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压敏电阻是一种限压型保护器件。利用压敏电阻的非线性特性,当过电压出现在压敏电阻的两极间,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。压敏电阻的主要参数有:压敏电压、通流容量、结电容、响应时间等。
压敏电阻的响应时间为ns级,比空气放电管快,比TVS管稍慢一些,一般情况下用于电子电路的过电压保护其响应速度可以满足要求。压敏电阻的结电容一般在几百到几千Pf的数量级范围,很多情况下不宜直接应用在高频信号线路的保护中,应用在交流电路的保护中时,因为其结电容较大会增加漏电流,在设计防护电路时需要充分考虑。压敏电阻的通流容量较大,但比气体放电管小。
压敏电阻的最大特点是当加在它上面的电压低于它的阀值"UN"时,流过它的电流极小,相当于一只关死的阀门,当电压超过UN时,它的阻值变小,这样就使得流过它的电流激增而对其他电路的影响变化不大从而减小过电压对后续敏感电路的影响。利用这一功能,可以抑制电路中经常出现的异常过电压,保护电路免受过电压的损害。 贴片压敏电阻由于其体积小,越来越广泛应用于一些手持设备和小型化的电子设备。
1.片式压敏电阻应用范围:
·保护元件和电路,防止在电源供应、控制和信号线产生的ESD
·为ICCMOS和MOSFET提供线上过压保护。
·在许多领域中可代替表面贴装TVS齐纳二极管
·用于协助各种终端产品实现电磁兼容
2.贴片压敏电阻具体应用:
·笔记本电脑、数码相机、掌上电脑、手机、MP3、主板、路由器 、汽车电子、液晶模块、网络电话、麦克风耳机等
3.SMD压敏电阻外型结构和尺寸:(mm)
规格 |
外形尺寸(mm) |
||||
英制 | 公制 | L | W | T | M |
0402 | 1005 | 1.0 ± 0.10 | 0.5 ± 0.10 | 0.5 ± 0.20 | 0.30+0.2/-0.1 |
0603 | 1608 | 1.6 ±0.15 | 0.8 ±0.10 | 0.8 ± 0.20 | 0.30+0.2/-0.1 |
0805 | 2012 | 2.0 ± 0.20 | 1.25 ±0.15 | 0.8 ± 0.20 | 0.30+0.2/-0.1 |
1206 | 3216 | 3.2 ± 0.20 | 1.6 ± 0.15 | 1.2 ± 0.20 | 0.40+0.2/-0.2 |
1210 | 3225 | 3.2 ± 0.20 | 2.5 ± 0.20 | 1.2 ± 0.20 | 0.40+0.2/-0.1 |
1812 | 4532 | 4.5 ± 0.20 | 3.20 ±0.20 | 1.3 ± 0.20 | 0.50+0.2/-0.1 |
2220 | 5650 | 5.7 ± 0.20 | 5.00 ±0.20 | 1.5 ± 0.20 | 0.80+0.2/-0.1 |
3220 | 08CL | 8.0 ± 0.20 | 5.00 ±0.20 | 2.0 ± 0.20 | 0.80+0.2/-0.1 |
3225 | 08CL | 8.0 ± 0.30 | 6.30 ±0.30 | 2.0 ± 0.20 | 0.70+0.2/-0.1 |
4032 | 10CL | 10.0 ± 0.20 | 8.00 ±0.20 | 2.0 ± 0.20 | 0.80+0.2/-0.1 |
4840 | 12CL | 12.0 ± 0.20 | 10.00 ±0.20 | 2.5 ± 0.20 | 0.80+0.2/-0.1 |
4.SMD0402-SMD1812贴片压敏电阻主要技术参数:
型号 |
工作电压 | 压敏电压 | 最大限制电压 | 流通量 | 最大能量 | ||
Vac | Vdc | V1mA(V) |
Vc(V) |
Ip(A) | Et(J) | ||
最小值 | 最大值 |
8/20μs 1A |
8/20μs | 10/1000μs | |||
SMD0402G3R3NXT | 2.5 | 3.3 | 4.0 | 6.0 | 10 | 10 | 0.02 |
SMD0402G5R0NXT | 3.5 | 5.0 | 6.0 | 9.0 | 14 | 10 | 0.02 |
SMD0402G5R6NXT | 4.0 | 5.6 | 6.7 | 10.1 | 15.5 | 10 | 0.02 |
SMD0402G8R0NXT | 5.7 | 8.0 | 9.6 | 14.4 | 21.5 | 10 | 0.05 |
SMD0402G9R0NXT | 6.0 | 9.0 | 10.8 | 16.2 | 25 | 10 | 0.05 |
SMD0402G110NXT | 8.0 | 11 | 13.2 | 16.5 | 30 | 10 | 0.05 |
SMD0402G120NXT | 9.0 | 12 | 14.4 | 18.0 | 32 | 10 | 0.05 |
SMD0402G140NXT | 10 | 14 | 16.8 | 21.0 | 40 | 10 | 0.05 |
