Opto-coupler for DIs

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phil99

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Joined: 11/02/2018
Location: Australia
Posts: 3148
Posted: 08:21am 24 Jun 2025      

  Quote   Current transfer ratio (CTR : MIN. 50% at IF=5 mA, VCE=5V)
So it appears the output load can be up to 2.5mA for a drive of 5mA.
If the supply on the output side is 3.3v and the load resistor is 3.3kΩ just 1mA can flow so it should be ok.

Edit.
Fig.6 Current Transfer Ratio vs. Forward Current shows best CTR @ If = 2.5mA.
Edited 2025-06-24 18:29 by phil99