F1206B0R25FW/STR [KYOCERA AVX]

Electric Fuse;
F1206B0R25FW/STR
型号: F1206B0R25FW/STR
厂家: KYOCERA AVX    KYOCERA AVX
描述:

Electric Fuse

电路保护
文件: 总38页 (文件大小:700K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
A KYOCERA GROUP COMPANY  
AVX  
Accu-Guard Series  
SMD Thin-Film Fuse  
Accu-Guard®  
Table of Contents  
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2  
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2  
How To Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2  
Accu-Guard® II,  
Type F0402G Low Current Miniature 0402 Size Thin-Film Fuses . . . . . . . . . .3  
Accu-Guard® II,  
Types F0402E, F0603E, F0603C, F0805B, F1206B and F0612D . . . . . . . . . . . .7  
Accu-Guard®, Type 1206A* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24  
Quality and Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28  
Handling and Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28  
Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30  
How To Choose The Correct Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31  
*Not recommended for new designs, please consult factory.  
NOTICE: Specifications are subject to change without notice. Contact your nearest AVX Sales Office for the latest specifications. All statements, information and data given  
herein are believed to be accurate and reliable, but are presented without guarantee, warranty, or responsibility of any kind, expressed or implied. Statements  
or suggestions concerning possible use of our products are made without representation or warranty that any such use is free of patent infringement and are not  
recommendations to infringe any patent. The user should not assume that all safety measures are indicated or that other measures may not be required. Specifications are  
typical and may not apply to all applications.  
© AVX Corporation  
Accu-Guard®  
SMD Thin-Film Fuse  
ACCU-GUARD® TECHNOLOGY  
APPLICATIONS  
The Accu-Guard® series of fuses is based on thin-film tech-  
niques. This technology provides a level of control on the com-  
ponent electrical and physical characteristics that is generally  
not possible with standard fuse technologies. This has allowed  
AVX to offer a series of devices which are designed for mod-  
ern surface mount circuit boards which require protection.  
• Cellular Telephones  
• Two-Way Radios  
• Computers  
Not RoHS Compliant  
• Battery Chargers  
• Rechargeable Battery Packs  
• Hard Disk Drives  
• PDA’s  
FEATURES  
• Accurate current rating  
• LCD Screens  
For RoHS compliant products,  
please select correct termination style.  
• Fast acting  
• SCSI Interface  
• Digital Cameras  
• Video Cameras  
• Small-standard 0402, 0603, 0805, 1206 and 0612  
chip sizes  
• Taped and reeled  
• Completely compatible with all soldering systems  
used for SMT  
APPROVAL FILE NUMBERS  
• UL, cUL:  
RCD#E143842  
• Lead Free Series (F0402E, F02402G, F0603E, F0805B,  
F1206B)  
DIMENSIONS millimeters (inches)  
F0603C, F0805B, F1206A and F1206B  
F0402E and F0603E  
F0402G  
B1  
B
S
A
B
H
T
T
T
W
B
L
L
L
W
F0402G  
F0402E  
F0603E  
F0603C  
F0805B  
F1206A/B  
F0612D  
1.65 0.25  
1.00 0.05  
1.00 0.10  
1.60 0.10  
1.65 0.25  
2.1 0.2  
3.1 0.2  
L
W
T
(0.039 0.002) (0.039 0.004) (0.063 0.004) (0.065 0.010) (0.083 0.008) (0.122 0.008) (0.065 0.010)  
0.58 0.04  
(0.023 0.002) (0.022 0.003) (0.032 0.004) (0.031 0.006) (0.050 0.004) (0.063 0.004) (0.122 0.008)  
0.35 0.05 0.40 0.10 0.63 0.10 0.ꢀ0 0.15 0.90 0.2 1.2 0.2 0.90 0.2  
(0.014 0.002) (0.016 0.004) (0.025 0.004) (0.028 0.006) (0.035 0.008) (0.04ꢀ 0.008) (0.036 0.008)  
0.55 0.0ꢀ  
0.81 0.10  
0.80 0.15  
1.2ꢀ 0.1  
1.6 0.1  
3.1 0.2  
0.48 0.05  
0.20 0.10  
0.35 0.15  
0.35 0.15  
0.30 0.15  
0.43 0.25  
0.35 0.15  
B
(0.019 0.002) (0.008 0.004) (0.014 0.006) (0.014 0.006) (0.012 0.006) (0.01ꢀ 0.010) (0.014 0.006)  
0.20 0.05  
(0.008 0.002)  
0.05 0.05  
A
S, H  
(0.002 0.002)  
HOW TO ORDER  
F
1206  
A
0R20  
F
W
TR  
Product  
Size  
See table for  
standard sizes  
Fuse Version  
Rated Current  
Current expressed in  
Amps. Letter R denotes  
decimal point. e.g.  
0.20A=0R20  
Fuse  
Speed  
F=Fast  
Termination  
S=Nickel/Lead-Free  
Solder coated  
(Sn 100)  
W=Nickel/solder coated  
(Sn 63, Pb 3ꢀ)  
Packaging  
TR=Tape and reel  
Fuse  
A=Accu-Guard®  
B=Accu-Guard® II  
C=Accu-Guard® II 0603  
D=Accu-Guard® II 0612  
E=Accu-Guard® II 0402, 0603  
G=Accu-Guard® II 0402  
Low Current  
1.ꢀ5A=1Rꢀ5  
N=Nickel/Lead-Free  
Solder Coated (Sn100)  
2
Accu-Guard® II Low Current  
Miniature 0402 Size Thin-Film Fuses  
The new F0402G Accu-Guard® series of fuses is based on  
thin-film technology which allows precise control of the  
component electrical and physical characteristics that is not  
possible with standard fuse technologies. The Accu-Guard  
Low Current series encompasses the lowest current ratings  
in a compact 0402 package and features LGA terminations.  
ELECTRICAL SPECIFICATIONS  
Operating temperature: -55ºC to +125ºC  
RECOMMEND PAD LAYOUT  
millimeters (inches)  
Current carrying capacity:  
-55ºC to -11ºC 10ꢀ% of rating  
-10ºC to +60ºC 100% of rating  
+61ºC to +100°C 85% of rating  
+101ºC to +125°C 80% of rating  
0.55  
(0.022)  
Rated voltage: 32V  
Post-fusing resistance: >1MΩ  
0.31 (0.012)  
1.15 (0.045)  
Current  
Rating  
A
0.050  
0.062  
0.0ꢀ5  
0.100  
0.125  
0.150  
0.200  
Resistance  
@0.1 x IRATED  
Ω (max.)  
