What is the difference between OpAmp AD8602 with AR and DRsuffix?
R refers to R-8 package option (8 ld SOIC). A and D refer to the device
electrical/temperature grade. Devices are sorted into different grades of the
same device at final test. The electrical specifications on page 2 and 3 of the
datasheet give the differences in specs between the A and D grades. The A grade
has the higher specification and so is the more expensive than the D grade.