Surface Mount Fuses
Ceramic Fuse > 438 Series
438 Series – 0603 Fast-Acting Fuse
Description
RoHS
Pb
The 438 Series is a 100% Lead-free, RoHS compliant and
Halogen-free fuse series designed specifically to provide
over-current protection to circuits that operate under high
working ambient temperature up to 150ºC.
The general design ensures excellent temperature stability
and performance reliability.
The high I²t values which is typical in the Littelfuse Ceramic
Fuse family ensure high inrush current withstand capability.
Features
Agency Approvals
AGENCY
AGENCY FILE NUMBER
E10480
29862
AMPERE RANGE
0.250A – 6A
0.250A – 6A
• Operating Temperature
from -55ºC to +150ºC
• 100% Lead-free, RoHS
compliant and Halogen-
free
Applications
• Handheld Electronics
• LCD Displays
• Battery Packs
Additional Information
• Suitable for both leaded
and lead-free reflow /
wave soldering
• Hard Disk Drives
• SD Memory Cards
Electrical Characteristics for Series
% of Ampere
Rating
100%
250%
Ampere Rating
0.250A – 6A
0.250A – 6A
Opening Time at 25ºC
4 Hours, Minimum
5 Seconds, Maximum
Datasheet
Resources
Samples
Electrical Specifications by Item
Ampere
Max.
Amp
Rating
Voltage
Code
(A)
Rating (V)
0.25
0.375
0.5
0.75
1
1.25
1.5
1.75
2
2.5
3
3.5
4
5
6
Notes:
1. AC Interrupting Rating tested at rated voltage with unity power factor. DC Interrupting
Rating tested at rated voltage with time constant < 0.8 msec.
2. Nominal Resistance measured with < 10% rated current.
3. Nominal Melting I²t measured at 1 msec. opening time.
4. Nominal Voltage Drop measured at rated current after temperature has stabilized.
© 2015 Littelfuse, Inc.
Specifications are testing to change without notice.
Specifications are subject to change without notice. Application subject is strongly recommended.
Revised: 05/25/15
Devices designed to carry rated current for 4 hours minimum. It is recommended that
devices be operated continuously at no more than 80% rated current. See “Temperature
Re-rating Curve”for additional re-rating information.
Devices designed to be mounted with marking code facing up.
Interrupting Rating
Nominal Nominal Voltage Nominal Power Agency Approvals
Nominal
Drop At Rated
Dissipation At
Resistance Melting I
2
t
(A
2
Sec.)
3
Current (V)
4
Rated Current (W)
(Ohms)
2
2.218
1.247
0.829
0.466
0.310
0.200
0.174
1.405
0.051
0.0324
0.0255
0.0205
0.0170
0.0115
0.0085
0.0017
0.0041
0.0100
0.0281
0.0593
0.0510
0.0902
0.1440
0.1490
0.1977
0.2922
0.4752
0.6920
0.7398
1.3838
0.550
0.488
0.486
0.378
0.351
0.365
0.368
0.360
0.107
0.095
0.093
0.082
0.079
0.074
0.072
0.138
0.183
0.243
0.284
0.351
0.456
0.552
0.540
0.214
0.238
0.279
0.287
0.316
0.370
0.432
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
.250
.375
.500
.750
001.
1.25
01.5
1.75
002.
02.5
003.
03.5
004.
005.
006.
63VDC
63VDC
63VDC
63VDC
63VDC
63VDC
63VDC
63VDC
32
32
32
32
32
32
24
50A @ 63VDC
50A @ 32VAC
50A @ 32VDC/12VAC
50A @ 24VDC/12VAC
Surface Mount Fuses
Ceramic Fuse > 438 Series
Temperature Re-rating Curve
140
Average Time Current Curves
.250A
.375A
.500A
.750A
1A
1.25A
1.5A
1.75A
2A
2.5A
3A
3.5A
4A
5A
6A
100
PERCENT OF RATING
120
100
10
80
TIME IN SECONDS
60
1
40
-65
-45
-25
-5
15
35
55
75
95
115
135
155
TEMPERATURE (°C)
0.1
Note:
1. Re-rating depicted in this curve is in addition to the standard re-rating of 20% for
continuous operation.
Example:
For continuous operation at 75 degrees celsius, the fuse should be rerated as follows:
I = (0.80)(0.85)I
RAT
= (0.68)I
RAT
0.01
0.001
0.1
1
10
100
CURRENT IN AMPERES
Soldering Parameters
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
60 – 180 seconds
3°C/second max.
5°C/second max.
217°C
60 – 150 seconds
260
+0/-5
°C
10 – 30 seconds
6°C/second max.
8 minutes max.
260°C
T
P
T
L
Temperature
t
P
Ramp-up
Critical Zone
T
L
to T
P
200°C
T
S(max)
T
S(min)
Preheat
t
L
Ramp-down
t
S
time to peak temperature
(t 25ºC to peak)
25
Time
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
Wave Soldering
260°C, 10 seconds max.
© 2015 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 05/25/15
Surface Mount Fuses
Ceramic Fuse > 438 Series
Product Characteristics
Body:
Advanced Ceramic
Terminations:
Ag / Ni / Sn (100% Lead-free)
Element Cover Coating:
Lead-free Glass
Moisture Resistance
Thermal Shock
Mechanical Shock
Vibration
Vibration,
High Frequency
Dissolution of
Metallization
Terminal Strength
MIL
-STD-202, Method 106
MIL
-STD-202, Method 107
,
Condition B-3
MIL
-STD-202, Method 213,
Condition A
MIL
-STD-202, Method 201
MIL
-STD-202, Method 204,
Condition D
IPC/EIC/JEDEC J-STD-002,
Condition D
IEC 60127-4
Materials
Moisture
IPC/JEDEC J-STD-020, Level 1
Sensitivity Level
Solderability
Humidity
Resistance to
Solder Heat
IPC/EIC/JEDEC J-STD-002, Condition B
MIL-STD-202, Method 103, Conditions D
MIL-STD-202, Method 210, Condition B
Dimensions
0.530 +/- 0.150
[0.021 +/- 0.006]
1.54 ± 0.150
[0.061 ± 0.006]
Part Marking System
Amp Code
.250
.375
.500
.750
001.
1.25
01.5
Marking Code
D
E
F
G
H
J
K
L
N
O
P
R
S
T
U
0.85 ± 0.150
[0.033 ± 0.006]
0.502 ± 0.080
[0.020 ± 0.003]
1.75
002.
02.5
003.
03.5
004.
005.
006.
0.432 +/- 0.150
[0.017 +/- 0.006]
0.60
[0.024]
0.74
[0.029]
Part Numbering System
0438 005. W R
SERIES
PACKING CODE
AMP CODE
R = Reel Pack
1.00
[0.039]
1.94
[0.076]
QUANTITY CODE
W = 3000 pcs
Packaging
Packaging Option
8mm Tape and Reel
Packaging Specification
EIA-481, IEC 60286, Part 3
Quantity
3000
Quantity &
Packaging Code
WR
© 2015 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 05/25/15
Analogue and Mixed Signal
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