# 0494005.NR

**Littelfuse** · Disposable Fuses · 0603

0494005.NR from Littelfuse, 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 | Terminal 1 of an unpolarised fuse; either orientation. |
| 2 | 2 | passive | Terminal 2 of an unpolarised fuse; either orientation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| 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 |
|---|---|---|---|---|---|---|---|
| Opening time at 100% of ampere rating |  | 4 |  |  | hours | Opening time at 25°C, 100% of rated current | 1 |
| Opening time at 200% of ampere rating |  |  |  | 5 | sec | Opening time at 25°C, 200% of rated current | 1 |
| Opening time at 300% of ampere rating |  |  |  | 0.2 | sec | Opening time at 25°C, 300% of rated current | 1 |
| Insulation resistance (after opening) |  | 10000 |  |  | ohm | After opening | 3 |
| Maximum voltage rating |  |  |  | 32 | V | AC/DC | 1 |
| Operating temperature |  | -55 |  | 90 | °C | Consult temperature rerating curve; for operation above 90°C contact Littelfuse | 3 |
| Peak reflow temperature limit |  |  |  | 260 | °C | Reflow soldering: do not exceed 260°C; withstands 60 s above 200°C | 2 |
| Interrupting rating |  |  |  | 35 | A | @32V AC/DC (rating block for 1.25 A through 5.00 A ratings) | 1 |
| Rated (ampere) current |  |  | 5 |  | A |  | 1 |
| Nominal cold resistance |  |  | 0.009 |  | Ohms |  | 1 |
| Nominal melting I2t |  |  | 0.9 |  | A2sec |  | 1 |
| Nominal voltage drop |  |  | 72.71 |  | mV |  | 1 |
| Nominal power dissipation |  |  | 0.3635 |  | W |  | 1 |

## CAD (KiCad official)

- Symbol: `0494005.NR`
- Footprint: `Fuse:Fuse_0603_1608Metric`
- 3D model: 0603 (KiCad packages3D, STEP)
- 3D model files: `0494005-nr-etched.step` / `0494005-nr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `0494005-nr.step` / `0494005-nr.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/8588903737759186944) (3 pp, sha256 `cd83e7cef8cdaba4`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `two-terminal convention` (convention), consensus `off` (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/0494005-nr-datasheet.pdf)