Surface Mount Fuses
NANO
2®
> 157 Fuse and Holder Combination
157 Series – Standard Nano Fuse and Clip Assembly
Description
PS
E
The 157 Series – Standard Nano Fuse/Clip assembly is a
small, square, very fast acting surface mount fuse that is
assembled in surface mountable fuse clips. 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.
Features
Agency Approvals
AGENCY
AGENCY FILE NUMBER
E14721
PS
E
Very Fast Acting Fuse.
AMPERE RANGE
0.062A ~ 10A
1A
1.5A - 5A
6.3A - 10A
on PC Board (Field
Replaceable)
Halogen Free
0.062 ~ 10 Amperes.
NBK030205-E10480A
NBK030205-E10480B
NBK101105-E184655
RoHS/Pb-Free solder
alloys and higher
temperature profiles
associated with leadfree
assembly.
Applications
Electrical Characteristics for Series
% of Ampere Rating
100%
200%
Opening Time at 25ºC
Electrical Specifications by Item
Ampere
Rating (A)
0.062
0.080
0.100
0.125
0.160
0.200
0.250
0.315
0.375
0.400
0.500
0.630
0.750
0.800
1.0
1.25
1.5
1.6
2.0
2.5
3.0
3.15
3.5
4.0
5.0
6.3
7
.0
8.0
10.0
Amp
Code
.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.
010.
Max Voltage
Rating (V)
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
125
Interrupting
Rating (A)
Fuse
Furnished
0451.062
0451.080
0451.100
0451.125
0453.160
0453.200
0453.250
0453.315
0453.375
0453.400
0453.500
0453.630
0453.750
0453.800
0453001.
04531.25
045301.5
045301.6
0453002.
045302.5
0453003.
04533.15
045303.5
0453004.
0453005.
045306.3
0453007
.
0453008.
0453010.
Nominal Cold
Resistance
(Ohms)
5.5372
4.0500
3.1000
1.7059
1.2157
1.3971
1.0496
0.3881
0.6083
0.5600
0.4181
0.3050
0.2458
0.2120
0.1537
0.078
0.0634
0.0580
0.0373
0.0288
0.0229
0.0215
0.0203
0.0163
0.0127
0.0098
0.0092
0.0079
0.0058
Nominal
Melting
2
I t (A
2
sec)
0.00019
0.00033
0.00138
0.00286
0.0048
0.00652
0.01126
0.0311
0.0425
0.0484
0.0795
0.143
0.185
0.271
0.459
0.664
0.853
1.060
0.530
1.029
1.650
1.920
2.469
3.152
5.566
9.17
10.32
20.23
26.46
Agency Approvals
PS
E
50A @ 125 VAC/VDC
300A @ 32 VDC
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
35A @ 125 VAC / 50A @125 VDC
300A @ 32VDC
1. Cold resistance measured at less than 10% of rated current at 23ºC.
2. I
2
t values stated for 8ms opening time.
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/157.html for current information.
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.
95
Revised: February 19, 2010
157 Series
157 Series
Surface Mount Fuses
Introduction to Circuit Protection
Transientology
NANO
2®
> 157 Fuse and Holder Combination
Temperature Rerating Curve
Average Time Current Curves
2.0 A
2.50 A
3.0 A
3.50 A
4.0 A
5.0 A
6.30 A
7.0 A 8.0 A
10.0 A
10
0.2 A
0.25 A
0.315A
0.375 A
0.5 A
0.125 A
0.062A
0.75 A
1.0 A
1
10.000
TIME IN SECONDS
1.000
Note:
1. Derating depicted in this curve is in addition to the standard derating of 25% for
continuous operation.
0.100
0.010
0.001
0.01
0.1
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
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
1.50 A
T
P
Ramp-up
t
P
Critical Zone
T
L
to T
P
Temperature
200°C
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
157 Series
96
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/157.html for current information.
Surface Mount Fuses
NANO
2®
> 157 Fuse and Holder Combination
Product Characteristics
Body:
Ceramic
Cap:
For 0.062A ~ 0.125A – Au plated Brass
For 0.200A ~ 10A – Silver plated Brass
Clip Plating:
Body:
Brand Logo, Current Rating
Vibration
Force applied at fuse center, perpendicular to
Moisture Resistance
Salt Spray/
Atmosphere
1000 hours
Shock
Test Condition I (100 G’s peak for 6
milliseconds)
Operating
Temperature
Thermal Shock
-55ºC to 125ºC with proper derating
Test Condition B
(5 cycles -65ºC to +125ºC)
(10-55 Hz)
10 cycles
Test Condition B (48 hrs.),
5% NaCl in De-ionized Water
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 001. D R
SERIES
3.7 ± 0.13
[0.146]
F
L
1A
2.69
[0.106]
PACKING OPTION
AMP CODE
R = Tape and Reel
1.45
[0.057]
QUANTITY CODE
3.70
[0.146]
D = 1500 pcs
3.90 ± 0.13
[0.154]
3.40
[0.134]
2.50 ± 0.2
[0.098]
"A"
0.10
"B"
7.26
[0.29]
3.00
[0.12]
2.46
[0.10]
2.40
[0.09]
PCB Recommendation for Thermal Management
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.
Packaging
Packaging Option
Tape and Reel
Packaging Specification
Quantity
1500
Quantity &
Packaging Code
DR
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/157.html for current information.
97
157 Series
157 Series
Introduction to Circuit Protection
Transientology
98
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
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