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SURFACE-MOUNT FUSES  
Fast-Acting Chip Fuses  
Fast-acting chip fuses help provide overcurrent  
protection for systems using DC power sources up to  
63VDC. The fuse’s monolithic, multilayer design helps  
provide the highest hold current in the smallest footprint,  
reduce diffusion-related aging, improve product  
reliability and resilience, and enhance high-temperature  
performance in a wide range of circuit designs.  
These RoHS-compliant surface-mount devices offer  
strong arc suppression characteristics and help facilitate  
the development of more reliable, high-performance  
consumer electronics such as laptops, multimedia devices,  
cell phones and other portable electronics.  
BENEFITS  
APPLICATIONS  
• Small size with high current ratings  
• Temperature stability  
• Laptops  
• Digital cameras  
• Cell phones  
• Printers  
• High reliability and resilience  
• Strong arc suppression characteristics  
• DVD players  
• Portable electronics  
• Game systems  
• LCD monitors  
• Scanners  
FEATURES  
• Lead-free 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  
89  
Specifications subject to change without notice. ©2016 Littelfuse, Inc.  
RoHS Compliant, ELV Compliant  
Halogen Free  
HF  
Surface Mount Fuses  
Fast-Acting Chip Fuses  
Table FF1 — ClearTime Characteristics  
% of Rated Current  
ClearTime at 25°C  
4 hrs (min)  
100%  
250%  
400%  
5 s (max)  
0.05 s (max)  
Table FF2 —Typical Electrical Characteristics, Dimensions and Recommended  
Pad Layout  
0402 (1005mm) Fast-Acting Chip Fuses  
Typical Electrical Characteristics Max Interrupt Ratings  
Shape and  
Dimensions  
in (mm)  
0.020 0.004  
(0.51 0.10)  
0.039 0.004  
(1.00 0.10)  
Rated  
Current Cold DCR  
(A)  
Nominal Nominal  
I2t  
Voltage Current  
Part Number  
(Ω)*  
0.120  
0.056  
0.035  
0.021  
0.014  
(A2sec)†  
(VDC  
)
(A)  
35  
35  
35  
35  
35  
0.020 0.004  
(0.51 0.10)  
0402SFF100F/24  
0402SFF150F/24  
0402SFF200F/24  
0402SFF300F/24  
0402SFF400F/24  
1.00  
1.50  
2.00  
3.00  
4.00  
0.0170  
0.0490  
0.0700  
0.1250  
0.2250  
24  
24  
0.010 0.004  
(0.25 0.10)  
24  
24  
0.063  
(1.60)  
Recommended  
Pad Layout  
in (mm)  
24  
0.016  
(0.40)  
0.028  
(0.70)  
0.024  
(0.60)  
0603 (1608mm) Fast-Acting Chip Fuses  
Typical Electrical Characteristics Max Interrupt Ratings  
Shape and  
Dimensions  
in (mm)  
0.031 0.006  
(0.80 0.15)  
Rated  
Current Cold DCR  
(A)  
Nominal Nominal  
0.063 0.006  
(1.60 0.15)  
I2t  
Voltage Current  
Part Number  
(Ω)*  
(A2sec)†  
(VDC  
63  
63  
63  
63  
32  
32  
32  
32  
32  
32  
24  
)
(A)  
35  
35  
35  
35  
35  
35  
35  
35  
35  
35  
35  
0603SFF050F/32  
0603SFF075F/32  
0603SFF100F/32  
0603SFF150F/32  
0603SFF200F/32  
0603SFF250F/32  
0603SFF300F/32  
0603SFF350F/32  
0603SFF400F/32  
0603SFF500F/32  
0603SFF600F/24  
0.50  
0.75  
1.00  
1.50  
2.00  
2.50  
3.00  
3.50  
4.00  
5.00  
6.00  
0.485  
0.254  
0.147  
0.059  
0.044  
0.032  
0.025  
0.024  
0.018  
0.013  
0.010  
0.0029  
0.0064  
0.0160  
0.0300  
0.0600  
0.1150  
0.1900  
0.2950  
0.4000  
0.7000  
1.1250  
0.031 0.006  
(0.80 0.15)  
