V18AUMLA1812WA Ver la hoja de datos (PDF) - Littelfuse, Inc
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V18AUMLA1812WA Datasheet PDF : 9 Pages
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Surface Mount Varistors
Multilayer Transient Voltage Surge Suppressor
AUML Varistor Series
V-I Characteristics Curves
MAXIMUM LEAKAGE
100
1210/1206
10
1812
2220
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MAXIMUM CLAMPING VOLTAGE
1210/1206
1812
2220
1
10mA
100mA
1mA
10mA
100mA
1A
10A
100A
CURRENT
FIGURE 2. MAXIMUM LEAKAGE CURRENT/CLAMPING VOLTAGE CURVE FOR AUML SERIES AT 25oC
100
-40oC
10
25oC
85oC
125oC
1
1mA
10mA
100mA
1mA
10mA
100mA
1A
10A
100A
1000A
CURRENT
FIGURE 3. TYPICAL V-I CHARACTERISTICS OF THE V18AUMLA2220 at -40oC, 25oC, 85oC AND 125oC
Temperature Effects
In the leakage region of the AUML suppressor, the device characteristics
approaches a linear (ohmic) relationship and shows a temperature
dependent affect. In this region the suppressor is in a high resistance
mode (approaching 106Ω) and appears as a near open-circuit. Leakage
currents at maximum rated voltage are in the microamp range. When
clamping transients at higher currents (at and above the ten milliamp
range), the AUML suppressor approaches a 1-10 characteristic. In
this region the characteristics of the AUML are virtually temperature
independent. Figure 3 shows the typical effect of temperature on the
V-I characteristics of the AUML suppressor.
160
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