component
0438001.WR
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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Contents
README
markdown0438001.WR
Littelfuse · Disposable Fuses · 0603
0438001.WR 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 | Fuse termination 1 (Ag/Ni/Sn), non-polarized; the 1 A part (amp code 001.) is rated 63VDC with 50A @ 63VDC / 50A @ 32VAC interrupting rating. |
| 2 | 2 | passive | Fuse termination 2 (Ag/Ni/Sn), non-polarized and interchangeable with termination 1; operating temperature -55ºC to +150ºC. |
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 |
|---|---|---|---|---|---|---|---|
| Operating temperature | -55 | 150 | °C | 1 | |||
| Max. voltage rating | 63 | VDC | 1 | ||||
| Interrupting rating | 50 | A | @ 63VDC | 1 | |||
| Opening time at 100% of ampere rating | 4 | hours | at 25ºC | 1 | |||
| Opening time at 250% of ampere rating | 5 | s | at 25ºC | 1 | |||
| Continuous operation current (re-rating) | 80 | % of rated current | operated continuously | 1 | |||
| Peak temperature (TP) deviation | -5 | 260 | 0 | °C | Pb-free reflow, peak temperature | 2 | |
| Wave soldering temperature | 260 | °C | Wave soldering | 2 | |||
| Wave soldering time | 10 | s | Wave soldering | 2 | |||
| Preheat temperature Ts(min) | Ts(min) | 150 | °C | Pb-free reflow, preheat | 2 | ||
| Preheat temperature Ts(max) | Ts(max) | 200 | °C | Pb-free reflow, preheat | 2 | ||
| Preheat time (Min to Max) | ts | 60 | 180 | s | Pb-free reflow, preheat | 2 | |
| Time at reflow temperature | tL | 60 | 150 | s | Pb-free reflow, reflow | 2 | |
| Time within 5°C of actual peak temperature | tp | 10 | 30 | s | Pb-free reflow | 2 | |
| Average ramp-up rate (TL to peak) | 3 | °C/second | Liquidus (TL) to peak | 2 | |||
| TS(max) to TL ramp-up rate | 5 | °C/second | 2 | ||||
| Ramp-down rate | 6 | °C/second | 2 | ||||
| Time 25°C to peak temperature | 8 | minutes | 2 | ||||
| Reflow liquidus temperature (TL) | TL | 217 | °C | Pb-free reflow | 2 | ||
| Nominal ampere rating | 1 | A | 1 | ||||
| Nominal resistance | 0.31 | Ohms | measured with <10% rated current | 1 | |||
| Nominal melting I2t | 0.0593 | A2Sec. | measured at 1 msec. opening time | 1 | |||
| Nominal voltage drop at rated current | 0.351 | V | measured at rated current after temperature has stabilized | 1 | |||
| Nominal power dissipation at rated current | 0.351 | W | at rated current | 1 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | tin | Terminations: Ag / Ni / Sn (100% Lead-free) Element Cover Coating: Lead-free Glass | 3 |
CAD (KiCad official)
- Symbol:
0438001.WR - Footprint:
Fuse:Fuse_0603_1608Metric - 3D model: 0603 (KiCad packages3D, STEP)
- 3D model files:
0438001-wr-etched.step/0438001-wr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);0438001-wr.step/0438001-wr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (3 pp, sha256
052a726ae5f412a4, retrieved 2026-10-17, 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).