Optocoupler Breakdown voltage doubt

[themaccabee]

Hi ,

Can some one please tell me the why in the data sheet of an opto coupler MOCD207M from fairchild shows two break down voltage values for collector-emitter junction and what could it mean?
Page 3 Electrical characteristics, Detector Section
https://www.fairchildsemi.com/ds/MO/MOCD207M.pdf

One value is 70V while other is 7V..

Thanks for any help

Regards

 

[betwixt]

One is VCEO and the other is VECO, they are the maximum voltages in one direction and the other with the transistor not conducting.

Brian.

 

[crutschow]

The high voltage is with a positive collector-emitter voltage and the low voltage is with a negative collector-emitter voltage.