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0438001.WR

Public Made by Adom

by adom

Littelfuse Disposable Fuses, 0603. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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0438001.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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 0438001-wr.step / 0438001-wr.glb are 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, primary claude-sonnet-5-5 (text+vision), consensus claude-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).

Datasheet PDF