303 Datasheet, PDF (2/3 Pages) DB Lectro Inc – SCREW TYPE SERIES

Radial Lead Fuses
TR3^® > Fast-Acting > 303 Series
FAST ACTING DE-RATING CURVE
Temperature Rerating Curve
140
120
100
80
60
40
23°C
20
0
-40
-20
0
20
40
60
80
AMBIENT TEMPERATURE (°C)
Average Time Current Curves
TR3 / No. 303
I-t Characteristics
(Min-Max Limit)
UL 248-14
Test value
Soldering Parameters - Wave Soldering
300
280
260
240
220
200
180
160
140
120
100
80
60
40
20
0
Time (Seconds)
Preheat Time
Dwell Time
Cooling Time
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/19/13
1
1.5 2
3
4 5 6 7 8 9 10
15
I_Fault / I_Rated
Contact Littelfuse for individual I-t curves
Recommended Process Parameters:
Wave Parameter
Preheat:
(Depends on Flux Activation Temperature)
Temperature Minimum:
Temperature Maximum:
Preheat Time:
Lead-Free Recommendation
(Typical Industry Recommendation)
100° C
150° C
60-180 seconds
Solder Pot Temperature:
Solder Dwell Time:
260° C Maximum
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.