Page 1
Surface Mount Fuses
®
®
®
Thin Film > 0603 Size > Very Fast Acting > 434 Series
434 Series Fuse
Agency Approvals
Agency Agency File Number Ampere Range
®
Electrical Characteristics for Series
% of Ampere
E10480 250mA - 3A
LR29862 250mA - 3A
®
Rating
100% 4 hours, Minimum
200% 5 seconds, Maximum.
300% 0.2 seconds, Maximum
Opening Time at 25
®
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
t 5IF4MJN-JOF
fuse is an extremely
small, low profile design
(0603 chip size) utilizing
thin-film technology to
achieve precise control of
electrical characteristics.
t 5IFMPXFSIFJHIUQSPmMF
produces a flat surface for
improved performance in
pick-and-place operations
and an alternate solution
for height critical
applications.
Applications
Secondary protection for space constrained applications
such as:
t $FMMQIPOFT
O
C
t #BUUFSZQBDLT
t %7%QMBZFST
t )BSEEJTLESJWFT
t %JHJUBMDBNFSBT
Electrical Specifications by Item
Ampere
Rating
(A)
0.250 .250 32
0.375 .375 32 0.2650 0.0053 x x
0.500 .500 32 0.1903 0.0087 x x
0.680 .680 32 0.1250 0.0109 x x
0.750 .750 32 0.1140 0.0171 x x
1.00 001. 32 0.0720 0.0212 x x
1.25 1.25 32
1.50 01.5 32 0.0480 0.0526 x x
1.75 1.75 32 0.0390 0.0661 x x
2.00 002. 32 0.0360 0.1040 x x
2.50 02.5 32 0.0280 0.1750 x x
3.00 003. 32 0.0230 0.1980 x x
3.50 03.5 32 0.0190 0.2650 x x
4.00 004. 32 0.0170 0.3520 x x
5.00 005. 32 0.0130 1.2970 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
Amp
Code
Max
Voltage
Rating
(V)
Interrupting
Rating
50A @32 V AC/DC
35A @32 V AC/DC
Nominal Cold
Resistance
(Ohms)
0.3750 0.0030 x x
0.0540 0.0320 x x
31
Revision: February 13, 2008
Nominal
Melting
2
t (A2sec)
I
Agency Approvals
434 Series
Page 2
Surface Mount Fuses
Thin Film > 0603 Size > Very Fast Acting > 434 Series
Temperature Rerating Curve
Average Time Current Curves
1A
.75A
.5A
.375A
.25A
100
10
1
TIME IN SECONDS
0.1
0.01
0.001
0.1
.68A
1
CURRENT IN AMPERES
1.5A
3A
2.5A
2A
3.5A4A5A
10 100
Soldering Parameters - Wave Soldering
Reflow Condition Pb – Free assembly
- Temperature Min (T
Pre Heat
- Temperature Max (T
- Time (Min to Max) (ts) 60 – 180 secs
Average ramp up rate (Liquidus Temp
(T
) to peak
L
to TL - Ramp-up Rate 5°C/second max
T
S(max)
Reflow
- Temperature (T
- Temperature (tL) 60 – 150 seconds
L
Peak Temperature (TP) 250
Time within 5°C of actual peak
Temperature (t
)
p
Ramp-down Rate 5°C/second max
Time 25°C to peak Temperature (T
Do not exceed 260°C
) 150°C
s(min)
) 200°C
s(max)
5°C/second max
) (Liquidus) 217°C
+0/-5
20 – 40 seconds
) 8 minutes Max.
P
°C
434 Series
32
Revision: February 13, 2008
©2008 Littelfuse, Inc.
Please refer to www.littelfuse.com for the most current information
Specifications are subject to change without notice.
Page 3
Surface Mount Fuses
Thin Film > 0603 Size > Very Fast Acting > 434 Series
Product Characteristics
Body: Epoxy Substrate
Materials
Operating
Temperature
Humidity MIL-STD-202F Method 103B Condition D
Terminations: 100% Tin over Nickel over Copper
Element Cover Coat: Conformal Coating
O
– 55
C to 90OC. Consult temperature rerating
curve chart. For operation above 90°C contact
Littelfuse.
Thermal Shock
Withstands 5 cycles of – 55
125OC
Vibration Per MIL-STD-202F
Insulation Resistance
(After Opening)
Resistance to Soldering
Heat
Greater than 10,000 ohms
Withstands 60 seconds above
O
200
C and up to 260OC, maximum
O
C to
Dimensions
MARKING CODE VARIES
WITH AMPERAGE RATING
(SEE CHART)
Cu
.813
(.032")
1.09
(.043")
1.02
(.040")
WAVE SOLDER
1.60
(.063")
.127
(.005")
1.09
(.043")
Sn/Pb
3.20
(.126")
Sn/Pb
Sn/Pb
.254 (.010")
1.09
(.043")
Coating
.279
(.011")
2.54
(.100")
REFLOW SOLDER
.305
(.012")
1.02
(.040")
.762
(.030")
Part Marking
Amp
Code
.250 D
.375 E
.500 F
.680 X
.750 G
001. H
1.25 J
01.5 K
1.75 L
002. N
02.5 O
003. P
03.5 R
004. S
005. T
Marking
Code
Part Numbering System
0434 1.75 NR
SERIES
AMP CODE
Packaging
Packaging Option Packaging Specification Quantity
8mm Tape and Reel EIA RS-481-2 (IEC 286, part 3) 5000 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
QUANTITY CODE
Quantity &
Packaging Code
434 Series
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