压敏电阻是典型的钳位型过压器件,在实际过压防护中,利用的非线性特性,当过电压出现在的两极间,压敏电阻可以将电压钳位到一个相对固定的电压值,从而实现对后级电路的保护。其优点也是极为显着的通流量大(100A~70kA)其体积越大所能承受的浪涌电流越大、种类齐全,使用范围广;其缺点也广为人知:
1、压敏电阻的非线性特性较差(动态电阻较大);
2、大电流时限制电压(箝位电压)较高;
3、低电压时漏电流较大,较易老化。


| Part No |
Maximum
Allowable |
Maximum |
Withstanding |
Rated |
Varistor Voltage |
Maximum |
| Wattage |
Clamping |
| Voltage |
Energy |
Surge Current
8/20uS |
Voltage |
| ACrms |
DC |
10/1000us |
1 times |
2 times |
(W) |
At 0.1mA |
At 5A |
| (V) |
(V) |
(J) |
(A) |
(V) |
(V) |
| 05D180L |
10 |
14 |
0.4 |
100 |
50 |
0.01 |
18(15-21) |
38 |
| 05D220K |
14 |
18 |
0.6 |
100 |
50 |
0.01 |
22(20-24) |
43 |
| 05D270K |
17 |
22 |
0.7 |
100 |
50 |
0.01 |
27(24-30) |
53 |
| 05D330K |
20 |
26 |
0.8 |
100 |
50 |
0.01 |
33(30-36) |
65 |
| 05D390K |
25 |
31 |
1.1 |
100 |
50 |
0.01 |
39(35-43) |
77 |
| 05D470K |
30 |
38 |
1.4 |
100 |
50 |
0.01 |
47(42-52) |
39 |
| 05D560K |
35 |
45 |
1.5 |
100 |
50 |
0.01 |
56(50-62) |
110 |
| 05D680K |
40 |
56 |
1.8 |
100 |
50 |
0.01 |
68(61-75) |
135 |
| 05D820K |
50 |
65 |
2.8 |
400 |
200 |
0.1 |
82(74-90) |
135 |
| 05D101K |
60 |
85 |
2.8 |
400 |
200 |
0.1 |
100(90-110) |
165 |
| 05D121K |
75 |
100 |
4.2 |
400 |
200 |
0.1 |
120(108-132) |
200 |
| 05D151K |
95 |
125 |
4.2 |
400 |
200 |
0.1 |
150(135-165) |
250 |
| 05D181K |
115 |
150 |
5.6 |
400 |
200 |
0.1 |
180(162-198) |
300 |
| 05D201K |
130 |
170 |
7.7 |
400 |
200 |
0.1 |
220(180-220) |
330 |
| 05D221K |
140 |
180 |
8.8 |
400 |
200 |
0.1 |
220(198-242) |
360 |
| 05D241K |
150 |
200 |
9.9 |
400 |
200 |
0.1 |
240(216-264) |
395 |
| 05D271K |
175 |
225 |
10.2 |
400 |
200 |
0.1 |
270(243-297) |
455 |
| 05D301K |
190 |
250 |
11.8 |
400 |
200 |
0.1 |
3OO(270-330) |
505 |
| 05D331K |
210 |
275 |
14 |
400 |
200 |
0.1 |
330(297-363) |
550 |
| 05D361K |
230 |
300 |
14 |
400 |
200 |
0.1 |
360(324-396) |
595 |
| 05D391K |
250 |
320 |
15.4 |
400 |
200 |
0.1 |
390(351-429) |
650 |
| 05D431K |
275 |
350 |
16.8 |
400 |
200 |
0.1 |
430(387-473) |
710 |
| 05D471K |
300 |
385 |
18.2 |
400 |
200 |
0.1 |
470(423-517) |
775 |
| 05D511K |
320 |
415 |
19.6 |
400 |
200 |
0.1 |
510(459-561) |
845 |
| 05D561K |
350 |
460 |
19.6 |
400 |
200 |
0.1 |
560(504-616) |
920 |
| 05D621K |
385 |
505 |
21 |
400 |
200 |
0.1 |
620(558-682) |
1025 |
| 05D681K |
420 |
560 |
21 |
400 |
200 |
0.1 |
680(612-748) |
1120 |
| 05D751K |
460 |
615 |
22.4 |
400 |
200 |
0.1 |
750(675-825) |
1240 |
|