# Phototransistor Failure Analysis


Phototransistors amplify the current generated by the light striking the active area. Compared to photodiodes, a large output current can be obtained, even from a small active area.


## Pages

- [Photocoupler Avago HCPL 0630 Failure Analysis](https://gideonlabs.com/posts/photocoupler-failure-analysis/index.md)
- [Photocoupler Vishay IL420 Failure Analysis](https://gideonlabs.com/posts/photocoupler-failure-analysis-2/index.md)
- [Phototransistor Failure](https://gideonlabs.com/posts/phototransistor-failure/index.md)
- [Optocoupler Failures](https://gideonlabs.com/posts/optocoupler-failures/index.md)