Radial lead fuses, Average time current curves – Littelfuse 279 Series User Manual
Page 2
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/19/13
Radial Lead Fuses
MICRO™ > Very Fast-Acting > 272/273/274/278/279 Series
Average Time Current Curves
100
10
1
0.1
0.01
0.001
1
10
100
0.01
0.1
0.005
1/64 A
1/100 A
1/200 A
1/32 A
1/16 A
1/8 A
1/4 A
1/2 A 3/4 A 1 A
1 1/2 A 2 A 3 A 4 A 5 A
TIME IN SECONDS
CURRENT IN AMPERES
Temperature Rerating Curve
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: