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What are rise time tr and fall time tf for an optocoupler?

Latest Updated:02/01/2008

Question:

What are rise time tr and fall time tf for an optocoupler?

Answer:

These parameters indicate the transient change time of the output voltage when a pulsating forward current (IF) flows into the light-emitting side and the output turns ON or OFF.

  1. tr: Time until the output voltage rises to the 90% level from 10%
  2. tf: Time until the output voltage falls to the 10% level from 90%


Suitable Products
Diodes for Constant Voltage
Photocouplers / Optocouplers