3.4  
Voltage Drop  
Fusing Current  
(within 5 sec)  
A
Pre-Arc I2t  
@10xIRATED  
A2-sec (typ)  
2 x 10-6  
Color  
Code  
Part Number  
@IRATED  
mV (max.)  
250  
F0402G0R05FNTR  
F0402G0R06FNTR  
F0402G0R0ꢀFNTR  
F0402G0R10FNTR  
F0402G0R12FNTR  
F0402G0R15FNTR  
F0402G0R20FNTR  
0.125  
0.155  
0.18ꢀ5  
0.250  
0.312  
0.3ꢀ5  
0.500  
Blue  
Yellow  
Brown  
Red  
White  
Green  
Pink  
2.5  
2.0  
2.4  
1.6  
1.2  
0.8  
280  
280  
300  
250  
220  
210  
2 x 10-6  
4 x 10-6  
ꢀ x 10-6  
1 x 10-5  
2 x 10-5  
4 x 10-5  
ENVIRONMENTAL CHARACTERISTICS  
Test  
Conditions  
Requirement  
Solderability  
Components completely immersed in a  
solder bath at 245 5°C for 3 secs.  
Components completely immersed in a solder  
bath at 255 5°C for 60 secs.  
12 months minimum with components  
stored in “as received” packaging.  
Components mounted to a substrate.  
Increasing shearing force applied paralled to  
the sufstrate till destruction.  
Total area of imperfections in solder coating  
up to 5% of the land suface area  
Dissolution of termination  
≤ 15% of the land surface area  
Good solderability  
Leach Resistance  
Storage  
Shear  
Destruction at 5N force minimum  
Temperature  
Cycling  
Bend  
Components mounted to a flexible substrate  
(e.g. FR – 4). 1000 cycles -55ºC to +125ºC.  
Tested as shown in diagram  
No Visible damage  
ΔR/R<10%  
No visible damage  
ΔR/R<10%  
3 mm  
Deflection  
45mm  
45mm  
Accu-Guard® II Low Current  
Miniature 0402 Size Thin-Film Fuses  
FUSE TIME – CURRENT CHARACTERISTICS  
10  
200 mA  
150 mA  
125 mA  
1
10-1  
10-2  
10-3  
10-4  
100 mA  
75 mA  
62 mA  
50 mA  
10-5  
10-6  
0.1  
1
10  
Current, Amp  
4
Accu-Guard® II Low Current  
Miniature 0402 Size Thin-Film Fuses  
FUSE PRE-ARC JOULE INTEGRALS VS CURRENT  
10  
1
200 mA  
150 mA  
125 mA  
10-1  
10-2  
10-3  
10-4  
10-5  
10-6  
100 mA  
75 mA  
62 mA  
50 mA  
0
0.5  
1
1.5  
2
2.5  
3
Current, Amp  
Accu-Guard® II Low Current  
Miniature 0402 Size Thin-Film Fuses  
FUSE PRE-ARC JOULE INTEGRALS VS PRE-ARC TIME  
10  
1
200 mA 150 mA 125 mA  
100 mA 75 mA  
10-1  
10-2  
10-3  
10-4  
10-5  
10-6  
50 mA  
62 mA  
10-6  
10-5  
10-4  
10-3  
10-2  
10-1  
1
10  
Pre-Arc Time, seconds  
6
Accu-Guard® II  
SMD Thin-Film Fuse  
Accu-Guard® II is a version of Accu-Guard® fuses for a  
wider range of current and voltage ratings. Constructed on  
alumina substrates, Accu-Guard® II fuses display superior  
electrical, mechanical and environmental properties.  
Accu-Guard® II dimensions are standard 0402, 0603,  
0805, 1206 and 0612 chip sizes, see page 2.  
For F1206B and F0805B at -55°C is 10ꢀ% of rating, at  
+25°C 100% of rating, at +85°C 93% of rating, at +125°C  
90% of rating. For F0805B 2.50A and 3.00A at +85°C 90%  
of rating, at +125°C 90% of rating.  
Interrupting rating: 50A.  
Insulation resistance: >20MΩ guaranteed (after fusing at  
rated voltage).  
ELECTRICAL SPECIFICATIONS  
Operating temperature: -55°C to +125°C  
For F0612D at -55°C 10ꢀ% of rating, at +25°C 100% of  
rating, at +85°C 80% of rating, at +125°C ꢀ5% of rating.  
Current carrying capacity:  
For F0402E and F0603E at -55°C 10ꢀ% of rating, at -25°C  
100% of rating, at +125°C 80% of rating. For F0603C at  
-55°C is 10ꢀ% of rating, at +25°C 100% of rating, at +85°C  
90% of rating, at +125°C ꢀ5% of rating.  
Current  
Resistance  
Voltage Drop  
Fusing Current  
Pre-Arc  
Rated  
Type  
Part Number  
Rating 10% x I rated, 25°C @1 x I rated, 25°C (within 5 sec), 25°C  
A
I2t @ 50A Voltage  
Ω (max.)  
0.650  
0.250  
0.200  
0.130  
0.060  
0.040  
0.650  
0.450  
0.250  
0.200  
0.130  
0.090  
0.060  
0.050  
0.040  
0.035  
0.030  
0.800  
0.500  
0.320  
0.300  
0.200  
0.1ꢀ0  
0.110  
0.090  
0.0ꢀ5  
0.055  
0.045  
0.ꢀ50  
0.350  
0.2ꢀ0  
0.220  
0.1ꢀ0  
0.120  
0.080  
0.060  
0.050  
0.ꢀ50  
0.350  
0.180  
0.120  
0.080  
0.050  
0.040  
0.025  
mV (max.)  
