##  [Single‑Event Latch‑Up (SEL)](/single-event-latch-sel) 

  ##  [Single‑Event Latch‑Up (SEL)](https://engineering.quantumdictionary.io/single-event-latch-sel-0) 

  

 [![Engineering & Applied Technologies Dictionary](/sites/default/files/styles/large/public/2026-01/Engineering%20%26%20Applied%20Technologies.png.webp?itok=_IKO7_-n)](/topic-specific-dictionaries/engineering-applied-technologies)



**Engineering & Applied Technologies Dictionary**

 







 

 

 

 



 

 

 

 

Definition

A radiation‑triggered condition in a semiconductor device where a parasitic thyristor (PNPN) structure is activated, producing a self‑sustaining, high‑current conduction path between supply rails; without prompt current removal or limiting this can cause thermal damage or permanent failure.