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
de-rating
Agency Approvals
AGENCY
AGENCY FILE NUMBER
E10480
LR29862
PS
E
AMPERE RANGE
375mA - 7A
temperature range
Applications
375mA - 7A
1A - 5A
NBK030205-E10480B
Electrical Characteristics for Series
% of Ampere
Rating
100%
200%
Opening Time
4 hours, Minimum
1 sec., Min.; 60 sec., Max.
equipment
protection
800%
0.02 sec., Min.; 0.1 sec., Max.
Electrical Specifications by Item
Ampere
Rating
(A)
Max
Voltage
Rating
(V)
Interrupting
Rating
Nominal Cold
Resistance
(Ohms)
1.2000
Nominal
Melting
I
2
t (A
2
sec)
0.101
0.240
0.904
001.
2.00
001.
002.
1.98
8.20
20.16
0.0224
4.00
004.
0.0186
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
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/452.html
or /454.html for current information.
61
Revised: December 3, 2009
452/454 Series
Agency Approvals
PS
E
Amp Code
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
452/454 Series
Surface Mount Fuses
Introduction to Circuit Protection
Transientology
NANO
2®
> Slo-Blo
®
> 452/454 Series
Temperature Rerating Curve
Average Time Current Curves
375mA
500mA
750mA
1.50A
1.00A
2.00A
2.50A
3.00A
3.50A
4.00A
5.00A
7.00A
100
10
TIME IN SECONDS
1
Note:
continuous operation.
0.1
0.01
0.1
1
10
100
1000
CURRENT IN AMPERES
Soldering Parameters
Reflow Condition
- Temperature Min (T
s(min)
)
- 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
60 – 120 secs
Pb – Free assembly
T
P
Ramp-up
t
P
Critical Zone
T
L
to T
P
Temperature
Pre Heat
- Temperature Max (T
s(max)
)
T
L
T
S(max)
Preheat
t
L
Ramp-down
T
S(min)
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
Temperature,
8 minutes max.
20 – 40 seconds
452/454 Series
62
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/452.html
or /454.html for current information.
Surface Mount Fuses
NANO
2®
> Slo-Blo
®
> 452/454 Series
Product Characteristics
Materials
Product Marking
Operating
Temperature
Moisture
Sensitivity Level
Solderability
Insulation
Resistance (after
Opening)
Mechanical Shock
Thermal Shock
Vibration
Moisture Resistance
Salt Spray
Resistance to Soldering
Heat
Dimensions
6.10
(.240")
F
Part Numbering System
0452 001. M R L
SERIES
AMP Code
The dot is positioned at the end of the
number sequence with whole ratings
and within for fractional ratings.
Example:
.375
T
1A
2.69
(.106")
2.69
(.106")
1.45
(.057")
QUANTITY Code
6.86
(.270")
3.15
(.124")
2.95
(.116")
PACKAGING Code
RoHS Compliant & Halogen Free
NOTE: “L suffix applies to 452 series only
”
1.96
(.077")
Recommended pad layout
Packaging
Packaging Option
Packaging Specification
Quantity
Quantity &
Packaging Code
1000
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/452.html
or /454.html for current information.
63
452/454 Series
452/454 Series
Introduction to Circuit Protection
Transientology
64
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
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