220  
180  
180  
160  
140  
120  
220  
220  
180  
180  
160  
140  
140  
120  
120  
100  
100  
280  
280  
280  
280  
240  
240  
240  
240  
240  
200  
200  
280  
280  
280  
280  
280  
240  
220  
220  
220  
280  
280  
240  
240  
220  
220  
260  
200  
A
A2-sec  
0.00005*  
0.0003  
0.003  
0.008  
0.03  
V
F0402E0R25FSTR  
F0402E0R50FSTR  
F0402E0Rꢀ5FSTR  
F0402E1R00FSTR  
F0402E1R50FSTR  
F0402E2R00FSTR  
F0603E0R25FSTR  
F0603E0R3ꢀFSTR  
F0603E0R50FSTR  
F0603E0Rꢀ5FSTR  
F0603E1R00FSTR  
F0603E1R25FSTR  
F0603E1R50FSTR  
F0603E1Rꢀ5FSTR  
F0603E2R00FSTR  
F0603E2R50FSTR  
F0603E3R00FSTR  
F0603C0R25FWTR  
F0603C0R3ꢀFWTR  
F0603C0R50FWTR  
F0603C0Rꢀ5FWTR  
F0603C1R00FWTR  
F0603C1R25FWTR  
F0603C1R50FWTR  
F0603C1Rꢀ5FWTR  
F0603C2R00FWTR  
F0603C2R50FWTR  
F0603C3R00FWTR  
F0805B0R25FW/STR  
F0805B0R50FW/STR  
F0805B0Rꢀ5FW/STR  
F0805B1R00FW/STR  
F0805B1R25FW/STR  
F0805B1R50FW/STR  
F0805B2R00FW/STR  
F0805B2R50FW/STR  
F0805B3R00FW/STR  
F1206B0R25FW/STR  
F1206B0R50FW/STR  
F1206B1R00FW/STR  
F1206B1R50FW/STR  
F1206B2R00FW/STR  
F1206B3R00FW/STR  
F0612D4R00FWTR  
F0612D5R00FWTR  
0.25  
0.50  
0.ꢀ5  
1.00  
1.50  
2.00  
0.25  
0.3ꢀ5  
0.50  
0.ꢀ5  
1.00  
1.25  
1.50  
1.ꢀ5  
2.00  
2.50  
3.00  
0.25  
0.3ꢀ5  
0.50  
0.ꢀ5  
1.00  
1.25  
1.50  
1.ꢀ5  
2.00  
2.50  
3.00  
0.25  
0.50  
0.ꢀ5  
1.00  
1.25  
1.50  
2.00  
2.50  
3.00  
0.25  
0.50  
1.00  
1.50  
2.00  
3.00  
4.00  
5.00  
0.625  
1.25  
1.8ꢀ5  
2.50  
3.ꢀ5  
5.00  
0.625  
0.940  
1.25  
1.8ꢀ5  
2.50  
3.125  
3.ꢀ5  
4.3ꢀ5  
5.00  
6.25  
ꢀ.50  
0.50  
0.ꢀ5  
1.00  
1.50  
2.00  
2.50  
3.00  
3.50  
4.00  
5.00  
6.00  
0.50  
1.00  
1.50  
2.00  
2.50  
3.00  
4.00  
5.00  
6.00  
0.50  
1.00  
2.00  
3.00  
4.00  
6.00  
10  
32  
32  
32  
32  
32  
32  
32  
32  
32  
32  
32  
32  
32  
32  
32  
32  
32  
32  
32  
32  
32  
32  
32  
32  
24  
24  
16  
16  
63  
63  
63  
63  
63  
63  
63  
63  
63  
63  
63  
63  
63  
63  
63  
32  
32  
F0402E  
0.06  
0.00005*  
0.0001  
0.0003  
0.003  
0.008  
0.01  
0.03  
0.04  
0.06  
0.12  
F0603E  
0.25  
0.00003*  
0.0001  
0.0002  
0.0015  
0.004  
0.00ꢀ  
0.012  
0.02  
F0603C  
0.03  
0.05  
0.1  
0.00003*  
0.0002  
0.001  
0.003  
0.00ꢀ  
0.010  
0.030  
0.050  
0.10  
0.00003  
0.0002  
0.003  
0.010  
0.030  
0.10  
F0805B  
F1206B  
F0612D  
0.10  
0.25  
12.5  
*Current is limited to less than 50A at 32V due to internal fuse resistance.  
Accu-Guard® II  
SMD Thin-Film Fuse  
ENVIRONMENTAL CHARACTERISTICS  
Test  
Solderability  
Conditions  
Requirement  
Terminations to be well tinned  
No visible damage  
Dissolution of termination  
≤ 25% of area  
Components completely immersed in a  
solder bath at 235 5°C for 2 secs.  
Completely immersed in a solder bath  
at 260 5°C for 60 secs.  
Leach Resistance  
ΔR/R<10%  
Storage  
Shear  
12 months minimum with components  
stored in “as received” packaging.  
Components mounted to a substrate.  
A force of 5N applied normal to the  
line joining the terminations and in  
a line parallel to the substrate.  
Components mounted to a substrate.  
50 cycles -55°C to +125°C.  
Per Mil-Std-202F  
Good solderability  
No visible damage  
Rapid Change of  
Temperature  
Vibration  
No visible damage  
Δ R/R<10%  
No visible damage  
ΔR/R<10%  
Method 201A and  
Method 204D Condition D.  
Bend  
Tested as shown in diagram  
No visible damage  
ΔR/R<10%  
3 mm  
Deflection  
45mm  
45mm  
Load Life  
F0805B, F1206B  
25°C, rated current, 20,000 hrs.  
No visible damage  
ΔR/R<10%  
8
Accu-Guard® II  
Lead-Free SMD Thin-Film Fuse  
FUSE TIME – CURRENT CHARACTERISTICS  
FOR TYPE F0402E (TYPICAL)  
10  
1
2.0A  
1.5A  
10-1  
1.0A  
Pre-  
Arc  
Time,  
0.75A  
10-2  
sec  
0.5A  
0.25A  
10-3  
10-4  
10-5  
10-6  
0.1  
1
10  
100  
Current, Amp  
Accu-Guard® II  
Lead-Free SMD Thin-Film Fuse  
FUSE PRE-ARC JOULE INTEGRALS VS CURRENT  
FOR TYPE F0402E (TYPICAL)  
100  
10  
1
10-1  
Pre-  
Arc  
2.0A  
1.5A  
I2t,  
10-2  
10-3  
10-4  
10-5  
10-6  
A2sec  
1.0A  
0.75A  
0.5A  
0.25A  
0
10  
20  
30  
40  
50  
60  
Current, Amp  
10  
Accu-Guard® II  
Lead-Free SMD Thin-Film Fuse  
FUSE PRE-ARC JOULE INTEGRALS VS PRE-ARC TIME  
FOR TYPE F0402E (TYPICAL)  
100  
100  
0
10  
1
0
10-1  
Pre-  
Arc I2t,  
2.0A  
1.5A  
0
10-2  
