component
0438004.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
markdown0438004.WR
Littelfuse · Disposable Fuses · 0603
0438004.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 terminal 1 (non-polarized, Ag/Ni/Sn termination); 4A rating (amp code 004.), 32V max voltage rating, 50A @ 32VDC/12VAC interrupting rating. |
| 2 | 2 | passive | Fuse terminal 2 (non-polarized, Ag/Ni/Sn termination); 4A rating (amp code 004.), 32V max voltage rating, 50A @ 32VDC/12VAC interrupting rating. |
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 | 100% of ampere rating, at 25ºC | 1 | |||
| Opening time at 250% of ampere rating | 5 | Seconds | 250% of ampere rating, at 25ºC | 1 | |||
| Max. voltage rating | 32 | VDC | Amp code 004 (4 A) row | 1 | |||
| Interrupting rating | 50 | A | 50A @ 32VDC/12VAC, tested at rated voltage (note 1) | 1 | |||
| Operating temperature | -55 | 150 | ºC | 1 | |||
| Continuous operation current | 80 | % of rated current | Recommended for continuous operation | 1 | |||
| Nominal resistance | 0.017 | Ohms | Measured with <10% rated current | 1 | |||
| Nominal melting I2t | 0.692 | A2Sec. | Measured at 1 msec. opening time | 1 | |||
| Nominal voltage drop at rated current | 0.079 | V | Measured at rated current after temperature has stabilized | 1 | |||
| Nominal power dissipation at rated current | 0.316 | 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:
0438004.WR - Footprint:
Fuse:Fuse_0603_1608Metric - 3D model: 0603 (KiCad packages3D, STEP)
- 3D model files:
0438004-wr-etched.step/0438004-wr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);0438004-wr.step/0438004-wr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (3 pp, sha256
a9efab228ef1992a, 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).