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© 2009 Littelfuse, Inc.
Specications are subject to change without notice.
Surface Mount Fuses
Please refer to www.littelfuse.com/series/440.html for current information.
440 Series
Ceramic Fuse > 440 Series
440 Series
440 Series, 1206 High I2t Fuse
Description
The 440 Series is a 100% Lead-free, RoHS compliant and
Halogen-free fuse series designed specically to provide
over-current protection to circuits that operate under high
working ambient temperatures up to 150ºC and high inrush
currents.
The general design ensures excellent temperature stability
and performance reliability.
This high I2t fuse series is designed to have ultra high
inrush current withstand capability to avoid nuisance fuse
open.
Agency Approvals
AGENCY AGENCY FILE NUMBER AMPERE RANGE
E10480 .25A - 8A
LR 29862 .25A - 8A
Features
Electrical Characteristics for Series
• OperatingTemperature
from -55ºC to +150ºC
• 100%Lead-free,RoHS
compliant and Halogen-
free
• Suitableforbothleaded
and lead-free reow /
wave soldering
• UltrahighI2t values
% of Ampere
Rating Ampere Rating Opening Time at 25ºC
100% 0.25A - 8A 4 hours, Minimum
350% 0.25A - 8A 5 secs., Maximum
Applications
Ampere
Rating
(A)
Amp
Code
Max.
Voltage
Rating (V)
Interrupting Rating
(AC/DC)1
Nominal
Resistance
(Ohms)2
Nominal
Melting I2t
(A2Sec.)3
Nominal Voltage
Drop At Rated
Current (V)4
Nominal Power
Dissipation At
Rated Current (W)
Agency Approvals
0.25 .250 125 50 A @ 125 V AC/DC 2.140 0.00649 0.5260 0.132 x X
0.375 .375 125 1.216 0.01455 0.4993 0.187 x X
0.5 .500 63 50 A @ 63 V AC/DC 0.8140 0.02642 0.4831 0.242 x X
0.75 .750 63 50 A @ 63 V AC/DC 0.4624 0.09312 0.3983 0.299 x X
10 01. 50 50 A @ 50 V DC
50 A @ 50 V AC
0.3096 0.21054 0.3457 0.346 x X
1.25 1.25 50 0.2268 0.40200 0.3240 0.405 x X
1.5 01.5 50 0.1759 0.50652 0.3215 0.482 x X
1.75 1.75 32
50 A @ 32 V AC/DC
0.04518 0.3312 0.0777 0.136 x X
2 002. 32 0.03802 0.4326 0.0792 0.158 x X
2.5 02.5 32 0.02850 0.8191 0.0747 0.187 x X
3 003. 32 0.02252 1.232 0.0742 0.223 x X
3.5 03.5 32 0.01845 1.789 0.0757 0.265 x X
4 004. 32 0.01553 2.601 0.0709 0.284 x X
5 005. 32 0.01164 4.761 0.0654 0.327 x X
7 007. 32 0.00753 8.464 0.0696 0.487 x X
8 008. 32 0.00634 12.95 0.0655 0.524 x X
Electrical Specications by Item
Notes:
1. AC Interrupting Rating tested at rated voltage with unity power factor. DC Interrupting
Rating tested at rated voltage with time constant < 0.8 msec.
2. Nominal Resistance measured with < 10% rated current.
3. Nominal Melting I²t measured at 1 msec. opening time.
4. Nominal Voltage Drop measured at rated current after temperature has stabilized.
• AutomotiveElectronics
• LCDDisplays
• Servers
• NotebookComputers
• Printers
• Scanners
• DataModems
• HardDiskDrives
Devices designed to carry rated current for 4 hours minimum. It is recommended that
devices be operated continuously at no more than 80% rated current. See “Temperature
Derating Curve”for additional derating information.
Devices designed to be mounted with marking code facing up.
