Slow-Blow Chip Fuses
Slow-Blow Chip Fuses
Available in industry standard 1206 and 0603 chip sizes,
Raychem slow-blow chip fuses help provide overcurrent
protection on systems that experience large and
frequent current surges as part of their normal
operation.
The Raychem 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, LCD (Liquid Crystal
Display) 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
Features
• RoHS compliant
• Halogen free
(refers to: Br 900ppm, Cl 900ppm, Br+Cl 1500ppm)
• Monolithic multilayer design
• High-temperature performance
• -55°C to +125°C operating temperature range
Applications
• Small motors systems
• Portable electronics
• Input power ports
• Power over Ethernet (POE)
• Test equipment
• POL Converter Protection
• Computer drives
• Displays
• Printers
13
111
0
Table FS1 Clear Time Characteristics for Slow-Blow Chip Fuses
0603SFS Series
% of rated current
100%
200%
300%
800%(1.0A-1.5A)
800%(2.0A-5.0A)
Clear time at 25°C
4 hours (min.)
1 second (min.)
0.1 second (min.)
120 seconds (max.)
3 seconds (max.)
1206SFS Series
% of rated current
100%
200%
300%
800%(1.0A-1.5A)
800%(2.0A-8.0A)
Clear time at 25°C
4 hours (min.)
1 second (min.)
0.1 second (min.)
120 seconds (max.)
3 seconds (max.)
0.0005 second (min.) 0.05 seconds (max.)
0
0.001 second (min.) 0.05 seconds (max.)
0.0016 second (min.) 0.05 seconds (max.)
0.002 second (min.) 0.05 seconds (max.)
Table FS2
Typical Electrical Characteristics, Dimensions and Recommended Pad Layout for
Slow-Blow Chip Fuses
0603 (1608mm) Slow-Blow Chip Fuses
Typical Electrical
Characteristics
Rated
Nominal
Nominal
Current
Cold DCR
I
2
t
2
(A)
(Ω)*
(A sec)†
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
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
Shape and
Dimensions
Inch (mm)
0.031±0.006
(0.80±0.15)
0.063±0.006
(1.60±0.15)
Part Number
0.031±0.006
(0.80±0.15)
0603SFS100F/32
0603SFS150F/32
0.014±0.006
(0.36±0.15)
0603SFS200F/32
0603SFS250F/32
Recommended
Pad Layout
Inch (mm)
0.110
(2.80)
0.024
(0.60)
0.039
(1.00)
0.043
(1.09)
0603SFS300F/32
0603SFS350F/32
0603SFS400F/32
0603SFS450F/32
0603SFS500F/32
1206 (3216mm) Slow-Blow Chip Fuses
Typical Electrical
Characteristics
Rated
Nominal
Nominal
Current
Cold DCR
I
2
t
(A)
(Ω)*
(A
2
sec)†
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
0.360
0.200
0.150
0.082
0.070
0.032
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
Shape and
Dimensions
Inch (mm)
0.063±0.008
(1.60±0.20)
0.126±0.008
(3.20±0.20)
Part Number
1206SFS100F/63
13
0.020±0.010
(0.51±0.25)
1206SFS125F/63
0.038±0.008
(0.97±0.20)
1206SFS150F/63
1206SFS200F/63
1206SFS250F/32
1206SFS300F/32
1206SFS350F/32
Recommended
Pad Layout
Inch (mm)
0.173
(4.40)
0.059
(1.50)
0.071
(1.80)
0.057
(1.45)
1206SFS400F/32
1206SFS450F/32
1206SFS500F/32
1206SFS550F/24
1206SFS600F/24
1206SFS700F/24
1206SFS800F/24
* Measured at 10% of rated current and 25°C ambient temperature.
† Melting I
2
t at 0.001 sec clear time.
