Our HTO test condtions for the qualification are 2000h at 100°C and 2 x Vop which is typically 2 x 2.0 V. Doing so, we apply Telcordia GR-468 Issue 2 Requirements. The underlying assumption for our test conditions are:
The dominant failure mechanism that will be observed for our PIN diodes is wearout failure and not random failure. Therefore, the test condition of 2000h at 175°C do not apply for our photodiodes. Please refer to Telcordia GR-468 Issue 2, Table 4-5, Note 2.
Telcordia GR-468 Issue 2 states in section 3.3.3 that the required test temperature for uncontrolled (UNC) environments is 85°C or the maximum specified operating temperature. We specify a maximal operating temperature of 85°C for our PIN diodes.
However, we take into consideration that most of our photodiodes are operated at higher temperature when they become part of a package which may run 85°C ambient temperature. Therefore, we test at 100°C.