
© 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-platedCaps
Product Marking Brand, Amperage Rating
Operating
Temperature
-55°C to 125°C
Moisture
Sensitivity Level
Level1,J-STD-020C
Solderability MIL-STD-202,Method208
Insulation
Resistance (after
Opening)
MIL-STD-202,Method302,TestCondition
A (10,000 ohms minimum)
Thermal Shock
MIL-STD-202,Method107,Test
Condition B, 5 cycles, -65°C to
125°C, 15 minutes @ each extreme
Mechanical Shock
MIL-STD-202,Method213,TestI:
Deenergized.100G’spkamplitude,
sawtooth wave 6ms duration, 3
cyclesXYZ+xyz=18shocks
Vibration
MIL-STD-202,Method201:0.03"
amplitude,10-55Hzin1min.2hrs
eachXYZ=6hrs
Moisture Resistance MIL-STD-202,Method106,10cycles
Salt Spray
MIL-STD-202,Method101,Test
Condition B (48hrs)
Resistance to Soldering
Heat
MIL-STD-202,Method210,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 EIARS-481-2(IEC286,part3) 1000 MR
0449 001. M R
SERIES
AMP Code*
QUANTITY Code
PACKAGING Code
Refer to Electrical charac-
teristics table
M=1000pcs
R=TapeandReel
*Example:
0.375 Amp product is 0449.375MR
(1 amp product shown above).
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