449 Series Datasheet by Littelfuse Inc.

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© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/06/18
Surface Mount Fuses
NANO > Slo-Blo® Fuse > 449 Series
449 Series Fuse
Description
The lead free NANO Slo-Blo® fuse is RoHS compliant,
Halogen Free and 100% lead-free. This product is fully
compatible with lead-free solder alloys and higher
temperature profiles associated with lead-free assembly.
The Slo-Blo® fuse design has enhanced inrush withstand
characteristics over the NANO Fast-Acting Fuse. The
unique time delay feature of this fuse design helps solve the
problem of nuisance opening” by accommodating inrush
currents that normally cause a fast-acting fuse to open.
Agency Approvals
AGENCY AGENCY FILE NUMBER AMPERE RANGE
E10480 0.375A - 5A
PS
ENBK030205-E10480B 1A - 5A
Electrical Characteristics for Series
Features
RoHS
Pb
% of Ampere
Rating Opening Time
100% 4 hours, Minimum
200% 1 sec., Min.; 60 sec., Max.
300% 0.2 sec., Min.; 3 sec., Max
800% 0.002 sec., Min.; 0.1 sec., Max.
Electrical Specifications by Item
Ampere
Rating
(A)
Amp Code
Max
Voltage
Rating
(V)
Interrupting
Rating
Nominal Cold
Resistance
(Ohms)
Nominal
Melting
I2t (A2sec)
Agency Approvals
PS
E
0.375 .375 125
50A @125 VAC/VDC
PSE: 100A @100 VAC
1.5130 0.088 x
0.500 .500 125 0.7633 0.258 x
0.750 .750 125 0.4080 0.847 x
1. 0 0 0 01. 125 0.2516 1. 76 xx
1.50 01. 5 125 0.1186 4.70 xx
2.00 002. 125 0.0708 6.76 xx
2.50 02.5 125 0.0400 13.18 xx
3.00 003. 125 0.0352 19.55 xx
3.50 03.5 125 0.0261 32.70 xx
4.00 004. 125 0.0227 40.80 xx
5.00 005. 125 0.0171 59.59 x x
Applications
Notebook PC
LCD/PDP TV
LCD monitor
LCD/PDP panel
LCD backlight inverter
Portable DVD player
Power supply
• Networking
PC server
Cooling fan system
Storage system
Telecom system
Wireless basestation
White goods
Game console
• Office Automation
equipment
Battery charging circuit
protection
Industrial equipment
Secondary protection for space constrained applications:
Lead-free, Halogen free
and RoHS compliant
Small size
Wide range of current
ratings available
Wide operating
temperature range
Low temperature
rerating
PS
E
Notes: - l2t calculated at 8ms. Resistance is measured at 10% of rated current, 25ºC
Additional Information
Datasheet Samples
Resources
Application testing is strongly recommended.
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© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/06/18
Surface Mount Fuses
NANO > Slo-Blo® Fuse > 449 Series
Reflow Condition Pb – Free assembly
Pre Heat
- Temperature Min (Ts(min))150°C
- Temperature Max (Ts(max))200°C
- Time (Min to Max) (ts)60 – 120 secs
Average ramp up rate (Liquidus Temp
(TL) to peak 3°C/second max.
TS(max) to TL - Ramp-up Rate 3°C/second max.
Reflow - Temperature (TL) (Liquidus) 217°C
- Temperature (tL)60 – 90 seconds
Peak Temperature (TP)260+0/–5 °C
Time within 5°C of actual peak
Temperature (tp)20 – 40 seconds
Ramp-down Rate 5°C/second max.
Time 25°C to peak Temperature (TP)8 minutes max.
Do not exceed 260°C
Soldering Parameters
Average Time Current CurvesTemperature Re-rating Curve
TIME IN SECONDS
CURRENT IN AMPERES
0.01
0.1
1
10
100
1000
0110 100
3A
4A
5A
1.5A
1A
.750A
.500A
.375A
2.5A
2A
3.5A
Note:
1. Rerating depicted in this curve is in addition to the standard derating of 25% for
continuous operation.
Wave Soldering Parameters
260°C Peak
Temperature,
3 seconds max.
Time
Temperature
TP
TL
TS(max)
TS(min)
25
tP
tL
tS
time to peak temperature
(t 25ºC to peak)
Ramp-down
Ramp-up
Preheat
Critical Zone
TL to TP
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© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/06/18
Surface Mount Fuses
NANO > Slo-Blo® Fuse > 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-020
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).
Disclaimer Notice - Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military,
aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other
application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those
expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any
purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products
used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is
subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. Information furnished is believed to be accurate and reliable.
However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not
designed for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics.

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