Littelfuse 312 Series - Manual (Page 3)

© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/19/13
Axial Lead & Cartridge Fuses
3AG > Fast Acting > 312/318 Series
Average Time Current Curves
1000
100
10
1
0.1
0.01
1 10 100 0.01 0.1
.062
A
.125
A
.250
A
.375
A
.500
A
.750
A
1
A
1.5
A
2
A
2.5
A
3
A
4
A
5
A
6
A
7
A
8
A
10
A
0.005
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:
Please contact Littelfuse for more details on those T-C Curves of other ampere
ratings which are not published.