Surface Mount Multilayer Varistors (MLVs) > AUML Series
Metal-Oxide Varistors
(MOVs)
AUML Varistor Series
Description
RoHS
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.
Size Table
Metric
3216
3225
4532
5650
EIA
1206
1210
1812
2220
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.
Also see the Littelfuse ML, MLN and MLE Series of
Multilayer Suppressors.
Features
Applications
•
Suppression of
inductive switching
or other transient
events such as EFT
and surge voltage at
the circuit board level
ESD protection for
components sensitive
to IEC 61000-4-2
(Level 4), MIL-STD-
883C, Method 3015.7
,
and other industry
specifications (See
Also the MLE or
MLN Series)
•
Provides on-board
transient voltage
protection for ICs
and transistors
Used to help achieve
electromagnetic
compliance of
end products
Replace larger surface
mount TVS Zeners in
many applications
•
•
•
AEC - Q200 compliant
RoHS Compliant
Load Dump energy
rated per SAE
Specification J1113
Leadless, surface
mount chip form
“Zero” Lead Inductance
Variety of energy
ratings available
No temperature derating
up to 125ºC ambient
•
•
High peak surge
current capability
Low Profile, compact
industry standard chip
size; (1206, 1210, 1812
and 2220 Sizes)
Inherent bidirectional
clamping
No Plastic or epoxy
packaging assures
better than 94V-0
flammability rating
•
•
•
•
•
•
•
•
•
Absolute Maximum Ratings
• For ratings of individual members of a series, see Device Ratings and Specifications chart.
Continuous
Steady State Applied Voltage:
AUML Series
DC Voltage Range (V
M(DC)
)
18, 24, 48, 68
1.5 to 25
48
-55 to +125
-55 to +150
<0.01
Units
V
J
V
O
C
O
C
%/
O
C
Transient:
Load Dump Energy, (W
LD
)
Jump Start Capability (5 minutes), (V
JUMP
)
Operating Ambient Temperature Range (T
A
)
Storage Temperature Range (T
STG
)
Temperature Coefficient (αV) of Clamping Voltage (V
C
) at Specified Test Current
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.
Specifications are subject to change without notice.
Revised: 09/14/17
Metal-Oxide Varistors
(MOVs)
Surface Mount Multilayer Varistors (MLVs) > AUML Series
Device Ratings and Specifications
Maximum Ratings (125
ºC
)
Maximum
Jump Start Load Dump
Continuous
Voltage
Energy
DC Voltage
(5 Min)
(10 Pulses)
V
M(DC)
V
JUMP
W
LD
(V)
V18AUMLA1206
V18AUMLA1210
V18AUMLA1812
V18AUMLA2220
V24AUMLA2220
V48AUMLA2220
V68AUMLA2220
18
18
18
18
24
48
68
Part Number
Specifications (25
ºC
)
Nominal Varistor Voltage
Maximum
at 10mA
Standby Leakage
DC Test Current
(at 13V DC)
V
N(DC)
Min
V
N(DC)
Max
I
L
(V)
23
23
23
23
32
54.5
77
.2
Maximum Clamping
Voltage (V
C
) at
Test Current (8/20µs)
V
C
I
P
(V)
40
40
40
40
60
105
135
(V)
24.5
24.5
24.5
24.5
24.5
24.5
24.5
(J)
1.5
3.0
6.0
25
25
25
25
(V)
32
32
32
32
39
66.5
94.4
(µA)
50
50
100
200
200
200
200
(A)
1.5
1.5
5.0
10.0
10.0
10.0
10.0
NOTES: 1. Average power dissipation of transients not to exceed 0.1W, 0.15W, 0.3W and 1W for model sizes 1206, 1210, 1812 and 2220 respectively.
2. Load dump :min. time of energy input 40ms, interval 60sec(the load dump time constant Td differs from the time constant of energy input; load dump rating for ISO 7637-2 pulse
5a, please contact littelfuse.
3. Thermal shock capability per Mil-Std-750, Method 1051: -55ºC to 125ºC, 5 minutes at 25ºC, 25 Cycles: 15 minutes at each extreme.
4. For application specific requirements, please contact Littelfuse.
Current, Energy and Power Derating Curve
When transients occur in rapid succession, the average
power dissipation is the energy (watt-seconds) per pulse
times the number of pulses per second. The power so
developed must be within the specifications shown on the
Device Ratings and Characteristics Table for the specific
device. Certain parameter ratings must be derated at high
temperatures as shown below.
100
PERCENT OF RATED VALUE
90
80
70
60
50
40
30
20
10
0
-55
50
60
70
80
90
100 110
120
130
140 150
Peak Pulse Current Test Waveform for Clamping Voltage
100
PERCENT OF PEAK VALUE
50
0
O
1
T
T
1
TIME
MAXIMUM CLAMPING VOLTAGE
MAXIMUM LEAKAGE
100
Figure 2
T
2
1210/1206
1812
2220
10
Figure 1
AMBIENT TEMPERATURE (
o
C)
FIGURE 1. CURRENT, ENERGY AND POWER DERATING
Maximum Leakage Current/Clamping Voltage Curve
CURVE
for
t
1
= VIRTUAL FRONT TIME = 1.25 x t
1mA
10µA
100µA
1A
10A
VALUE
100mA
t
2
= VIRTUAL TIME TO HALF
10mA
CURRENT
(IMPULSE DURATION)
the V18AUMLA2220
Typical V-I Characteristics of
1
0
1
= Virtual Origin of Wave
T = Time from 10% to 90% of Peak
1210/1206
T
1
= Rise Time = 1.25 x T
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
1812
T
2
= Decay Time
2220
FOR CLAMPING VOLTAGE
Example
- For an 8/20
µs
Current Waveform:
O
1
= VIRTUAL
T
1
= Rise
WAVE
8µs =
ORIGIN OF
Time
t = TIME FROM 10% TO 90% OF PEAK
20µs = T
2
= Decay Time
VOLTAGE
100A
at -40ºC,
AUML Series at 25ºC
EXAMPLE:
25ºC, 85ºC and 125ºC
FIGURE 2. MAXIMUM LEAKAGE CURRENT/CLAMPING VOLTAGE CURVE FOR AUML SERIES AT 25
o
C
FOR AN 8/20 s CURRENT WAVEFORM
8 s = t
1
= VIRTUAL FRONT TIME
20 s = t
2
= VIRTUAL TIME TO
HALF VALUE
MAXIMUM LEAKAGE
MAXIMUM CLAMPING VOLTAGE
1210/1206
1812
2220
100
100
VOLTAGE
VOLTAGE
1210/1206
10
-40
o
C
25
o
C
10
1812
2220
85
o
C
125
o
C
1
1
Figure 3
10µA
100µA
1mA
100mA
10mA
CURRENT
1A
10A
100A
1µA
10µA
100µA
1mA
10mA
CURRENT
100mA
1A
10A
100A
1000A
Figure 4
FIGURE 2. MAXIMUM LEAKAGE CURRENT/CLAMPING VOLTAGE CURVE FOR AUML SERIES AT 25
o
C
FIGURE 3. TYPICAL V-I CHARACTERISTICS OF THE V18AUMLA2220 at -40
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