S-8521D33MC-BXST2U

Overview

The S-8521D33MC-BXST2U is a synchronous buck DC-DC switching controller manufactured by ABLIC Inc. It operates within a supply voltage range of 2.5 V to 16 V and delivers a fixed 3.3 V output. The device features an adjustable switching frequency up to 60 kHz and supports a maximum duty cycle of 100%. Designed for surface-mount installation, it utilizes the SOT-23-5 package (SC-74A/SOT-753). The component functions reliably across an ambient temperature range of -40°C to +85°C and includes enable control functionality.

Feature Summary

• Synchronous rectification architecture for improved efficiency
• Fixed 3.3 V output voltage regulation
• Wide input voltage operating range from 2.5 V to 16 V
• Enable pin control for power management

Applications

• Battery-powered portable electronic devices
• Embedded systems requiring stable 3.3 V logic supplies
• Industrial control modules with wide input variations
• Consumer electronics with space-constrained PCB layouts

Procurement Notes

Verify the specific suffix BXST2U against official ABLIC documentation to confirm package type and tape-and-reel specifications. Ensure compatibility with standard SOT-23-5 footprint designs. Confirm RoHS compliance status through current manufacturer declarations before integration into regulated products.

Selection Notes

Select this component when a compact synchronous buck solution is required for inputs up to 16 V. The 60 kHz frequency allows for smaller external inductors compared to lower-frequency alternatives. Verify that the load current requirements do not exceed the internal switch capabilities defined in the electrical characteristics table of the datasheet.

Part Context

This part belongs to the S-8521 series of synchronous buck controllers from ABLIC. The series is characterized by high efficiency and low standby current, making it suitable for battery-operated applications. The S-8521 family provides various output voltage options and packaging configurations to support diverse system design needs.

Replacement Considerations

Direct replacements include other ABLIC S-8521 variants with compatible output voltages and packages. Cross-brand substitutes must match the 3.3 V output, 16 V max input, and SOT-23-5 footprint while supporting synchronous operation.