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Surface Mount Multilayer Varistors (MLVs) > AUML Series
RoHS
AUML Varistor Series
Description
The AUML Series of Multilayer Transient Surge Suppressors
was specically 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 -55C to 125C.
The AUML suppressor is manufactured from semiconducting
Size Table
ceramics which offer rugged protection and excellent
transient energy absorption in a small package. The devices
Metric EIA
are available in ceramic leadless chip form, eliminating lead
inductance and assuring fast speed of response to transient
surges. These Suppressors require signicantly smaller
3225
space and land pads than Silicon TVS diodes, offering greater
circuit board layout exibility for the designer.
4532 1812
Also see the Littelfuse ML, MLN and MLE Series of
Multilayer Suppressors.
Applications
Features
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current capability
inductive switching transient voltage
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or other transient protection for ICs
t SPmMF
DPNQBDU X1 P -
t PBE%VNQFOFSHZ -
events such as &'5 and transistors
industry standard
rated per SAE
and surge voltage at
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t F W IJF 6TFEUPIFMQBD
Specication J1113
the circuit board level
FT
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electromagnetic
t BDF FBEMFTT
TVSG -
t PS &4%QSPUFDUJPOG compliance of
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mount chip form
components sensitive end products
clamping
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t BDF FQMBDFMBSHFSTVSG 3
t YZ /P1MBTUJDPSFQP
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packaging assures
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many applications t BSJFU ZPGFOFSHZ 7
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industry specications
ratings available
ammability rating
(See Also the MLE
t VSF /PUFNQFSBU
PS.-/4FSJFT
derating up to
125C ambient
Absolute Maximum Ratings
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Continuous AUML Series Units
Steady State Applied Voltage:
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18 V
. %$
Transient:
PBE 8 - %VNQ &OFSHZ
1.5 to 25 J
-%
VNQ + 4U BSU $BQBCJMJU Z NJOVUFT
7
24.5 V
+6.1
O
BOHF 5 VSF3 FNQFSBU 5NCJFOU 0QFSBUJOH
-55 to +125 C
A
O
BOHF 5 VSF3 FNQFSBU 5 4UPSBHF
UP C
STG
O
Temperature Coefficient (D PMU BHF 7 7
7 PG $MBNQJOH FTU SFOU $VS 5
BU 4QFDJGJFE %/ C
C
CAUTION: Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any
other conditions above those indicated in the operational sections of this specication is not implied.
2010 Littelfuse, Inc.
AUML Varistor Series
Specications are subject to change without notice.
Revision: September 14, 2010
Please refer to www.littelfuse.com/series/AUML.html for current information.
AUML Series
Varistor Products
Surface Mount Multilayer Varistors (MLVs) > AUML Series
Device Ratings and Specications
C C
Maximum Ratings (125 ) Specications (25 )
Maximum Jump Start Load Dump Nominal Varistor Voltage Maximum Maximum Clamping
Continuous Voltage Energy at 10mA Standby Leakage Voltage (V ) at
C
Part Number
DC Voltage (5 Min) (10 Pulses) DC Test Current (at 13V DC) Test Current (8/20s)
V V W V Min V Max I V I
. %$
+6.1 -% / %$
/ %$
L C 1
(V) (V) (J) (V) (V) (A) (V) (A)
6. 7 18 24.5 1.5 23 32 1.5
6. 7 18 24.5 23 32 1.5
V18AUMLA1812 18 24.5 23 32
6. 7 18 24.5 25 23 32
PVS-JUF7BOE7BQQMJDBUJPOTQMFBTFDPOU PSBVUPNPUJWBDUZ ' PSUIFMBUF UFMGVTFDPNG MJU FPSWJTJUXXXUFMGVTFSFQSFTFOU BUJW TUQSPEVDU
update.
NOTES:
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FT PSNPEFMTJ[
8BOE8G 8 FMZ TQFDUJW
PMU PBE%VNQFOFSHZSBUJOH JOUPUIFTVQQSFTTPS
PGBWBHFU - NTUPNT SBOTJFOUXJUIBSFTVMU BOUUJNFDPOTU BOUPG
$ LDBQBCJMJU ZQFS.JM4UE
.FUIPE IFSNBMTIPD 5 YU IF NJOVUFTBUFBD DMFT Z $
NJOVUFTBU$
$ UP SFNF
UFMG PSBQQMJDBUJPOTQFDJmDSFRVJSFNFOUT
QMFBTFDPOU BDU-JU ' VTF
Current, Energy and Power Derating Curve Peak Pulse Current Test Waveform for Clamping Voltage
FSBHF W 8IFOUSBOTJFOUTPDDVSJOSBQJETVDDFTTJPO
UIFB
UTFDPOET
QFSQVMTF BU FSEJTTJQBUJPOJTUIFFOFSHZ X X QP
100
times the number of pulses per second. The power so
developed must be within the specications shown on the
PSUIFTQFDJmD BCMFG 5 BUJOHTBOE$IBSBDUFSJTUJDT WJDF3 %F
device. Certain parameter ratings must be derated at high
50
temperatures as shown below.
0
T
100
O TIME
1
90
T
1
80
T
2
70
Figure 2
60
F W B 8 VBM0SJHJOPG 7JSU
50
1
FBL UPPG1 5JNFGSPN 5
40
30 T5 Y 5JNF 3JTF
1
20 T 5JNF Z %FDB
2
10
Example PSBO ' PSN FG W B 8 SFOU T$VS
0
8s = T 5JNF 3JTF
1
-55 50 60 70 80 90 100 110 120 130 140 150
s = T 5JNF Z %FDB
o
2
AMBIENT TEMPERATURE ( C)
Figure 1
Maximum Leakage Current/Clamping Voltage Curve for Typical V-I Characteristics of the V18AUMLA2220 at -40C,
AUML Series at 25C 25C, 85C and 125C
100
MAXIMUM LEAKAGE MAXIMUM CLAMPING VOLTAGE
100
1210/1206
1812
2220
1210/1206 o
-40 C
10
o
10 25 C
1812
2220
o
85 C
o
125 C
1
1
1A 10A 100A 1mA 10mA 100mA 1A 10A 100A 1000A
100mA 100A
10A 100A 1mA 10mA 1A 10A
CURRENT
CURRENT
Figure 3 Figure 4
2010 Littelfuse, Inc.
AUML Varistor Series
Specications are subject to change without notice.
Revision: September 14, 2010
Please refer to www.littelfuse.com/series/AUML.html for current information.
VOLTAGE
PERCENT OF RATED VALUE
VOLTAGE
PERCENT OF PEAK VALUE