Why are they used?

Zener or Small Signal Diodes is general-purpose signal diode. This si a "reverse biased" diode blocks current in the reverse direction, but will suffer from premature breakdown or damage if the reverse voltage applied across it is too high.

Applications / How do you spot opportunities?

Varies applications of zener diode includes:
1. Voltage Regulators (in shunt mode),
2. Surge Suppressors .i.e. for device protection

All Application need Zener Diodes.

How to ask for opportunities?

Do you need Diodes for Voltage Regulation or Surge Suppression?

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