component
MF-USML500
Public Made by Adomby adom
BOURNS Resettable Fuses, 1210. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, 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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README
markdownMF-USML500
BOURNS · Resettable Fuses · 1210
MF-USML500 from BOURNS, in a 1210. 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 | Terminal 1 of an unpolarised fuse; either orientation. |
| 2 | 2 | passive | Terminal 2 of an unpolarised fuse; either orientation. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | BOURNS |
| Package | 1210 |
| 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 |
|---|---|---|---|---|---|---|---|
| Resistance | R | 0.001 | 0.012 | Ω | In still air at 23 °C (Rmin / R1max) | 1 | |
| Maximum time to trip | 2 | s | At 25 A | 1 | |||
| Maximum interrupt current | Imax | 50 | A | 1 | |||
| Resistance change after passive aging | ΔR/R | -10 | 10 | % | +85 °C, 1000 hours (typical) | 1 | |
| Resistance change after humidity aging | ΔR/R | -15 | 15 | % | +85 °C, 85 % R.H., 100 hours (typical) | 1 | |
| Resistance change after thermal shock | ΔR/R | -30 | 30 | % | -40 °C to +85 °C, 20 times (typical) | 1 | |
| Hold current | Ihold | 5 | A | at 23 °C | 1 | ||
| Trip current | Itrip | 10 | A | at 23 °C | 1 | ||
| Tripped power dissipation | 1.2 | W | at 23 °C | 1 | |||
| Operating temperature | TA | -40 | 85 | °C | 1 | ||
| Storage temperature before opening | 40 | °C | Before opening, 70 % RH max | 1 |
CAD (KiCad official)
- Symbol:
MF-USML500 - Footprint:
Fuse:Fuse_1210_3225Metric - 3D model: 1210 (KiCad packages3D, STEP)
- 3D model files:
mf-usml500-etched.step/mf-usml500-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mf-usml500.step/mf-usml500.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: BOURNS datasheet (7 pp, sha256
86b60882e1aa972e, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins, primarytwo-terminal convention(convention), consensusoff(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).