Help with datasheet

I am looking at NTE3100 Photon Coupled Interrupter Module datasheet. Emitter Forward Voltage VF IF = 60mA – – 1.7 V It shows 1.7V in the MAX column, they show no value in the MIN or TYP column. Do I use this information to calculate the current limiting resister? I found values on the internet of 2.5k and another shows 150 ohm both at 5VDC. What would be the proper way to use the datasheet to calculate for the resistor. Link to datasheet: http://www.nteinc.com/specs/3100to3199/pdf/nte3100.pdf

by DonFykes
December 27, 2017

50mA sounds a whole load of current. My approach would be to stick 10k in there at first and see how that works, reduce if necessary. If you are really pushed for speed lower values down to 100 ohms might work better. Both your internet values lie within this range. The reason only a max is given is that the min is zero-ish. To be safe, find a value which just works and then halve it. Hope that helps. mike

by mikerogerswsm
December 27, 2017

Mike, Thank you for your time. I will probably start with the 10k as you suggested. Thank you. Don

by DonFykes
December 28, 2017
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