ZINC OXIDE VARISTORS Introduction
ZINC OXIDE VARISTORS Introduction
ZINC OXIDE VARISTORS Introduction
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Zinc Oxide Varistors<br />
Reliability<br />
Test Description Test Condition Test Requirement<br />
SURGE CURRENT DERATING CECC 42000, Test C 2.1 • I Delta V/V (1 mA) I max 10%<br />
8/20 MICRO SECONDS 100 surge currents (8/20 µs), unipolar, Measured in the direction of the<br />
interval 30 s, amplitude corresponding<br />
surge current<br />
to derating curve for 20 µs.<br />
• No visible damage<br />
SURGE CURRENT DERATING CECC 42000, Test C 2.1 • I Delta V/V (1 mA) I max 10%<br />
10/1000 MICRO SECONDS 100 surge currents (10/1000 µs), unipolar, Measured in the direction of the<br />
interval 120 s, amplitude corresponding<br />
surge current<br />
to derating curve for 1000 µs.<br />
• No visible damage<br />
RESISTANCE TO SOLDERING IEC 68-2-20, Test Tb Method 1A • I Delta V/V (1 mA) I max 5%<br />
HEAT<br />
260°C, 5 s<br />
RAPID CHANGE IN IEC 68-2-14, Test Na • I Delta V/V (1 mA) I max 5%<br />
TEMPERATURE<br />
Ta = -40°C; Tb = +85°C<br />
Duration: 1 Hr/cycle<br />
• No visible damage<br />
Total: 5 cycles<br />
SHOCK IEC 68-2-27, Test Ea • I Delta V/V (1 mA) I max 5%<br />
Pulse shape: half sine<br />
Acceleration: 490 m/s/s<br />
• No visible damage<br />
Pulse duration: 11 ms<br />
3 x 6 shocks<br />
VIBRATION IEC 68-2-6, Test Fc Method B4 • I Delta V/V (1 mA) I max 5%<br />
Freq. range: 10 Hz ... 55 Hz<br />
Amplitude: 0.75 mm or 98 m/s/s<br />
• No visible damage<br />
Duration: 6 h (3 x 2 h)<br />
CLIMATIC SEQUENCE CECC 42000, Test 4.16 • I Delta V/V (1 mA) I max 10%<br />
a) Dry heat - Test Ba<br />
Temperature / Duration: 125°C / 2 h • Insulation Resistance min 1 Mohm<br />
b) Damp heat cyclic 1st cycle - Test Db<br />
Temperature / Duration: 55°C / 24 h<br />
Humidity: 95-100% RH<br />
c) Cold - Test Aa<br />
Temperature / Duration: -40°C / 2 h<br />
d) Damp heat cyclic test remaining<br />
5 humidity cycles - Test Db<br />
Duration: 24 h/cycle<br />
LIFE TEST CECC 42000, Test 4.20 • I Delta V/V (1 mA) I max 10%<br />
Applied voltage: max continuous a.c.<br />
Voltage, continuous application<br />
• Insulation Resistance min 10 Mohm<br />
Temperature / Duration: 85°C / 1000 h<br />
DAMP HEAT, STEADY STATE IEC 68-2-3 • I Delta V/V (1 mA) I max 10%<br />
Temperature / Duration: 40°C / 56 days<br />
Humidity: 93%<br />
• Insulation Resistance min 1 Mohm<br />
FLAMMABILITY - IEC 695-2-2 • Burning max 10 s<br />
NEEDLE FLAME TEST<br />
Vertical application: 10 s<br />
TEMPERATURE COEFFICIENT Current: 1 mA • - (0.09%/K) max<br />
OF VOLTAGE<br />
Temperature: -40°C / +25°C / +85°C<br />
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