SMD0405G180NXT | 14 | 18 | 21.6 | 27.0 | 54 | 10 | 0.05 |
SMD0405G220NXT | 17 | 22 | 26.4 | 33.0 | 62 | 10 | 0.05 |
SMD0402G260NXT | 20 | 26 | 31.2 | 39.0 | 72 | 10 | 0.05 |
SMD0402G300NXT | 25 | 30 | 36.0 | 45.0 | 85 | 10 | 0.05 |
SMD0402G380NXT | 30 | 38 | 45.6 | 57.0 | 101 | 10 | 0.05 |
SMD0603G3R0NXT | 2.2 | 3.0 | 3.6 | 5.4 | 10 | 20 | 0.05 |
SMD0603G3R3NXT | 2.5 | 3.3 | 4.0 | 6.0 | 10 | 20 | 0.05 |
SMD0603G5R0NXT | 3.5 | 5.0 | 6.0 | 9.0 | 14 | 30 | 0.1 |
SMD0603G5R6NXT | 4.0 | 5.6 | 6.7 | 10.1 | 15.5 | 30 | 0.1 |
SMD0603G8R0NXT | 5.7 | 8.0 | 9.6 | 14.4 | 21.5 | 30 | 0.1 |
SMD0603G9R0NXT | 6.0 | 9.0 | 10.8 | 16.2 | 25 | 30 | 0.1 |
SMD0603G110NXT | 8.0 | 11.0 | 13.2 | 16.5 | 30 | 30 | 0.1 |
SMD0603G120NXT | 9.0 | 12.0 | 14.4 | 18.0 | 32 | 30 | 0.1 |
SMD0603G140NXT | 10.0 | 14.0 | 16.8 | 21.0 | 40 | 30 | 0.1 |
SMD0603G150NXT | 12.0 | 15.0 | 18.0 | 22.5 | 42 | 30 | 0.1 |
SMD0603G160NXT | 12.0 | 16.0 | 19.2 | 24.0 | 46 | 30 | 0.1 |
SMD0603G180NXT | 14.0 | 18.0 | 21.6 | 27.0 | 54 | 30 | 0.1 |
SMD0603G220NXT | 15.0 | 22.0 | 26.4 | 33.0 | 62 | 30 | 0.1 |
SMD0603G260NXT | 20.0 | 26.0 | 31.2 | 39.0 | 72 | 30 | 0.1 |
SMD0603G280NXT | 21.0 | 28.0 | 33.6 | 42.0 | 78 | 30 | 0.1 |
SMD0603G300NXT | 25.0 | 30.0 | 36.0 | 45.0 | 85 | 30 | 0.1 |
SMD0603G380NXT | 30.0 | 38.0 | 45.6 | 57.0 | 101 | 30 | 0.1 |
SMD0603G450NXT | 35.0 | 45.0 | 54.0 | 63.0 | 120 | 30 | 0.1 |
SMD0805G3R0NXT | 2.2 | 3.0 | 3.6 | 5.4 | 10 | 40 | 0.1 |
SMD0805G3R3NXT | 2.5 | 3.3 | 4.0 | 6.0 | 10 | 40 | 0.1 |
SMD0805G5R0NXT | 3.5 | 5.0 | 6.0 | 9.0 | 14 | 40 | 0.1 |
SMD0805G5R6NXT | 4.0 | 5.6 | 6.7 | 10.0 | 15.5 | 40 | 0.1 |
SMD0805G8R0NXT | 5.7 | 8.0 | 9.6 | 14.4 | 21.5 | 40 | 0.1 |
SMD0805G9R0NXT | 6.0 | 9.0 | 10.8 | 16.2 | 25 | 40 | 0.1 |
SMD0805G110NXT | 8.0 | 11.0 | 13.2 | 16.5 | 30 | 40 | 0.1 |
SMD0805G120NXT | 9.0 | 12.0 | 14.4 | 18.0 | 32 | 40 | 0.1 |
SMD0805G140NXT | 10.0 | 14.0 | 16.8 | 21.0 | 40 | 40 | 0.1 |
SMD0805G160NXT | 12.0 | 16.0 | 18.0 | 22.5 | 45 | 40 | 0.1 |
SMD0805G180NXT | 14.0 | 18.0 | 21.6 | 27.0 | 54 | 40 | 0.1 |
SMD0805G220NXT | 15.0 | 22.0 | 26.4 | 33.0 | 62 | 40 | 0.1 |
SMD0805G260NXT | 20.0 | 26.0 | 31.2 | 39.0 | 73 | 40 | 0.1 |
SMD0805G280NXT | 21.0 | 28.0 | 33.6 | 42.0 | 78 | 40 | 0.1 |
SMD0805G300NXT | 25.0 | 30.0 | 36.0 | 45.0 | 85 | 40 | 0.1 |
