Littelfuse 253 Series PICO II - Manual (Page 3)

© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 02/25/14
Axial Lead & Cartridge Fuses
PICO ® ll > Very Fast-Acting > 251/253 Series
Average Time Current Curves
Soldering Parameters
100
10
1
0.1
0.01
0.001
.062A
0.05 0.1 1 10 100 1000
.1
25A
.250A .375A .50
0A
.750A .630A 1A 1.5A 2A 2.5A 3A 3.5A 4A 5A 7A 10
A
12
A
15
A
TIME IN SECONDS
CURRENT IN AMPERES
1.25A
Recommended Hand Soldering 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:
Note:
1. Rerating depicted in this curve is in addition to the standard rerating of 25% for
continuous operation.
Temperature Rerating Curve
Wave Parameter
Lead-Free Recommendation
for 251 Series only
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