Varistor Products
Surface Mount Multilayer Varistors (MLVs) > AUML Series
RoHS
AUML Varistor Series
The AUML Series of Multilayer Transient Surge Suppressors
was specifically designed to suppress the destructive
transient voltages found in an automobile. The most common
transient condition results from large inductive energy
discharges. The electronic systems in the automobile, e.g.
antilock brake systems, direct ignition systems, engine
control, airbag control systems, wiper motor controls, etc.,
are susceptible to damage from these voltage transients and
thus require protection. The AUML transient suppressors
have temperature independent suppression characteristics
affording protection from -55ºC to 125ºC.
The AUML suppressor is manufactured from semiconducting
ceramics which offer rugged protection and excellent
transient energy absorption in a small package. The devices
are available in ceramic leadless chip form, eliminating lead
inductance and assuring fast speed of response to transient
surges. These Suppressors require significantly smaller
space and land pads than Silicon TVS diodes, offering greater
circuit board layout flexibility for the designer.
Size Table
Metric
EIA
3225
4532
1812
Also see the Littelfuse ML, MLN and MLE Series of
Multilayer Suppressors.
Applications
Features
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inductive switching
or other transient
events such as &'5
and surge voltage at
the circuit board level
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components sensitive
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industry specifications
(See Also the MLE
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transient voltage
protection for ICs
and transistors
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electromagnetic
compliance of
end products
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many applications
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rated per SAE
Specification J1113
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mount chip form
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Inductance
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ratings available
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current capability
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industry standard
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clamping
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packaging assures
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flammability rating
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derating up to
125ºC ambient
Absolute Maximum Ratings
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Continuous
AUML Series
Units
18
V
1.5 to 25
24.5
-55 to +125
UP
J
V
O
C
O
C
%/OC
Steady State Applied Voltage:
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Transient:
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Temperature Coefficient (D7
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CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any
other conditions above those indicated in the operational sections of this specification is not implied.
©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/AUML.html for current information.
AUML Varistor Series
Revision: September 14, 2010
AUML Series
Description
Varistor Products
Surface Mount Multilayer Varistors (MLVs) > AUML Series
Device Ratings and Specifications
Maximum Ratings (125ºC)
Maximum
Jump Start Load Dump
Continuous
Voltage
Energy
DC Voltage
(5 Min)
(10 Pulses)
V. %$
V+6.1
W-%
Part Number
(V)
(V)
(J)
Specifications (25ºC)
Nominal Varistor Voltage
Maximum
at 10mA
Standby Leakage
DC Test Current
(at 13V DC)
V/ %$
Min
V/ %$
Max
IL
(V)
(V)
(μA)
Maximum Clamping
Voltage (VC) at
Test Current (8/20μs)
VC
I1
(V)
(A)
7"6.-"
18
24.5
1.5
23
32
1.5
7"6.-"
18
24.5
23
32
1.5
V18AUMLA1812
18
24.5
23
32
7"6.-"
18
24.5
25
23
32
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update.
NOTES:
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8
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Current, Energy and Power Derating Curve
Peak Pulse Current Test Waveform for Clamping Voltage
100
50
0
T
O1
90
PERCENT OF RATED VALUE
100
PERCENT OF PEAK VALUE
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times the number of pulses per second. The power so
developed must be within the specifications shown on the
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device. Certain parameter ratings must be derated at high
temperatures as shown below.
TIME
T1
80
T2
Figure 2
70
60
1 7JSUVBM0SJHJOPG8BWF
5 5JNFGSPNUPPG1FBL
T1 3JTF5JNF Y5
T2 %FDBZ5JNF
Example 'PSBOμT$VSSFOU8BWFGPSN
8μs = T1 3JTF5JNF
μs = T2 %FDBZ5JNF
50
40
30
20
10
0
-55
50
60
70
80
90
100 110
120
130
140 150
AMBIENT TEMPERATURE (oC)
Figure 1
Maximum Leakage Current/Clamping Voltage Curve for
AUML Series at 25ºC
MAXIMUM LEAKAGE
Typical V-I Characteristics of the V18AUMLA2220 at -40ºC,
25ºC, 85ºC and 125ºC
100
MAXIMUM CLAMPING VOLTAGE
100
1210/1206
1812
2220
VOLTAGE
VOLTAGE
1210/1206
10
1812
2220
-40oC
10
25oC
85oC
125 oC
1
1
10μA
Figure 3
100μA
1mA
100mA
10mA
CURRENT
1A
10A
100A
1μA
10μA
100μA
1mA
10mA
100mA
1A
10A
100A
1000A
CURRENT
Figure 4
AUML Varistor Series
Revision: September 14, 2010
©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/AUML.html for current information.