SMD0805G330NXT | 27.5 | 33.0 | 39.6 | 49.5 | 87.5 | 40 | 0.1 |
SMD0805G350NXT | 29.0 | 35.0 | 42.0 | 52.5 | 93 | 40 | 0.1 |
SMD0805G380NXT | 30.0 | 38.0 | 45.6 | 57.0 | 101 | 40 | 0.1 |
SMD0805G390NXT | 30.0 | 39.0 | 46.8 | 58.5 | 105 | 40 | 0.1 |
SMD0805G420NXT | 32.0 | 42.0 | 50.4 | 63.0 | 111 | 40 | 0.1 |
SMD0805G450NXT | 35.0 | 45.0 | 54.0 | 67.5 | 120 | 40 | 0.1 |
SMD0805G480NXT | 37.0 | 48.0 | 57.6 | 72.0 | 127 | 40 | 0.1 |
SMD0805G560NXT | 40.0 | 56.0 | 67.2 | 84.0 | 150 | 40 | 0.1 |
SMD0805G600NXT | 43.0 | 60.0 | 72.0 | 90.0 | 160 | 40 | 0.1 |
SMD1206G3R3NXT | 2.0 | 3.3 | 4.0 | 6.0 | 10 | 100 | 0.2 |
SMD1206G3R5NXT | 2.0 | 3.5 | 4.2 | 6.3 | 9.3 | 100 | 0.2 |
SMD1206G3R6NXT | 2.0 | 3.6 | 4.3 | 6.5 | 9.5 | 100 | 0.2 |
SMD1206G5R0NXT | 3.5 | 5.0 | 6.0 | 9.0 | 14.0 | 100 | 0.2 |
SMD1206G5R5NXT | 3.5 | 5.5 | 6.6 | 9.9 | 14.5 | 100 | 0.2 |
SMD1206G5R6NXT | 4.0 | 5.6 | 6.7 | 10.1 | 15.5 | 100 | 0.2 |
SMD1206G8R0NXT | 5.7 | 8.0 | 9.6 | 14.4 | 21.5 | 100 | 0.2 |
SMD1206G9R0NXT | 6.0 | 9.0 | 10.8 | 16.2 | 25 | 100 | 0.2 |
SMD1206G110NXT | 8.0 | 11.0 | 13.2 | 16.5 | 30 | 100 | 0.2 |
SMD1206G120NXT | 8.6 | 12.0 | 14.4 | 18.0 | 32 | 100 | 0.2 |
SMD1206G140NXT | 11.0 | 14.0 | 16.8 | 21.0 | 40 | 100 | 0.2 |
SMD1206G180NXT | 14.0 | 18.0 | 21.6 | 27.0 | 51 | 100 | 0.2 |
SMD1206G200NXT | 16.0 | 20.0 | 24,0 | 30.0 | 53 | 100 | 0.2 |
SMD1206G220NXT | 17.0 | 22.0 | 26.4 | 33.0 | 62 | 100 | 0.2 |
SMD1206G240NXT | 18.0 | 24.0 | 28.8 | 36.0 | 67 | 100 | 0.2 |
SMD1206G250NXT | 19.0 | 25.0 | 30.0 | 37.5 | 69 | 100 | 0.2 |
SMD1206G260NXT | 20.0 | 26.0 | 31.2 | 39.0 | 73 | 100 | 0.2 |
SMD1206G280NXT | 21.0 | 28.0 | 33.6 | 42.0 | 78 | 100 | 0.2 |
SMD1206G300NXT | 25.0 | 30.0 | 36.0 | 45.0 | 85 | 100 | 0.2 |
SMD1206G330NXT | 27.5 | 33.0 | 39.6 | 49.5 | 88 | 100 | 0.2 |
SMD1206G350NXT | 29.0 | 35.0 | 42.0 | 52.5 | 93 | 100 | 0.2 |
SMD1206G360NXT | 29.5 | 36.0 | 43.2 | 54.0 | 96 | 100 | 0.2 |
SMD1206G380NXT | 30.0 | 38.0 | 45.6 | 57.0 | 101 | 100 | 0.2 |
SMD1206G390NXT | 30.0 | 39.0 | 46.8 | 58.5 | 105 | 100 | 0.2 |
SMD1206G420NXT | 32.0 | 42.0 | 50.4 | 63.0 | 111 | 100 | 0.2 |
SMD1206G450NXT | 35.0 | 45.0 | 54.0 | 67.5 | 122 | 100 | 0.2 |
SMD1206G480NXT | 37.0 | 48.0 | 57.6 | 72.0 | 128 | 100 | 0.2 |
