Thin Film > 0603 Size > Very Fast Acting > 434 Series
Surface Mount Fuses
434 Series Fuse
Description
®
®
The 434 series fast-acting surface mount fuse series is
an ultra small (0603 size) thin-film device designed for
secondary protection of circuits used in space constrained
applications such as hand-held portable electronic devices.
For RoHS compliant and lead-free design, please refer to
the Littelfuse 467 series thin film fuse.
Features
fuse is an extremely
small, low profile design
(0603 chip size) utilizing
thin-film technology to
achieve precise control of
electrical characteristics.
Applications
Secondary protection for space constrained applications
such as:
produces a flat surface for
improved performance in
pick-and-place operations
and an alternate solution
for height critical
applications.
Agency Approvals
Agency
®
Agency File Number
Ampere Range
E10480
®
250mA - 3A
250mA - 3A
LR29862
Electrical Characteristics for Series
% of Ampere
Rating
100%
200%
300%
Opening Time at 25
O
C
4 hours, Minimum
5 seconds, Maximum.
0.2 seconds, Maximum
Electrical Specifications by Item
Ampere
Rating
(A)
0.250
0.375
0.500
0.680
0.750
1.00
1.25
1.50
1.75
2.00
2.50
3.00
3.50
4.00
5.00
Amp
Code
.250
.375
.500
.680
.750
001.
1.25
01.5
1.75
002.
02.5
003.
03.5
004.
005.
Max
Voltage
Rating
(V)
32
32
32
32
32
32
32
32
32
32
32
32
32
32
32
Interrupting
Rating
Nominal Cold
Resistance
(Ohms)
0.3750
0.2650
0.1903
0.1250
0.1140
0.0720
0.0540
0.0480
0.0390
0.0360
0.0280
0.0230
0.0190
0.0170
0.0130
Nominal
Melting
I
2
t (A
2
sec)
0.0030
0.0053
0.0087
0.0109
0.0171
0.0212
0.0320
0.0526
0.0661
0.1040
0.1750
0.1980
0.2650
0.3520
1.2970
Agency Approvals
®
®
50A @32 V AC/DC
35A @32 V AC/DC
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
1. Measured at 10% of rated current, 25ºC.
2. Measured at rated voltage.
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com for the most current information
31
Revision: February 13, 2008
434 Series
Thin Film > 0603 Size > Very Fast Acting > 434 Series
Surface Mount Fuses
Temperature Rerating Curve
Average Time Current Curves
100
10
TIME IN SECONDS
1
0.1
0.01
0.001
0.1
.25A
.375A
.5A
.68A
.75A
1A
1.5A
2A
2.5A
3A
3.5A
4A
5A
1
10
CURRENT IN AMPERES
100
Soldering Parameters - Wave Soldering
Reflow Condition
- Temperature Min (T
s(min)
)
Pre Heat
- Temperature Max (T
s(max)
)
- Time (Min to Max) (t
s
)
Average ramp up rate (Liquidus Temp
(T
L
) to peak
T
S(max)
to T
L
- Ramp-up Rate
Reflow
- Temperature (T
L
) (Liquidus)
- Temperature (t
L
)
Pb – Free assembly
150°C
200°C
60 – 180 secs
5°C/second max
5°C/second max
217°C
60 – 150 seconds
250
+0/-5
°C
20 – 40 seconds
5°C/second max
8 minutes Max.
260°C
Peak Temperature (T
P
)
Time within 5°C of actual peak
Temperature (t
p
)
Ramp-down Rate
Time 25°C to peak Temperature (T
P
)
Do not exceed
434 Series
32
Revision: February 13, 2008
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com for the most current information
Thin Film > 0603 Size > Very Fast Acting > 434 Series
Surface Mount Fuses
Product Characteristics
Materials
Operating
Temperature
Humidity
Body:
Epoxy Substrate
Terminations:
100% Tin over Nickel over Copper
Element Cover Coat:
Conformal Coating
– 55 C to 90 C. Consult temperature rerating
curve chart. For operation above 90°C contact
Littelfuse.
O
O
Thermal Shock
Vibration
Insulation Resistance
(After Opening)
Resistance to Soldering
Heat
Withstands 5 cycles of – 55
O
C to
125
O
C
Per MIL
-STD-202F
Greater than 10,000 ohms
Withstands 60 seconds above
200
O
C and up to 260
O
C, maximum
MIL
-STD-202F Method 103B Condition D
Dimensions
1.60
(.063")
.127
(.005")
Sn/Pb
Part Marking
Amp
Code
.250
.375
.279
(.011")
Coating
.254 (.010")
.305
(.012")
Marking
Code
D
E
F
X
G
H
J
K
L
N
O
P
R
S
T
.500
.680
.750
001.
1.25
01.5
1.75
002.
Cu
MARKING CODE VARIES
WITH AMPERAGE RATING
(SEE CHART)
Sn/Pb
Sn/Pb
.813
(.032")
1.09
(.043")
1.02
(.040")
3.20
(.126")
2.54
(.100")
1.02
(.040")
.762
(.030")
02.5
003.
03.5
004.
005.
1.09
(.043")
WAVE SOLDER
1.09
(.043")
REFLOW SOLDER
Part Numbering System
0434 1.75 NR
SERIES
AMP CODE
QUANTITY CODE
Packaging
Packaging Option
8mm Tape and Reel
Packaging Specification
EIA RS-481-2 (IEC 286, part 3)
Quantity
5000
Quantity &
Packaging Code
NR
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com for the most current information
33
Revision: February 13, 2008
434 Series
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