |  |  | 10 | % | 125℃±2℃, 96 hours | 4 |
| Humidity (steady state) resistance change | /ΔR/ |  |  | 10 | % | 40℃±2℃, 90%～95%RH, 1000 hours | 4 |
| Salt spray resistance change | /ΔR/ |  |  | 10 | % | 5% salt solution, 48 hours exposure | 4 |
| Thermal shock resistance change | /ΔR/ |  |  | 10 | % | 5 cycles between -55℃/+125℃, 60 minutes each extreme | 4 |
| Resistance to soldering resistance change | /ΔR/ |  |  | 10 | % | 260℃±5℃, 10sec±0.5sec | 4 |
| Bending test resistance change | /ΔR/ |  |  | 10 | % | Distance between holding points 90mm; bending 1mm; time 10sec | 4 |
| Solderability wetting coverage |  | 95 |  |  | % | 240℃±5℃, 3sec±0.5sec | 4 |
| Operating temperature |  | -50 |  | 125 | ℃ |  | 1 |
| Infrared reflow peak temperature |  |  |  | 260 | ℃ | Infrared reflow | 5 |
| Infrared reflow time |  |  |  | 5 | sec | Infrared reflow, max | 5 |
| Wave soldering reservoir temperature |  |  |  | 260 | ℃ | Wave soldering | 5 |
| Wave soldering time in reservoir |  |  |  | 10 | sec | Wave soldering, max | 5 |
| Hand soldering temperature |  |  |  | 350 | ℃ | Hand soldering | 5 |
| Hand soldering time |  |  |  | 5 | sec | Hand soldering, max | 5 |
| Storage ambient temperature |  | 5 |  | 30 | ℃ | Storage | 6 |
| Storage relative humidity |  | 25 |  | 60 | %RH | Storage | 6 |

## CAD (KiCad official)

- Symbol: `S1206-S-2.5A`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `s1206-s-2-5a-etched.step` / `s1206-s-2-5a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `s1206-s-2-5a.step` / `s1206-s-2-5a.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/8590176013742747648) (6 pp, sha256 `dc2abe5530d1455d`, retrieved 2026-10-18, 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-2-5a-datasheet.pdf)