SURFACE-MOUNT FUSES
Slow-Blow Chip Fuses
Available in industry standard 1206 and 0603 chip sizes,
Littelfuse slow-blow chip fuses help provide overcurrent
protection on systems that experience large and frequent
current surges as part of their normal operation.
The slow-blow chip fuse’s monolithic, multilayer design
helps provide some of the highest current ratings
available in the 1206 and 0603 footprints and enhances
high-temperature performance in a wide range of
circuit protection designs. The devices’ small size, high
reliability and strong arc suppression characteristics
make them suitable for overcurrent protection of power
supplies, capacitor filter banks, Liquid Crystal Display
(LCD) backlight inverters, electric motors and portable
electronics.
BENEFITS
• Time-delayed design prevents nuisance openings in
pulsed and high inrush current applications
• Small size with high-current ratings
• Strong arc suppression characteristics
APPLICATIONS
• Small motors systems
• Portable electronics
• Input power ports
• Power over Ethernet (PoE)
• Test equipment
• POL converter protection
• Computer drives
• Displays
• Printers
FEATURES
• Lead-free materials and RoHS compliant
• Halogen free
(refers to: Br900ppm, Cl900ppm, Br+Cl1500ppm)
• Monolithic multilayer design
• High-temperature performance
• -55°C to +125°C operating temperature range
RoHS Compliant, ELV Compliant
HF
Halogen Free
Specifications subject to change without notice. ©2016 Littelfuse, Inc.
107
Surface Mount Fuses
Slow-Blow Chip Fuses
Shape and
Table FS1 — Clear Time Characteristics
0603SFS Series
% of Rated Current
100%
200%
300%
Recommended
Pad Layout
800% (2.0A-5.0A)
in (mm)
0.038±0.008
Clear Time
(0.97±0.20)
at 25°C
Dimensions
in (mm)
0.063±0.008
(1.60±0.20)
0.126±0.008
(3.20±0.20)
1206SFS Series
% of Rated Current
—
120 s (max)
3 s (max)
0.05 s (max)
0.05 s (max)
100%
200%
300%
800% (1.0A-1.5A)
800% (2.0A-8.0A)
Clear Time at 25°C
4 hrs (min)
1 s (min)
0.1 s (min)
0.0016 s (min)
0.002 s (min)
—
120 s (max)
3 s (max)
0.05 s (max)
0.05 s (max)
4 hrs (min)
0.020±0.010
(0.51±0.25)
s
0.1
0.173
(4.40)
1 s (min)
(min)
800% (1.0A-1.5A)
0.0005 s (min)
0.001 s (min)
0.059
(1.50)
0.071
(1.80)
Table FS2 — Typical Electrical Characteristics, Dimensions and Recommended
Pad Layout
0.057
(1.45)
0603 (1608 mm) Slow-Blow Chip Fuses
Shape and
Dimensions
in (mm)
0.031±0.006
(0.80±0.15)
0.063±0.006
(1.60±0.15)
Typical
Electrical Characteristics
Rated
Current
(A)
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Nominal Nominal
Cold DCR
I
2
t
(Ω)*
(A
2
sec)
†
0.200
0.100
0.052
0.041
0.031
0.021
0.017
0.015
0.013
0.093
0.18
0.32
0.63
0.87
1.20
2.30
2.70
3.20
Max
Interrupt Ratings
Voltage
(V
DC
)
32
32
32
32
32
32
32
32
32
Current
(A)
50
50
50
50
50
50
50
50
50
Part Number
0.031±0.006
(0.80±0.15)
0603SFS100F/32
0603SFS150F/32
0603SFS200F/32
0603SFS250F/32
0603SFS300F/32
0603SFS350F/32
0603SFS400F/32
0603SFS450F/32
0603SFS500F/32
0.014±0.006
(0.36±0.15)
Recommended
Pad Layout
