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. Con struct ed on
alumina substrates, Accu-Guard®II fuses display superior
electrical, mechanical and en vi ron men tal properties.
Accu-Guard®II dimensions are standard 0402, 0603,
0805, 1206 and 0612 chip sizes, see page 2.
ELECTRICAL SPECIFICATIONS
Operating temperature: -55°C to +125°C
Current carrying capacity:
For F0402E and F0603E at -55°C 107% of rating, at -25°C
100% of rating, at +125°C 80% of rating. For F0603C at
-55°C is 107% of rating, at +25°C 100% of rating, at +85°C
90% of rating, at +125°C 75% 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 I2t @ 50A Voltage
A Ω (max.) mV (max.) A A2-sec V
F0402E0R25FSTR 0.25 0.650 220 0.625 0.00005* 32
F0402E0R50FSTR 0.50 0.250 180 1.25 0.0003 32
F0402E F0402E0R75FSTR 0.75 0.200 180 1.875 0.003 32
F0402E1R00FSTR 1.00 0.130 160 2.50 0.008 32
F0402E1R50FSTR 1.50 0.060 140 3.75 0.03 32
F0402E2R00FSTR 2.00 0.040 120 5.00 0.06 32
F0603E0R25FSTR 0.25 0.650 220 0.625 0.00005* 32
F0603E0R37FSTR 0.375 0.450 220 0.940 0.0001 32
F0603E0R50FSTR 0.50 0.250 180 1.25 0.0003 32
F0603E0R75FSTR 0.75 0.200 180 1.875 0.003 32
F0603E1R00FSTR 1.00 0.130 160 2.50 0.008 32
F0603E F0603E1R25FSTR 1.25 0.090 140 3.125 0.01 32
F0603E1R50FSTR 1.50 0.060 140 3.75 0.03 32
F0603E1R75FSTR 1.75 0.050 120 4.375 0.04 32
F0603E2R00FSTR 2.00 0.040 120 5.00 0.06 32
F0603E2R50FSTR 2.50 0.035 100 6.25 0.12 32
F0603E3R00FSTR 3.00 0.030 100 7.50 0.25 32
F0603C0R25FWTR 0.25 0.800 280 0.50 0.00003* 32
F0603C0R37FWTR 0.375 0.500 280 0.75 0.0001 32
F0603C0R50FWTR 0.50 0.320 280 1.00 0.0002 32
F0603C0R75FWTR 0.75 0.300 280 1.50 0.0015 32
F0603C1R00FWTR 1.00 0.200 240 2.00 0.004 32
F0603C F0603C1R25FWTR 1.25 0.170 240 2.50 0.007 32
F0603C1R50FWTR 1.50 0.110 240 3.00 0.012 32
F0603C1R75FWTR 1.75 0.090 240 3.50 0.02 24
F0603C2R00FWTR 2.00 0.075 240 4.00 0.03 24
F0603C2R50FWTR 2.50 0.055 200 5.00 0.05 16
F0603C3R00FWTR 3.00 0.045 200 6.00 0.1 16
F0805B0R25FW/STR 0.25 0.750 280 0.50 0.00003* 63
F0805B0R50FW/STR 0.50 0.350 280 1.00 0.0002 63
F0805B0R75FW/STR 0.75 0.270 280 1.50 0.001 63
F0805B1R00FW/STR 1.00 0.220 280 2.00 0.003 63
F0805B F0805B1R25FW/STR 1.25 0.170 280 2.50 0.007 63
F0805B1R50FW/STR 1.50 0.120 240 3.00 0.010 63
F0805B2R00FW/STR 2.00 0.080 220 4.00 0.030 63
F0805B2R50FW/STR 2.50 0.060 220 5.00 0.050 63
F0805B3R00FW/STR 3.00 0.050 220 6.00 0.10 63
F1206B0R25FW/STR 0.25 0.750 280 0.50 0.00003 63
F1206B0R50FW/STR 0.50 0.350 280 1.00 0.0002 63
F1206B F1206B1R00FW/STR 1.00 0.180 240 2.00 0.003 63
F1206B1R50FW/STR 1.50 0.120 240 3.00 0.010 63
F1206B2R00FW/STR 2.00 0.080 220 4.00 0.030 63
F1206B3R00FW/STR 3.00 0.050 220 6.00 0.10 63
F0612D F0612D4R00FWTR 4.00 0.040 260 10 0.10 32
F0612D5R00FWTR 5.00 0.025 200 12.5 0.25 32
For F1206B and F0805B at -55°C is 107% 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).
