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AUML 데이터시트 PDF




Littelfuse에서 제조한 전자 부품 AUML은 전자 산업 및 응용 분야에서
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부품번호 AUML 기능
기능 Multilayer Transient Voltage Surge Suppressor
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AUML 데이터시트, 핀배열, 회로
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Surface Mount Varistors
Multilayer Transient Voltage Surge Suppressor
AUML Varistor Series
The AUML Series of Multilayer Transient Surge Suppressors was specifi-
cally 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
Load Dump Energy Rated per SAE Specification J1113
Leadless, Surface Mount Chip Form
• “ZeroLead 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
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AUML pdf, 반도체, 판매, 대치품
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Previous
Surface Mount Varistors
Multilayer Transient Voltage Surge Suppressor
AUML Varistor Series
Load Dump Energy Capability
A Load dump transient occurs when the alternator load in 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 different load dump specifications in existence in the
automotive industry, with the most common one being that recommend-
ed by the Society of Automotive Engineers, specification #SAE J1113.
Because of the diversity of these load dump specifications Littelfuse
defines the load dump energy capability of the AUML suppressor range
as that energy dissipated by the device itself, independent of the test
circuit setup. The resultant load dump energy handling capability serves
as an excellent figure of merit for the AUML suppressor. Standard load
dump specifications require a device capability of 10 pulses at rated
energy, across a temperature range of -40oC to 125oC. This capability
requirement is well within the ratings of all of the AUML series (Figure 5).
Further testing on the AUML series has concentrated on extending the
number of load dump pulses, at rated 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 device durabil-
ity the 1210 size has been subjected to over 2000 pulses at its rated
energy of 3 joules; the 1812 size has been pulsed over 1000 times at 6
joules and 2220 size has been pulsed at its rated energy of 25 joules
over 300 times. In all cases there has been little or no change in the
device characteristics (Figure 6).
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 largevolume 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 dissipate the load dump energy.
Hence, the peak temperatures generated by the load dump transient are sig-
nificantly lower and evenly dissipated throughout the complete device (Figure
4). This even energy dissipation ensures that there are lower peak tempera-
tures generated at the P-N grain boundaries of the 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.
Experience has shown that while the effects of a load dump transient is
of real concern, its frequency of occurrence is much less than those of
low energy inductive spikes. Such low energy inductive spikes may be
generated as a result of motors switching on and off, from ESD occur-
rences, fuse blowing, etc. It is essential that the suppression technology
selected also has the capability to suppress such transients. Testing on
the V18AUMLA2220 has shown that after being subjected to a repetitive
energy pulse of 2 joules, over 6000 times, no characteristic changes
have occurred (Figure 7.)
3
Speed of Response
The clamping action of the AUML suppressor depends on a conduction
mechanism similar to that of other semiconductor devices (i.e. P-N
Junctions). The apparent slow response time often associated with
transient voltage suppressors (Zeners, MOVs) is often due to parasitic
inductance in the package and leads of the device and less dependent
of the basic material (silicon, zinc oxide). Thus, the single most critical
element affecting the 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 nanosecond
range, more than sufficient for the transients which are likely to be
encountered in an automotive environment.
www.littelfuse.com
161

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AUML 전자부품, 판매, 대치품
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Surface Mount Varistors
Multilayer Transient Voltage Surge Suppressor
AUML Varistor Series
Recommended Pad Outline
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Leakage Current (IL)
In the nonconducting mode, the device is at a very high impedance
(approaching 106at its rated working voltage) and appears as an almost
open circuit in the system. The leakage current drawn at this level is very
low (<25µA at ambient temperature) and, unlike the zener diode, the
multilayer TVS has the added advantage that, when operated up to its
maximum temperature, its leakage current will not increase above 500µA.
Nominal Voltage (VN(DC))
This is the voltage at which the AUML enters its conduction state and
begins to suppress transients. In the automotive environment this voltage
is defined at the 10mA point and has a minimum (VN(DC) MIN) and
maximum (VN(DC) MAX) voltage specified.
Mechanical Dimensions
E
Explanation of Terms
Maximum Continuous DC Working Voltage (VM(DC))
This is the maximum continuous DC voltage which may be applied, up to
the maximum operating temperature (125oC), to the ML suppressor. This
voltage is used as the reference test point for leakage current and is
always less than the breakdown voltage of the device.
Load Dump Energy Rating (WLD)
This is the actual energy the part is rated to dissipate under load dump
conditions (not to be confused with the source energyof a load dump
test specification).
Maximum Clamping Voltage (VC)
This is the peak voltage appearing across the suppressor when meas-
ured at conditions of specified pulse current and specified waveform
(8/20µs). It is important to note that the peak current and peak voltage
may not necessarily be coincidental in time.
D
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