半导体放电管主要用于信号保护。
工作原理
当电路电压过大，达到击穿电压那么大时，这是即使电压很小，但电路中电流很大，半导体继续工作。
应用范围
通讯传输，信号防雷器，如手机，电话机等。
半导体放电管的型号有:
| P0080SA | P1500SA | P0080EA | P1500EA |
| P0080SB | P1500SB | P0080EB | P1500EB |
| P0080SC | P1500SC | P0080EC | P1500EC |
| P0300SA | P1800SA | P0300EA | P1800EA |
| P0300SB | P1800SB | P0300EB | P1800EB |
| P0300SC | P1800SC | P0300EC | P1800EC |
| P0640SA | P2300SA | P0640EA | P2300EA |
| P0640SB | P2300SB | P0640EB | P2300EB |
| P0640SC | P2300SC | P0640EC | P2300EC |
| P0720SA | P2600SA | P0720EA | P2600EA |
| P0720SB | P2600SB | P0720EB | P2600EB |
| P0720SC | P2600SC | P0720EC | P2600EC |
| P0800SA | P3100SA | P0800EA | P3100EA |
| P0800SB | P3100SB | P0800EB | P3100EB |
| P0800SC | P3100SC | P0800EC | P3100EC |
| P1100SA | P3500SA | P1100EA | P3500EA |
| P1100SB | P3500SB | P1100EB | P3500EB |
| P1100SC | P3500SC | P1100EC | P3500EC |
| P1300SA | P4000SA | P1300EA | P4000EA |
| P1300SB | P4000SB | P1300EB | P4000EB |
| P1300SC | P4000SC | P1300EC | P4000EC |