Datasheet

Introduction to Circuit Protection
Introduction to Circuit Protection
Transientology
62
© 2009 Littelfuse, Inc.
Specications are subject to change without notice.
Surface Mount Fuses
452/454 Series
NANO
2®
> Slo-Blo
®
> 452/454 Series
Please refer to www.littelfuse.com/series/452.html
or /454.html for current information.
Average Time Current Curves
Reow Condition Pb – Free assembly
Pre Heat
- Temperature Min (T
s(min)
) ¡$
- Temperature Max (T
s(max)
) ¡$
- Time (Min to Max) (t
s
) 60 – 120 secs
Average ramp up rate (Liquidus Temp
(T
L
) to peak
¡$TFDPOENBY
T
S(max)
to T
L
- Ramp-up Rate ¡$TFDPOENBY
Reow
- Temperature (T
L
) (Liquidus) ¡$
- Temperature (t
L
) 60 – 90 seconds
Peak Temperature (T
P
) 

¡$
Time within 5°C of actual peak
Temperature (t
p
)
20 – 40 seconds
Ramp-down Rate ¡$TFDPOENBY
Time 25°C to peak Temperature (T
P
) 8 minutes max.
Do not exceed ¡$
Wave Soldering Parameters
¡$1FBL
Temperature,
TFDPOETNBY
Soldering Parameters
Temperature Rerating Curve
Note:
 %FSBUJOHEFQJDUFEJOUIJTDVSWFJTJOBEEJUJPOUPUIFTUBOEBSEEFSBUJOHPGGPS
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
0.01
0.1
1
10
100
0.1 1 10 100 1000
TIME IN SECONDS
CURRENT IN AMPS
375mA 500mA
1.00A 1.50A 2.00A 2.50A 3.00A 3.50A 4.00A 5.00A 7.00A
750mA
8.00A 12.0A