10-3  
A2sec  
0
1.0A  
0
10-4  
0.75A  
0.5A  
0
10-5  
10-6  
0.25A  
0
0
0
0
0
0
0
0
10-6  
10-5  
10-4  
10-3  
10-2  
10-1  
1
10  
Pre-Arc Time, sec  
Accu-Guard® II  
Lead-Free SMD Thin-Film Fuse  
FUSE TIME – CURRENT CHARACTERISTICS  
FOR TYPE F0603E (TYPICAL)  
10  
1
3.0A  
2.5A  
2.0A  
1.75A  
1.5A  
10-1  
1.25A  
1.0A  
10-2  
0.75A  
Pre-  
Arc  
Time,  
sec  
0.5A  
0.375A  
0.25A  
10-3  
10-4  
10-5  
10-6  
0.1  
1
10  
100  
Current, Amp  
12  
Accu-Guard® II  
Lead-Free SMD Thin-Film Fuse  
FUSE PRE-ARC JOULE INTEGRALS VS CURRENT  
FOR TYPE F0603E (TYPICAL)  
100  
10  
3.0A  
2.5A  
2.0A  
1.75A  
1
10-1  
10-2  
10-3  
10-4  
10-5  
10-6  
1.5A  
1.25A  
1.0A  
0.75A  
0.5A  
0.375A  
0.25A  
0
10  
20  
30  
40  
50  
60  
Current, Amp  
Accu-Guard® II  
Lead-Free SMD Thin-Film Fuse  
FUSE PRE-ARC JOULE INTEGRALS VS PRE-ARC TIME  
FOR TYPE F0603E (TYPICAL)  
100  
3.0A  
10  
1
2.5A  
2.0A  
1.75A  
1.5A  
10-1  
1.25A  
1.0A  
Pre-  
10-2  
10-3  
10-4  
10-5  
10-6  
Arc I2t,  
A2sec  
0.75A  
0.5A  
0.375A  
0.25A  
10-6  
10-5  
10-4  
10-3  
10-2  
10-1  
1
10  
Pre-Arc Time, sec  
14  
Accu-Guard® II  
SMD Thin-Film Fuse  
FUSE TIME - CURRENT CHARACTERISTICS  
FOR TYPE F0603C (TYPICAL)  
10  
1
0.15A  
0.25A  
0.375A  
0.50A  
0.75A  
1.00A  
1.25A  
1.5A  
1.75A  
2.0A  
2.5A  
3.0A  
10-1  
10-2  
10-3  
10-4  
10-5  
10-6  
0.1  
1
10  
100  
Current, Amp  
Accu-Guard® II  
SMD Thin-Film Fuse  
FUSE PRE-ARC JOULE INTEGRALS  
VS. CURRENT FOR TYPE F0603C (TYPICAL)  
100  
10  
1
10-1  
10-2  
3.00A  
2.50A  
2.00A  
1.75A  
1.50A  
1.25A  
1.00A  
0.75A  
0.50A  
0.375A  
0.25A  
0.15A  
10-3  
10-4  
10-5  
10-6  
0
10  
20  
30  
40  
50  
60  
Current, Amp  
16  
Accu-Guard® II  
SMD Thin-Film Fuse  
FUSE PRE-ARC JOULE INTEGRALS  
VS. PRE-ARC TIME FOR TYPE F0603C (TYPICAL)  
100  
10  
1
10-1  
10-2  
10-3  
10-4  
3.00A  
2.50A  
2.00A  
1.75A  
1.50A  
1.25A  
1.00A  
0.75A  
0.50A  
0.375A  
0.25A  
0.15A  
10-5  
10-6  
10-7  
10-6  
10-5  
10-4  
10-3  
10-2  
10-1  
1
10  
Pre-Arc Time, Seconds  
Accu-Guard® II  
SMD Thin-Film Fuse  
FUSE TIME - CURRENT CHARACTERISTICS  
FOR TYPES F0805B AND F1206B (TYPICAL)  
10  
1
0.15A  
0.25A  
0.50A  
0.75A  
1.00A  
1.25A  
1.5A  
2.0A  
2.5A  
3.0A  
10-1  
10-2  
10-3  
10-4  
10-5  
10-6  
0.1  
1
10  
100  
Current, Amp  
18  
Accu-Guard® II  
SMD Thin-Film Fuse  
FUSE PRE-ARC JOULE INTEGRALS  
VS. CURRENT TIME FOR TYPES F0805B AND F1206B (TYPICAL)  
100  
10  
1
10-1  
10-2  
3.00A  
2.50A  
2.00A  
1.50A  
1.25A  
1.00A  
0.75A  
0.50A  
10-3  
10-4  
10-5  
10-6  
0.25A  
0.15A  
0
10  
20  
30  
40  
50  
60  
Current, Amp  
Accu-Guard® II  
SMD Thin-Film Fuse  
FUSE PRE-ARC JOULE INTEGRALS  
VS. PRE-ARC TIME FOR TYPES F0805B AND F1206B (TYPICAL)  
100  
10  
1
10-1  
10-2  
10-3  
10-4  
3.00A  
2.50A  
2.00A  
1.50A  
1.25A  
1.00A  
0.75A  
0.50A  
0.25A  
10-5  
10-6  
0.15A  
10-7  
10-6  
10-5  
10-4  
10-3  
10-2  
10-1  
1
10  
Pre-Arc Time, Seconds  
20  
Accu-Guard® II  
SMD Thin-Film Fuse  
FUSE TIME - CURRENT CHARACTERISTICS  
FOR TYPE F0612D (TYPICAL)  
10  
1
10-1  
10-2  
10-3  
10-4  
10-5  
5.0A  
4.0A  
1
10  
100  
Current, Amp  
Accu-Guard® II  
SMD Thin-Film Fuse  
FUSE PRE-ARC JOULE INTEGRALS  
VS. PRE-ARC TIME FOR TYPE F0612D (TYPICAL)  
1000  
100  
10  
1
5.00A  
10-1  
4.00A  
10-2  
10-3  
10-4  
10-5  
10-6  
10-5  
10-4  
10-3  
10-2  
10-1  
1
10  
Pre-Arc Time, Seconds  
22  
Accu-Guard® II  
SMD Thin-Film Fuse  
FUSE PRE-ARC JOULE INTEGRALS  
VS. CURRENT FOR TYPE F0612D (TYPICAL)  
1000  
100  
10  
1
5.00A  
4.00A  
10-1  
10-2  
10-3  
10-4  
10-5  
0
10  
20  
30  
Current, Amp  
40  
50  
60  
Accu-Guard®  
SMD Thin-Film Fuse  
ELECTRICAL SPECIFICATIONS  
Operating Temperature: -55°C to +125°C  
Current carrying capacity at -55°C is 10ꢀ% of rating;  
at +25°C 100% of rating; at +85°C 93% of rating;  
at +125°C 90% of rating.  
Rated Voltage: 32V  
Interrupting Rating: 50A  
Insulation Resistance: >20MΩ guaranteed (after fusing at rated voltage)  
1206  
Current  
Resistance  
Voltage Drop  
Fusing Current  
Pre-Arc  
Part Number  
Rating @ 10% x I rated, 25°C @ 1 x I rated, 25°C (within 5 sec.) 25°C  
I2 t @ 50A  
A
Ω (Max.)  
0.95  
0.ꢀ5  
0.40  
0.35  
0.25  
0.18  
0.15  
0.11  
mV (Max.)  
