© 2015 Littelfuse, Inc.

Specifications are subject to change without notice.

Revised: 11/11/15

Axial Lead & Cartridge Fuses

Average Time Current Curves

Soldering Parameters

100

10

1

0.1

0.01

0.001

0.05 0.1

110100

1000

CURRENT IN AMPERES

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. Re-rating depicted in this curve is in addition to the standard derating of 25% for

continuous operation.

Temperature Re-rating Curve

Wave Parameter

Lead-Free Recommendation

for 251 Series only

Preheat:

(Depends on Flux Activation Temperature)

(Typical Industry Recommendation)

Temperature Minimum:

100

Temperature Maximum:

150

Preheat Time:

60-180 seconds

Solder PotTemperature:

260

Solder DwellTime:

2-5 seconds