component
0494001.NR
Public Made by Adomby adom
Littelfuse Disposable Fuses, 0603. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdown0494001.NR
Littelfuse · Disposable Fuses · 0603
0494001.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 | One of two interchangeable Sn-plated end terminations of the 1A (Amp Code 001.) thin-film fuse, rated 32V max with 50A @32V AC/DC interrupting rating and nominal cold resistance 0.0710 ohms. |
| 2 | 2 | passive | Second interchangeable Sn-plated end termination of the 1A (Amp Code 001.) fuse, in series with pin 1 through the fuse element, rated 32V max with 0.0710 ohms nominal cold resistance. |
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 | 1 | |||
| Opening time at 200% of ampere rating | 5 | sec | Opening time at 25°C | 1 | |||
| Opening time at 300% of ampere rating | 0.2 | sec | Opening time at 25°C | 1 | |||
| Max voltage rating | 32 | V | 1 | ||||
| Interrupting rating | 50 | A | @32V AC/DC | 1 | |||
| Operating temperature | -55 | 90 | °C | Consult temperature rerating curve chart; above 90°C contact Littelfuse | 3 | ||
| Insulation resistance (after opening) | 10000 | ohms | After opening | 3 | |||
| Resistance to soldering heat | 260 | °C | Withstands 60 seconds above 200°C | 3 | |||
| Thermal shock | -55 | 125 | °C | Withstands 5 cycles | 3 | ||
| Reflow pre-heat temperature (Ts(min)) | Ts(min) | 150 | °C | Pb-free reflow, pre-heat | 2 | ||
| Reflow pre-heat temperature (Ts(max)) | Ts(max) | 200 | °C | Pb-free reflow, pre-heat | 2 | ||
| Reflow pre-heat time (ts) | ts | 60 | 180 | seconds | Min to max | 2 | |
| Reflow ramp-up rate (TL to peak) | 5 | °C/second | Average ramp-up rate, Liquidus Temp (TL) to peak | 2 | |||
| Reflow ramp-up rate (TS(max) to TL) | 5 | °C/second | TS(max) to TL | 2 | |||
| Reflow time within 5°C of peak temperature (tp) | tp | 20 | 40 | seconds | Time within 5°C of actual peak temperature | 2 | |
| Reflow ramp-down rate | 5 | °C/second | Ramp-down rate | 2 | |||
| Time from 25°C to peak temperature | 8 | minutes | Time 25°C to peak temperature (TP) | 2 | |||
| Reflow liquidus temperature (TL) | TL | 217 | °C | Reflow, Pb-free assembly | 2 | ||
| Ampere rating (rated current) | 1 | A | Amp code 001.; packaging suffix NR | 1 | |||
| Nominal cold resistance | 0.071 | ohms | Measured at 10% of rated current, 25ºC | 1 | |||
| Nominal melting I2t | 0.0212 | A2sec | 1 | ||||
| Nominal voltage drop | 89.1 | mV | 1 | ||||
| Nominal power dissipation | 0.0891 | W | 1 |
CAD (KiCad official)
- Symbol:
0494001.NR - Footprint:
Fuse:Fuse_0603_1608Metric - 3D model: 0603 (KiCad packages3D, STEP)
- 3D model files:
0494001-nr-etched.step/0494001-nr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);0494001-nr.step/0494001-nr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (3 pp, sha256
cd83e7cef8cdaba4, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).