For F0612D at -55°C 107% of rating, at +25°C 100% of
rating, at +85°C 80% of rating, at +125°C 75% of rating.
*Current is limited to less than 50A at 32V due to internal fuse resistance.
8
Accu-Guard® II
SMD Thin-Film Fuse
Test Conditions Requirement
Solderability Components completely immersed in a Terminations to be well tinned
solder bath at 235 ±5°C for 2 secs. No visible damage
Leach Resistance Completely immersed in a solder bath Dissolution of termination
at 260 ±5°C for 60 secs. ≤ 25% of area
ΔR/R<10%
Storage 12 months minimum with components Good solderability
stored in “as received” packaging.
Shear Components mounted to a substrate. No visible damage
A force of 5N applied normal to the
line joining the terminations and in
a line parallel to the substrate.
Rapid Change of Components mounted to a substrate. No visible damage
Temperature 50 cycles -55°C to +125°C. Δ R/R<10%
Vibration Per Mil-Std-202F No visible damage
Method 201A and ΔR/R<10%
Method 204D Condition D.
Bend Tested as shown in diagram No visible damage
ΔR/R<10%
Load Life 25°C, rated current, 20,000 hrs. No visible damage
F0805B, F1206B ΔR/R<10%
ENVIRONMENTAL CHARACTERISTICS
45mm 45mm
3 mm�
Deflection
Accu-Guard® II
Lead-Free SMD Thin-Film Fuse
0.1
1
10
100
Current, Amp
Pre-
A
rc
Time,
sec
10
-2
10
-1
10
-3
1
10
10
-6
10
-5
10
-4
2.0
A
1.5
A
1.0
A
0.5
A
0.25
A
0.75
A
FUSE TIME – CURRENT CHARACTERISTICS
FOR TYPE F0402E (TYPICAL)
10
Accu-Guard® II
Lead-Free SMD Thin-Film Fuse
100
10
1
10-1
10-2
10-3
10-4
10-5
10-6
0
10
20
30
40
50
60
Current, Amp
Pre-
Arc
I
2
t,
A
2
sec
2.0
A
1.5
A
1.0
A
0.5
A
0.2 5
A
0.7 5
A
FUSE PRE-ARC JOULE INTEGRALS VS CURRENT
FOR TYPE F0402E (TYPICAL)
Accu-Guard® II
Lead-Free SMD Thin-Film Fuse
0
0
0
0
0
0
0
100
0
0
0
0
0
0
0
Pre-Arc Time, sec
Pre-
A
rc I
2
t,
A
2
sec
10
-2
10
-1
10
-3
1
100
10
-6
10
-5
10
-4
10
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
1
10
2.0
A
1.5
A
1.0
A
0.5
A
0.25
A
0.75
A
FUSE PRE-ARC JOULE INTEGRALS VS PRE-ARC TIME
FOR TYPE F0402E (TYPICAL)
12
Accu-Guard® II
Lead-Free SMD Thin-Film Fuse
10
1
10-1
10-2
10-3
10-4
10-5
10-6
0.1 1 10 100
Current, Amp
Pre-
Arc
Time,
sec
2.0
A
2.5
A
3.0
A
1.5
A
1.75
A
1.0
A
0.5
A
0.7 5
A
0.375
A
0.2 5
A
1.25
A
FUSE TIME – CURRENT CHARACTERISTICS
FOR TYPE F0603E (TYPICAL)
Accu-Guard® II
Lead-Free SMD Thin-Film Fuse
0102030405060
Current, Amp
Pre-Arc I2t, A2sec
100
10
1
10-1
10-2
10-3
10-4
10-5
10-6
3.0A
2.5A
2.0A
1.75A
1.5A
1.25A
1.0A
0.75A
0.5A
0.375A
0.25A
