Littelfuse 449 Series User Manual
Surface mount fuses, 449 series fuse, Nano
© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 01/23/14
Surface Mount Fuses
NANO
2®
> Slo-Blo
®
> 449 Series
449 Series Fuse
Description
The lead free NANO
2
Slo-Blo
®
fuse is RoHS compliant,
Halogen Free and 100% lead-free. This product is fully
compatible with lead-free solder alloys and higher
temperature profiles associated with lead-free assembly.
The Slo-Blo
®
design has enhanced inrush withstand
characteristics over the NANO
2
Fast-Acting Fuse. The unique
time delay feature of this fuse design helps solve the
problem of nuisance “opening” by accommodating inrush
currents that normally cause a fast-acting fuse to open.
Agency Approvals
Agency
Agency File number
Ampere rAnge
e10480
375mA - 5A
PS
E
nbK030205
1A - 5A
Electrical Characteristics for Series
Features
% of Ampere
rating
Opening Time
100%
4 hours, Minimum
200%
1 sec., Min.; 60 sec., Max.
300%
0.2 sec., Min.; 3 sec., Max
800%
0.02 sec., Min.; 0.1 sec., Max.
Electrical Specifications by Item
Ampere
rating
(A)
Amp code
max
Voltage
rating
(V)
interrupting
rating
nominal cold
resistance
(Ohms)
nominal
melting
i
2
t (A
2
sec)
Agency Approvals
0.375
.375
125
50 amperes @125 VAC/
VDC
PSE: 100 amperes
@100 VAC
1.5130
0.088
x
0.500
.500
125
0.7633
0.258
x
0.750
.750
125
0.4080
0.847
x
1.00
001.
125
0.2516
1.76
x
x
1.50
01.5
125
0.1186
4.70
x
x
2.00
002.
125
0.0708
6.76
x
x
2.50
02.5
125
0.0400
13.18
x
x
3.00
003.
125
0.0352
19.55
x
x
3.50
03.5
125
0.0261
32.70
x
x
4.00
004.
125
0.0227
40.80
x
x
5.00
005.
125
0.0171
59.59
x
x
Applications
• Notebook PC
• LCD/PDP TV
• LCD monitor
• LCD/PDP panel
• LCD backlight inverter
• Portable DVD player
• Power supply
• Networking
• PC server
• Cooling fan system
• Storage system
• Telecom system
• Wireless basestation
• White goods
• Game console
• Office Automation
equipment
• Battery charging circuit
protection
• Industrial equipment
• Medical equipment
• Automotive
Secondary protection for space constrained applications:
• Lead-free and Halogen
Free
• Slo-Blo
®
• Small size
• Wide range of current
ratings available
• Wide operating
temperature range
• Low temperature
de-rating
PS
E
PS
E
Notes: - l
2
t calculated at 8ms. Resistance is measured at 10% of rated current, 25ºC
Additional Information