Surface Mount Fuse Datasheet
437A Series
AEC-Q200 Qualified > 1206 Fast-Acting Ceramic Fuse
RoHS Pb
Description
The 437A Series AECQ-Compliant fuses are specifically tested to
cater to secondary circuit protection needs of compact auto-
electronics applications.
The general design ensures excellent temperature stability and
performance reliability. In addition to this, the high I²t values typical
of the Littelfuse Ceramic Fuse family ensure high inrush current
withstand capability.
Features & Benefits
■ OperatingTemperature from
■ AEC-Q200 Qualified
-55ºC to +150ºC
■ Recognized to UL/CSA/NMX
248-1 and UL/CSA/NMX 248-
14
■ 100% Lead-free, Halogen-Free
and RoHS compliant
■ Fast response to faulty
current to ensure over-current
protection for sensitive
electronic components
■ Conforms to EN/IEC 60127-1
and EN/IEC 60127-7
Additional Information
■ Conforms to the Low Voltage
Directive (LVD)
Applications
■ Li-ion Battery
■ LED Lighting
■ TFT Display
■ Battery Management System
(BMS)
Resources
Accessories
Samples
■ Automotive Navigation
System
■ Instruments Clusters
Agency Approvals
Agency
Agency File Number
Ampere Range
0.250A − 8.0A
0.250A − 8.0A
0.250A − 1.75A
0.500A − 8.0A
0.250A − 1.75A
Electrical Characteristics for Series
% of Ampere Rating
Ampere Rating
OpeningTime at 25ºC
E10480
29862
100%
0.250A − 8A
0.750A − 8A
4 hours, Minimum
N/A
250%
5 seconds, Maximum
1 second, Maximum
5 seconds, Maximum
J50519871
N/A
0.750A − 8A
350%
0.250A - 0.500A
Electrical Specifications by Item
Ampere
Rating
(A)
0.250 .250
0.375 .375
0.500 .500
Max.
Nominal
Nominal
NominalVoltage
Drop At Rated
Current (V) 4
0.78
Nominal Power
Dissipation At
Rated Current (W)
0.195
Agency Approvals
Amp
Code
Voltage
Rating (V)
125
Interrupting Rating 1
Resistance Melting I2t
(Ohms) 2
2.290
1.330
(A2Sec.) 3
0.003
0.010
x
x
x
x
x
x
x
x
x
-
-
x
x
x
x
50A @ 125VAC/DC
125
63
0.60
0.52
0.225
0.260
50A @ 63VAC/DC
50A @ 63VAC/DC
100A @ 63VDC
0.908
0.018
0.750 .750
63
0.600
0.064
0.45
0.338
x
x
x
x
x
1.00
1.25
1.50
1.75
2.00
2.50
3.00
3.50
4.00
5.00
7. 0 0
8.00
001.
1.25
01.5
1.75
002.
02.5
003.
03.5
004.
005.
0 0 7.
008.
63
63
63
63
63
63
63
63
63
63
35
35
0.420
0.318
0.209
0.071
0.062
0.043
0.035
0.027
0.022
0.0159
0.0100
0.008
0.100
0.256
0.324
0.075
0.144
0.441
0.506
0.777
1.024
2.30
0.41
0.40
0.39
0.27
0.20
0.15
0.14
0.13
0.13
0.13
0.13
0.13
0.410
0.500
0.585
0.473
0.400
0.375
0.420
0.455
0.520
0.650
0.910
1.040
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
x
x
x
x
x
x
x
x
x
x
-
-
-
-
-
50A @ 63VAC/DC
50A @ 45VAC/63VDC
50A @ 32VAC/35VDC
-
-
-
-
-
-
5.02
7.23
Notes:
4. Nominal Voltage Drop measured at rated current after temperature has stabilized.
Devices designed to carry rated current for 4 hours minimum. It is recommended that devices be operated
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.
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.
2. Nominal Resistance measured with < 10% rated current.
3. Nominal Melting I²t measured at 1 msec. opening time.
© 2023 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 06/14/23
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