268
Surface Mount Fuses
w w w . l i t t e l f u s e . c o m
Subminiature Surface Mount
NANO
2
FUSE
Very Fast-Acting 451/453 Series
The Nano
2
SMF
Fuse is a very small, square surface mount fuse that is
also available in a surface mount holder.
ELECTRICAL CHARACTERISTICS:
% of Ampere
Ampere
Opening
Rating
Rating
Time
100%
1/16 15
4 hours, Minimum
200%
1/16 10
5 seconds, Maximum
1215
20 seconds, Maximum
AGENCY APPROVALS:
Recognized under the Components Program
of Underwriters Laboratories and Certified by CSA. Approved by METI
from 1 through 5 amperes.
AGENCY FILE NUMBERS:
UL E10480, CSA LR 29862.
INTERRUPTING RATINGS:
1/16 8A
50 amperes at 125 VAC/VDC
300 amperes at 32 VDC
10A
35 amperes at 125 VAC/50 amperes at 125 VDC
300 amperes at 32 VDC
12A 15A 50 amperes at 65 VAC/VDC
300 amperes at 24 VDC
ENVIRONMENTAL SPECIFICATIONS:
Operating Temperature:
55C to 125C.
Shock:
MIL-STD-202, Method 213, Test Condition I
(100 G's peak for 6 milliseconds).
Vibration:
MIL-STD-202, Method 201 (1055 Hz).
Salt Spray:
MIL-STD-202, Method 101, Test Condition B.
Insulation Resistance (After Opening):
MIL-STD-202, Method
302, Test Condition A, (10,000 ohms minimum).
Resistance to Soldering Heat:
MIL-STD-202,
Method 210, Test Condition B (10 sec. at 260C).
Thermal Shock:
MIL-STD-202, Method 107,
Test Condition B (65 to 125C).
Moisture Resistance:
MIL-STD-202, Method 106, High Humidity
(90-98 RH), Heat (65C).
100
10
1
0.1
0.01
0.001
1/16A
1/8A
1/4A
3/8A
1/2A 3/4A
1A
1 1/2A
2A 2 1/2A
3A 3 1/2A 4A
5A 7A
10A 12A 15A
0.05 0.1
1
10
100
1000
TIME IN SECONDS
CURRENT IN AMPERES
Average Time Current Curves
F
7 A
6.86
(.270")
3.15
(.124")
2.95
(.116")
1.96
(.077")
2.69
(.106")
2.69
(.106")
1.45
(.057")
6.10
(.240")
Recommended pad layout
Tin-Lead
Silver
Nominal
Nominal
Plated
Plated
Ampere
Voltage
Resistance
Melting I
2
t
Catalog #
Catalog #
Rating
Rating
Cold Ohms
A
2
Sec.
R451.062
0.062
125
5.50
0.00019
R451.080
0.080
125
4.05
0.00033
R451.100
0.100
125
3.10
0.00138
R451.125
0.125
125
1.70
0.00286
R451.160
0453.160
0.160
125
1.80
0.00306
R451.200
0453.200
0.200
125
1.40
0.00652
R451.250
0453.250
0.250
125
1.05
0.01126
R451.315
0453.315
0.315
125
0.78
0.0231
R451.375
0453.375
0.375
125
0.610
0.0425
R451.400
0453.400
0.400
125
0.560
0.0484
R451.500
0453.500
0.500
125
0.420
0.0795
R451.630
0453.630
0.630
125
0.305
0.143
R451.750
0453.750
0.750
125
0.245
0.185
R451.800
0453.800
0.800
125
0.212
0.271
R451 001.
0453 001.
1.0
125
0.153
0.459
R451 1.25
0453 1.25
1.25
125
0.0780
0.664
R451 01.5
0453 01.5
1.5
125
0.0630
0.853
R451 01.6
0453 01.6
1.6
125
0.0580
1.060
R451 002.
0453 002.
2.0
125
0.0367
0.530
R451 02.5
0453 02.5
2.5
125
0.0286
1.029
R451 003.
0453 003.
3.0
125
0.0227
1.650
R451 3.15
0453 3.15
3.15
125
0.0215
1.920
R451 03.5
0453 03.5
3.5
125
0.0200
2.469
R451 004.
0453 004.
4
125
0.0160
3.152
R451 005.
0453 005.
5
125
0.0125
5.566
R451 06.3
0453 06.3
6.3
125
0.0096
9.17
R451 007.
0453 007.
7
125
0.0090
10.32
R451 008.
0453 008.
8
125
0.0077
20.23
R451 010.
0453 010.
10
125
0.0056
26.46
R451 012.
0453 012.
12
65
0.0049
47.97
R451 015.
0453 015.
15
65
0.0037
97.82
PHYSICAL SPECIFICATIONS:
Materials:
Body: Ceramic
Terminations: Tin-Lead Alloy or Silver Plated Caps.
Soldering Parameters:
Wave Solder -- 260C, 10 seconds maximum
Reflow Solder -- 260C, 30 seconds maximum
Solderability:
MIL-STD-202, Method 208.
PACKAGING SPECIFICATIONS:
12mm Tape and Reel per EIA-
RS481-1 (IEC 286, part 3); 1,000 per reel, add packaging suffix, MR;
5,000 per reel, add packaging suffix NR.
PATENTED
Refer to pg. 271 for SMF Omni-Blok
Holder, Series 154 000.
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