ABLIC Inc. IC REG CTRLR BUCK SOT23-5 S-8521D40MC-BXZT2G

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The S-8521D40MC-BXZT2G is an electronic component, the details of which are currently unavailable as it appears to be a custom or proprietary part. No datasheet or specification for this specific model could be found online. It is possible that it may be a specialized component used in certain industries or applications.