Varistor Products
Surface Mount Multilayer Varistors (MLVs) > AUML Series
Temperature Effects
In the leakage region of the AUML suppressor, the device
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and shows a temperature dependent affect. In this region
the suppressor is in a high resistance mode (approaching
æ
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at maximum rated voltage are in the microamp range.
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of the AUML are virtually temperature independent.
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the V-I characteristics of the AUML suppressor.
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the automobile is abruptly reduced. The worst case scenario
of this transient occurs when the battery is disconnected
while operating at full rated load. There are a number of
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automotive industry, with the most common one being that
recommended by the Society of Automotive Engineers,
specification #SAE J1113. Because of the diversity of these
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that energy dissipated by the device itself, independent
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handling capability serves as an excellent figure of merit for
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capability requirement is well within the ratings of all of the
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The very high energy absorption capability of the AUML
suppressor is achieved by means of a highly controlled
manufacturing process. This technology ensures that a
large volume of suppressor material, with an interdigitated
layer construction, is available for energy absorption in an
extremely small package. Unlike equivalent rated Silicon
TVS diodes, the entire AUML device volume is available to
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energy, which are applied to the devices. The reliability
information thus generated gives an indication of the
inherent capability of these devices. As an example of
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all cases there has been little or no change in the device
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Experience has shown that while the effects of a load dump
tranient is of real concern, its frequency of occurrence is
much less than thoe of low energy inductive spikes. Such
low energy inductive spikes may be generated as a result
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blowing, etc. It is essential that the suppression technology
selected also has the capability to suppress such transients.
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even energy dissipation ensures that there are lower peak
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AUML suppressor.
There are a number of different size devices available in the
AUML Series, each one with a load dump energy rating,
which is size dependent.
Speed of Response
The clamping action of the AUML suppressor depends
on a conduction mechanism similar to that of other
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slow response time often associated with transient
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parasitic inductance in the package and leads of the
device and less dependent of the basic material (Silicon,
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response time of any suppressor is its lead induc-tance.
The AUML suppressor is a surface mount device, with no
leads or external packaging, and thus, it has virtually zero
inductance. The actual response time of a AUML surge
suppressor is in the 1 to 5 ns range, more than sufficient
for the transients which are likely to be encountered in an
automotive environment.
©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/AUML.html for current information.
Multilayer Internal Construction
Figure 5
AUML Varistor Series
Revision: September 14, 2010
AUML Series
Load Dump Energy Capability
Varistor Products
Surface Mount Multilayer Varistors (MLVs) > AUML Series
AUML Load Dump Pulsing over a Temperature Range of
-55ºC to +125ºC
Maximum Continuous DC Working Voltage (*V. %$
+)
V(10mA)
35
25
VOLTAGE
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be applied, up to the maximum operating temperature
$
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reference test point for leakage current and is always less
than the breakdown voltage of the device.
2220 = 25J
1812 = 6J
1210 = 3J
30
20
15
10
Load Dump Energy Rating *W-%+
5
0
Explanation of Terms
0
1
2
3
4
5
6
7
8
9
10
11
12
# OF LOAD DUMPS
Figure 6
This is the actual energy the part is rated to dissipate
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Maximum Clamping Voltage *VC+
This is the peak voltage appearing across the suppressor
when measured at conditions of specified pulse current
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*UJTJNQPSUBOUUPOPUF
that the peak current and peak voltage may not necessarily
be coincidental in time.
Repetitive Load Dump Pulsing at Rated Energy
V(10mA)
35
2220 = 25J
1812 = 6J
30
1210 = 3J
VOLTAGE
25
20
15
10
5
0
0
50
100
150
200
250
300
350
1,000
# OF LOAD DUMPS
Figure 7
2,000
Leakage Current *IL+
In the nonconducting mode, the device is at a very
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system. The leakage current drawn at this level is very
low (
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