112
RoHS Compliant, ELV Compliant
HF
Halogen Free
Slow-Blow Chip Fuses
Figure FS1-FS4 Family Performance Curves
Figure FS1
0603SFS Average Time Current Curves
100
A
B
10
C
E
D
F
G
A =
1.0A
1.5A
2.0A
2.5A
3.0A
3.5A
4.0A
4.5A
5.0A
H I
B =
C =
D =
E =
F =
G =
H =
I
=
Clear Time (s)
1
0.1
0.01
0.001
1
10
100
Current (A)
Figure FS2
0
0603SFS I²t vs. t Curves
10,000
A =
B =
C =
1000
D =
E =
G =
100
I
=
1.0A
1.5A
2.0A
2.5A
3.0A
4.0A
5.0A
I
HG
F
E
D
B
C
A
F = 3.5A
H = 4.5A
13
I
I
2
t (A
2
s)
10
1
0.1
0
0.01
0.001
0.01
0.1
1
10
100
Time (s)
Note:
Curves are nominal
RoHS Compliant, ELV Compliant
HF
Halogen Free
113
Figure FS1-FS4 Family Performance Curves
Figure FS3
1206SFS Average Time Current Curves
100
... Cont’d
A
B C
D
E
F GH I J K L M N
A =
B =
C =
D =
1.0A
1.2A
1.5A
2.0A
2.5A
3.0A
4.0A
5.0A
6.0A
7.0A
10
E =
F =
H =
G = 3.5A
I
= 4.5A
Clear Time (s)
1
J =
L =
M=
0.1
K = 5.5A
N = 8.0A
0.01
0.001
1
10
100
1000
Current (A)
Figure FS4
1206SFS I²t vs. t Curves
100000
A =
C =
D =
E =
F =
1000
1.0A
1.5A
2.0A
2.5A
3.0A
H =
I
J =
L =
M=
4.0A
5.0A
6.0A
7.0A
B = 1.25A
10000
= 4.5A
K = 5.5A
G = 3.5A
N = 8.0A
13
I
2
t (A
2
s)
G
F
E
D
C
B
A
100
10
M
L
N
K
J
I
H
1
0.1
0.01
0.001
0.01
0.1
1
10
100
Time (s)
Note:
Curves are nominal
114
RoHS Compliant, ELV Compliant
HF
Halogen Free
Slow-Blow Chip Fuses
Table FS3 Environmental Specifications for Slow-Blow Chip Fuses
Operating temperature
Mechanical vibration
Mechanical shock
Thermal shock
Resistance to soldering heat
Solderability
Moisture resistance
Salt spray
-55°C to +125°C
Withstands 5-3000 Hz at 30 Gs when evaluated per Method 204 of MIL-STD-202
Withstands 1500 Gs, 0.5 millisecond half-sine pulses when evaluated per Method 213 of MIL-STD-202
Withstands 100 cycles from -65°C to +125°C when evaluated per Method 107 of MIL-STD-202
Withstands 60 seconds at +260°C when evaluated per Method 210 of MIL-STD-202
Meets 95% minimum coverage requirement when evaluated per Method 208 of MIL-STD-202
Withstands 10 cycles when evaluated per Method 106 of MIL-STD-202
Withstands 48-hour exposure when evaluated per Method 101 of MIL-STD-202
Table FS4 Material Specifications for Slow-Blow Chip Fuses
Construction body material
Termination material
Fuse element
Ceramic
Silver, Nickel, Tin
Silver
Figure FS5 Thermal Derating Current for Slow-Blow Chip Fuses
Temperature Effect on Current Rating
105
100
95
90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
-55
% De-rating
-35
-15
5
25
45
65
85
105
125
145
Maximum Operating Temperature (˚C)
13
Table FS5 Electrical Specifications for Slow-Blow Chip Fuses
Insulation resistance after opening
20,000Ω minimum @ rated voltage. Fuse clearing under low voltage conditions may result in lower
post-clearing insulation values. Under normal fault conditions Raychem fuses provide sufficient
insulation resistance for circuit protection.
Withstands 100% rated current at +25°C ambient for 4 hours when evaluated per MIL-PRF-23419.
Current carrying capacity
Table FS6 Packaging Information for Slow-Blow Chip Fuses
Reel Quantity
(pcs)
4,000
3,000
Carrier
Tape Size
8.00 ± 0.10mm
8.00 ± 0.10mm
Reels per Outside
Shipment Box
5
5
Outside Shipment
Boxes per Overpack
5
5
Size
0603 (1608)
1206 (3216)
Reel Diameter
178mm white plastic
178mm white plastic
Reel Width
9.0 ± 0.5mm
9.0 ± 0.5mm
Tape Type
Plastic
Plastic
RoHS Compliant, ELV Compliant
HF
Halogen Free
115
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