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Functions of varistor products：
Piezoresistive characteristics is to be added on it when the voltage is lower than its threshold "UN", current flow through the tiny, equivalent to a closing valves, when the voltage is more than the UN, its resistance decreases, which makes the flow through the current surge in, little change and the impact on the rest of the circuit, so as to reduce the influence of overvoltage is sensitive to subsequent circuit. By using this function, the abnormal overvoltage which often occurs in the circuit can be suppressed and the circuit can be protected from the damage of overvoltage.
Advantages of varistor products:
● Fast reaction time, low leakage current
● Superior voltage ratio
● High efficiency surge current processing ability
● Stable performance of restraining voltage characteristics
● The allowable deviation of voltage sensitive voltage is K±10%, L±15%, M±20%
Varistor products application range：
● Protect IC, diode, screen mask semiconductor and other semiconductor electronic components
● Surge absorption of relays and solenoid valves
● Surge protection for communication measurement and electronic control
Product parameters of varistor：
| Part.No | Varistor voltage | Maximum allowable voltage | Maximum limiting voltage | Maximum peak current | Static power | Energy | Typical capacitance | ||
| V1mA (V) | AC | DC | V10A | 1 Time | 2 Times | （W） | (10/1000μs)（J） | 1kHz (PF) | |
| (V) | (V) | (V) | (8/20μs) | (8/20μs) | |||||
| (A) | （A） | ||||||||
| 7D180K | 18V(16-20) | 11 | 14 | ·38 | 250 | 125 | 0.02 | 1.2 | 3,500 |
| 7D220K | 22V(20-24) | 14 | 18 | ·43 | 250 | 125 | 0.02 | 1.4 | 2,800 |
| 7D270K | 27V(24-30) | 17 | 22 | ·53 | 250 | 125 | 0.02 | 1.7 | 2,200 |
| 7D330K | 33V(30-36) | 20 | 26 | ·65 | 250 | 125 | 0.02 | 2.2 | 1,800 |
| 7D390K | 39V(35-43) | 25 | 31 | ·77 | 250 | 125 | 0.02 | 2.4 | 1,450 |
| 7D470K | 47V(42-52) | 30 | 38 | ·93 | 250 | 125 | 0.02 | 3.0 | 1,150 |
| 7D560K | 56V(50-62) | 35 | 45 | ·110 | 250 | 125 | 0.02 | 3.5 | 1,050 |
| 7D680K | 68V(61-75) | 40 | 56 | ·135 | 250 | 125 | 0.02 | 4.3 | 970 |
| 7D820K | 82V(74-90) | 50 | 65 | 135 | 1200 | 600 | 0.25 | 5.5 | 930 |
| 7D101K | 100V(90-110) | 60 | 85 | 165 | 1200 | 600 | 0.25 | 7.0 | 860 |
| 7D121K | 120V(108-132) | 75 | 100 | 200 | 1200 | 600 | 0.25 | 8.0 | 670 |
| 7D151K | 150V(135-165) | 95 | 125 | 250 | 1200 | 600 | 0.25 | 11.0 | 490 |
| 7D181K | 180V(162-198) | 115 | 150 | 300 | 1200 | 600 | 0.25 | 13.0 | 330 |
| 7D201K | 200V(185-225) | 130 | 170 | 340 | 1200 | 600 | 0.25 | 14.3 | 240 |
| 7D221K | 220V(198-242) | 140 | 180 | 360 | 1200 | 600 | 0.25 | 15.5 | 190 |
| 7D241K | 240V(216-264) | 150 | 200 | 395 | 1200 | 600 | 0.25 | 16.8 | 165 |
| 7D271K | 270V(247-303) | 175 | 225 | 455 | 1200 | 600 | 0.25 | 19.8 | 150 |
| 7D301K | 300V(270-330) | 195 | 250 | 505 | 1200 | 600 | 0.25 | 21.0 | 135 |
| 7D331K | 330V(297-363) | 210 | 275 | 550 | 1200 | 600 | 0.25 | 23.0 | 130 |
| 7D361K | 360V(324-396) | 230 | 300 | 595 | 1200 | 600 | 0.25 | 26.0 | 125 |
| 7D391K | 390V(351-429) | 250 | 320 | 650 | 1200 | 600 | 0.25 | 30.0 | 105 |
| 7D431K | 430V(387-473) | 275 | 350 | 710 | 1200 | 600 | 0.25 | 33.0 | 100 |
| 7D471K | 470V(423-517) | 300 | 385 | 775 | 1200 | 600 | 0.25 | 35.0 | 90 |
| 7D511K | 510V(459-561) | 320 | 418 | 842 | 1200 | 600 | 0.25 | 37.0 | 80 |
| 7D561K | 560V(504-616) | 350 | 460 | 920 | 1200 | 600 | 0.25 | 39.0 | 75 |
| The clamping voltage from 180K to 680K is tested with current 2.5A | |||||||||
