Be sure to click 'more' and select 'suggest as answer'!
If you're the thread creator, be sure to click 'more' then 'Verify as Answer'!
Do you know the MTTF of this element?
That appears to be a Taiwan Semiconductor 1N5404G. You'll have to enquire with them - it will very much be related to how you are operating the part (e.g. current/power dissipation, temperature).
- Gough
