Surface Mount Fuses
Ceramic Fuse > 438A Series
438A Series – 0603 Fast-Acting Fuse
Description
RoHS
Pb
The 438A series AECQ-compliant fuses are specifically
tested to cater secondary circuit protection needs of
compact auto electronics application.
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
• Operating Temperature
from -55ºC to +150ºC
AMPERE RANGE
0.250A – 6A
0.250A – 6A
Agency Approvals
AGENCY
AGENCY FILE NUMBER
E10480
29862
• 100% Lead-free, RoHS
compliant and Halogen-
free
• Suitable for both leaded
and lead-free reflow/wave
soldering
• Meets Littelfuse's
Automotive qualifications*
* Largely based on Littelfuse internal AECQ-200 test plan.
Applications
• Li-ion Battery
• TFT Display
• Battery Management
System (BMS)
• Clusters
• LED Head-Lights
• Automotive Navigation
System
Additional Information
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
1.75
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.
© 2017 Littelfuse, Inc.
Specifications are testing to change without notice.
Specifications are subject to change without notice. Application subject is strongly recommended.
Revised: 12/06/17
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
(AC/DC)
1
Nominal
Nominal Nominal Voltage Nominal Power
Resistance Melting I
2
t
Drop At Rated
Dissipation At
(Ohms)
2
(A
2
Sec.)
3
Current (V)
4
Rated Current (W)
2.218
1.247
0.829
0.466
0.310
0.200
1.405
0.0490
0.0364
0.0264
0.0210
0.0177
0.0127
0.0086
0.0017
0.0041
0.0100
0.0281
0.0593
0.0510
0.1440
0.181
0.240
0.439
0.647
0.730
0.747
1.444
0.550
0.488
0.486
0.378
0.351
0.365
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
0.540
0.214
0.238
0.279
0.287
0.316
0.370
0.432
Agency Approvals
.250
.375
.500
.750
001.
1.25
1.75
002.
02.5
003.
03.5
004.
005.
006.
63VDC
63VDC
63VDC
63VDC
63VDC
63VDC
32VDC
32
32
32
32
32
32
24
50A @ 63VDC
50A @ 32VAC
50A@32VAC/32VDC
50A @ 32VDC/12VAC
50A @ 24VDC/12VAC
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
Surface Mount Fuses
Ceramic Fuse > 438A Series
Temperature Re-rating Curve
140
Average Time Current Curves
.250A
.375A
.500A
.750A
1A
1.25A
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
1.75A
2A
2.5A
3A
3.5A
4A
5A
6A
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.
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/06/17
Surface Mount Fuses
Ceramic Fuse > 438A Series
Product Characteristics
Materials
Moisture
Sensitivity Level
Solderability
Humidity Test
Resistance to
Solder Heat
Moisture
Resistance
Thermal Shock
Mechanical
Shock
Vibration
Vibration,
High Frequency
Dissolution of
Metallization
Terminal
Strength
Body:
Advanced Ceramic
Terminations:
Ag/Ni/Sn (100% Lead-free)
Element Cover Coating:
Lead-free Glass
IPC/JEDEC J-STD-020, Level 1
IPC/EIC/JEDEC J-STD-002, Condition C
MIL-STD-202, Method 103, Conditions D
MIL-STD-202, Method 210, Condition B
MIL-STD-202, Method 106
MIL
-STD-202, Method 107
,
Condition B
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
High Temperature
MIL
-STD-202 Method 108 with exemptions
Storage
Thermal Shock
Test
Biased Humidity
Operational Life
Resistance To
Solvents
Mechanical
Shock
High Frequency
Vibration
Resistance To
Soldering Heat
Solderability
Terminal
Strength For
SMD
Board Flex
Electrical
Characterization
JESD22 Method JA-104,
Test Conditions B and N
MIL
-STD-202 Method 103, 85°C/85% RH
with 10% operating power for 1000 hrs
MIL
-STD-202 Method 108, Test Condition D
MIL
-STD-202 Method 215
MIL
-STD-202 Method 213, Test Condition C
MIL
-STD-202, Method 204
MIL
-STD-202 Method 210, Test Condition B
JESD22-B102E Method 1
AEC Q200-006
AEC Q200-005
3 Temperature Electrical Characterization
Dimensions
1.575±0.152
[0.062 ± 0.006]
Part Marking System
Amp Code
.250
.375
.500
.750
001.
0.530 +/- 0.150
[0.021 +/- 0.006]
Marking Code
D
E
F
G
H
J
L
N
O
P
R
S
T
U
0.85 ± 0.150
[0.033 ± 0.006]
1.25
1.75
002.
02.5
003.
03.5
004.
005.
006.
0.508±0.102
[0.02±0.004]
0.432 +/- 0.150
[0.017 +/- 0.006]
Part Numbering System
0.60
[0.024]
0.74
[0.029]
0438 005. W R
SERIES
A
AEC-Q200 QUALIFIED
PACKING CODE
R = Reel Pack
1.00
[0.039]
AMP CODE
1.94
[0.076]
QUANTITY CODE
W = 3000 pcs
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/06/17
Surface Mount Fuses
Ceramic Fuse > 438A Series
Packaging
Packaging Option
8mm Tape and Reel
Packaging Specification
EIA-481, IEC 60286, Part 3
Quantity
3000
Quantity & Packaging Code
WR
Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the
suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and may not be used
in, all applications. Read complete Disclaimer Notice at
www.littelfuse.com/disclaimer-electronics.
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/06/17
Mouser Electronics
Authorized Distributor
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