一、陶瓷電容是什么

陶瓷電容是指用高(gao)(gao)介電(dian)(dian)(dian)常數的(de)電(dian)(dian)(dian)容(rong)(rong)(rong)器(qi)(qi)陶瓷(ci)(ci)(ci)鈦酸(suan)鋇一氧化(hua)鈦擠壓(ya)成(cheng)圓(yuan)管、圓(yuan)片(pian)或圓(yuan)盤作(zuo)(zuo)為(wei)(wei)介質(zhi)，并用燒(shao)滲法將銀鍍(du)在陶瓷(ci)(ci)(ci)上(shang)作(zuo)(zuo)為(wei)(wei)電(dian)(dian)(dian)極(ji)制成(cheng)。它又(you)分高(gao)(gao)頻(pin)(pin)瓷(ci)(ci)(ci)介和(he)低頻(pin)(pin)瓷(ci)(ci)(ci)介兩種。具有(you)小的(de)正電(dian)(dian)(dian)容(rong)(rong)(rong)溫度系數的(de)電(dian)(dian)(dian)容(rong)(rong)(rong)器(qi)(qi)，用于(yu)高(gao)(gao)穩(wen)定振(zhen)蕩回(hui)路(lu)中，作(zuo)(zuo)為(wei)(wei)回(hui)路(lu)電(dian)(dian)(dian)容(rong)(rong)(rong)器(qi)(qi)及墊整電(dian)(dian)(dian)容(rong)(rong)(rong)器(qi)(qi)。低頻(pin)(pin)瓷(ci)(ci)(ci)介電(dian)(dian)(dian)容(rong)(rong)(rong)器(qi)(qi)限(xian)于(yu)在工作(zuo)(zuo)頻(pin)(pin)率較低的(de)回(hui)路(lu)中作(zuo)(zuo)旁(pang)路(lu)或隔直流(liu)用，或對穩(wen)定性和(he)損耗要求不(bu)高(gao)(gao)的(de)場合(包(bao)括高(gao)(gao)頻(pin)(pin)在內)。這種電(dian)(dian)(dian)容(rong)(rong)(rong)器(qi)(qi)不(bu)宜使用在脈(mo)(mo)沖電(dian)(dian)(dian)路(lu)中，因為(wei)(wei)它們易于(yu)被脈(mo)(mo)沖電(dian)(dian)(dian)壓(ya)擊(ji)穿(chuan)。

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二、瓷片電容怎么分類

1、按介質材料可分為：高(gao)介電(dian)(dian)常數電(dian)(dian)容(rong)器(qi)和低介電(dian)(dian)常數電(dian)(dian)容(rong)器(qi)。

2、按工作(zuo)頻率可(ke)分為：高頻瓷(ci)介電(dian)容器和低(di)頻瓷(ci)介電(dian)容器。

3、按工作電壓可分為：高壓(ya)瓷(ci)(ci)介(jie)電容器（1KVDC以上(shang)）和低壓(ya)瓷(ci)(ci)介(jie)電容器（500VDC以下）。

4、按外(wai)形結構(gou)可分為：圓(yuan)片形、管形、穿心式、筒形以(yi)及疊片式等。

5、按瓷(ci)(ci)(ci)介(jie)(jie)電容(rong)(rong)電介(jie)(jie)質又(you)分：I類瓷(ci)(ci)(ci)介(jie)(jie)電容(rong)(rong)、II類瓷(ci)(ci)(ci)介(jie)(jie)電容(rong)(rong)、III類瓷(ci)(ci)(ci)介(jie)(jie)電容(rong)(rong)。

I類瓷介(jie)電(dian)容：NP0，SL0，C0G。I類瓷介(jie)電(dian)容容量(liang)穩定性很好，基本不隨溫度，電(dian)壓，時間等變化(hua)而(er)變化(hua)，但是一般容量(liang)都很小。

II類(lei)瓷介電容(rong)：X7R，X5R，Y5U，Y5V，2X1。II類(lei)瓷介電容(rong)容(rong)量穩(wen)(wen)定(ding)性很差，隨(sui)著溫度(du)，電壓，時間變化幅(fu)度(du)較大，所以一般(ban)用在對(dui)容(rong)量穩(wen)(wen)定(ding)性要求不高的場(chang)合(he)，如(ru)濾(lv)波等。

III類瓷介(jie)電(dian)容：Y5V，2F4，瓷介(jie)電(dian)容器EIA RS-198。