BU4928F-TR

Supervisors Overview

The BU4928F-TR is a low voltage standard CMOS voltage detector IC manufactured by ROHM Semiconductor. It features a fixed under-voltage detection threshold of 2.8 V with a precision of ±1%. The device operates within a supply voltage range of 0.7 V to 7 V and supports an operating temperature range from -40°C to +125°C. It utilizes a VSOF-5 package for surface mount installation. The circuit draws a typical operating current of 450 nA and includes hysteresis voltage defined as Vdet x 0.05. The reset output is active low with no manual reset or watchdog timer functionality.

Supervisors Feature Summary

• CMOS technology ensures ultra-low power consumption suitable for battery-operated systems
• Fixed threshold voltage provides reliable under-voltage monitoring without external components
• Integrated hysteresis prevents output oscillation during voltage transitions near the threshold

Supervisors Applications

• Portable electronic devices requiring low standby current
• Battery-powered equipment needing under-voltage protection
• Industrial control systems operating in wide temperature environments

Supervisors Procurement Notes

Verify the specific suffix TR indicates tape and reel packaging configuration. Confirm RoHS compliance status through official documentation. Check current lifecycle status as some variants may be not recommended for new designs. Ensure VSOF-5 footprint compatibility with PCB layout requirements before procurement.

Supervisors Selection Notes

Select this component when a fixed 2.8 V detection threshold is required. Consider the VSOF-5 package size constraints against available board space. Evaluate the 450 nA quiescent current against system power budgets. Verify that the open-drain CMOS output interface matches the downstream logic level requirements.

Supervisors Part Context

This part belongs to the BU49xx series of low voltage detectors from ROHM. It shares functional similarities with other members like BU4926F and BU4928G but differs in package type and specific threshold settings. The series is designed for general-purpose voltage supervision in compact electronic applications.

Supervisors Replacement Considerations

BD5228G-1 is listed as a similar level replacement with the same pinout and comparable specifications.