【应用】符合RoHS标准的气体放电管SL1411A230C用在小基站上，最大冲击击穿电压@1k V/μs为650V

时间： 2022-12-14 来源：世强

技术问答

室外基站，因为有遭受雷击的风险，特别是对内部的电子元器件能够造成毁灭性伤害。如下是关于RS485接口的一种典型保护电路，需求一颗气体放电管（GDT），来防止通常由雷电干扰引起的快速上升瞬态，要求GDT能耐受10kA的脉冲放电和600V的击穿电压。

据此给客户推荐了LITTELFUSE（力特）的SL1411A，此系列的特征为：

无铅，符合RoHS标准；
低插入损耗；
对快速上升的瞬变有极好的响应；
超低电容用8/20测试5kA（SL1011A）或10kA（SL1411A）浪涌能力μIEC 61000-4-5第2版定义的s脉冲。

根据客户实际要求，以及参考规格书的料号编码原则，选型的具体型号为SL1411A230C，其主要参数如下：

由上述特征描述和上表可以看出，SL1411A230C的参数完全满足客户要求：最大冲击击穿电压@1k V/μs为650V，满足600V要求，脉冲放电电流@8/20μs为10kA，能够很好的保护RS485接口免受雷击等浪涌的伤害。

另外要注意一个细节就是C型的尺寸如下，与A型的有所不同，关于焊接贴板的参数等可以参考规格书：

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