component
0438.250WRA
Public Made by Adomby adom
Littelfuse Disposable Fuses, 0603. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, 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
markdown0438.250WRA
Littelfuse · Disposable Fuses · 0603
0438.250WRA 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 |
|---|---|---|---|---|---|---|---|
| Operating temperature | -55 | 150 | ºC | 1 | |||
| Opening time at 100% of ampere rating | 4 | Hours | at 25ºC, 100% of ampere rating | 1 | |||
| Opening time at 250% of ampere rating | 5 | Seconds | at 25ºC, 250% of ampere rating | 1 | |||
| Max. voltage rating | 63 | VDC | Amp code .250 | 1 | |||
| Continuous operation current derating | 80 | % | continuous operation, percent of rated current | 1 | |||
| Wave soldering temperature | 260 | °C | 10 seconds max | 2 | |||
| Nominal Resistance | 2.218 | Ohms | measured with < 10% rated current | 1 | |||
| Nominal Melting I2t | I2t | 0.0017 | A2Sec. | measured at 1 msec. opening time | 1 | ||
| Nominal Voltage Drop At Rated Current | 0.55 | V | measured at rated current after temperature has stabilized | 1 | |||
| Nominal Power Dissipation At Rated Current | 0.138 | 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:
0438.250WRA - Footprint:
Fuse:Fuse_0603_1608Metric - 3D model: 0603 (KiCad packages3D, STEP)
- 3D model files:
0438-250wra-etched.step/0438-250wra-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);0438-250wra.step/0438-250wra.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (4 pp, sha256
e39993e942f8fa16, retrieved 2026-10-19, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins, primarytwo-terminal convention(convention), consensusoff(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).