LITTELFUSE 449

Surface Mount Fuses
NANO2® > Slo-Blo® > 449 Series
449 Series Fuse
PS
E
Description
Features
t -FBEGSFFBOE)BMPHFO
Free
t 4MP#MP®
t 4NBMMTJ[F
t 8JEFSBOHFPGDVSSFOU
ratings available
Agency Approvals
AGENCY
AGENCY FILE NUMBER
AMPERE RANGE
E10480
375mA - 5A
NBK030205
1A - 5A
PS
E
Applications
Secondary protection for space constrained applications:
t 5FMFDPNTZTUFN
t /PUFCPPL1$
t 8JSFMFTTCBTFTUBUJPO
t -$%1%157
t 8IJUFHPPET
t -$%NPOJUPS
t (BNFDPOTPMF
t -$%1%1QBOFM
t 0GåDF"VUPNBUJPO
t -$%CBDLMJHIUJOWFSUFS
equipment
t 1PSUBCMF%7%QMBZFS
t
#BUUFSZDIBSHJOHDJSDVJU
t 1PXFSTVQQMZ
protection
t /FUXPSLJOH
t *OEVTUSJBMFRVJQNFOU
t 1$TFSWFS
t .FEJDBMFRVJQNFOU
t $PPMJOHGBOTZTUFN
t"VUPNPUJWF
t 4UPSBHFTZTUFN
Electrical Characteristics for Series
% 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%
0.02 sec., Min.; 0.1 sec., Max.
t 8JEFPQFSBUJOH
temperature range
t -PXUFNQFSBUVSF
de-rating
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
0.375
125
1.5130
0.088
x
0.500
0.500
125
0.7633
0.258
x
0.750
0.750
125
0.4080
0.847
x
1.00
001.
125
0.2516
1.76
x
x
1.50
01.5
125
50 amperes @125 VAC/
VDC
0.1186
4.70
x
x
2.00
002.
125
0.0708
6.76
x
x
2.50
02.5
125
PSE: 100 amperes
@100 VAC
0.0400
13.18
x
x
3.00
003.
125
0.0352
19.55
x
x
3.50
03.5
125
0.0261
32.70
x
x
4.00
004.
125
0.0227
40.80
x
x
5.00
005.
125
0.0171
59.59
x
x
Notes: - l2t calculated at 8ms. Resistance is measured at 10% of rated current, 25ºC
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/449.html for current information.
53
Revised: December 17, 2010
449 Series
449 Series
The lead free NANO2 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® design has enhanced inrush withstand
characteristics over the NANO2 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.
Mount
Fuses
IntroductionSurface
to Circuit
Protection
NANO2® > Slo-Blo®Transientology
> 449 Series
.750A
1A
1.5A
2A
2.5A
3A
3.5A
4A
5A
Average Time Current Curves
.375A
.500A
Temperature Rerating Curve
1000
TIME IN SECONDS
100
10
1
Note:
1. Derating depicted in this curve is in addition to the standard derating of 25% for
continuous operation.
0.1
0.01
0
1
10
100
CURRENT IN AMPERES
Soldering Parameters
Pre Heat
Pb – Free assembly
150°C
- Temperature Max (Ts(max))
200°C
- Time (Min to Max) (ts)
60 – 120 secs
3°C/second max.
TS(max) to TL - Ramp-up Rate
3°C/second max.
- Temperature (TL) (Liquidus)
217°C
- Temperature (tL)
60 – 90 seconds
250
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
Wave Soldering Parameters
¡$1FBL
Temperature,
3 seconds max.
449 Series
TL
TS(max)
tL
Ramp-down
TS(min)
Preheat
tS
25
Peak Temperature (TP)
+0/-5
Critical Zone
TL to TP
Ramp-up
- Temperature Min (Ts(min))
Average ramp up rate (Liquidus Temp
(TL) to peak
Reflow
tP
TP
Temperature
Reflow Condition
time to peak temperature
(t 25ºC to peak)
Time
°C
54
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/449.html for current information.
Surface Mount Fuses
NANO2® > Slo-Blo® > 449 Series
Product Characteristics
Body: Ceramic
Terminations:(PMEQMBUFE$BQT
Product Marking
Brand, Amperage Rating
Operating
Temperature
Moisture
Sensitivity Level
.*-45%.FUIPE5FTU
Condition B, 5 cycles, -65°C to
125°C, 15 minutes @ each extreme
.*-45%.FUIPE5FTU*
%FFOFSHJ[FE(TQLBNQMJUVEF
sawtooth wave 6ms duration, 3
DZDMFT9:;YZ[TIPDLT
.*-45%.FUIPE
BNQMJUVEF)[JONJOIST
FBDI9:;IST
Thermal Shock
Mechanical Shock
-55°C to 125°C
-FWFM+45%$
Vibration
Solderability
.*-45%.FUIPE
Insulation
Resistance (after
Opening)
.*-45%.FUIPE5FTU$POEJUJPO
A (10,000 ohms minimum)
Moisture Resistance
.*-45%.FUIPEDZDMFT
Salt Spray
.*-45%.FUIPE5FTU
Condition B (48hrs)
.*-45%.FUIPE5FTU
condition B (10 sec at 260°C)
Resistance to Soldering
Heat
Dimensions
Part Numbering System
6.86
(.270")
6.10
(.240")
3.15
(.124")
F
2.95
1.96 (.116")
(.077")
Recommended pad layout
0449 001. M R
SERIES
T
1A
1.45
(.057")
AMP Code*
Refer to Electrical characteristics table
2.69
(.106")
QUANTITY Code
.QDT
2.69
(.106")
PACKAGING Code
35BQFBOE3FFM
*Example:
0.375 Amp product is 0449.375MR
(1 amp product shown above).
Packaging
Packaging Option
Packaging Specification
Quantity
Quantity &
Packaging Code
12mm Tape and Reel
&*"34*&$QBSU
1000
MR
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/449.html for current information.
55
449 Series
449 Series
Materials
Introduction to Circuit Protection
Transientology
56
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.