in (mm)
0.110
(2.80)
0.024
(0.60)
0.039
(1.00)
0.043
(1.09)
1206 (3216 mm) Slow-Blow Chip Fuses
Shape and
Dimensions
in (mm)
0.063±0.008
(1.60±0.20)
Typical
Electrical Characteristics
Rated
Current
(A)
1.0
1.25
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
7.0
8.0
Nominal Nominal
Cold DCR
I
2
t
(Ω)*
(A
2
sec)
†
0.360
0.200
0.150
0.088
0.065
0.034
0.028
0.024
0.020
0.016
0.014
0.011
0.010
0.009
0.11
0.22
0.23
0.63
0.90
1.20
1.60
2.20
3.60
5.30
6.40
8.50
10.00
16.90
Max
Interrupt Ratings
Voltage
(V
DC
)
63
63
63
63
32
32
32
32
32
32
24
24
24
24
Current
(A)
50
50
50
50
50
50
50
50
50
50
50
60
60
60
0.126±0.008
(3.20±0.20)
Part Number
1206SFS100F/63
1206SFS125F/63
0.038±0.008
(0.97±0.20)
1206SFS150F/63
1206SFS200F/63
1206SFS250F/32
0.020±0.010
(0.51±0.25)
1206SFS300F/32
1206SFS350F/32
1206SFS400F/32
1206SFS450F/32
0.071
(1.80)
Recommended
Pad Layout
in (mm)
0.173
(4.40)
0.059
(1.50)
1206SFS500F/32
1206SFS550F/24
1206SFS600F/24
1206SFS700F/24
1206SFS800F/24
0.057
(1.45)
* Measured at
≤10%
of rated current and 25°C ambient temperature.
† Melting I
2
t at 0.001 sec clear time.
Shape and
Dimensions
in (mm)
0.031±0.006
(0.80±0.15)
0.063±0.006
(1.60±0.15)
0.031±0.006
(0.80±0.15)
108
Specifications subject to change without notice. ©2016 Littelfuse, Inc.
0.014±0.006
(0.36±0.15)
HF
Halogen Free
RoHS Compliant, ELV Compliant
Surface Mount Fuses
Slow-Blow Chip Fuses
Figures FS1-FS4 — Family Performance Curves
Figure FS1
0603SFS Average Time Current Curves
1.0
A
1.5
A
100
10
Clear Time (s)
1
0.1
0.01
0.001
1
10
100
2. 0
Figure FS2
0603SFS I²t vs. t Curves
0603SFS Family I
2
T vs. Clear Time
5.0A
4.5A
5.0A
4.0A
4.5A
3.5A
4.0A
3.0A
3.5A
2.5A
3.0A
2.0A
2.5A
2.0A
1.5A
1.5A
1.0A
1.0A
100
100
10,000
10,000
1000
1000
I
2
t (AtSec)
I
22
(A
2
s)
10
10
1
1
0.1
0.1
0.01
0.010.001
0.00001
0.0001
0.01
2. 5
3.0A
A
3.5
A
4.0
A
4.5
A
5.0
A
A
Current (A)
0.001
0.1
0.01
Time (s)
Time (Sec)
0.1
1
1
10
10
100
100
Note:
Curves are nominal.
RoHS Compliant, ELV Compliant
HF
Halogen Free
Specifications subject to change without notice. ©2016 Littelfuse, Inc.
109
Surface Mount Fuses
Slow-Blow Chip Fuses
Figures FS1-FS4 — Family Performance Curves
Figure FS3
1206SFS Average Time Current Curves
1. 2
5A
1.5
A
A
3.0
3 . 5A
4.0A
4.5A
5.0 A
5 . 5A
6 .0 A
7.0 A
A
8 .0
A
1.0
A
A
2. 0
2. 5
(Cont’d)
100
10
Clear Time (s)
1
0.1
0.01
0.001
1
10
100
1000
Current (A)
Figure FS4
1206SFS I²t vs. t Curves
100000
8.0A
7.0A
6.0A
5.5A
5.0A
4.5A
4.0A
3.5A
3.0A
2.5A
2.0A
1.5A
1.25A
1.0A
10000
1000
100
I
2
t (A
2
s)
10
1
0.1
0.01
0.001
0.01
0.1
1
10
100
Time (s)
Note:
Curves are nominal.
110
Specifications subject to change without notice. ©2016 Littelfuse, Inc.
HF
Halogen Free
RoHS Compliant, ELV Compliant
Surface Mount Fuses
Slow-Blow Chip Fuses
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.
RoHS Compliant, ELV Compliant
HF
Halogen Free
Specifications subject to change without notice. ©2016 Littelfuse, Inc.
111
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