49
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Surface Mount Fuses
448 Series
NANO2® > Very Fast-Acting > 448 Series
Please refer to www.littelfuse.com/series/448.html for current information.
448 Series
448 Series Fuse
Description
The lead-free Nano2 SMF Fuse is a very small, square
surface mount fuse that 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.
Agency Approvals
Features
PS
E
Electrical Characteristics for Series
% of Ampere
Rating Ampere Rating Opening Time
100% 1/16 –15 4 hours, Minimum
200%
1/16 –10 5 sec., Maximum
12 –15 20 sec., Maximum
Applications
UÊ ÌiLÊ*
UÊ É**Ê/6Ê
UÊ ÊÌÀ
UÊ É**Ê«>i
UÊ ÊL>V}ÌÊÛiÀÌiÀ
UÊ *ÀÌ>LiÊ6Ê«>ÞiÀ
UÊ *ÜiÀÊÃÕ««Þ
UÊ iÌÜÀ}Ê
UÊ *ÊÃiÀÛiÀ
UÊ }Êv>ÊÃÞÃÌi
UÊ -ÌÀ>}iÊÃÞÃÌi
UÊ /iiVÊÃÞÃÌi
UÊ 7ÀiiÃÃÊL>ÃiÃÌ>Ì
UÊ 7ÌiÊ}`Ã
UÊ >iÊVÃi
UÊ "vwViÊÕÌ>ÌÊ
equipment
UÊ >ÌÌiÀÞÊV>À}}ÊVÀVÕÌÊ
protection
UÊ `ÕÃÌÀ>ÊiµÕ«iÌ
UÊ i`V>ÊiµÕ«iÌ
UÊÊÕÌÌÛi
UÊ i>`vÀiiÊ>`Ê>}iÊ
Free
UÊ 6iÀÞÊv>ÃÌÊ>VÌ}
UÊ ->ÊÃâiÊ
UÊ 7`iÊÀ>}iÊvÊVÕÀÀiÌÊ
À>Ì}Ê>Û>>LiÊÈÓÊ
ÌÊ£x®
UÊ 7`iÊ«iÀ>Ì}Ê
temperature range
UÊ ÜÊÌi«iÀ>ÌÕÀiÊ
de-rating
AGENCY AGENCY FILE NUMBER AMPERE RANGE
E10480 62mA - 15A
LR29862 62mA - 15A
PS
ENBK030205 1A - 10A
Revised: October 7, 2011
Introduction to Circuit Protection
Introduction to Circuit Protection
Transientology
50 © 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Surface Mount Fuses
448 Series
NANO2® > Very Fast-Acting > 448 Series
Please refer to www.littelfuse.com/series/448.html for current information.
Ampere
Rating
(A)
Amp Code
Max
Voltage
Rating
(V)
Interrupting
Rating
Nominal Cold
Resistance
(Ohms)
Nominal
Melting
I2t (A2sec)
Agency Approvals
PS
E
0.062 .062 125
50 amperes
J£ÓxÊ6É6
300 amperes
JÎÓÊ6
*-\Ê£ääÊ>«iÀiÃ
J£ää6
5.50 0.00023 x x
0.080 .080 125 4.42 0.00043 x x
0.100 .100 125 2.90 0.00082 x x
0.125 .125 125 2.58 0.00130 x x
0.160 .160 125 1.76 0.00280 x x
0.200 .200 125 1.40 0.00380 x x
0.250 .250 125 1.05 0.01520 x x
0.315 .315 125 0.7900 0.02650 x x
0.375 .375 125 0.7300 0.02400 x x
0.400 .400 125 0.4895 0.04160 x x
0.500 .500 125 0.3800 0.10000 x x
0.630 .630 125 0.2821 0.121 x x
0.750 .750 125 0.2475 0.206 x x
0.800 .800 125 0.1907 0.272 x x
1.00 001. 125 0.08630 0.441 x x x
1.25 1.25 125 0.06619 0.900 x x x
1.50 01.5 125 0.06514 0.900 x x x
1.60 01.6 125 0.06261 1.122 x x x
2.00 002. 125 0.03529 0.812 x x x
2.50 02.5 125 0.02934 1.156 x x x
3.00 003. 125 0.02445 1.720 x x x
3.15 3.15 125 0.02300 1.810 x x x
3.50 03.5 125 0.02100 2.300 x x x
4.00 004. 125 0.01577 3.970 x x x
5.00 005. 125 0.01531 4.490 x x x
6.30 06.3 125 0.01044 12.10 x x x
7.00 007. 125 0.00900 13.92 x x x
8.00 008. 125 0.00780 18.33 x x x
10.00 010. 125
35 amperes
J£ÓxÊ6
50 amperes
J£ÓxÊ6
300 amperes
JÎÓÊ6
*-\Ê£ääÊ>«iÀiÃ
J£ää6
0.00700 28.00 x x x
12.00 012. 65 50 amperes
JÈxÊ6É6
300 amperes
JÓ{Ê6
0.00533 47.59 x x
15.00 015. 65 0.00394 96.10 x x
Electrical Specifications by Item
Notes:
- l2t calculated at 8ms.
