Transientology
Thin Film > 1206 Size > Very Fast-Acting > 466 Series
Surface Mount Fuses
Introduction to Circuit Protection
Temperature Rerating Curve
Average Time Current Curves
1 1/4A
1 1/2A
1 3/4A
1/4A
3/8A
1/2A
1/8A
3/4A
2A
2 1/2A
3A
4A
5A
10
100
10
TIME IN SECONDS
1
0.1
Note:
1. Rerating depicted in this curve is in addition to the standard rerating of 25% for
continuous operation.
Example:
For continuous operation at 70 degrees celsius, the fuse should be rerated as 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
100
CURRENT IN AMPERES
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 seconds
5°C/second max.
5°C/second max.
217°C
60 – 150 seconds
250
+0/-5
1A
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
Time
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
°C
20 – 40 seconds
5°C/second max.
8 minutes max.
260°C
Wave Soldering
260°C, 10 seconds max.
466 Series
30
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/466.html for current information.
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