Need help indentifiying this smd

hello i need help identifying the attached picture of a smd, Ive spend a couple hours trying to track down a datasheet to try to figure out what this is i hope someone can help me track something down
the numbers on the component are as follows ST E
MR
c725

725 thanks in advance

Hello 725, You have SM6T30CA not stocking but take a look at 497-10800-1-ND stocking change is it is automotive grade. Thank you 725.

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Robert_1552 it is used on a pcb board from an industrial machine

hello and thanks for you help much appreciated