西瑪可控硅晶閘管N1663CH35 N3839TC350
（1）S3900MF的VTR<0.8V，宜選R×1檔測量。
（2）若再用讀取電流法求出ITR值，還可以繪制反向伏安特性。
①一般小功率晶閘管不需加散熱片，但應遠離發(fā)熱元件，如大功率電阻、大功率三極管以及電源變壓器等。對于大功率晶閘管，必須按手冊申的要求加裝散熱裝置及冷卻條件，管子工作時的溫度不超過結(jié)溫。
②晶閘管在使用中發(fā)生超越和短路現(xiàn)象時，會引發(fā)過電流將管子燒毀。對于過電流，一般可在交流電源中加裝快速保險絲加以保護。快速保險絲的熔斷時間極短，一般保險絲的額定電流用晶閘管額定平均電流的1.5倍來選擇。
③交流電源在接通與斷開時，有可能在晶閘管的導通或阻斷對出現(xiàn)過壓現(xiàn)象，將管子擊穿。對于過電壓，可采用并聯(lián)RC吸收電路的方法。因為電容兩端的電壓不能突變，所以只要在晶閘管的陰極及陽極間并取RC電路，就可以削弱電源瞬間出現(xiàn)的過電壓，起到保護晶閘管的作用。當然也可以采用壓敏電阻過壓保護元件進行過壓保護。
如何保護晶閘管編輯
N850CH36
N2418ZC360
N880CH24
N2543ZC240
N880CH26
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N880CH28
N2543ZC280
N880CH30
N2543ZC300
N900CH20
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N1663CH30
N3839TC300
N1663CH32
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N1863CH20
N4400TC200
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N4400TC220
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N4400TC280
N1483CH36
N4151FC360
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N5177FC260
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N5177FC280
N1983CH18
N5946FC180
N1983CH20
N5946FC200
N1983CH22
N5946FC220
R210SH10
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R190SH10
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R200SH16
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R0878lS16M
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R219SH08
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D315CH32
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R305SH14
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D350SH24
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R350SH08
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R1178NS14E
R1178NS10F R1178NS10G
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R355SH08
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R355SH12
R1271NS12D
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R1271NS12E R1271NS12G
R395SH14
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R395SH20
R1275NS14M
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R1275NS16M
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D391SH22
R1279NS22J
D391SH24
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D391SH25
R1279NS25J
R1279NS22K R1279NS24K
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R1279NS22M
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D390SH18
R1280NS18J
D390SH20
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D390SH25
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R1280NS18K R1280NS18M
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D450SH10
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R400SH08
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R500CH20
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