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© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/03/17
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 Re-rating 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.
Note:
Rerating depicted in this curve is in addition to the industry practice derating
of 25% for continuous operation.