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The ST device is a Type-C controller with USB PD while the TUSB320I is a Type-C controller. In regards to pricing, I do not see anything wrong after checking the different sites. Could you point me to where you obtained pricing. I would actually suggest to use the TUSB320LAI which is our latest gen.
Do you need USB PD for your application? If so, then I would suggest the TUSB422.
