Surface Mount Fuses
NANO
2®
> 157T Fuse and Holder Combination
157T Series – Standard Nano Fuse and Clip Assembly
Description
PS
E
The 157T Series Fuse/Clip assembly is a small, square,
Time-Lag, surface mount fuse that is assembled in surface
mountable fuse clips. 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.
The fuse clip and pre-installed fuse combination can
be automatically placed in PC Board in one efficient
manufacturing operation. It permits quick and easy
replacement of fuses without performing desoldering
process, even in the field and without exposing the PC
Board to detrimental effects of rework solder heat.
Agency Approvals
AgeNCy
AgeNCy FIle NumbeR
e14721
PS
E
Features
AmpeRe RANge
0.375A ~ 5A
1A
1.5A-5A
• Surface Mountable,
Time-Lag Fuse.
• Fully compatible with
RoHS/Pb-Free solder
alloys and higher
temperature profiles
associated with leadfree
assembly.
Applications
• Instrumentations
• Base Stations
Additional Information
• Easily replaceable on PC
Board (Field Replaceable)
• RoHS Compliant and
Halogen-free
• Available in ratings of
0.375 ~ 5 Amperes.
NbK030205-e10480A
NbK030205-e10480b
Electrical Characteristics for Series
% of Ampere
Rating
100%
200%
300%
800%
% of Ampere
Rating
0.375A ~ 5A
0.375A ~ 5A
0.375A ~ 5A
0.375A ~ 5A
Opening Time at 25ºC
4 hours, Minimum
1 sec. Minimum,
60 secs. Maximum
0.20 secs. Minimum,
3.00 secs. Maximum
0.02 secs. Minimum,
0.10 secs. Maximum
• Telecommunications
Datasheet
Resources
Samples
Electrical Specifications by Item
Ampere
Rating (A)
0.375
0.500
0.750
1.00
1.50
2.00
2.50
3.00
3.50
4.00
5.00
Amp
Code
.375
.500
.750
001
01.5
002
02.5
003
03.5
004
005
max Voltage
Rating (V)
125
125
125
125
125
125
125
125
125
125
125
Interrupting
Rating
(A)
Fuse
Furnished
0454.375
0454.500
0454.750
0454001.
045401.5
0454002.
045402.5
0454003.
045403.5
0454004.
0454005.
Nominal Cold
Resistance
(Ohms)
1.2214
0.7047
0.3602
0.2245
0.0934
0.0629
0.0452
0.0342
0.0226
0.0188
0.0138
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
Agency Approvals
PS
E
50A @ 125VAC/VDC
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
1. Cold resistance measured at less than 10% of rated current at 23ºC.
2. I
2
t values stated for 8ms opening time.
3. Agency Approval Table Key: X=Approved or Certified, P=Pending and Blank=Not Approved
4. Have special electrical characteristic needs? Contact Littelfuse to learn more about application specific options
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/19/13
Surface Mount Fuses
NANO
2®
> 157T Fuse and Holder Combination
Temperature Rerating Curve
Average Time Current Curves
.375A
.50A
100
10
TIME IN SECONDS
1
0.1
Note:
1. Derating depicted in this curve is in addition to the standard derating of 25% for
continuous operation.
0.01
0.001
0.1
1
10
100
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
200°C
2.0A
2.5A
3.0A
3.5A
4A
5A
.75A
1.0A
1.5A
T
P
T
L
Temperature
t
P
Ramp-up
Critical Zone
T
L
to T
P
60 – 120 secs
5°C/second max
5°C/second max
217°C
60 – 90 seconds
250
+0/-5
°C
20 – 40 seconds
5°C/second max
8 minutes Max.
260°C
T
S(max)
T
S(min)
Preheat
t
L
Ramp-down
t
S
25
time to peak temperature
(t 25ºC to peak)
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
Time
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/19/13
Surface Mount Fuses
NANO
2®
> 157T Fuse and Holder Combination
Product Characteristics
Body:
Ceramic
Cap:
For 0.375A ~ 5A – Silver plated Brass
Clip Plating:
Matte Tin
Body:
Brand Logo, Current Rating, “T” for
Time-Lag
Force applied at fuse center, perpendicular to
the long axis (@0.75 lbs. MIN)
MIL-STD-202, Method 208 / IPC/ EIA /
JEDEC J-STD002B, Test Condition A
MIL –STD-202, Method 103 @ 85ºC / 85%RH,
1000 hours
MIL-STD-202, Method 215 (3 solvent types)
Operating
Temperature
Thermal Shock
Vibration
Moisture Resistance
Salt Spray/
Atmosphere
Shock
-55ºC to 125ºC with proper derating
MIL
-STD-202, Method 107
,
Test Condition B
(5 cycles -65ºC to +125ºC)
MIL
-STD-202, Method 201
(10-55 Hz)
MIL
-STD-202, Method 106,
10 cycles
MIL
-STD-202, Method 101,
Test Condition B (48 hrs.), 5% NaCl in
De-ionized Water
MIL
-STD-202, Method 213,
Test Condition I (100 G’s peak for 6
milliseconds)
Materials
Product
Marking
Clip Retention
Solderability
Humidity Test
Resistance to
Solvents
Dimensions
6.50 ± 0.20
[0.256]
6.10
[0.240]
2.69
[0.106]
Part Numbering System
0157 005. D R T
SERIES
TIME-LAG FUSE
PACKING OPTION
R = Tape and Reel
2.69
[0.106]
F
L
1A
1.45
[0.057]
T
3.7 ± 0.13
[0.146]
AMP CODE
3.70
[0.146]
qUANTITY CODE
D = 1500 pcs
3.40
[0.134]
3.90 ± 0.13
[0.154]
Packaging
packaging
Option
packaging
Specification
Surface Mount
Quantity
1500
Quantity &
packaging Code
DRT
2.50 ± 0.2
[0.098]
"A"
0.10
"B"
7.26
[0.29]
Tape and Reel
3.00
[0.12]
2.46
[0.10]
2.40
[0.09]
PCB Recommendation for Thermal Management
1. Minimum Copper Layer Thickness = 100um
2. Minimum Copper Trace Width = 10mm
Note:
Alternate methods of thermal management may be used. In such cases, under normal
operations, the maximum temperature of the fuse body should not exceed 80ºC in a 25ºC
ambient environment.
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/19/13
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