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This is the datasheet of the APD I got.

Photodiode Datasheet

There's 'I_R' at test condition for breakdown voltage.

What is this current I_R?

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  • \$\begingroup\$ A quick Google yielded a good result. When the device avalanches, you want to limit the current otherwise the device might melt down. \$\endgroup\$
    – Kartman
    Nov 23 at 11:52
  • \$\begingroup\$ I think it is probably the reverse current at the breakdown voltage. The plot of current vs voltage during breakdown has a very steep slope but is not vertical, so perhaps they are defining the reverse current threshold for the start of break down. \$\endgroup\$ Nov 23 at 17:14
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The comments are valid- It's how they define the breakdown voltage. The reverse voltage at which 2 uA of current flows.

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