component
0437.250WR
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 | 7h ago |
| viewers | 7h ago |
| 0437-250wr-etched.glb | 7h ago |
| 0437-250wr-etched.step | 7h ago |
| 0437-250wr-hero.glb | 7h ago |
| 0437-250wr-hero.overlay.json | 7h ago |
| 0437-250wr.glb | 7h ago |
| 0437-250wr.kicad_mod | 7h ago |
| 0437-250wr.kicad_sym | 7h ago |
| 0437-250wr.lbr | 7h ago |
| 0437-250wr.step | 7h ago |
| package.json | 7h ago |
| page.json | 7h ago |
| README.md | 7h ago |
0437.250WR
Littelfuse · Disposable Fuses · 1206
0437.250WR 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 terminal 1 (Ag/Ni/Sn end termination); non-polarized, 250mA fast-acting, rated 125 V AC/DC with 50 A interrupting rating. |
| 2 | 2 | passive | Fuse terminal 2 (Ag/Ni/Sn end termination); non-polarized, interchangeable with terminal 1, nominal resistance 2.290 ohms. |
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, 100% of ampere rating (250mA-8A) | 4 | hours | 100% of rating, 250mA-8A, at 25ºC | 1 | |||
| Opening time, 350% of ampere rating (250mA-500mA) | 5 | seconds | 350% of rating, 250mA-500mA, at 25ºC | 1 | |||
| Max. voltage rating | 125 | V | Amp code .250 (250mA) row | 1 | |||
| Interrupting rating | 50 | A | @ 125 V AC/DC | 1 | |||
| Continuous operation current | 80 | % rated current | Continuous operation, recommended | 1 | |||
| Nominal resistance | 2.29 | Ohms | Measured with <10% rated current | 1 | |||
| Nominal melting I2t | 0.003 | A2Sec. | 1 | ||||
| Nominal voltage drop at rated current | 0.78 | V | At rated current, after temperature has stabilized | 1 | |||
| Nominal power dissipation at rated current | 0.195 | W | At rated current | 1 | |||
| Reflow preheat temperature min (Ts(min)) | Ts(min) | 150 | ºC | Pb-free reflow, pre-heat | 2 | ||
| Reflow preheat temperature max (Ts(max)) | Ts(max) | 200 | ºC | Pb-free reflow, pre-heat | 2 | ||
| Reflow preheat time (ts) | ts | 60 | 180 | seconds | Pre-heat, Ts(min) to Ts(max) | 2 | |
| Reflow time above liquidus (tL) | tL | 60 | 150 | seconds | Reflow, Pb-free | 2 | |
| Peak temperature (TP) | TP | 260 | ºC | Pb-free reflow; printed as 260+0/-5 °C | 2 | ||
| Time within 5°C of actual peak temperature (tp) | tp | 10 | 30 | seconds | Within 5°C of actual peak temperature | 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 | TS(max) to TL | 2 | |||
| Ramp-down rate | 6 | °C/second | Peak to cooldown | 2 | |||
| Time 25°C to peak temperature | 8 | minutes | 25°C to peak temperature (TP) | 2 | |||
| Maximum soldering temperature | 260 | ºC | Pb-free reflow; 'Do not exceed 260°C' | 2 | |||
| Wave soldering temperature | 260 | ºC | Wave soldering | 2 | |||
| Wave soldering time | 10 | seconds | Wave soldering at 260°C | 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:
0437.250WR - Footprint:
Fuse:Fuse_1206_3216Metric - 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files:
0437-250wr-etched.step/0437-250wr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);0437-250wr.step/0437-250wr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (3 pp, sha256
4118dc56d128f864, retrieved 2026-10-17, 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).