437A Series Datasheet by Littelfuse Inc.

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© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 02/07/19
Ceramic Fuse > 437A Series
Surface Mount Fuses
437A Series – 1206 Fast-Acting Ceramic Fuse
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.
Agency Approvals
Agency Agency File Number Ampere Range
E10480 0.500A − 8A
29862 0.500A − 8A
Features
Electrical Characteristics for Series
Operating Temperature
from -55ºC to +150ºC
100% Lead-free, Halogen-
Free and RoHS compliant
Meets Littelfuse’s
automotive qualifications*
Fast response to faulty
current to ensure over-
current protection for
sensitive electronic
components
% of Ampere
Rating Ampere Rating Opening Time at 25ºC
100% 0.500A − 8A 4 hours, Minimum
250% 0.750A − 8A 5 seconds, Maximum
350%
0.750A − 8A 1 second, Maximum
0.500A 5 seconds, Maximum
Applications
Ampere
Rating
(A)
Amp
Code
Max.
Voltage
Rating
(V)
Interrupting Rating 1
Nominal
Resistance
(Ohms) 2
Nominal
Melting I2t
(A2Sec.) 3
Nominal Voltage
Drop At Rated
Current (V) 4
Nominal Power
Dissipation At Rated
Current (W)
Agency
Approvals
0.500 .500 63 50A @ 63VAC/DC 0.908 0.018 0.52 0.260 x x
0.750 .750 63
50A @ 63VAC/DC
100A @ 63VDC
0.600 0.064 0.45 0.338 x x
1. 0 0 0 01. 63
50A @ 63VAC/DC
0.420 0.100 0.41 0.410 x x
1.25 1.25 63 0.318 0.256 0.40 0.500 x x
1.50 01.5 63 0.209 0.324 0.39 0.585 x x
1.75 1.75 63 0.071 0.075 0.27 0.473 x x
2.00 002. 63 0.062 0.144 0.20 0.400 x x
2.50 02.5 32
50A @ 32VAC/35VDC
0.043 0.441 0.15 0.375 x x
3.00 003. 32 0.035 0.506 0.14 0.420 x x
3.50 03.5 32 0.027 0.777 0.13 0.455 x x
4.00 004. 32 0.022 1.024 0.13 0.520 x x
5.00 005. 32 0.0159 2.30 0.13 0.650 x x
7. 0 0 0 0 7. 32 0.0100 5.02 0.13 0.910 x x
8.00 008. 32 0.008 7.23 0.13 1.040 x x
Electrical Specifications by Item
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.
* - Largely based on Littelfuse internal AEC-Q200 test plan.
RoHS
Pb
Li-ion Battery
LED Lighting
Automotive Navigation
System
TFT Display
Battery Management
System (BMS)
• Clusters
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.
Application testing is strongly recommended.
Additional Information
Datasheet Samples
Resources
% Litleltuse“ mam/Nun \ Amway: umm
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 02/07/19
Ceramic Fuse > 437A Series
Surface Mount Fuses
Average Time Current Curves
Reflow Condition Pb-free assembly
Pre Heat
- Temperature Min (Ts(min))150°C
- Temperature Max (Ts(max))200°C
- Time (Min to Max) (ts)60 – 180 seconds
Average Ramp-up Rate
(Liquidus Temp (TL) to peak) 5°C/second max.
TS(max) to TL - Ramp-up Rate 5°C/second max.
Reflow
- Temperature (TL) (Liquidus)
217°C
- Temperature (tL)60 – 150 seconds
Peak Temperature (TP)260+0/-5 °C
Time within 5°C of actual peak
Temperature (tp)20 – 40 seconds
Ramp-down Rate 5°C/second max.
Time 25°C to peak Temperature (TP)8 minutes max.
Do not exceed 260°C
Wave Soldering
260°C, 10 seconds max.
Soldering Parameters
Temperature Re-rating Curve
40
60
80
100
120
140
-65 -45 -25 -5 15 35 55 75 95 115 135 15 5
TEMPERATURE C)
PERCENT OF RATING
Time
Temperature
TP
TL
TS(max)
TS(min)
25
tP
tL
tS
time to peak temperature
(t 25ºC to peak)
Ramp-down
Ramp-up
Preheat
Critical Zone
TL to TP
Example:
For continuous operation at 75 degrees celsius, the fuse should be rerated as follows:
I = (0.80)(0.85)IRAT = (0.68)IRAT
Note:
1. Re-rating depicted in this curve is in addition to the standard re-rating of 20% for
continuous operation.
