Hello! Tell me please, what`s the difference between LT3748EMS#PBF and LT3748IMS#PBF?
This is common question that can be found in other threads on other part generics. The answer is on Note 2 page 3 of datasheet.
The LT3748E is guaranteed to meet performance specifications from 0°C to 125°C junction temperature. Specifications over the –40°C to 125°C operating junction temperature range are assured by design characterization and correlation with statistical process controls. The LT3748I is guaranteed over the full –40°C to 125°C operating junction temperature range.