350  
A
A2 - sec.  
F1206A0R20FWTR  
F1206A0R25FWTR  
F1206A0R3ꢀFWTR  
F1206A0R50FWTR  
F1206A0Rꢀ5FWTR  
F1206A1R00FWTR  
F1206A1R25FWTR  
F1206A1R50FWTR  
F1206A1Rꢀ5FWTR  
F1206A2R00FWTR  
0.200  
0.250  
0.3ꢀ5  
0.500  
0.ꢀ50  
1.000  
1.250  
1.500  
1.ꢀ50  
2.000  
0.40  
0.50  
0.ꢀ5  
1.00  
1.50  
2.00  
2.50  
3.00  
3.50  
4.00  
0.00002*  
0.00004*  
0.00006  
0.0002  
0.003  
0.005  
0.009  
0.02  
0.035  
280  
220  
220  
220  
220  
220  
220  
210  
0.10  
0.065  
160  
0.04  
* Current is limited to less than 50A at 32V due to internal fuse resistance.  
ENVIRONMENTAL CHARACTERISTICS  
Test  
Conditions  
Requirement  
Solderability  
Components completely immersed in a  
solder bath at 235 5°C for 2 secs.  
Completely immersed in a solder bath  
at 260 5°C for 60 secs.  
Terminations to be well tinned  
No visible damage  
Dissolution of termination  
≤ 25% of area  
Leach Resistance  
ΔR/R<10%  
Storage  
Shear  
12 months minimum with components  
stored in “as received” packaging.  
Components mounted to a substrate.  
A force of 5N applied normal to the  
line joining the terminations and in  
a line parallel to the substrate.  
Components mounted to a substrate.  
5 cycles -55°C to +125°C.  
Good solderability  
No visible damage  
Rapid Change of  
Temperature  
Vibration  
No visible damage  
Δ R/R<10%  
No visible damage  
ΔR/R<10%  
Per Mil-Std-202F  
Method 201A and  
Method 204D Condition D.  
Load Life  
25°C, I rated, 20,000 hrs.  
No visible damage  
ΔR/R<10%  
24  
Accu-Guard®  
SMD Thin-Film Fuse  
FUSE TIME - CURRENT CHARACTERISTICS  
FOR SIZE 1206 (TYPICAL)  
10  
0.20A  
0.25A  
0.375A  
0.50A  
0.75A  
1.00A  
1.25A  
1.50A  
1.75A  
2.00A  
1
10-1  
10-2  
10-3  
10-4  
10-5  
10-6  
0.1  
1
10  
100  
Current, Amp  
Accu-Guard®  
SMD Thin-Film Fuse  
FUSE PRE-ARC JOULE INTEGRALS VS. CURRENT  
FOR SIZE 1206 (TYPICAL)  
100  
10  
2.00A  
1.75A  
1
1.50A  
1.25A  
1.00A  
10-1  
10-2  
10-3  
0.75A  
10-4  
10-5  
0.50A  
0.375A  
0.25A  
0.20A  
40  
50  
60  
0
10  
20  
30  
Current, Amp  
26  
Accu-Guard®  
SMD Thin-Film Fuse  
FUSE PRE-ARC JOULE INTEGRALS  
VS. PRE-ARC TIME FOR SIZE 1206 (TYPICAL)  
100  
10  
1
10-1  
10-2  
10-3  
10-4  
2.00A  
1.75A  
1.50A  
1.25A  
1.00A  
0.75A  
0.50A  
0.375A  
0.25A  
0.20A  
10-5  
10-7  
10-6  
10-5  
10-4  
10-3  
10-2  
10-1  
1
10  
Pre-Arc Time, Seconds  
Accu-Guard®  
SMD Thin-Film Fuse  
QUALITY & RELIABILITY  
COMPONENT PAD DESIGN  
Component pads must be designed to achieve good joints  
and minimize component movement during soldering.  
Accu-Guard® series of fuses is based on established  
thin-film technology and materials used in the semiconduc-  
tor industry.  
Pad designs are given below for both wave and reflow  
soldering.  
In-line Process Control: This program forms an integral  
part of the production cycle and acts as a feedback sys-  
tem to regulate and control production processes. The  
test procedures, which are integrated into the production  
process, were developed after long research and are  
based on the highly developed semiconductor industry  
test procedures and equipment. These measures help  
AVX/Kyocera to produce a consistent and high yield line  
of products.  
The basis of these designs are:  
a. Pad width equal to component width. It is permissible to  
decrease this to as low as 85% of component width but  
it is not advisable to go below this.  
b. Pad overlap 0.5mm.  
c. Pad extension 0.5mm for reflow. Pad extension about  
1.0mm for wave soldering.  
Final Quality Inspection: Finished parts are tested for  
standard electrical parameters and visual/mechanical  
characteristics. Each production lot is 100% evaluated for  
electrical resistance. In addition, each production lot is  
evaluated on a sample basis for:  
PREHEAT & SOLDERING  
The rate of preheat in production should not exceed  
4°C/second. It is recommended not to exceed 2°C/  
second.  
Temperature differential from preheat to soldering should  
not exceed 150°C.  
• Insulation resistance (post fusing)  
• Blow time for 2 x rated current  
• Endurance test: 125°C, rated current, 4 hours  
For further specific application or process advice, please  
consult AVX.  
HANDLING AND SOLDERING  
HAND SOLDERING & REWORK  
SMD chips should be handled with care to avoid damage  
or contamination from perspiration and skin oils. The use  
of plastic tipped tweezers or vacuum pick-ups is strongly  
recommended for individual components. Bulk handling  
should ensure that abrasion and mechanical shock are  
minimized. For automatic equipment, taped and reeled  
product is the ideal medium for direct presentation to the  
placement machine.  
Hand soldering is permissible. Preheat of the PCB to 100°C  
is required. The most preferable technique is to use hot air  
soldering tools. Where a soldering iron is used, a tempera-  
ture controlled model not exceeding 30 watts should be  
used and set to not more than 260°C. Maximum allowed  
time at temperature is 1 minute.  
COOLING  
CIRCUIT BOARD TYPE  
All flexible types of circuit boards may be used  
(e.g. FR-4, G-10).  
After soldering, the assembly should preferably be allowed  
to cool naturally. In the event of assisted cooling, similar  
conditions to those recommended for preheating should  
be used.  
For other circuit board materials, please consult factory.  
