0468001.NR Datasheet, PDF (2/3 Pages) Littelfuse – Surface Mount Fuses Thin Film > 1206 Size > Slo-Blo® > 468 Series

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Temperature Rerating Curve
Average Time Current Curves
100
10
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.
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 secs
5°C/second max
5°C/second max
217°C
60 – 150 seconds
250^+0/-5 °C
20 – 40 seconds
5°C/second max
8 minutes Max.
260°C
Wave Soldering
260°C, 10 seconds max.
0.01
0.001
0
1
10
100
Current in Amperes
T_P
T_L
T_S(max)
Ramp-up
T_S(min)
Preheat
t_S
25
time to peak temperature
(t 25ºC to peak)
t_P
Critical Zone
TL to TP
t_L
Ramp-down
Time
468 Series
38
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/468.html for current information.