FUSE PRE-ARC JOULE INTEGRALS VS CURRENT
FOR TYPE F0603E (TYPICAL)
14
Accu-Guard® II
Lead-Free SMD Thin-Film Fuse
Pre-Arc Time, sec
Pre-
Arc I
2
t,
A
2
sec
10
-2
10
-1
10
-3
1
100
10
-6
10
-5
10
-4
10
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
110
3.0A
2.5A
2.0A
1.75A
1.5A
1.25A
1.0A
0.75A
0.5A
0.375A
0.25A
FUSE PRE-ARC JOULE INTEGRALS VS PRE-ARC TIME
FOR TYPE F0603E (TYPICAL)
Accu-Guard® II
SMD Thin-Film Fuse
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
1
10
0.1 1 10
Current, Amp
Pre-Arc Time, Seconds
100
10-2
10-3
10-4
10-5
10-6
FUSE TIME - CURRENT CHARACTERISTICS
FOR TYPE F0603C (TYPICAL)
16
Accu-Guard® II
SMD Thin-Film Fuse
10-1
1
10
100
Pre-Arc I2t, A2sec
Current, Amp
10-2
10-3
10-4
10-5
10-6
50403020100 60
3.00A
2.50A
2.00A
1.75A
1.50A
1.25A
1.00A
0.75A
0.50A
0.375A
0.25A
0.15A
FUSE PRE-ARC JOULE INTEGRALS
VS. CURRENT FOR TYPE F0603C (TYPICAL)
Accu-Guard® II
SMD Thin-Film Fuse
10-1
1
10
100
Pre-Arc I2t, A2sec
Pre-Arc Time, Seconds
10-2
10-3
10-4
10-5
10-6
10-7 10-6 10-5 10-4 10-3 10-2 10-1 110
3.00A
2.50A
2.00A
1.75A
1.50A
1.25A
1.00A
0.75A
0.50A
0.375A
0.25A
0.15A
FUSE PRE-ARC JOULE INTEGRALS
VS. PRE-ARC TIME FOR TYPE F0603C (TYPICAL)
18
Accu-Guard® II
SMD Thin-Film Fuse
FUSE TIME - CURRENT CHARACTERISTICS
FOR TYPES F0805B AND F1206B (TYPICAL)
Accu-Guard® II
SMD Thin-Film Fuse
10-1
1
10
100
Pre-Arc I2t, A2sec
Current, Amp
10-2
10-3
10-4
10-5
10-6
50403020100 60
3.00A
2.50A
2.00A
1.50A
1.25A
1.00A
0.75A
0.50A
�
0.25A
0.15A
FUSE PRE-ARC JOULE INTEGRALS
VS. CURRENT TIME FOR TYPES F0805B AND F1206B (TYPICAL)
20
Accu-Guard® II
SMD Thin-Film Fuse
10-1
1
10
100
Pre-Arc I2t, A2sec
Pre-Arc Time, Seconds
10-2
10-3
10-4
10-5
10-6
10-7 10-6 10-5 10-4 10-3 10-2 10-1 110
3.00A
2.50A
2.00A
1.50A
1.25A
1.00A
0.75A
0.50A
0.25A
0.15A
FUSE PRE-ARC JOULE INTEGRALS
VS. PRE-ARC TIME FOR TYPES F0805B AND F1206B (TYPICAL)
Accu-Guard® II
SMD Thin-Film Fuse
10-1
1
10
110
Current, Amp
Pre-Arc Time, Seconds
100
10-2
10-3
10-4
10-5
4.0A
5.0A
FUSE TIME - CURRENT CHARACTERISTICS
FOR TYPE F0612D (TYPICAL)
22
Accu-Guard® II
SMD Thin-Film Fuse
10-1
1
10
100
1000
Pre-Arc I2t, A2sec
Pre-Arc Time, Seconds
10-2
10-3
10-4
10-5
11010-6 10-5 10-4 10-3 10-2 10-1
�
�
5.00A
4.00A
FUSE PRE-ARC JOULE INTEGRALS
VS. PRE-ARC TIME FOR TYPE F0612D (TYPICAL)
Accu-Guard® II
SMD Thin-Film Fuse
10-1
1
10
100
1000
Pre-Arc i2t, A2sec
Current, Amp
10-2
10-3
10-4
10-5
50403020100 60
5.00A
4.00A
FUSE PRE-ARC JOULE INTEGRALS
VS. CURRENT FOR TYPE F0612D (TYPICAL)