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043702.5WR

Public Made by Adom

by adom

Littelfuse Disposable Fuses, 1206. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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043702.5WR

Littelfuse · Disposable Fuses · 1206

043702.5WR from Littelfuse, in a 1206. 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 at one end of the ceramic body (Ag/Ni/Sn); the 437 Series is a non-polarized 2-terminal part rated 2.5 A, 45 V AC / 63 V DC.
2 2 passive Fuse termination at the opposite end of the ceramic body (Ag/Ni/Sn); interchangeable with the other terminal, with the marking code facing up when mounted.

Key specifications

Parameter Value
Manufacturer Littelfuse
Package 1206
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; 250mA-8A range 1
Opening time at 250% of ampere rating 5 seconds at 25ºC; 250% of ampere rating; 750mA-8A range 1
Opening time at 350% of ampere rating 1 seconds at 25ºC; 350% of ampere rating; 750mA-8A range 1
Continuous operation current 80 % of rated current devices operated continuously 1
Max. Voltage Rating 45 V 2.5 A row of Electrical Specifications table 1
Interrupting Rating 50 A @ 45 V AC/63 V DC 1
Time within 5ºC of peak temperature tp 10 30 seconds within 5ºC of actual peak temperature 2
Time 25ºC to peak temperature 8 minutes 25ºC to peak temperature 2
Ramp-down rate 6 ºC/second from peak temperature 2
Average ramp-up rate (TL to peak) 3 ºC/second liquidus temp (TL) to peak 2
TS(max) to TL ramp-up rate 5 ºC/second TS(max) to TL 2
Pre-heat temperature (TS) TS 150 200 ºC Pb-free reflow pre-heat 2
Pre-heat time (ts) ts 60 180 seconds Min to max pre-heat 2
Time above liquidus (tL) tL 60 150 seconds Reflow at liquidus temperature TL 2
Wave soldering temperature 260 ºC wave soldering 2
Wave soldering time 10 seconds wave soldering at 260ºC 2
Nominal Resistance 0.043 Ohms measured with <10% rated current 1
Nominal Melting I2t I2t 0.441 A2 Sec. 2.5 A row 1
Nominal Voltage Drop At Rated Current 0.15 V measured at rated current after temperature has stabilized 1
Nominal Power Dissipation At Rated Current 0.375 W at rated current 1
Ampere Rating 2.5 A Amp code 02.5 1
Reflow Liquidus Temperature (TL) TL 217 ºC Pb-free reflow liquidus 2

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: Ceramic/Lead-free Glass 3

CAD (KiCad official)

  • Symbol: 043702.5WR
  • Footprint: Fuse:Fuse_1206_3216Metric
  • 3D model: 1206 (KiCad packages3D, STEP)
  • 3D model files: 043702-5wr-etched.step / 043702-5wr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 043702-5wr.step / 043702-5wr.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Littelfuse datasheet (3 pp, sha256 33741d87af7e5765, retrieved 2026-10-19, 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