Littelfuse 242 Series - Manual (Page 2)

© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 01/23/14
Special Application Fuses
242 Series Barrier Network Fuse
Average Time Current Curves
0.1
0.01
0.001
0.0001
1
10
100
TIME IN SECONDS
.050A .080A .100A .200A .125A .160A .250A
0.01 0.1 1 10 100 1000
CURRENT IN AMPERES
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 – 180 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 – 150 seconds
Peak Temperature (T
P
) 250 +0/-5 °C
Time within 5°C of actual peak Temp. (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
Product Characteristics
Dimensions
3.02 mm
(.119")
8.40 mm
(.331")
4.00mm
4.60 mm
(.181")
1.90 mm
(.075")
3.02 mm
(.119")
8.40 mm
(.331")
4.60 mm
(.181")
2.90mm
3.20mm
9.80mm
1.90 mm
(.075")
.635 mm
(.025")
Operating Temperature –40 O C to 125 O C.
Thermal Shock
Withstands 5 cycles of – 55 O C to
125 O C
Vibration Per MIL-STD-202F
Insulation Resistance
(After Opening)
Greater than 10,000 ohms.
Part Numbering System
0242.050UAT1
SERIES
AmP CODE
QUANTITY & PACkAgINg CODE
Refer to Amp Code column in the
Electrical Specifications table.
HAT1 = 100 pcs, Axial Leaded, Ammo Pack T1 Tape
UAT1 = 500 pcs, Axial Leaded, Ammo Pack T1 Tape
UR = 500 pcs, Surface Mount, Tape & Reel
Wave Soldering 260°C, 10 seconds max.
Time
T
e
mperatur
e
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