REFLOW SOLDERING  
WAVE SOLDERING  
Dimensions: millimeters (inches)  
Dimensions: millimeters (inches)  
0.8  
0.85  
(0.033)  
0402  
0805  
0603  
0402  
0603  
(0.031)  
0.6  
(0.024)  
0805  
1.0  
(0.039)  
1.25  
(0.049)  
2.1  
(0.083)  
1.5  
0.5  
(0.020)  
(0.059)  
2.3  
(0.091)  
0.6  
(0.024)  
1.7  
(0.068)  
3.0  
0.5  
(0.020)  
(0.118)  
3.1  
(0.122)  
0.6  
(0.024)  
1.0  
0.8  
(0.031)  
4.0  
(0.157)  
(0.039)  
0.85  
1.0  
(0.039)  
(0.033)  
0.6  
(0.024)  
0.59  
(0.023)  
1.25  
(0.049)  
1.0  
(0.039)  
0.8  
(0.031)  
0.59  
(0.023)  
1.5  
(0.059)  
1.25  
(0.049)  
0.8  
(0.031)  
1206  
1.25  
1.0  
1206  
(0.049)  
0.85  
(0.039)  
0612  
1.5  
(0.033)  
(0.059)  
2.3  
(0.091)  
0.6 (0.024)  
1.25  
(0.049)  
0612  
4.0  
(0.157)  
0.85  
(0.033)  
5.0  
(0.197)  
2.0  
(0.079)  
3.1  
0.6 (0.024)  
2.0  
(0.079)  
3.1  
(0.122)  
(0.122)  
1.25  
(0.049)  
3.1  
(0.122)  
1.0  
(0.039)  
1.5  
(0.059)  
1.6  
(0.063)  
1.6  
(0.063)  
28  
Accu-Guard®  
SMD Thin-Film Fuse  
RECOMMENDED SOLDERING PROFILES  
CLEANING RECOMMENDATIONS  
Care should be taken to ensure that the devices are thor-  
oughly cleaned of flux residues, especially the space  
beneath the device. Such residues may otherwise become  
conductive and effectively offer a lousy bypass to the  
device. Various recommended cleaning conditions (which  
must be optimized for the flux system being used) are as  
follows:  
IR REFLOW  
220  
Assembly exits heat–  
210  
200  
190  
180  
170  
160  
150  
140  
130  
120  
110  
100  
90  
no forced cooldown  
Additional soak time  
to allow uniform  
heating of the  
substrate  
186°C solder melting  
temperature  
Assembly enters the  
preheat zone  
45-60 sec.  
above solder  
melting point  
Cleaning liquids . . . . . . . .i-propanol, ethanol, acetylace-  
tone, water, and other stan-  
dard PCB cleaning liquids.  
Ultrasonic conditions . . . .power – 20w/liter max. fre-  
quency – 20kHz to 45kHz.  
Soak time  
80  
1) Activates the flux  
2) Allows center of board  
temperatures to catch up with  
corners  
70  
60  
Temperature . . . . . . . . . .80°C maximum (if not other-  
wise limited by chosen solvent  
system).  
50  
40  
30  
20  
0
0.5  
1
1.5  
2
2.5  
3
3.5  
4
4.5  
Time . . . . . . . . . . . . . . . .5 minutes max.  
Time (mins)  
STORAGE CONDITIONS  
Recommended storage conditions for Accu-Guard®  
prior to use are as follows:  
Temperature  
Humidity  
15°C to 35°C  
≤65%  
WAVE SOLDERING  
Air Pressure  
860mbar to 1060mbar  
3–5 seconds  
260  
240  
220  
200  
100°C  
Natural  
Cooling  
180  
160  
140  
120  
100  
80  
Enter Wave  
60  
40  
Time (seconds)  
20  
0
10  
20  
30  
40  
50  
60  
70  
80  
90 100 110 120  
Transfer from  
VAPOR PHASE  
preheat with  
min. delay &  
temp. loss  
Preheat  
Reflow  
215°C  
215°C  
200  
180  
160  
140  
120  
100  
80  
200  
Duration varies  
with thermal mass  
of assembly  
Natural  
Cooling  
180  
160  
140  
120  
100  
80  
10–60 secs typical  
Enter  
Vapor  
60  
60  
40  
40  
20  
20  
0
0
10  
20  
30  
40  
50  
60  
70  
Time (minutes)  
Time (seconds)  
Accu-Guard®  
SMD Thin-Film Fuse  
PACKAGING  
Automatic Insertion Packaging  
Tape & Reel: All tape and reel specifications are in compliance with EIA 481-1  
— 8mm carrier  
— Reeled quantities: Reels of 3,000 or 10,000 pieces  
(for F0402: 5,000 or 20,000 pieces)  
G MAX.  
B*  
C
A
E
D*  
FULL RADIUS  
F
*DRIVE SPOKES OPTIONAL  
IF USED, ASTERISKED  
DIMENSIONS APPLY.  
REEL DIMENSIONS: millimeters (inches)  
A(1)  
B*  
C
D*  
E
F
G
180 + 1.0  
(ꢀ.08ꢀ + 0.039) (0.059 min.)  
1.5 min.  
13 0.2  
(0.512 0.008)  
20.2 min.  
(0.ꢀ95 min.)  
50 min.  
(1.969 min.)  
9.4 1.5  
(0.3ꢀ0 0.050)  
14.4 max.  
(0.56ꢀ max.)  
Metric dimensions will govern.  
Inch measurements rounded for reference only.  
(1) 330mm (13 inch) reels are available.  
10 PITCHES  
CUMULATIVE  
TOLERANCE ON  
TAPE 0.2  
E
D
F
C
TOP  
TAPE  
W
L
B
A
CENTER LINES  
OF CAVITY  
DIRECTION OF FEED  
P = 4mm except 0402 where P = 2mm  
CARRIER DIMENSIONS: millimeters (inches)  
A
B
C
D
E
F
+0.1  
8.0 0.3  
(0.315 0.012)  
3.5 0.05  
(0.138 0.002)  
1.ꢀ5 0.1  
(0.069 0.004)  
2.0 0.05  
(0.0ꢀ9 0.002)  
4.0 0.1  
(0.15ꢀ 0.004)  
1.5  
(0.059  
-0.0  
+0.004  
)
-0.000  
Note: The nominal dimensions of the component compartment (W,L) are derived from the component size.  
Note: AVX reserves the right to change the information published herein without notice.  
30  
Accu-Guard®  
SMD Thin-Film Fuse  
HOW TO CHOOSE THE CORRECT ACCU-GUARD® FUSE  
FOR CIRCUIT PROTECTION  
Correct choice of an Accu-Guard® fuse for a given applica-  
tion is fairly straightforward. The factor of pre-arc I2t, howev-  
er, requires clarification. The proper design for pre-arc I2t is  
presented by way of example.  
