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V14MLA0805 Datasheet(PDF) 7 Page - Littelfuse |
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V14MLA0805 Datasheet(HTML) 7 Page - Littelfuse |
7 / 11 page Multilayer Transient Voltage Surge Suppressors ML Varistor Series Surface Mount Varistors 146 www .littelfuse .com 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 106 Ω at its maximum rated working voltage). Leakage currents at maximum rated voltage are below 50µA, typically 25µA; for 0402 size below 10µA, typically 5µA. 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 world” applications, 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. 100% 1E-9 1E-8 SUPPRESSOR CURRENT (ADC) 10% 1E-7 1E-6 1E-5 1E-4 1E-3 1E-2 25 50 75 100 125oC FIGURE 10. TYPICAL TEMPERATURE DEPENDANCE OF THE CHARACTERISTIC CURVE IN THE LEAKAGE REGION o o o o GRAINS DEPLETION FIRED CERAMIC DIELECTRIC REGION METAL ELECTRODES DEPLETION REGION METAL END TERMINATION FIGURE 11. MULTILAYER INTERNAL CONSTRUCTION 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 10 20 V26MLA1206 40 60 80 100 120 140 TEMPERATURE (oC) V5.5MLA1206 0 -20 -40 -60 FIGURE 12. CLAMPING VOLTAGE OVER TEMPERATURE (VC AT 10A) 100 10 0 V26MLA1206 2000 4000 6000 8000 10000 12000 NUMBER OF PULSES FIGURE 13. REPETITIVE PULSE CAPABILITY PEAK CURRENT = 150A 8/20 µs DURATION, 30s BETWEEN PULSES Next Previous |
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