37
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Surface Mount Fuses
468 Series
Thin Film > 1206 Size > Slo-Blo® > 468 Series
Please refer to www.littelfuse.com/series/468.html for current information.
468 Series
468 Series Fuse
Description
Agency Approvals
AGENCY AGENCY FILE NUMBER AMPERE RANGE
E10480 500MA - 3A
LR29862 500MA - 3A
Electrical Characteristics for Series
Features
• Complieswith
electronicindustry
environmentalstandards
forleadreduction.
• Productiscompatible
withlead-freesolders
andhighertemperature
proles.
• Timedelayfeature
withstandshighinrush
currentsandprevents
nuisanceopenings.
• Packageisvisually
distinctfromfast-
actingversionforeasy
identication.
• Topsidemarkingallows
visualvericationof
amperagerating.
% of Ampere
Rating Opening Time at 25OC
100% 4hours,Minimum
200% 1sec.,Min.;120sec.,Max.
300% 0.05sec.,Min.;1.5sec.,Max
800% 0.0015sec.,Min.;.05sec.,Max.
Applications
Ampere
Rating
(A)
Amp
Code
Max
Voltage
Rating
(V)
Interrupting
Rating
Nominal Cold
Resistance
(Ohms)
Nominal
Melting
I2t (A2sec)
Nom
Voltage
Drop
(mV)
Nom
Power
Dissipation
(W)
Agency
Approvals
0.50 .500 63
50amperes@63
VAC/VDC
0.27000 0.0310 156.77 0.0784 x x
1.00 001. 63 0.08250 0.1270 94.70 0.0947 x x
1.50 01.5 63 0.04750 0.2880 82.32 0.1235 x x
2.00 002. 63 35amperes@63VAC
50amperes@63
VDC
0.03240 0.5060 77.27 0.1545 x x
2.50 02.5 63 0.02240 1.0110 73.92 0.1848 x x
3.00 003. 32 50amperes@32
VAC/VDC
0.01950 1.2700 72.95 0.2189 x x
Electrical Specifications by Item
1. Measured at 10% of rated current, 25˚C.
2. Measured at rated voltage.
The468SeriesTime-Lag(Slo-Blo®)SMFisasmall(1206
size)thin-lmdevicedesignedforsecondaryprotection
ofcircuitsusedinspaceconstrainedapplicationssuchas
hand-heldportableelectronicdevices.
Thisseriesis100%lead-freeandmeetstherequirements
oftheRoHSdirective.NewHalogen-Free468Series
fusesareavailable–toorderusethe“HF”sufx.SeePart
Numberingsectionforadditionalinformation.
• Cellphones
• Batterypacks
• Digitalcameras
• DVDplayers
• Harddiskdrives.
Secondaryprotectionforspaceconstrainedapplications:
Revised: October 4, 2011
Introduction to Circuit Protection
Introduction to Circuit Protection
Transientology
38 © 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Surface Mount Fuses
468 Series
Thin Film > 1206 Size > Slo-Blo® > 468 Series
Please refer to www.littelfuse.com/series/468.html for current information.
Average Time Current Curves
0.001
0.01
0.1
1
10
100
0010110
Current in Amperes
Time in Seconds
3A
2A
2.5A
1A
1.5A
.5A
Temperature Rerating Curve
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–180secs
Average ramp up rate (Liquidus Temp
(TL) to peak 5°C/secondmax
TS(max) to TL - Ramp-up Rate 5°C/secondmax
Reflow - Temperature (TL) (Liquidus) 217°C
- Temperature (tL)60–150seconds
Peak Temperature (TP)250+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
Wave Soldering 260°C,10secondsmax.
Note:
1.Deratingdepictedinthiscurveisinadditiontothestandardderatingof25%for
continuousoperation.
Example:
Forcontinuousoperationat70degreescelsius,thefuseshouldbederatedasfollows:
I=(0.75)(0.80)IRAT=(0.60)IR AT
2.Thetemperaturederatingcurverepresentsthenominalconditions.Forquestions
abouttemperaturederatingcurve,pleaseconsultLittelfusetechnicalsupport
forassistance.
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
39
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Surface Mount Fuses
468 Series
Thin Film > 1206 Size > Slo-Blo® > 468 Series
Please refer to www.littelfuse.com/series/468.html for current information.
468 Series
Materials
Body:EpoxySubstrate
Terminations:100%TinoverNickelover
Copper
Element Cover Coat:ConformalCoating
Operating
Temperature
–55OCto90OC.Consulttemperature
reratingcurvechart.Foroperationabove
90°CpleasecontactLittelfuse
Thermal Shock Withstands5cyclesof–50OCto125OC
Humidity MIL-STD-202F,Method103B,ConditionD
Vibration
Withstands10-55HzperMIL-STD-
202F,Method201Aand
10-2000Hzat20G’sperMIL-STD-
202F,Method204D,ConditionD
Insulation Resistance
(After Opening) Greaterthan10,000ohms.
Resistance to
Soldering Heat
MIL-STD-202G,Method210F,
ConditionD
Product Characteristics
Dimensions Part Marking System
MARKING CODE VARIES
WITH AMPERAGE RATING
(SEE CHART)
.58
(.023")
Coating
.66
(.026")
2.03
(.080")
2.03
(.080")
WAVE SOLDER INFARED SOLDER
3.81
(.150")
1.52
(.060")
1.14
(.045")
4.83
(.190")
1.65
(.065")
1.52
(.060")
3.18
(.125")
1.52
(.060")
1.27
(.050")
Part Numbering System
Packaging
Packaging Option Packaging Specification Quantity Quantity &
Packaging Code
Tape&Reel–8mmtape EIA-481Rev.D(IEC60286,part3) 5000 NR
Amp
Code
Marking
Code
.500 TF
001. TH
01.5 TK
002. TN
02.5 TO
003. TP
0468002.NRHF
SERIES
AMP Code
‘HF’ SUFFIX
HALOGEN FREE ITEM
PACKAGING Code
ThedotispoisitionedbeforethePack-
agingSufxwithwholeratingsand
withinthenumberingsequencefor
fractionalratings.RefertoAmpCode
columnintheElectricalSpecications
table.
NR=TapeandReel,5000pcs
Example:
1.5ampproductis
046801.5NRHF(2amp
productshownabove).