# S0603-S-3.5A

**SART Nanjing Sart Tech** · Disposable Fuses · 0603

S0603-S-3.5A from SART Nanjing Sart Tech, in a 0603. 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 fuse termination (silver over-plated with tin) on the 1.6mm x 0.8mm body; non-polarized, rated 3.5A, 32V DC, 50A/32V DC interrupting rating, max cold DCR 0.022 ohm. |
| 2 | 2 | passive | Second fuse termination (silver over-plated with tin), interchangeable with the other end; non-polarized, rated 3.5A, 32V DC, slow blow. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | SART Nanjing Sart Tech |
| Package | 0603 |
| 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 |
|---|---|---|---|---|---|---|---|
| Maximum cold DCR |  |  |  | 0.022 | Ω | S0603-S-3.5A (marking R), cold resistance | 1 |
| Opening time at 1000% of rated current (3.5A-6A) |  | 0.6 |  |  | ms | 1000% of current rating; 3.5A-6A range | 3 |
| Opening time at 200% of rated current |  |  |  | 60 | s | 200% of current rating; 1A-8A range | 3 |
| Opening time at 100% of rated current |  | 4 |  |  | h | 100% of current rating; 1A-8A range | 3 |
| Temperature rise | ΔT |  |  | 75 | ℃ | 100% In, per UL248-14 | 4 |
| Voltage drop deviation between mean values |  |  |  | 15 | % | 100% In, temperature in fuse stabilized, per IEC 60127-1 | 4 |
| Resistance change after endurance test | ΔR |  |  | 10 | % | 100% In, 1h on/15min off, 100 cycles; followed by 1h at 125% In | 4 |
| Resistance change after resistance to soldering | ΔR |  |  | 10 | % | 260℃±5℃, 10sec±0.5sec | 4 |
| Operating temperature |  | -50 |  | 125 | ℃ |  | 1 |
| Storage ambient temperature |  | 5 |  | 30 | ℃ | Storage | 6 |
| Storage relative humidity |  | 25 |  | 60 | % | Storage | 6 |
| Infrared reflow peak temperature |  |  |  | 260 | ℃ | Infrared reflow, Pb-free profile | 5 |
| Infrared reflow time |  |  |  | 5 | s | Infrared reflow, temperature 260℃ | 5 |
| Wave soldering reservoir temperature |  |  |  | 260 | ℃ | Wave soldering | 5 |
| Wave soldering time in reservoir |  |  |  | 10 | s | Wave soldering, reservoir temperature 260℃ | 5 |
| Hand soldering temperature |  |  |  | 350 | ℃ | Hand soldering | 5 |
| Hand soldering time |  |  |  | 5 | s | Hand soldering, temperature 350℃ | 5 |
| Rated current | In |  | 3.5 |  | A | S0603-S-3.5A | 1 |
| Rated voltage |  |  |  | 32 | V DC | DC | 1 |
| Interrupting rating |  |  | 50 |  | A | 32V DC; 1A-3.5A per interrupting ability test | 4 |
| Typical I2T | I2T |  | 0.9758 |  | A2S | Melting I2T at 10 times rated current | 1 |

## CAD (KiCad official)

- Symbol: `S0603-S-3.5A`
- Footprint: `Fuse:Fuse_0603_1608Metric`
- 3D model: 0603 (KiCad packages3D, STEP)
- 3D model files: `s0603-s-3-5a-etched.step` / `s0603-s-3-5a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `s0603-s-3-5a.step` / `s0603-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/8588903690748481536) (6 pp, sha256 `d269772fdc88bb7e`, retrieved 2026-10-16, 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/s0603-s-3-5a-datasheet.pdf)