Littelfuse AUML Varistor Series - Manual

© 2013 Littelfuse, Inc. 55
Revised: May 8, 2013
Varistor Products
AUML Varistor Series
Surface Mount Multilayer Varistors (MLVs) > AUML Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/AUML.html for current information.
AUML Series
AUML Varistor Series
RoHS
Description
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.
Also see the Littelfuse ML, MLN and MLE Series of
Multilayer Suppressors.
Features
• 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
Size Table
Metric EIA
3216 1206
3225 1210
4532 1812
5650 2220
Absolute Maximum Ratings
• For ratings of individual members of a series, see Device Ratings and Specifications chart.
Continuous AUML Series Units
Steady State Applied Voltage:
DC Voltage Range (V
M(DC)
) 18 V
Transient:
Load Dump Energy, (W
LD
) 1.5 to 25 J
Jump Start Capability (5 minutes), (V
JUMP
) 24.5 V
Operating Ambient Temperature Range (T
A
) -55 to +125 O C
Storage Temperature Range (T
STG
) -55 to +150 O C
Temperature Coefficient (DV) of Clamping Voltage (V
C
) at Specified Test Current <0.01 %/ O 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 specification is not implied.
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, 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