As far as I can see from the OnSemi datasheet, the MC33063ADR2G and MC34063ADR2G are totally identical except for the specified temperature range (-40 to +85degC vs 0 to +70degC).
Does anyone know of any physical difference between them, such as altered package construction or materials?
Are the the 33063 devices actually tested at the -40 and +85degC temperature extremes, or is the difference purely a way of promoting the device for different market segments (with appropriate cost adjustments)?
John