NANO
2®
> Very Fast-Acting > 448 Series
Surface Mount Fuses
RoHS
Pb
448 Series Fuse
Description
®
®
PS
E
The lead-free Nano
2
SMF Fuse is a very small, square
surface mount fuse that is RoHS compliant and 100% lead-
free. This product is fully compatible with lead-free solder
alloys and higher temperature profiles associated with
lead-free assembly.
Features
temperature range
Agency Approvals
AGENCY
®
de-rating
AMPERE RANGE
62MA - 15A
62MA - 15A
1A - 10A
AGENCY FILE NUMBER
E10480
®
LR29862
NBK030205
Applications
PS
E
Electrical Characteristics for Series
% of Ampere
Rating
100%
200%
Ampere Rating
1/16 –15
1/16 –10
12 –15
Opening Time
4 hours, Minimum
5 sec., Maximum
20 sec., Maximum
equipment
protection
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/448.html for current information.
39
Revision: May 27, 2008
448 Series
NANO
2®
> Very Fast-Acting > 448 Series
Surface Mount Fuses
Electrical Specifications by Item
Ampere
Rating
(A)
0.062
0.080
0.100
0.125
0.160
0.200
0.250
0.315
0.375
0.400
0.500
0.630
0.750
0.800
1.00
1.25
1.50
1.60
2.00
2.50
3.00
3.15
3.50
4.00
5.00
6.30
7
.00
8.00
10.00
12.00
15.00
Max
Voltage
Rating
(V)
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
65
65
Interrupting
Rating
Nominal Cold
Resistance
(Ohms)
5.50
4.42
2.90
2.58
1.76
1.40
1.05
0.7900
0.7300
0.4895
0.3800
0.2821
0.2475
0.1907
0.08630
0.06619
0.06514
0.06261
0.03529
0.02934
0.02445
0.02300
0.02100
0.01577
0.01531
0.01044
0.00900
0.00780
0.00700
0.00533
0.00394
Nominal
Melting
I
2
t (A
2
sec)
0.00023
0.00043
0.00082
0.00130
0.00280
0.00380
0.01520
0.02650
0.02400
0.04160
0.10000
0.121
0.206
0.272
0.441
0.900
0.900
1.122
0.812
1.156
1.720
1.810
2.300
3.970
4.490
12.10
13.92
18.33
28.00
47
.59
96.10
Agency Approvals
®
®
Amp Code
.062
.080
.100
.125
.160
.200
.250
.315
.375
.400
.500
.630
.750
.800
001.
1.25
01.5
01.6
002.
02.5
003.
3.15
03.5
004.
005.
06.3
007
.
008.
010.
012.
015.
PS
E
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448 Series
40
Revision: May 27, 2008
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/448.html for current information.
NANO
2®
> Very Fast-Acting > 448 Series
Surface Mount Fuses
Temperature Rerating Curve
Average Time Current Curves
.062 A
.080 A
.100 A
.125 A
.160 A
.200 A
.250 A
.315 A
.375 A
.40 A
.50 A
.63 A
.75 A
.80 A
1.00 A
1.25 A
1.50 A
1.60 A
2.00 A
2.50 A
3.00 A
3.15 A
3.50 A
4.00 A
5.00
A
6.30 A
7A
8A
10 A
12 A
15 A
100
10
TIME IN SECONDS
1
0.1
0.01
0.001
0.1
1
10
100
1000
CURRENT IN AMPS
Soldering Parameters
Reflow Condition
- Temperature Min (T
s(min)
)
Pre Heat
- Temperature Max (T
s(max)
)
- Time (Min to Max) (t
s
)
Average ramp up rate (Liquidus Temp
(T
L
) to peak
T
S(max)
to T
L
- Ramp-up Rate
Reflow
- Temperature (T
L
) (Liquidus)
- Temperature (t
L
)
60 – 90 seconds
250
+0/-5
20 – 40 seconds
60 – 120 secs
Peak Temperature (T
P
)
Time within 5°C of actual peak
Temperature (t
p
)
Ramp-down Rate
Time 25°C to peak Temperature (T
P
)
Do not exceed
Wave Soldering Parameters
8 minutes Max.
Temperature, 3
seconds max
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/448.html for current information.
41
Revision: May 27, 2008
448 Series
NANO
2®
> Very Fast-Acting > 448 Series
Surface Mount Fuses
Product Characteristics
Materials
Product Marking
Operating
Temperature
Moisture Sensitivity
Level
Solderability
Insulation
Resistance (after
Opening)
Moisture Resistance
Salt Spray
Resistance to Soldering
Heat
o
Thermal Shock
125
-55
o
o
o
o
Mechanical Shock
sawtooth wave 6ms duration, 3
Vibration
Dimensions
6.10
(.240")
F
2.69
(.106")
2.69
(.106")
Part Numbering System
0448 001. M R
SERIES
AMP Code
Refer to Electrical charac-
teristics table
M = 2500 pcs
N = 5000 pcs
7A
1.45
(.057")
6.86
(.270")
3.15
(.124")
2.95
(.116")
QUANTITY Code
PACKAGING Code
R = Tape and Reel
Example:
1.5 amp product is
04671.5NRHF (2 amp
1.96
(.077")
Recommended pad layout
Packaging
Packaging Option
12mm Tape and Reel
Packaging Specification
Quantity
1000
Quantity &
Packaging Code
MR
448 Series
42
Revision: May 27, 2008
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/448.html for current information.
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