Transientology
Thin Film > 0603 Size > Very Fast-Acting > 467 Series
Surface Mount Fuses
Introduction to Circuit Protection
Temperature Rerating Curve
Average Time Current Curves
0.250 A
0.375 A
0.500 A
0.750 A
1.00 A
1.25 A
1.50 A
100
10
TIME IN SECONDS
1
0.1
Note:
1. Derating depicted in this curve is in addition to the standard derating of 25% for
continuous operation.
Example:
For continuous operation at 70 degrees celsius, the fuse should be deratedas follows:
I = (0.75)(0.80)I
RAT
= (0.60)I
RAT
2. The temperature derating curve represents the nominal conditions. For questions
about temperature derating curve, please consult Littelfuse technical support
for assistance.
0.01
0.001
0.1
1
10
CURRENT IN AMPERES
1.75 A
2.00 A
2.50 A
3.00 A
3.50 A
4.00 A
5.00 A
100
Soldering Parameters
Reflow Condition
- Temperature Min (T
s(min)
)
Pre Heat
- Temperature Max (T
s(max)
)
- Time (Min to Max) (t
s
)
Average ramp up rate (Liquidus Temp
(T
L
) to peak
T
S(max)
to T
L
- Ramp-up Rate
Reflow
- Temperature (T
L
) (Liquidus)
- Temperature (t
L
)
Pb – Free assembly
150°C
60 – 180 secs
5°C/second max
5°C/second max
217°C
60 – 150 seconds
250
+0/-5
T
P
T
L
Temperature
t
P
Ramp-up
Critical Zone
T
L
to T
P
200°C
T
S(max)
T
S(min)
Preheat
t
L
Ramp-down
t
S
time to peak temperature
(t 25ºC to peak)
25
Peak Temperature (T
P
)
Time within 5°C of actual peak
Temperature (t
p
)
Ramp-down Rate
Time 25°C to peak Temperature (T
P
)
Do not exceed
Time
°C
20 – 40 seconds
5°C/second max
8 minutes Max.
260°C
Wave Soldering
260°C, 10 seconds max.
467 Series
42
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/467.html for current information.
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