268
Surface Mount Fuses
www.littelfuse.com
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
12–15 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:
–55°C to 125°C.
Shock: MIL-STD-202, Method 213, Test Condition I
(100 G’s peak for 6 milliseconds).
Vibration: MIL-STD-202, Method 201 (10–55 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 260°C).
Thermal Shock: MIL-STD-202, Method 107,
Test Condition B (–65 to 125°C).
Moisture Resistance: MIL-STD-202, Method 106, High Humidity
(90-98 RH), Heat (65°C).
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 — 260°C, 10 seconds maximum
Reflow Solder — 260°C, 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
