Fuse Datasheet
451/453 Series
Very Fast-Acting Fuse
RoHS
PS
E
Description
The Nano2® SMF Fuse is a very small, Wire-in-Air (WIA) square
shape surface mount fuse that was designed for secondary side
circuit over-current protection applications. These fuses are
designed for PCB using surface mount technology.
Features & Benefits
■ UL Listed and Recognized to
UL/CSA/NMX UL 248-1 and
UL/CSA/NMX UL 248-14 (see
Agency Approvals)
■ Very fast-acting
■ Small size
■ Wide range of current rating
available
(0.062A to 20A)
■ Conforms to DENAN’s
Appendix 3
■ Wide operating temperature
range
■ Conforms to IEC/EN 60127-1
and IEC/EN 60127-7
■ RoHS compliant and Halogen
Free
Additional Information
Applications
Resources
451 Series
Resources
453 Series
Accessories
451 Series
Accessories
453 Series
Samples
451 Series
Samples
453 Series
■ Notebook PC
■ Storage system
■ LCD/PDP TV
■ Telecom system
■ LCD monitor
■ Wireless basestation
■ LCD/PDP panel
■ White goods
■ LCD backlight inverter
■ Game console
■ Portable DVD player
■ Office Automation equipment
■ Power supply
■ Networking
■ Battery charging circuit
protection
■ PC server
■ Industrial equipment
■ Cooling fan system
Agency Approvals
Electrical Characteristics for Series
% of Ampere Rating
Ampere Rating
Opening Time
100%
0.062 – 20
4 hours, Minimum
0.062 – 10
5 sec., Maximum
12 – 20
20 sec., Maximum
200%
Agency
PS
E
1
Agency File Number
Ampere Range
E10480
6.3A - 20A
29862
0.062A - 15A
J50446731
1A, 1.25A, 2A, 2.5A,
3.15A, 4A, 5A, 7A,
8A, 10A, 12A, 20A
NBK030205-E10480A
NBK030205-E10480B
NBK101105-E184655
1A-1.6A
2A-5A
6.3A - 10A
E10480
0.062A - 5A
NA
1A, 1.25A, 2A, 2.5A,
3.15A, 4A, 5A, 7A,
8A, 10A, 12A, 20A
© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 08/23/21
Fuse Datasheet
451/453 Series
Very Fast-Acting Fuse
Electrical Specifications by Item
Ampere
Rating
(A)
Amp Code
Max
Voltage
Rating
(V)
.062
.080
.100
.125
.160
.200
.250
.315
.375
.400
.500
.630
.750
.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
.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.
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
10.0
010.
125
12.0
15.0
20.0
012.
015.
020.
65
65
65
Interrupting
Rating
50A @125VAC/VDC
300A @32VDC
PSE: 100A @100VAC
50A @125VAC/VDC
10,000A @75VDC
300A @32VDC
PSE: 100A @100VAC
50A @125VAC/VDC
400A @32VDC
PSE: 100A @100VAC
35A @125 VAC/
50A @125 VDC
400A @32 VDC
PSE: 100A @100VAC
150A @65VDC
100A @65VAC
400A @32VDC
Agency Approvals
Nominal Cold
Resistance
(Ohms)
Nominal
Melting
I2t (A2sec)
5.5000
4.0500
3.1000
1.7000
1.2157
0.8372
0.5765
0.3918
0.4541
0.4233
0.3046
0.2022
0.1444
0.1355
0.0780
0.0780
0.0630
0.0580
0.0367
0.0286
0.0227
0.0215
0.0200
0.0160
0.0125
0.0096
0.0090
0.0077
0.00019
0.00033
0.00138
0.00286
0.0048
0.0089
0.0158
0.0311
0.0442
0.0551
0.0824
0.1381
0.2143
0.2654
0.6029
0.664
0.853
1.060
0.530
1.029
1.650
1.920
2.469
3.152
5.566
9.170
10.32
20.23
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0.0056
26.46
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-
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0.0049
0.0037
0.00244
47.97
97.82
154
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-
-
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x
PS
E
Notes:
- l2t calculated at 8ms.
