component
0437003.WR
Public Made by Adomby adom
Littelfuse Disposable Fuses, 1206. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
Generated by kicad-footprint-generator · KiCad file format 20260206
| Name | Last updated |
|---|---|
| docs | 4d ago |
| viewers | 4d ago |
| 0437003-wr-etched.glb | 4d ago |
| 0437003-wr-etched.step | 4d ago |
| 0437003-wr-hero.glb | 4d ago |
| 0437003-wr-hero.overlay.json | 4d ago |
| 0437003-wr.glb | 4d ago |
| 0437003-wr.kicad_mod | 4d ago |
| 0437003-wr.kicad_sym | 4d ago |
| 0437003-wr.lbr | 4d ago |
| 0437003-wr.step | 4d ago |
| package.json | 4d ago |
| page.json | 4d ago |
| README.md | 4d ago |
0437003.WR
Littelfuse · Disposable Fuses · 1206
0437003.WR 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 | One of two interchangeable Ag/Ni/Sn end terminations of the 3A (amp code 003.) fast-acting fuse, rated 32 V AC / 35 V DC with 50 A interrupting rating and 0.033 ohm nominal resistance. |
| 2 | 2 | passive | Second interchangeable Ag/Ni/Sn end termination of the 3A (amp code 003.) fast-acting fuse, rated 32 V AC / 35 V DC with 50 A interrupting rating and 0.033 ohm nominal resistance. |
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 |
|---|---|---|---|---|---|---|---|
| Opening time at 100% of ampere rating (250mA-8A) | 4 | hours | 100% of rated current (3A for this MPN), opening time at 25ºC | 1 | |||
| Opening time at 250% of ampere rating (750mA-8A) | 5 | s | 250% of rated current, 750mA-8A ratings, opening time at 25ºC | 1 | |||
| Opening time at 350% of ampere rating (750mA-8A) | 1 | s | 350% of rated current, 750mA-8A ratings, opening time at 25ºC | 1 | |||
| Max. voltage rating | 32 | V | Amp code 003. (3A) row | 1 | |||
| Interrupting rating | 50 | A | Printed as 50 A @ 32 V AC/35 V DC; AC tested at rated voltage with unity power factor, DC with time constant < 0.8 msec | 1 | |||
| Nominal resistance | 0.033 | Ohms | Measured with < 10% rated current | 1 | |||
| Nominal melting I2t | 0.506 | A2Sec. | 1 | ||||
| Nominal voltage drop at rated current | 0.14 | V | At rated current after temperature has stabilized | 1 | |||
| Nominal power dissipation at rated current | 0.42 | W | At rated current | 1 | |||
| Operating temperature | -55 | 150 | ºC | Operating temperature range | 1 | ||
| Continuous operating current | 80 | % of rated current | Continuous operation; standard 20% re-rating for continuous operation applies on top of the temperature re-rating curve | 1 | |||
| Preheat temperature Ts(min) | Ts(min) | 150 | °C | Reflow, Pb-free assembly, preheat | 2 | ||
| Preheat temperature Ts(max) | Ts(max) | 200 | °C | Reflow, Pb-free assembly, preheat | 2 | ||
| Preheat time (Ts min to max) | ts | 60 | 180 | seconds | Reflow, Pb-free assembly, preheat from Ts(min) to Ts(max) | 2 | |
| Average ramp-up rate (TL to peak) | 3 | °C/second | Reflow, Pb-free assembly, from liquidus temperature TL to peak | 2 | |||
| Ramp-up rate TS(max) to TL | 5 | °C/second | Reflow, Pb-free assembly | 2 | |||
| Time at liquidus temperature (tL) | tL | 60 | 150 | seconds | Reflow, Pb-free assembly, at TL 217°C | 2 | |
| Peak temperature (TP) | TP | 260 | °C | Reflow, Pb-free assembly; printed 260+0/-5 °C; do not exceed 260°C | 2 | ||
| Time within 5°C of actual peak temperature (tp) | tp | 10 | 30 | seconds | Reflow, Pb-free assembly | 2 | |
| Ramp-down rate | 6 | °C/second | Reflow, Pb-free assembly | 2 | |||
| Time 25°C to peak temperature | 8 | minutes | Reflow, from 25°C to peak temperature TP | 2 | |||
| Wave soldering temperature | 260 | °C | Wave soldering | 2 | |||
| Wave soldering time | 10 | seconds | Wave soldering | 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 | 3 |
CAD (KiCad official)
- Symbol:
0437003.WR - Footprint:
Fuse:Fuse_1206_3216Metric - 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files:
0437003-wr-etched.step/0437003-wr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);0437003-wr.step/0437003-wr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (3 pp, sha256
c2236d59abc0fa90, retrieved 2026-10-16, 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).