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Littelfuse 045803.5DR 3.5 A 458 inrush-withstand SMD Fuse
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pLittelfuse 045803.5DR — NTC inrush current limiter./p
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Littelfuse 045803.5DR 3.5 A 458 inrush-withstand SMD Fuse
Littelfuse 045803.5DR 3.5 A 458 inrush-withstand SMD Fuse belongs to the Littelfuse range. It holds 0.0375 ohm at 25 °C.
Technical Data
| Parameter | Rating |
|---|---|
| Parameter | Value |
| Manufacturer / Series | Littelfuse / 458 Series |
| Part number | 045803.5DR |
| Fuse characteristic | inrush-withstand |
| Rated current | 3.5 A |
| Voltage rating | 75 VDC / 48 VAC (32 VAC from 4 A) |
| Interrupting rating | 50 A at the applicable AC/DC rating |
| Nominal cold resistance | 0.0375 Ω |
| Nominal melting I²t | 4.00 A²s |
| Package | 1206 / 3216 NANO2 wire-in-air |
| Operating temperature | -55 °C to +125 °C |
| Agency / environmental | UL Recognized, RoHS compliant, halogen-free and lead-free assembly compatible |
Design Notes
- Limits capacitor and transformer inrush by dropping resistance as it heats.
- It does not interrupt a fault — pair it with a fuse or breaker upstream.
- Leave cooling time between power cycles so the disk returns to high resistance.
- Resistance at 25 °C sets the cold-start limiting; the hot value is far lower.
- A disk rated for a higher steady current runs cooler at the same load.
Where It Is Used
Typical places this thermistor turns up:
- battery
- EV
- telecom
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