- Resistance is measured at 10% of rated current, 25ºC
2
© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 08/23/21
Fuse Datasheet
451/453 Series
Very Fast-Acting Fuse
Average
Current
Fast Time
Acting Series
TC Curve Curves
62mA
80mA
100mA
125mA
160mA
200mA
250mA
315mA
375mA
400mA
500mA
630mA
750mA
800mA
1A
1.25A
1.5A
1.6A
2A
2.5A
3A
3.15A
3.5A
4A
5A
6.3A
7A
8A
10A
12A
15A
20A
Temperature Re-rating Curve
100
10
TIME IN SECONDS
1
Note:
1. Rerating depicted in this curve is in addition to the standard derating of 25% for continuous operation.
0.1
0.01
0.001
0.01
0.1
1
10
100
1000
10000
CURRENT IN AMPS
Soldering Parameters
Pb – Free assembly
Reflow Condition
Pre Heat
- Temperature Min (Ts(min))
150°C
- Temperature Max (Ts(max))
200°C
- Time (Min to Max) (ts)
60 – 180 secs
Reflow
217°C
- Temperature (tL)
60 – 150 seconds
Peak Temperature (TP)
260+0/–5 °C
Time within 5°C of actual peak Temperature (tp)
20 – 40 seconds
Ramp-down Rate
5°C/second max.
Time 25°C to peak Temperature (TP)
8 minutes max.
Do not exceed
260°C
Wave Soldering Parameters
Temperature
5°C/second max.
- Temperature (TL) (Liquidus)
Critical Zone
TL to TP
Ramp-up
TL
TS(max)
Average ramp up rate (Liquidus Temp (TL) to peak 5°C/second max.
TS(max) to TL - Ramp-up Rate
tP
TP
tL
Ramp-down
TS(min)
25
Preheat
tS
time to peak temperature
(t 25ºC to peak)
Time
260°C Peak Temperature, 10 seconds
max.
3
© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 08/23/21
Fuse Datasheet
451/453 Series
Very Fast-Acting Fuse
Product Characteristics
Body: Ceramic
Terminations:
Gold-Plated Caps / Sn-dipped Silver Plated
Caps (451 RoHS/HF series)
Silver-plated Caps (451MR RoHS ratings
below 375mA and 453 RoHS Series)
Materials
Thermal Shock
MIL-STD-202, Method 107, Test
Condition B, 5 cycles, -65°C /
+125°C, 15 minutes @ each extreme
Mechanical Shock
MIL-STD-202, Method 213, Test I:
Deenergized. 100G’s pk amplitude,
sawtooth wave 6ms duration, 3
cycles XYZ+xyz = 18 shocks
Vibration
MIL-STD-202, Method 201: 0.03”
amplitude, 10-55 Hz in 1 min. 2hrs
each XYZ=6hrs
Product Marking
Brand, Ampere Rating
Operating Temperature
–55°C to 125°C
Moisture Sensitivity Level
Level 1, J-STD-020
Solderability
MIL-STD-202, Method 208
Moisture Resistance
MIL-STD-202, Method 106, 10 cycles
Insulation Resistance
(after Opening)
MIL-STD-202, Method 302, Test
Condition A (10,000 ohms minimum)
Salt Spray
MIL-STD-202, Method 101, Test
Condition B (48hrs)
Resistance to Soldering Heat
MIL-STD-202, Method 210, Test
condition B (10 sec at 260°C)
Dimensions
6.10 ± .20
(.240")
F
7A
Part Numbering System
0451
2.69 ± .25
(.106")
R L
Series
451 = Gold / Sn-dipped Silver Plated Caps
453 = Silver Plated Caps
2.69 ± .25
(.106")
1.45
(.057")
Amp Code
Refer to Electrical
characteristics table
6.86
(.270")
1.96
(.077")
001. M
3.15
(.124")
Quantity code
M = 1000 pcs
N = 5000 pcs
2.95
(.116")
Packaging code
R = Tape and Reel
L-RoHS Compliant & Halogen Free
(Gold Plated Caps)
Recommended pad layout
SN-RoHS Compliant & Halogen Free
(Sn-dipped Caps)
Note: “L” suffix applies to 451 series only
- 453 series is available only as RoHS compliant version and does not require “L” suffix. Please do not include “L” suffix within
453 series ordering instructions.
Packaging
Packaging Option
Packaging Specification
Quantity
Quantity &
Packaging Code
12mm Tape and Reel
EIA RS-481-2 (IEC 286, part 3)
5000
NR
12mm Tape and Reel
EIA RS-481-2 (IEC 286, part 3)
1000
MR
Disclaimer Notice - Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications,
devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth
in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable
for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and
Conditions of Sale, unless otherwise agreed by Littelfuse. Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own
applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics.
4
© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 08/23/21
