Surface Mount Fuses
Thin Film > 1206 Size > Slo-Blo® > 468 Series
468 Series Fuse
Description
The 468 Series Time-Lag (Slo-Blo®) SMF is a small (1206
size) thin-film device designed for secondary protection
of circuits used in space constrained applications such as
hand-held portable electronic devices.
Features
Agency Approvals
AGENCY
AGENCY FILE NUMBER
AMPERE RANGE
E10480
500MA - 3A
LR29862
500MA - 3A
t $PNQMJFTXJUI
electronic industry
environmental standards
for lead reduction.
t 1BDLBHFJTWJTVBMMZ
distinct from fastacting version for easy
identification.
t 1SPEVDUJTDPNQBUJCMF
with lead-free solders
and higher temperature
profiles.
t 5PQTJEFNBSLJOHBMMPXT
visual verification of
amperage rating.
t 5JNFEFMBZGFBUVSF
withstands high inrush
currents and prevents
nuisance openings.
Electrical Characteristics for Series
% 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
Secondary protection for space constrained applications:
t $FMMQIPOFT
t %7%QMBZFST
t #BUUFSZQBDLT
t )BSEEJTLESJWFT
t %JHJUBMDBNFSBT
Electrical Specifications by Item
Ampere
Rating
(A)
Amp
Code
Max
Voltage
Rating
(V)
0.50
.500
63
1.00
001.
63
1.50
01.5
63
2.00
002.
63
2.50
02.5
63
3.00
003.
32
Interrupting
Rating
50 amperes @63
VAC/VDC
Agency
Approvals
Nominal
Melting
I2t (A2sec)
Nom
Voltage
Drop
(mV)
Nom
Power
Dissipation
(W)
0.27000
0.0310
156.77
0.0784
x
x
0.08250
0.1270
94.70
0.0947
x
x
Nominal Cold
Resistance
(Ohms)
0.04750
0.2880
82.32
0.1235
x
x
35 amperes @63 VAC
50 amperes @63
VDC
0.03240
0.5060
77.27
0.1545
x
x
0.02240
1.0110
73.92
0.1848
x
x
50 amperes @32
VAC/VDC
0.01950
1.2700
72.95
0.2189
x
x
1. Measured at 10% of rated current, 25ºC.
2. Measured at rated voltage.
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/468.html for current information.
37
Revised: January 7, 2009
468 Series
468 Series
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” suffix. See Part
Numbering section for additional information.
Mount
Fuses
IntroductionSurface
to Circuit
Protection
®
Thin Film > 1206 Size > Slo-BloTransientology
> 468 Series
2A
2.5A
3A
1A
100
1.5A
Average Time Current Curves
.5A
Temperature Rerating Curve
Time in Seconds
10
1
0.1
Note:
0.01
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)IRAT
0.001
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 – 180 secs
TL
TS(max)
5°C/second max
TS(max) to TL - Ramp-up Rate
5°C/second max
- Temperature (TL) (Liquidus)
217°C
- Temperature (tL)
60 – 150 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
468 Series
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
260°C, 10 seconds max.
38
Revised: January 7, 2009
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/468.html for current information.
Surface Mount Fuses
Thin Film > 1206 Size > Slo-Blo® > 468 Series
Product Characteristics
Materials
Body: Epoxy Substrate
Terminations: 100% Tin
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
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
Part Marking System
MARKING CODE VARIES
WITH AMPERAGE RATING
(SEE CHART)
.66
(.026")
.58
(.023")
1.27
(.050")
Coating
1.52
(.060")
Amp
Code
Marking
Code
.500
TF
001.
TH
01.5
TK
002.
TN
02.5
TO
003.
TP
468 Series
Dimensions
Vibration
Part Numbering System
3.18
(.125")
0468002.NRHF
1.65
(.065")
1.52
(.060")
SERIES
4.83
(.190")
2.03
(.080")
WAVE SOLDER
3.81
(.150")
1.52
(.060")
1.14
(.045")
AMP Code
The dot is poisitioned before the Packaging Suffix with whole ratings and
within the numbering sequence for
fractional ratings. Refer to Amp Code
column in the Electrical Specifications
table.
2.03
(.080")
INFARED SOLDER
PACKAGING Code
Example:
1.5 amp product is
046801.5NRHF (2 amp
product shown above).
NR = Tape and Reel, 5000 pcs
‘HF’ SUFFIX
HALOGEN FREE ITEM
Packaging
Packaging Option
Packaging Specification
Quantity
Quantity &
Packaging Code
Tape & Reel – 8mm tape
EIA RS-481-1 (IEC 286, part 3)
5000
NR
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/468.html for current information.
39
Revised: January 7, 2009
468 Series
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