Looking at the datasheet for MOC30xx (here: http://www.farnell.com/datasheets/1806097.pdf) I see the following note on p4 under the table outlining the respective LED Trigger Currents of the various models (my emphasis):
- All devices are guaranteed to trigger at an IF value less than or equal to max IFT. Therefore, recommended operating IF lies between max IFT (30 mA for MOC3020M, 15 mA for MOC3010M and MOC3021M, 10 mA for MOC3011M and MOC3022M, 5 mA for MOC3012M and MOC3023M) and absolute maximum IF (60 mA).
I can't get my head around why the IF has to be less than or equal than Max IFT. Is this a typo? "Should it be All devices are guaranteed to trigger at an IF value greater than or equal to max IFT"?
If so, does that imply the units with lower trigger currents are the more flexible and generic?
The prices for the components in this series are as similar, why not just produce the MOC3023 (which has the highest Off State Output Terminal Voltage and lowest LED Trigger current) and be done with it?