0.014 0.006  
(0.36 0.15)  
0.110  
(2.80)  
Recommended  
Pad Layout  
in (mm)  
0.024  
(0.60)  
0.039  
(1.00)  
0.043  
(1.09)  
1206 (3216mm) Fast-Acting Chip Fuses  
Typical Electrical Characteristics Max Interrupt Ratings  
Rated  
Current Cold DCR  
(A)  
Nominal Nominal  
Shape and  
Dimensions  
in (mm)  
0.063 0.008  
(1.60 0.20)  
I2t  
Voltage Current  
0.126 0.008  
(3.20 0.20)  
Part Number  
(Ω)*  
(A2sec)†  
(VDC  
63  
63  
63  
63  
63  
63  
32  
32  
32  
32  
32  
32  
32  
24  
24  
24  
)
(A)  
50  
50  
50  
50  
50  
50  
50  
50  
45  
45  
50  
50  
50  
45  
45  
45  
1206SFF050F/63  
1206SFF075F/63  
1206SFF100F/63  
1206SFF150F/63  
1206SFF175F/63  
1206SFF200F/63  
1206SFF250F/32  
1206SFF300F/32  
1206SFF400F/32  
1206SFF500F/32  
1206SFF600F/32  
1206SFF700F/32  
1206SFF800F/32  
1206SFF600F/24  
1206SFF700F/24  
1206SFF800F/24  
0.50  
0.75  
1.00  
1.50  
1.75  
2.00  
2.50  
3.00  
4.00  
5.00  
6.00  
7.00  
8.00  
6.00  
7.00  
8.00  
0.730  
0.513  
0.220  
0.120  
0.100  
0.050  
0.035  
0.031  
0.022  
0.015  
0.013  
0.011  
0.008  
0.013  
0.011  
0.008  
0.0021  
0.0052  
0.0120  
0.0250  
0.0450  
0.0700  
0.1400  
0.2200  
0.3800  
0.6000  
1.0000  
1.7500  
2.5000  
1.0000  
1.7500  
2.5000  
0.043 0.008  
(1.10 0.20)  
0.020 0.010  
(0.51 0.25)  
Recommended  
Pad Layout  
in (mm)  
0.173  
(4.40)  
0.059  
(1.50)  
0.071  
(1.80)  
0.057  
(1.45)  
* Measured at ≤10% of rated current and 25°C ambient temperature.  
† Melting I2t at 0.001 sec clear time.  
90  
Specifications subject to change without notice. ©2016 Littelfuse, Inc.  
Halogen Free  
RoHS Compliant, ELV Compliant  
HF  
Surface Mount Fuses  
Fast-Acting Chip Fuses  
Figures FF1-FF6 — Family Performance Curves  
Figure FF1  
Figure FF2  
0402SFF AverageTime Current Curves  
0402SFF I²t vs. t Curves  
1,000  
100  
4.0A  
3.0A  
2.0A  
1.5A  
10  
1
1.0A  
10  
0.1  
1
0.1  
0.01  
0.001  
0.0001  
0.01  
0.001  
0.0001  
0.1  
1
10  
100  
0.0001  
0.001  
0.01  
0.1  
1
10  
Current (A)  
Time (s)  
Note: Curves are nominal.  
Figure FF3  
Figure FF4  
0603SFF AverageTime Current Curves  
0603SFF I²t vs. t Curves  
10000  
1000  
100  
10  
10  
6.0A  
5.0A  
4.0A  
3.5A  
3.0A  
2.5A  
1
2.0A  
1.5A  
1.0A  
0.75A  
0.5A  
0.1  
1
0.1  
0.01  
0.01  
0.001  
0.1  
0.001  
0.001  
0.01  
0.1  
1
10  
1
10  
100  
Current (A)  
Time (s)  
Note: Curves are nominal.  
91  
Specifications subject to change without notice. ©2016 Littelfuse, Inc.  
RoHS Compliant, ELV Compliant  
Halogen Free  
HF  
Surface Mount Fuses  
Fast-Acting Chip Fuses  
(Cont’d)  
Figures FF1-FF6 — Family Performance Curves  
Figure FF5  
Figure FF6  
1206SFF AverageTime Current Curves  
1206SFF I²t vs. t Curves  
10000  
1000  
100  
10  
10  
8.0A  
7.0A  
6.0A  
5.0A  
4.0A  
3.0A  
2.5A  
2.0A  
1.75A  
1.5A  
1
1.0A  
0.75A  
0.5A  
0.1  
1
0.1  
0.01  
0.01  
0.001  
0.001  
0.1  
0.001  
0.01  
0.1  
1
10  
1
10  
100  
Time (s)  
Current (A)  
Note: Curves are nominal.  
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.  
92  
Specifications subject to change without notice. ©2016 Littelfuse, Inc.  
Halogen Free  
RoHS Compliant, ELV Compliant  
HF