Littelfuse 449 Series - Manual (Page 3)

© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 01/23/14
Surface Mount Fuses
NANO 2® > Slo-Blo ® > 449 Series
1 A
T
6.86
(.270")
3.15
(.124")
2.95
(.116") 1.96
(.077")
2.69 ± .25
(.106")
2.69 ± .25
(.106")
1.45
(.057")
6.10 ± .20
(.240")
Recommended pad layout
F
Materials
Body: Ceramic
Terminations: Gold-plated Caps
Product Marking Brand, Amperage Rating
Operating
Temperature
-55°C to 125°C
Moisture
Sensitivity Level
Level 1, J-STD-020C
Solderability MIL-STD-202, Method 208
Insulation
Resistance (after
Opening)
MIL-STD-202, Method 302, Test Condition
A (10,000 ohms minimum)
Thermal Shock
MIL-STD-202, Method 107, Test
Condition B, 5 cycles, -65°C to
125°C, 15 minutes @ each extreme
Mechanical Shock
MIL-STD-202, Method 213, Test I:
Deenergized. 100G’s pk amplitude,
sawtooth wave 6ms duration, 3
cycles XYZ+xyz = 18 shocks
Vibration
MIL-STD-202, Method 201: 0.03"
amplitude, 10-55 Hz in 1 min. 2hrs
each XYZ=6hrs
Moisture Resistance MIL-STD-202, Method 106, 10 cycles
Salt Spray
MIL-STD-202, Method 101, Test
Condition B (48hrs)
Resistance to Soldering
Heat MIL-STD-202, Method 210, Test
condition B (10 sec at 260°C)
Product Characteristics
Dimensions
Packaging
Part Numbering System
packaging Option packaging Specification Quantity
Quantity &
packaging code
12mm Tape and Reel EIA RS-481-2 (IEC 286, part 3) 1000 MR
0449 001. M R
SERIES
AMP Code*
QuANTITy Code
PACkAgINg Code
Refer to Electrical charac-
teristics table
M = 1000 pcs
R = Tape and Reel
*Example:
0.375 Amp product is 0449.375MR
(1 amp product shown above).