- Resistance is measured at 10% of rated current, 25ºC
51
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Surface Mount Fuses
448 Series
NANO2® > Very Fast-Acting > 448 Series
Please refer to www.littelfuse.com/series/448.html for current information.
448 Series
Average Time Current Curves
Reflow Condition *LÊqÊÀiiÊ>ÃÃiLÞ
Pre Heat
- Temperature Min (Ts(min))£xäcÊ
- Temperature Max (Ts(max))Óääc
- Time (Min to Max) (ts)60 – 120 secs
Average ramp up rate (Liquidus Temp
(TL) to peak xcÉÃiV`Ê>Ý°
TS(max) to TL - Ramp-up Rate xcÉÃiV`Ê>Ý°
Reflow - Temperature (TL) (Liquidus) Ó£ÇcÊ
- Temperature (tL)60 – 90 seconds
Peak Temperature (TP)250+0/-5Êc
Time within 5°C of actual peak
Temperature (tp)20 – 40 seconds
Ramp-down Rate xcÉÃiV`Ê>Ý°
Time 25°C to peak Temperature (TP)8 minutes max.
Do not exceed ÓÈäc
Wave Soldering Parameters
ÓÈäcÊ*i>Ê
Temperature, 10
seconds max.
Soldering Parameters
Temperature Rerating Curve
0.001
0.01
0.1
1
10
100
00010010111.0
CURRENT IN AMPS
TIME IN SECONDS
.062 A
.080 A
.100 A
.125 A
.160 A
.200 A
.250 A
.315 A
.375 A
.40 A
.50 A
.63 A
.75 A
.80 A
1.00 A
1.25 A
1.50 A
1.60 A
2.00 A
2.50 A
3.00 A
3.15 A
3.50 A
4.00 A
5.00 A
6.30 A
7 A
8 A
10 A
12 A
15 A
Ìi\
£°ÊiÀ>Ì}Ê`i«VÌi`ÊÊÌÃÊVÕÀÛiÊÃÊÊ>``ÌÊÌÊÌiÊÃÌ>`>À`Ê`iÀ>Ì}ÊvÊÓx¯ÊvÀÊ
continuous operation.
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
Introduction to Circuit Protection
Introduction to Circuit Protection
Transientology
52 © 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Surface Mount Fuses
448 Series
NANO2® > Very Fast-Acting > 448 Series
Please refer to www.littelfuse.com/series/448.html for current information.
Materials `Þ\ÊÊiÀ>VÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊ
/iÀ>ÌÃ\ÊÊ`«>Ìi`Ê>«Ã
Product Marking À>`]Ê«iÀ>}iÊ,>Ì}
Operating
Temperature -55oÊÌÊ£Óxo
Moisture Sensitivity
Level iÛiÊ£]Ê-/äÓä
Solderability -/ÓäÓ]ÊiÌ`ÊÓän
Insulation
Resistance (after
Opening)
-/ÓäÓ]ÊiÌ`ÊÎäÓ]Ê/iÃÌÊ
`ÌÊÊ£ä]äääÊÃÊÕ®
Thermal Shock
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`ÌÊ]ÊxÊVÞViÃ]ÊÈxoÊÌÊ
125o]Ê£xÊÕÌiÃÊJÊi>VÊiÝÌÀii
Mechanical Shock
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iiiÀ}âi`°ÊÊ£ää½ÃÊ«Ê>«ÌÕ`i]Ê
sawtooth wave 6ms duration, 3
VÞViÃÊ89<³ÝÞâÊrÊ£nÊÃVÃ
Vibration
-/ÓäÓ]ÊiÌ`ÊÓä£\Êä°äλÊ
>«ÌÕ`i]Ê£äxxÊâÊÊ£Ê°ÊÊÓÀÃÊ
i>VÊ89<rÈÀÃ
Moisture Resistance -/ÓäÓ]ÊiÌ`Ê£äÈ]Ê£äÊ
cycles
Salt Spray -/ÓäÓ]ÊiÌ`Ê£ä£]Ê/iÃÌÊ
`ÌÊÊ{nÀî
Resistance to Soldering
Heat
-/ÓäÓ]ÊiÌ`ÊÓ£ä]Ê/iÃÌÊ
V`ÌÊÊ£äÊÃiVÊ>ÌÊÓÈäo®
Product Characteristics
F
7 A
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
Dimensions
Packaging
Part Numbering System
Packaging Option Packaging Specification Quantity Quantity &
Packaging Code
12mm Tape and Reel Ê,-{n££ÊÊÓnÈ]Ê«>ÀÌÊή 1000 MR
0448 001. M R
SERIES
AMP Code*
QUANTITY Code
PACKAGING Code
Refer to Electrical
Characteristics table
M = 1000 pcs
R = Tape and Reel
*Example:
1.5 amp product is 044801.5MR
£Ê>«Ê«À`ÕVÌÊÃÜÊ>LÛi®°