0.
001
0.01
0.1
1
10
100
11
0100
TIME IN SECONDS
CURRENT IN AMPERES
0.500A
0.750A
1A
1.25A
1.5A
1.75A
2A
2.5A
3A
5A
4A
3.5A
7A
8A
Part Numbering System
0437 005. W R A
SERIES
AMP CODE
QUANTITY CODE
PACKING CODE
AEC-Q200 QUALIFIED
W = 3000 pcs
R = Tape and Reel
mm m».
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 02/07/19
Ceramic Fuse > 437A Series
Surface Mount Fuses
Materials
Body: Advanced Ceramic
Terminations: Ag/Ni/Sn (100% Lead-free)
Element Cover Coating: Lead-free Glass
Moisture Sensitivity
Level IPC/JEDEC J-STD-020, Level 1
Solderability IPC/EIC/JEDEC J-STD-002, Condition B
Humidity Test MIL-STD-202, Method 103, Conditions D
Resistance to Solder
Heat MIL-STD-202, Method 210, Condition B
Moisture
Resistance MIL-STD-202, Method 106
High Temperature
Storage MIL-STD-202 Method 108 with exemptions
Thermal Shock Test JESD22 Method JA-104,
Test Conditions B and N
Biased Humidity MIL-STD-202 Method 103, 85°C/85% RH with
10% operating power for 1000 hrs
Operational Life MIL-STD-202 Method 108, Test Condition D
Resistance To
Solvents MIL-STD-202 Method 215
Mechanical Shock MIL-STD-202 Method 213, Test Condition C
Product Characteristics
Thermal Shock MIL-STD-202, Method 107,
Condition B
Mechanical Shock MIL-STD-202, Method 213,
Condition A
Vibration MIL-STD-202, Method 201
Vibration,
High Frequency
MIL-STD-202, Method 204,
Condition D
Dissolution of
Metallization
IPC/EIC/JEDEC J-STD-002,
Condition D
Terminal Strength IEC 60127-4
High Frequency
Vibration MIL-STD-202, Method 204
Resistance To
Soldering Heat MIL-STD-202 Method 210, Test Condition B
Solderability JESD22-B102E Method 1
Terminal Strength
For SMD AEC Q200-006
Board Flex AEC Q200-005
Electrical
Characterization 3 Temperature Electrical Characterization
Dimensions
0.520 ± 0.200
[0.020 ± 0.008]
2
3.200 ± 0.1778
[0.126 ± 0.007]
1. 000
[0.039]
1.63 +0.10 / -0.2
[0.064 +0.004 / -0.008] N
1.500
[0.059]
1.800
[0.071]
3.500
[0.138]
1. 000
[0.039]
0.835 ± 0.15
[0.0329 ± 0.006]
Packaging
Part Marking System
Packaging Option Packaging Specification Quantity Quantity and Packaging Code
8mm Tape and Reel EIA-481, IEC 60286, Part 3 3000 WRA
Amp Code Marking Code
.500 F
.750 G
0 01. H
1.25 J
01.5 K
1.75 L
002. N
02.5 O
003. P
3.500 R
004. S
005. T
0 0 7. W
008. |X|
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.
0.520 ± 0.200
[0.020 ± 0.008]
2
3.200 ± 0.1778
[0.126 ± 0.007]
1. 000
[0.039]
1.63 +0.10 / -0.2
[0.064 +0.004 / -0.008] N
1.500
[0.059]
1.800
[0.071]
3.500
[0.138]
1. 000
[0.039]
0.835 ± 0.15
[0.0329 ± 0.0
06]
0.520 ± 0.200
[0.020 ± 0.008]
2
3.200 ± 0.1778
[0.126 ± 0.007]
1. 000
[0.039]
1.63 +0.10 / -0.2
[0.064 +0.004 / -0.008] N
1.500
[0.059]
1.800
[0.071]
3.500
[0.138]
1. 000
[0.039]
0.835 ± 0.15
[0.0329 ± 0.006]
0.520 ± 0.200
[0.020 ± 0.008]
2
3.200 ± 0.1778
[0.126 ± 0.007]
1. 000
[0.039]
1.63 +0.10 / -0.2
[0.064 +0.004 / -0.008] N
1.500
[0.059]
1.800
[0.071]
3.500
[0.138]
1. 000
[0.039]
0.835 ± 0.15
[0.0329 ± 0.006]

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