Littelfuse 239 Series - Manual (Page 3)

© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/26/13
Axial Lead & Cartridge Fuses
5×20 mm > Time Lag > 239 Series
Average Time Current Curves Temperature Rerating Curve
CURRENT IN AMPERES
10000
0.20
0A
0.250A 0.30
0A
0.40
0A
0.50
0A
0.60
0A
0.70
0A
0.750A 0.80
0A
1A 1.25A 1.6A 2A 2.5A 3A 3.1
5A
4A 5A 7A
1000
100
10
1
0.1
0.01
0.1 1 10 100 1000
0.001
TIME IN SECONDS
Soldering Parameters - Wave Soldering
Dwell Time
0
20
40
60
80
100
120
140
160
180
200
220
240
260
280
300
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240
Time (Seconds)
Temperature (°C) - Measured on bottom side of board
Cooling Time Preheat Time
Wave Parameter Lead-Free Recommendation
Preheat:
(Depends on Flux Activation Temperature) (Typical Industry Recommendation)
Temperature Minimum: 100 ° C
Temperature Maximum: 150 ° C
Preheat Time: 60-180 seconds
Solder Pot Temperature: 260 ° C Maximum
Solder Dwell Time: 2-5 seconds
Recommended Hand-Solder Parameters:
Solder Iron Temperature: 350° C +/- 5°C
Heating Time: 5 seconds max.
Note: These devices are not recommended for IR or
Convection Reflow process.
Recommended Process Parameters: