Surface Mount Fuses
NANO
2®
> Slo-Blo
®
> 452/454 Series
452/454 Series Fuse
Description
PS
E
The NANO
2
Slo-Blo
®
fuse 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.
Features
• Time-Lag (Slo-Blo)
• Small size
• Wide range of current
rating available (375mA
to 12A)
• Wide operating
temperature range
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
• Low temperature
de-rating
• RoHS compliant
• Halogen Free
Agency Approvals
AgeNCy
AgeNCy FIle NuMbeR
e10480
lR29862
PS
E
AMpeRe RANge
375mA - 12A
375mA - 12A
1A - 5A
NbK030205-e10480b
Electrical Characteristics for Series
% of Ampere
Rating
100%
200%
300%
800%
Opening Time
4 hours, Minimum
1 sec., Min.; 60 sec., Max.
0.2 sec., Min.; 3 sec., Max
0.02 sec., Min.; 0.1 sec., Max.
Electrical Specifications by Item
Ampere
Rating
(A)
0.375
0.500
0.750
001.
1.50
2.00
2.50
3.00
3.50
4.00
5.00
7
.00
8
12
Amp Code
.375
.500
.750
001.
01.5
002.
02.5
003.
03.5
004.
005.
007
.
008.
012.
Max
Voltage
Rating
(V)
125
125
125
125
125
125
125
125
125
125
125
72
72
72
50 amperes @ 72 VAC
50 amperes @ 60 VDC
50 amperes @ 72 VAC
50 amperes @ 60 VDC
50 amperes @ 125 VAC/VDC
300 amperes @ 32 VDC
PSE: 100 amperes @ 100 VAC
Interrupting
Rating
Nominal Cold
Resistance
(Ohms)
1.2000
0.7000
0.3600
0.2250
0.0930
0.0625
0.0450
0.0340
0.0224
0.0186
0.0136
0.0105
0.0088
0.0061
Nominal
Melting
I
2
t (A
2
sec)
0.101
0.240
0.904
1.98
3.65
8.20
15.0
20.16
26.53
34.40
53.72
123.83
137
.34
260.46
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Agency Approvals
PS
E
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Notes:
- l
2
t calculated at 8ms.
- Resistance is measured at 10% of rated current, 25ºC
© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 05/21/14
Surface Mount Fuses
NANO
2®
> Slo-Blo
®
> 452/454 Series
Temperature Rerating Curve
Average Time Current Curves
3.00A
2.50A
2.00A
1.50A
1.00A
750mA
500mA
375mA
12.0A
8.00A
7.00A
5.00A
4.00A
3.50A
100
TIME IN SECONDS
Note:
1. Derating depicted in this curve is in addition to the standard derating of 25% for
continuous operation.
10
1
0.1
0.01
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
)
Pb – Free assembly
150°C
60 – 120 secs
5°C/second max.
5°C/second max.
217°C
60 – 90 seconds
260
+0/–5
T
P
T
L
Temperature
t
P
Ramp-up
Critical Zone
T
L
to T
P
200°C
T
S(max)
T
S(min)
Preheat
t
L
Ramp-down
t
S
25
time to peak temperature
(t 25ºC to peak)
Time
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
°C
20 – 40 seconds
5°C/second max.
8 minutes max.
260°C
260°C Peak
Temperature,
3 seconds max.
© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 05/21/14
Surface Mount Fuses
NANO
2®
> Slo-Blo
®
> 452/454 Series
Product Characteristics
Body: Ceramic
Terminations:
Gold-plated Caps / Sn-dipped
Silver Plated
Caps (452 Series)
Silver-plated Caps (454 Series)
Brand, Ampere Rating
-55°C to 125°C
Level 1, J-STD-020C
MIL-STD-202, Method 208
MIL-STD-202, Method 302, Test Condition
A (10,000 ohms minimum)
Thermal Shock
MIL
-STD-202, Method 107
, Test
Condition B, 5 cycles, -65°C /
+125°C, 15 minutes @ each extreme
MIL
-STD-202, Method 213, Test I:
Deenergized. 100G’s pk amplitude,
sawtooth wave 6ms duration, 3
cycles XYZ+xyz = 18 shocks
MIL
-STD-202, Method 201: 0.03”
amplitude, 10-55 Hz in 1 min. 2hrs
each XYZ=6hrs
MIL
-STD-202, Method 106, 10 cycles
MIL
-STD-202, Method 101, Test
Condition B (48hrs)
MIL
-STD-202, Method 210, Test
condition B (10 sec at 260°C)
Materials
Mechanical Shock
Product Marking
Operating
Temperature
Moisture
Sensitivity Level
Solderability
Insulation
Resistance (after
Opening)
Vibration
Moisture Resistance
Salt Spray
Resistance to Soldering
Heat
Dimensions
2.69 ± .25
(.106")
2.69 ± .25
(.106")
Part Numbering System
0452 001. M R L
6.10 ± .20
(.240")
F
SERIES
AMP Code
Refer to Amp Code column in the
Electrical Specifications table.
The dot is positioned at the end of the
number sequence with whole ratings
and within for fractional ratings.
Example: 0.375 Amp product is
0452.375MRL (1 amp product shown)
T
1A
1.45
(.057")
6.86
(.270")
3.15
(.124")
2.95
(.116")
QuANTITy Code
M = 1000 pcs
N = 5000 pcs
PACkAgINg Code
R = Tape and Reel
L - RoHS Compliant & Halogen Free
(gold Plated Caps)
SN-RoHS Compliant & Halogen Free
(Sn-dipped Caps)
Notes:
452 series may be ordered as either “RoHS and HF (Gold Plated Caps)” (“L
” suffix) or
non-RoHS (no suffix) version.
454 series is available only as “RoHS and HF” version and does not require “L
” suffix.
Please do not include “L
” suffix within 454 series ordering instructions.
1.96
(.077")
Recommended
pad layout
Packaging
packaging
Option
12mm Tape
and Reel
12mm Tape
and Reel
packaging
Specification
EIA RS-481-1
(IEC 286, part 3)
EIA RS-481-1
(IEC 286, part 3)
Quantity
5000
1000
Quantity &
packaging
Code
NR
MR
Additional Information
Datasheet
452 Series
Resources
452 Series
Samples
452 Series
Datasheet
454 Series
Resources
454 Series
Samples
454 Series
© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 05/21/14
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