437 Datasheet, PDF (1/4 Pages) Littelfuse – Surface Mount Fuses

Surface Mount Fuses
Ceramic Fuse > 437 Series
437 Series – 1206 Fast-Acting Fuse
Description
This 100% Lead-free, RoHS compliant and Halogen-free
fuse series has been designed specifically to provide over
current protection to circuits that see high working ambient
temperatures (up to 150ºC).
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
E10480
LR29862
AMPERE RANGE
0.250A ~ 8A
0.250A ~ 8A
Electrical Characteristics for Series
% of Ampere
Rating
100%
250%
350%
350%
Ampere Rating
250mA - 8A
750mA - 8A
250mA -500mA
750mA - 8A
Opening Time at 25ºC
4 hours, Minimum
5 seconds, Maximum
5 seconds, Maximum
1 second, Maximum
Features
t
0QFSBUJOH
5FNQFSBUVSF

from -55ºC to +150ºC
t

-FBEGSFF
BOE

RoHS compliant
t
4VJUBCMF
GPS
CPUI
MFBEFE

and lead-free reflow /
wave soldering
Applications
t
"VUPNPUJWF
&MFDUSPOJDT
t
-$%
%JTQMBZT
t
4FSWFST
t
1SJOUFST
t
4DBOOFST
t
%BUB
.PEFNT
Electrical Specifications by Item
Ampere
Rating
(A)
Amp
Code
Max.
Voltage
Rating (V)
250mA .250 125
375mA .375 125
500mA .500
63
750mA .750
63
1A 001.
63
1.25A 1.25
63
1.5A 01.5
63
1.75A 1.75
63
2A 002.
63
2.5A 02.5
32
3A 003.
32
3.5A 03.5
32
4A 004.
32
5A 005.
32
7A 007.
32
8A 008.
32
Interrupting Rating
50 A @ 125 V AC/DC
50 A @ 63 V AC/DC
50 A @ 32 V AC/DC
Nominal Nominal Nominal Voltage Nominal Power ^{Agency Approvals}
Resistance Melting I²t Drop At Rated Dissipation At
(Ohms)² (A²Sec.)³
Current (V)⁴ Rated Current (W)
2.290
1.330
0.908
0.665
0.360
0.318
0.209
0.0703
0.058
0.043
0.033
0.027
0.022
0.016
0.010
0.0084
0.003
0.010
0.018
0.064
0.100
0.256
0.324
0.075
0.144
0.225
0.400
0.576
1.024
1.936
4.900
6.400
0.78
0.60
0.52
0.45
0.41
0.40
0.39
0.27
0.17
0.14
0.15
0.16
0.16
0.09
0.11
0.067
0.195
0.225
0.260
0.335
0.415
0.496
0.579
0.474
0.345
0.363
0.462
0.560
0.618
0.484
0.760
0.539
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
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 msecs. opening time.
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 continuously at no more than 80% rated current. See “Temperature
Rerating Curve”for additional rerating information.
Devices designed to be mounted with marking code facing up.
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/437.html for current information.
17
Revised: August 3, 2009
437 Series