Each Darlington could be replaced by a respective MOSFET.could two MOSFETs replace the Darlington?
Essentially yes (though you might be lucky with 6V). According to the datasheet it may need a gate voltage,Vgs, as much as 4V just to get a drain current of 250uA! With Vgs = 10V the Rds is 0.4Ω, which is relatively high by today's standards and means the FET would be dissipating 0.4 x 5 = 2W minimum. With Vgs only 6V the Rds and power wastage would be greater.Does this mean: it needs a high Gate voltage (potential) (10V not 6V) to create the Field required
Look for FETs with a lower Rds(on) rating (e.g. IRL1404, IRFZ44N). The Rds(on) ratings usually are for Vgs = 10V.
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