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TMOV20R750E Datasheet(PDF) 6 Page - Littelfuse |
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TMOV20R750E Datasheet(HTML) 6 Page - Littelfuse |
6 / 9 page 32 www .littelfuse .com Varistor Products TMOV® and iTMOV® Varistor Series * Figure 4: Typical time to open circuit under UL1449 Abnormal Overvoltage Limited Current Test 0.1 1 10 10 100 1000 10000 Time s 0.125A 0.5A 2.5A 5A Typical For applications exceeding 85ºC ambient temperature, the peak surge current and energy ratings must be reduced as shown in Figure 5. Figure 5: Peak Current & Energy Derating Curve 0 20 40 60 80 100 -55 50 60 70 80 90 100 110 120 130 AMBIENT TEMPERATURE (ºC) Thermal Characteristics Transient V-I Characteristic Curves 100 1000 10000 0.000001 0.00001 0.0001 0.001 0.01 0.1 1 10 100 1000 10000 Peak Current (A) 175V 150V 140V 130V 320V 275V 250V 230V Figure 6: V-I Characteristic Curves for 14mm Types 420V 385V 115V Maximum Leakage Current Maximum Clamping Voltage 14mm 200V 460V 510V 550V 575V 625V 750V 100 1000 10000 0.000001 0.00001 0.0001 0.001 0.01 0.1 1 10 100 1000 10000 Peak Current (A) 175V 150V 140V 130V 320V 275V 250V 230V Figure 7: V-I Characteristic Curves for 20mm Types 420V 385V 115V Maximum Leakage Current Maximum Clamping Voltage 20mm 200V 460V 510V 550V 575V 625V 750V 300V Figure 9: Pulse Rating Curves for 20mm types 1 10 100 1000 10000 10 100 1000 10000 Impulse Duration ( s) 1 10 2 10 3 ∞ ∞ Model 20 mm 2 10 4 10 5 10 6 10 Figure 8: Pulse Rating Curves for 14mm types 1 10 100 1000 10000 10 100 1000 10000 Impulse Duration ( s) 1 10 10 2 10 3 ∞ Model 14 mm 2 10 4 10 5 10 6 Pulse Rating Curves Note : The TMOV and iTMOV varistors are intended, in conjunction with appropriate enclosure design, to help facilitate TVSS module compliance to UL 1449, Section 37.4 (abnormal over-voltage limited current require- ments). Under these extreme abnormal over-voltage conditions, the units will exhibit substantial heating and potential venting prior to opening. Modules should be designed to contain this possibility. Application testing is strongly recommended. Thermally Protected NOTE: Average power dissipation of transients should not exceed 1.0W NOTE: Average power dissipation of transients should not exceed 0.6W |
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