Thin Film > 1206 Size > Very Fast Acting > 433 Series
Surface Mount Fuses
433 Series Fuse
Description
®
®
The 433 series fast-acting surface mount fuse series
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.
For RoHS compliant and lead-free design, please refer to
the Littelfuse 466 series thin film fuse. For new designs of
7 amp please refer to Littelfuse 429 series thin film fuse.
Features
fuse is an extremely
small, low profile design
(1206 chip size) utilizing
thin-film technology to
achieve precise control of
electrical characteristics.
produces a flat surface for
Electrical Characteristics for Series
% of Ampere
Rating
100%
200%
300%
Opening Time at 25
O
C
4 hours, Minimum
5 sec., Maximum
0.2 sec., Maximum
Agency Approvals
Agency
®
Agency File Number
Ampere Range
improved performance in
pick-and-place operations
and an alternate solution
for height critical
application.
electrical specification are
identical to the popular
429 Series specifications.
E10480
®
125mA - 5A
125mA - 5A
LR29862
Applications
Secondary protection for space constrained applications
such as:
Electrical Specifications by Item
Ampere
Rating
(A)
0.125
0.200
0.250
0.375
0.50
0.60
0.75
0.80
1.00
1.25
1.50
1.75
2.00
2.50
3.00
4.00
5.00
Amp
Code
.125
.200
.250
.375
.500
.600
.750
.800
001.
1.25
01.5
1.75
02.0
02.5
03.0
04.0
05.0
Max
Voltage Rating
(V)
125
125
125
125
63
63
63
63
63
63
63
63
63
32
32
24
24
Interrupting
Rating
Nominal Cold
Resistance
(Ohms)
3.45000
0.93800
0.62500
0.37500
0.24050
0.21000
0.13700
0.12250
0.09950
0.07475
0.06250
0.05000
0.03975
0.03065
0.02625
0.01400
0.01100
Nominal
Melting
I
2
t (A
2
sec)
0.00040
0.00055
0.00100
0.00280
0.00600
0.01310
0.01700
0.03050
0.03500
0.06500
0.12500
0.15000
0.23000
0.50000
0.70000
1.0240
1.6000
Agency Approvals
®
®
50A @125 V AC/DC
50A @63 V AC/DC
50A @32 V AC/DC
50A @24 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
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
7
Revision: February 13, 2008
433 Series
Thin Film > 1206 Size > Very Fast Acting > 433 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
.125A
.200A
.25A
.375A
.5A
.6A
.75A
.8A
1A
1.25A
1.5A
1.75A
2A
2.5A
3A
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
433 Series
8
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 > 1206 Size > Very Fast Acting > 433 Series
Surface Mount Fuses
Product Characteristics
Body:
Epoxy Substrate
Terminations:
95% Tin / 5% Lead over Nickel
over Copper
Element Cover Coat:
Conformal Coating
– 55 C to 90 C. Consult temperature rerating
curve chart.
O
O
Humidity
Vibration
Insulation Resistance
(After Opening)
Resistance to
Soldering Heat
MIL
-STD-202F Method 103B
Condition D
Per MIL
-STD-202F Method 201A
,
Greater than 10,000 ohms.
Withstands 60 seconds above 200
O
C
and up to 260
O
C, maximum
Materials
Operating
Temperature
Thermal Shock
Withstands 5 cycles of – 55 C to 125 C
O
O
Dimensions
MARKING CODE VARIES
WITH AMPERAGE RATING
(SEE CHART)
Sn/Pb
Part Marking System
.66
(.026")
.58
(.023")
.56
(.022")
Sn/Pb
Sn/Pb
Coating
Amp
Code
.125
.200
.250
.375
.500
.600
.750
.800
001.
1.25
Marking
Code
B
C
D
E
F
.6
G
.8
H
J
K
L
N
O
P
R
S
T
3.18
(.125")
Cu
1.52
(.060")
3.18
(.125")
1.65
(.065")
1.52
(.060")
4.83
(.190")
1.27
(.050")
1.14
(.045")
3.81
(.150")
01.5
1.75
002.
02.5
003.
03.5
004.
005.
2.03
(.080")
WAVE SOLDER
2.03
(.080")
REFLOW SOLDER
Part Numbering System
0433 .125 NR
SERIES
AMP CODE
QUANTITY CODE
Packaging
Packaging Option
Tape & Reel – 8mm tape
Packaging Specification
EIA RS-481-1 (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
9
Revision: February 13, 2008
433 Series
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