ABLIC Inc. IC REG CTRLR BUCK SOT23-5 S-8520B35MC-ARUT2G

The S-8355M31MC-MCQT2U is a product model, possibly of an electronic device or component. Unfortunately, there's no specific information available about this model online as it doesn't match any known product. It's possible that the characters "MCQT2U" may indicate it's a part of a custom-built system or a proprietary product with limited public disclosure.