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부품번호 V120MLA1210 기능
기능 Multilayer Transient Voltage Surge Suppressors
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V120MLA1210 데이터시트, 핀배열, 회로
Next
Surface Mount Varistors
Multilayer Transient Voltage Surge Suppressors
ML Varistor Series
The ML Series family of Transient Voltage Surge Suppression devices is
based on the Littelfuse Multilayer fabrication technology. These compo-
nents are designed to suppress a variety of transient events, including
those specified in IEC 61000-4-2 or other standards used for Electromagnetic
Compliance (EMC). The ML Series is typically applied to protect integrated
circuits and other components at the circuit board level.
The wide operating voltage and energy range make the ML Series suit-
able for numerous applications on power supply, control and signal lines.
The ML Series is manufactured from semiconducting ceramics, and is
supplied in a leadless, surface mount package. The ML Series is compat-
ible with modern reflow and wave soldering procedures.
It can operate over a wider temperature range than zener diodes, and
has a much smaller footprint than plastic-housed components.
Littelfuse Inc. manufactures other Multilayer Series products. See the
MLE Series data sheet for ESD applications, MHS Series data sheet for
high-speed ESD applications, the MLN for multiline protection and the
AUML Series for automotive applications.
Features
Leadless 0402, 0603, 0805, 1206 and 1210 Chip Sizes
Multilayer Ceramic Construction Technology
-55oC to +125oC Operating Temperature Range
Operating Voltage Range VM(DC) = 5.5V to 120V
Rated for Surge Current (8 x 20µs)
Rated for Energy (10 x 1000µs)
Inherent Bi-directional Clamping
No Plastic or Epoxy Packaging Assures Better than 94V-0
Flammability Rating
Standard Low Capacitance Types Available
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
Previous
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V120MLA1210 pdf, 반도체, 판매, 대치품
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Previous
Surface Mount Varistors
Multilayer Transient Voltage Surge Suppressors
ML Varistor Series
Temperature De-rating
When transients occur in rapid succession, the average power dissipa-
tion 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 Specifications table for the specific
device. For applications exceeding 125oC ambient temperature, the peak
surge current and energy ratings must be derated as shown in Figure 1.
100
80
60
40
20
0
-55
50 60 70 80 90 100 110 120 130 140 150
AMBIENTTEMPERATURE ( oC)
FIGURE 1. PEAK CURRENT AND ENERGY
DERATING CURVE
100
50
0
O1
t
t1
TIME
t2
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
FOR CLAMPING VOLTAGE
O1 = VIRTUAL ORIGIN OFWAVE
t = TIME FROM 10% TO 90% OF PEAK
t1 = VIRTUAL FRONT TIME = 1.25 x t
t2 = VIRTUALTIME TO HALFVALUE
(IMPULSE DURATION)
EXAMPLE:
FOR AN 8/20µs CURRENT WAVEFORM
8µs = t1 = VIRTUAL FRONT TIME
20µs = t2 = VIRTUALTIME TO
HALF VALUE
3
100
MAXIMUM CLAMPING VOLTAGE
MAXIMUM LEAKAGE
10
V18MLA0402
V14MLA0402
V09MLA0402
V5.5MLA0402
1 µA
10µA
100µA
1mA
10mA
100mA
1A
CURRENT (A)
10A 100A
FIGURE 3. LIMIT V-I CHARACTERISTIC FOR V5.5MLA0402 TO V18MLA0402
www.littelfuse.com
143

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V120MLA1210 전자부품, 판매, 대치품
Next
Surface Mount Varistors
Multilayer Transient Voltage Surge Suppressors
Previous
ML Varistor Series
Device Characteristics
At low current levels, the V-I curve of the multilayer transient voltage
suppressor approaches a linear (ohmic) relationship and shows a
temperature dependent effect (Figure 10). At or below the maximum
working voltage, the suppressor is in a high resistance mode (approach-
ing 106at its maximum rated working voltage). Leakage currents at
maximum rated voltage are below 50µA, typically 25µA; for 0402 size
below 10µA, typically 5µA.
100%
100
V26MLA1206
V5.5MLA1206
10%
1E-9
25o 50o 75o 100o 125oC
1E-8
1E-7
1E-6
1E-5
1E-4
1E-3
1E-2
SUPPRESSOR CURRENT (ADC)
FIGURE 10. TYPICAL TEMPERATURE DEPENDANCE OF THE CHARACTERISTIC
CURVE IN THE LEAKAGE REGION
Speed of Response
The Multilayer Suppressor is a leadless device. Its response time is not
limited by the parasitic lead inductances found in other surface mount
packages. The response time of the Zinc Oxide dielectric material is less
than 1 nanosecond and the ML can clamp very fast dV/dT events such
as ESD. Additionally, in real worldapplications, the associated circuit
wiring is often the greatest factor effecting speed of response. Therefore,
transient suppressor placement within a circuit can be considered
important in certain instances.
FIRED CERAMIC
DIELECTRIC
10
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (oC)
FIGURE 12. CLAMPING VOLTAGE OVER TEMPERATURE
(VC AT 10A)
Energy Absorption/Peak Current Capability
Energy dissipated within the ML is calculated by multiplying the clamping
voltage, transient current and transient duration. An important advantage
of the multilayer is its interdigitated electrode construction within the mass
of dielectric material. This results in excellent current distribution and the
peak temperature per energy absorbed is very low. The matrix of semicon-
ducting grains combine to absorb and distribute transient energy (heat)
(Figure 11). This dramatically reduces peak temperature; thermal stresses
and enhances device reliability.
As a measure of the device capability in energy and peak current
handling, the V26MLA1206A part was tested with multiple pulses at its
peak current rating (150A, 8/20µs). At the end of the test, 10,000 pulses
later, the device voltage characteristics are still well within specification
(Figure 13).
100
PEAK CURRENT = 150A
8/20µs DURATION, 30s BETWEEN PULSES
V26MLA1206
METAL END
TERMINATION
METAL
ELECTRODES
DEPLETION
REGION
DEPLETION
REGION
GRAINS
FIGURE 11. MULTILAYER INTERNAL CONSTRUCTION
10
0
2000
4000
6000
8000
NUMBER OF PULSES
10000
12000
FIGURE 13. REPETITIVE PULSE CAPABILITY
146 w w w . l i t t e l f u s e . c o m

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V120MLA1210

Multilayer Transient Voltage Surge Suppressors

Littelfuse
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