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CTR of opto-coupler at low diode current (IF)?

Discussion in 'General Electronics Discussion' started by eem2am, Mar 1, 2011.

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  1. eem2am


    Aug 3, 2009

    Can i please confirm that even though the CNY17-2 opto-coupler has a stated CTR of 63% to 125%, .....this does not apply at all levels of diode current?

    For example ,Figure 5, page 5 appears to show that the CTR of CNY17-2 is just 30% at a diode current (IF) of 500uA ?

    So do you agree that at low diode currents, the stated "63% to 125%" CTR is meaningless?

  2. Laplace


    Apr 4, 2010
    The stated 63% to 125% CTR applies only to a single point on the graph in Figure 5. The graph shows that at If=10mA the CTR is 95%, but it could be as low as 63% or as high as 125%. The graph also shows that the CTR is significantly less at reduced diode current.
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