5. Switch-on and Other Pulse Current  
Many circuits generate a large current pulse when initially  
connected to power. There are also circuits which are sub-  
ject to momentary current pulses due to external sources;  
telephone line cards which are subject to lightning-induced  
pulses are one example. These current pulses must be  
passed by the fuse without causing actuation. These puls-  
es may be so large that they are the determining factor for  
choosing the Accu-Guard® current rating; not necessarily  
steady state current.  
DESIGN PARAMETERS  
1. Operating Temperature  
The Accu-Guard® is specified for operation in the tempera-  
ture range of -55°C to +125°C. Note, however, that fusing  
current is sensitive to temperature. This means that the fuse  
must be derated or uprated at circuit temperatures other  
than 25°C:  
In order to design for current pulses, the concept of fuse  
pre-arc Joule integral, I2t, must be understood. Fuse current  
rating is defined by the requirement that 2 x IR will cause  
actuation in <5 seconds. This rating does not indicate how  
the fuse will react to very high currents of very short duration.  
Rather, the fusing characteristic at very high currents is  
specified by I2t-t curves (or I2t-I).  
I2t expresses the amount of energy required to actuate the  
fuse. Total I2t expresses the total energy which will be  
passed by the fuse until total cessation of current flow.  
Pre-arc I2t expresses that energy required to cause large  
irreversible damage to the fuse element (Total I2t = pre-arc I2t  
+ arc I2t). If the Joule integral of the switch-on pulse is  
larger than the fuse pre-arc I2t, nuisance actuation will occur.  
Environmental  
Temperature  
Accu-Guard®  
Current Carrying Capacity*  
F0402E,  
F0603E  
F0805B, F1206A, F0805B 2.50A  
F0603C F0612D  
1.0ꢀ x IR 1.0ꢀ x IR  
F1206B  
1.0ꢀ x IR  
IR  
& 3.00A  
1.0ꢀ x IR  
IR  
-55°C to -11°C  
-10°C to 60°C  
61°C to 100°C  
101°C to 125°C  
1.0ꢀ x IR  
IR  
IR  
IR  
0.85 x IR  
0.80 x IR  
0.93 x IR  
0.90 x IR  
0.90 x IR  
0.90 x IR  
0.90 x IR 0.80 x IR  
0.ꢀ5 x IR 0.ꢀ5 x IR  
*As a function of nominal rated current, IR.  
In order to choose the proper Accu-Guard® current rating for  
a given application, it is necessary to calculate the I2t Joule  
integral of the circuit switch-on and other current pulses and  
compare them to the Accu-Guard® I2t-t curves. An Accu-  
Guard® fuse must be chosen such that the pulse I2t is no  
more than 50% of the pre-arc I2t of the prospective fuse.  
Pre-arc I2t of the Accu-Guard® fuses is well characterized;  
I2t-t and I2t-I graphs are in this catalog. The problem is cal-  
culating the I2t of the circuit current pulses. This concept is  
not familiar to most engineers. Correct calculation of pulse  
Joule integral and subsequent choice of Accu-Guard®  
current rating is illustrated by way of the attached examples.  
2. Circuit Voltage  
Maximum Voltage: Accu-Guard® is specified for circuits of  
up to rated voltage. Accu-Guard® will successfully break  
currents at higher voltages as well, but over voltage may  
crack the fuse body.  
Minimum Voltage: Accu-Guard® cannot be used in circuits  
with voltage of about 0.5V and less. The internal resistance  
of the fuse will limit the fault current to a value which will pre-  
vent reliable actuation of the fuse (<2 x rated current).  
3. Maximum Fault Current  
Accu-Guard® is fully tested and specified for fault currents  
up to 50A. Accu-Guard® will successfully break currents  
above 50A, but such over current may crack the fuse body  
or damage the fuse terminations.  
4. Steady-State Current  
The Accu-Guard® current rating is based on IEC Specifica-  
tion 12ꢀ-3. In accordance with this international standard,  
Accu-Guard® is specified to operate at least 4 hours at rated  
current without fusing (25°C). Engineering tests have shown  
that F0805B and F1206A/B Accu-Guard® will in fact operate  
at least 20,000 hours at rated current without fusing (25°C).  
Accu-Guard®  
SMD Thin-Film Fuse  
2. Triangular current pulse  
The Joule integral for triangular pulse is  
[(Imax.)2 x t]/3,  
DESIGNING FOR CURRENT  
PULSE SITUATIONS  
1. Sine wave current pulse  
The Joule integral for sine wave pulse is  
see Fig. 2a.  
[(Imax.)2 x t]/2,  
l max.  
see Fig. 1a.  
l max.  
t
Fig. 2a. Triangular pulse parameters for Joule  
t
integral calculation, example #2.  
Fig. 1a. Sine wave pulse parameters for Joule  
integral calculation, example #1.  
Thus, for the current pulse in Figure 1b, the Joule integral is  
[(4.8A)2 x ꢀ.ꢀ x 10-6 sec]/2 = 8.9 x 10-5 A2 sec.  
Thus, for the current pulse in Figure 2b, the Joule integral is  
[(1.5A)2 x 3 x 10-3 sec]/3 = 2.25 x 10-3 A2sec.  
2 msec/div  
10 μsec/div  
0.5A/div  
1A/div  
Fig. 1b. Sine wave pulse, example #1.  
Fig. 2b. Triangular pulse, example #2.  
The pulse duration is 3 msec. In the I2t graph on page 6, pre-  
arcing Joule integral for 3 msec pulse is 4 x 10-3A2sec for the  
0.5A fuse (not enough) and 2 x 10-2 for the 0.ꢀ5A fuse (more  
than enough). Therefore, 0.ꢀ5A fuse should be chosen for  
this application, see Figure 2c.  
The pulse duration is ꢀ.ꢀμsec. We must find a fuse that can  
absorb at least 8.9 x 10-5 X 2 = 1.8 x 10-4 A2sec Joule inte-  
gral within ꢀ.ꢀ μsec without actuation. According to the I2t  
graph on page 6, pre-arcing Joule integral is 2.3x10-4 A2sec  
for the 0.5A fuse, which is slightly more than needed. The  
next lower rating (0.3ꢀ5A), has only 6x10-5 A2sec, which is  
not enough. Therefore, 0.5A fuse should be chosen for this  
application, see Figure 1c.  
FUSE PRE-ARCING JOULE INTEGRALS  
vs. PRE-ARCING TIME  
PRE-ARCING TIME l2t, A2 sec  
100  
FUSE PRE-ARCING JOULE INTEGRALS  
vs. PRE-ARCING TIME  
10  
1
10-1  
PRE-ARCING TIME l2t, A2 sec  
100  
0.75A  
10  
1
10-2  
10-3  
x
10-4  
10-5  
10-1  
10-2  
0.5A  
10-3  
10-4  
10-7 10-6 10-5 10-4 10-3 10-2 10-1  
PRE-ARCING TIME, sec  
1
10  
x
Fig. 2c. Choice of 0.ꢀ5A fuse, example #2.  
