Marking code search for "I", search I found 3 records.

Marking of electronic components, SMD Codes I, I**. P4SMAJ24A, SMAJ24A, MAX6315US50D4, ic marking code.

PartNumber	Marking code	Manufacturer	Package
P4SMAJ24A	IZ	Pjt,Srj	DO-214AC/SMA
SMAJ24A	IZ	Di	DO-214AC/SMA
MAX6315US50D4	IZxx		SOT143