SMD1206G500NXT | 38.0 | 50.0 | 60.0 | 75.0 | 135 | 100 | 0.2 |
SMD1206G560NXT | 40.0 | 56.0 | 67.2 | 84.0 | 150 | 100 | 0.2 |
SMD1206G600NXT | 43.0 | 60.0 | 72.0 | 90.0 | 160 | 100 | 0.2 |
SMD1206G650NXT | 47.0 | 65.0 | 78.0 | 117.0 | 172 | 100 | 0.2 |
SMD1206G680NXT | 49.0 | 68.0 | 81.6 | 102.0 | 180 | 100 | 0.2 |
SMD1206G750NXT | 50.0 | 75.0 | 90.0 | 112.5 | 200 | 100 | 0.2 |
SMD1206G850NXT | 60.0 | 85.0 | 102.0 | 127.5 | 225 | 100 | 0.2 |
SMD1206G101NXT | 67.0 | 100.0 | 120.0 | 150.0 | 265 | 100 | 0.2 |
SMD1210G5R6NXT | 4.0 | 5.6 | 6.7 | 10.1 | 15.5 | 250 | 1.5 |
SMD1210G8R0NXT | 5.7 | 8.0 | 9.6 | 14.4 | 21.5 | 250 | 1.5 |
SMD1210G130NXT | 10.0 | 13.0 | 15.6 | 19.5 | 35 | 250 | 1.5 |
SMD1210G140NXT | 11.0 | 14.0 | 16.8 | 21.0 | 40 | 250 | 1.5 |
SMD1210G160NXT | 13.0 | 16.0 | 19.2 | 24.0 | 43 | 250 | 1.5 |
SMD1210G180NXT | 14.0 | 18.0 | 21.6 | 27.0 | 51 | 250 | 1.5 |
SMD1210G200NXT | 16.0 | 20.0 | 24.0 | 30.0 | 55 | 250 | 1.5 |
SMD1210G220NXT | 17.0 | 22.0 | 26.4 | 33.0 | 62 | 250 | 1.5 |
SMD1210G250NXT | 19.3 | 25.0 | 30.0 | 37.5 | 67 | 250 | 1.5 |
SMD1210G260NXT | 20.0 | 26.0 | 31.2 | 39.0 | 73 | 250 | 1.5 |
SMD1210G270NXT | 20.0 | 27.0 | 32.4 | 40.5 | 75 | 250 | 1.5 |
SMD1210G280NXT | 21.0 | 28.0 | 33.6 | 39.0 | 78 | 250 | 1.5 |
SMD1210G300NXT | 25.0 | 30.0 | 36.0 | 45.0 | 85 | 250 | 1.5 |
SMD1210G330NXT | 27.5 | 33.0 | 39.6 | 49.5 | 88 | 250 | 1.5 |
SMD1210G350NXT | 29.0 | 35.0 | 42.0 | 52.5 | 93 | 250 | 1.5 |
SMD1210G380NXT | 30.0 | 38.0 | 45.6 | 57.0 | 101 | 250 | 1.5 |
SMD1210G400NXT | 30.0 | 40.0 | 48.0 | 60.0 | 105 | 250 | 1.5 |
SMD1210G420NXT | 32.0 | 42.0 | 54.0 | 63.0 | 111 | 250 | 1.5 |
SMD1210G440NXT | 33.0 | 44.0 | 52.8 | 66.0 | 117 | 250 | 1.5 |
SMD1210G450NXT | 35.0 | 45.0 | 54.0 | 67.5 | 125 | 250 | 1.5 |
SMD1210G470NXT | 36.5 | 47.0 | 56.4 | 70.5 | 126 | 250 | 1.5 |
SMD1210G480NXT | 37.0 | 48.0 | 57.6 | 72.0 | 128 | 250 | 1.5 |
SMD1210G500NXT | 38.0 | 50.0 | 60.0 | 75.0 | 135 | 250 | 1.5 |
SMD1210G560NXT | 40.0 | 56.0 | 67.2 | 84.0 | 150 | 250 | 1.5 |
SMD1210G600NXT | 43.0 | 60.0 | 72.0 | 90.0 | 160 | 250 | 1.5 |
SMD1210G650NXT | 47.0 | 65.0 | 78.0 | 97.5 | 172 | 250 | 1.5 |
SMD1210G750NXT | 50.0 | 75.0 | 90.0 | 112.5 | 200 | 250 | 1.5 |