0440007.WR Datasheet, PDF (2/3 Pages) Littelfuse – Surface Mount Fuses Ceramic Fuse > 440 Series

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Temperature Derating Curve
Average Time Current Curves
140
120
100
80
60
40
-65 -45 -25 -5
15 35 55 75 95 115 135 155
TEMPERATURE (°C)
Note:
1. Derating depicted in this curve is in addition to the standard derating of 20% for
continuous operation.
Example:
For continuous operation at 75 degrees celsius, the fuse should be derated as follows:
I = (0.80)(0.85)I_RAT = (0.68)I_RAT
Soldering Parameters
Reflow Condition
Pb-free assembly
- 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)
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
150°C
200°C
60 – 180 seconds
3°C/second max.
5°C/second max.
217°C
60 – 150 seconds
260^+0/-5 °C
10 – 30 seconds
6°C/second max.
8 minutes max.
260°C
Wave Soldering
260°C, 10 seconds max.
100
10
1
0.1
0.01
0.001
0.1
1.0
10.0
100.0
CURRENT IN AMPERES
1000.
T_P
T_L
T_S(max)
Ramp-up
T_S(min)
25
Preheat
t_S
time to peak temperature
(t 25ºC to peak)
t_P
Critical Zone
TL to TP
t_L
Ramp-down
Time
440 Series
2
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/440.html for current information.