Pre-arcing I2t  
10-5  
10-7 10-6 10-5 10-4 10-3 10-2 10-1  
PRE-ARCING TIME, sec  
1
10  
Maximum I2t design rule  
Fig. 1c. Choice of 0.5A fuse, example #1.  
X
I2t for sample switch-on pulse  
Pre-arcing I2t  
Maximum I2t design rule  
I2t for sample current pulse  
X
32  
Accu-Guard®  
SMD Thin-Film Fuse  
DESIGNING FOR CURRENT PULSE SITUATIONS (CONT.)  
3. Trapezoidal current pulse  
4. Lightning strike  
The Joule integral for a trapezoidal pulse is  
A lightning strike pulse is shown in Figure 4a. After an initial  
(Imin.)2 + Imin. x (Imax. - Imin.) + (Imax-Imin)2 x t,  
linear rise, the current declines exponentially.  
[
]
3
see Fig. 3a.  
l max.  
0.51 max.  
t0.5  
l max.  
l min.  
Fig. 4a. Lightning pulse parameters for Joule  
t
integral calculation, example #4.  
Fig. 3a. Trapezoidal pulse parameters for Joule  
Joule integral for the linear current rise is calculated as for a  
triangular pulse, see example #2.  
integral calculation, example #3.  
Thus, for current pulse in Figure 3b, the Joule integral is:  
The Joule integral for the exponential decline is  
Imax.2 x t0.5 x (-1/2In 0.5) = 0.ꢀ2Imax.2 x t0.5  
{(0.56A)2+0.56A x (1A-0.56A)+ (1A-0.56A)2 } x 3 x 10-3s = 1.9 x 10-3A2sec.  
[
]
3
Thus, for the sample lightning strike pulse in Figure 4b, the  
total Joule integral is:  
0.5 msec/div  
(25A)2 x 2 x 10-6sec/3+0.ꢀ2 x (25A)2 x 10 x 10-6sec = 4.92 x 10-3A2sec.  
10 μsec/div  
0.5A/div  
5A/div  
Fig. 3b. Trapezoidal pulse, example #3.  
According to the I2t graph on page 6, the 0.5A fuse should  
be chosen for this application, see Figure 3c.  
Fig. 4b. Lightning strike pulse, example #4.  
For practical calculations, the duration of exponential decline  
may be assumed to be 3t0.5, because within this time 98.5%  
of the pulse energy is released. Thus, the total pulse duration  
in this example is 30 μsec, and the 1.25A fuse should be  
chosen for this application, see Figure 4c.  
FUSE PRE-ARCING JOULE INTEGRALS  
vs. PRE-ARCING TIME  
PRE-ARCING TIME l2t, A2 sec  
100  
10  
1
10-1  
FUSE PRE-ARCING JOULE INTEGRALS  
vs. PRE-ARCING TIME  
PRE-ARCING TIME l2t, A2 sec  
10-2  
100  
x
0.50A  
10-3  
10-4  
10-5  
10  
1
10-1  
1.25A  
10-7 10-6 10-5 10-4 10-3 10-2 10-1  
PRE-ARCING TIME, sec  
1
10  
10-2  
x
10-3  
10-4  
10-5  
Fig. 3c. Choice of 0.5A fuse, example #3.  
Pre-arcing I2t  
Maximum I2t design rule  
10-7 10-6 10-5 10-4 10-3 10-2 10-1  
PRE-ARCING TIME, sec  
1
10  
I2t for sample switch-on pulse  
X
Fig. 4c. Choice of 0.5A fuse, example #4.  
Pre-arcing I2t  
Maximum I2t design rule  
I2t for sample switch-on pulse  
X
Accu-Guard®  
SMD Thin-Film Fuse  
DESIGNING FOR CURRENT PULSE SITUATIONS (CONT.)  
5. Complex current pulse  
6. Switch-on pulse and steady-state current  
In Figure 6a, the switch-on pulse is a triangle pulse with a  
5.1 x 10-3 A2sec Joule integral of 5 msec duration; the 0.ꢀ5A  
fuse will meet this requirement, see Figure 6b.  
If the pulse consists of several waveforms, all of them should  
be evaluated separately, and then the total Joule integral  
should be calculated as well.  
200 μsec/div  
2 msec/div  
2A/div  
0.5A/div  
Fig. 5a. Complex pulse, example #5.  
Fig. 6a. Switch-on pulse and steady-state current,  
example #6.  
In Figure 5a, the Joule integral for the first triangle is  
[(4.6ꢀA)2 x 294 x 10-6sec]/3=2.14 x 10-3 A2sec  
and 0.ꢀ5A fuse should meet this condition, see Figure 5b.  
FUSE PRE-ARCING JOULE INTEGRALS  
vs. PRE-ARCING TIME  
PRE-ARCING TIME l2t, A2 sec  
100  
FUSE PRE-ARCING JOULE INTEGRALS  
vs. PRE-ARCING TIME  
PRE-ARCING TIME l2t, A2 sec  
10  
1
10-1  
100  
0.75A  
10-2  
10-3  
10-4  
10-5  
x
10  
1
10-1  
0.75A  
10-2  
x
x
10-7 10-6 10-5 10-4 10-3 10-2 10-1  
PRE-ARCING TIME, sec  
1
10  
10-3  
10-4  
10-5  
Fig. 6b. Choice of 0.ꢀ5A fuse, example #6.  
Pre-arcing I2t  
10-7 10-6 10-5 10-4 10-3 10-2 10-1  
PRE-ARCING TIME, sec  
1
10  
Maximum I2t design rule  
I2t for sample switch-on pulse  
Fig. 5b. Choice of fuse, example #5.  
Pre-arcing I2t  
X
Maximum I2t design rule  
I2t for sample switch-on pulse  
The steady-state current is 0.5A, and 1A fuse is typically rec-  
ommended to meet the steady-state condition. Based on  
steady-state current, the 1A fuse should be chosen for this  
application.  
X
The Joule integral for the second triangle is  
[(5.33A)2 x 269 x 10-6sec]/3 = 2.55 x 10-3 A2sec, and  
0.ꢀ5A fuse is suitable for this case also, see Figure 5b.  
However, for the whole pulse, the Joule integral is  
4.ꢀ x 10-3 A2sec, and the total duration is 563 μsec. For the  
0.ꢀ5A fuse, the Joule integral is only 8.6 x 10-3 A2sec for this  
pulse duration, so the 1A fuse should be chosen for this  
application, see Figure 5b.  
34  
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