Revised: June 23, 2011
Introduction to Circuit Protection
Introduction to Circuit Protection
Transientology
2© 2009 Littelfuse, Inc.
Specications are subject to change without notice.
Surface Mount Fuses
Please refer to www.littelfuse.com/series/440.html for current information.
440 Series
Ceramic Fuse > 440 Series
Average Time Current Curves
0.001
0.1 1.0 10.0 100.0 1000.
0.01
0.1
1
10
100
TIME IN SECONDS
CURRENT IN AMPERES
Reow Condition Pb-freeassembly
Pre Heat
- Temperature Min (Ts(min))150°C
- Temperature Max (Ts(max))200°C
- Time (Min to Max) (ts)60 – 180 seconds
Average Ramp-Up Rate (Liquidus Temp
(TL) to peak) 3°C/second max.
TS(max) to TL - Ramp-up Rate 5°C/second max.
Reow - Temperature (TL) (Liquidus) 217°C
- Temperature (tL)60 – 150 seconds
Peak Temperature (TP)260+0/-5 °C
Time within 5°C of actual peak
Temperature (tp)10 – 30 seconds
Ramp-down Rate 6°C/second max.
Time 25°C to peak Temperature (TP)8 minutes max.
Do not exceed 260°C
Soldering Parameters
Temperature Derating Curve
40
60
80
100
120
140
-65 -45 -25 -5 15 35 55 75 95 115 135 15 5
TEMPERATURE (°C)
PERCENT OF RATING
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
Example:
For continuous operation at 75 degrees celsius, the fuse should be derated as follows:
I = (0.80)(0.85)IRAT = (0.68)IRAT
Note:
1. Derating depicted in this curve is in addition to the standard derating of 20% for
continuous operation.
Wave Soldering 260°C, 10 seconds max.
3
© 2009 Littelfuse, Inc.
Specications are subject to change without notice.
Surface Mount Fuses
Please refer to www.littelfuse.com/series/440.html for current information.
440 Series
Ceramic Fuse > 440 Series
440 Series
Materials
Body: Advanced Ceramic
Terminations: Ag / Ni / Sn (100% Lead-free)
Element Cover Coating: Lead-free Glass
Moisture
Sensitivity Level IPC/JEDECJ-STD-020C,Level1
Solderability IPC/ECA/JEDECJ-STD-002B,ConditionC
Humidity Test MIL-STD-202,Method103B,ConditionsD
Resistance to
Solder Heat MIL-STD-202,Method210F,ConditionB
Product Characteristics
Moisture Resistance MIL-STD-202, Method 106G
Thermal Shock MIL-STD-202, Method 107G,
ConditionB
Mechanical Shock MIL-STD-202,Method213B,
Condition A
Vibration MIL-STD-202, Method 201A
Vibration,
High Frequency
MIL-STD-202, Method 204D,
Condition D
Dissolution of
Metallization
IPC/ECA/JEDECJ-STD-002C,
Condition D
Terminal Strength IEC60127-4
Dimensions
3.200 ± .1778
[.126 ± .007]
1.000
[.039]
X
1.500
[.059]
1.800
[.071]
3.500
[.138]
1.000
[.039]
.8179 +.046/ -.076
[.0322 +.0018/ -.003]
0.520 ± .200
[.020 ± .008]
TERMINATION
1.63 + .10/ -.20
[.064 + .004/ -.008]
Packaging
Part Marking System
Packaging Option Packaging Specication Quantity Quantity &
Packaging Code
8mm Tape and Reel EIA-481,IEC60286,Part3 3000 WR
Part Numbering System
0440 008. W R
SERIES
AMP CODE
QUANTITY CODE
W = 3000 pcs
PACKING CODE
R=ReelPack
Amp Code Marking Code
.250 D
.375 E
.500 F
.750 G
0 01. H
1.25 J
01.5 K
1.75 L
002. N
02.5 O
003. P
03.5 R
004. S
005. T
007. W
008. X