Brochure

© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/03/17
Surface Mount Fuses
NANO
2®
> 157 Fuse and Holder Combination
Average Time Current Curves
Reflow Condition Pb – Free assembly
Pre Heat
- Temperature Min (T
s(min)
) 150°C
- Temperature Max (T
s(max)
) 200°C
- Time (Min to Max) (t
s
) 60 – 120 secs
Average ramp up rate (Liquidus Temp
(T
L
) to peak
5°C/second max.
T
S(max)
to T
L
- Ramp-up Rate 5°C/second max.
Reflow
- Temperature (T
L
) (Liquidus) 217°C
- Temperature (t
L
) 60 – 90 seconds
Peak Temperature (T
P
) 260
+0/–5
°C
Time within 5°C of actual peak
Temperature (t
p
)
20 – 40 seconds
Ramp-down Rate 5°C/second max.
Time 25°C to peak Temperature (T
P
) 8 minutes max.
Do not exceed 260°C
Soldering Parameters
Temperature Re-rating Curve
0.001
0.01
0.1
1
10
100
0.01 0.1 1 10 100 1000 10000
TIME IN SECONDS
CURRENT IN AMPS
8A 10A
5A 6.3A 7A 3.5A
3.15A 3A
4A
2.5A 2A 1.5A 1.25A 1A 800mA 750mA 630mA 500mA
375mA
400mA
315mA
250mA
200mA
100mA
125mA
160mA
80mA 62mA
1.6A
Note:
1. Rerating depicted in this curve is in addition to the standard derating of 25% for
continuous operation.
Time
Temperature
T
P
T
L
T
S(max)
T
S(min)
25
t
P
t
L
t
S
time to peak temperature
(t 25ºC to peak)
Ramp-down
Ramp-up
Preheat
Critical Zone
T
L
to T
P